Answer:
Balanced equation: 2Fe(OH)₃ → Fe₂O₃ + 3H₂O
a) 2.39 g
b) 1.78 g
Explanation:
Given unbalanced chemical equation:
Fe(OH)₃ → Fe₂O₃ + H₂O
To balance a chemical equation, we need to make sure that there are the same number of atoms of each element on both sides of the equation. We can do this by adding coefficients in front of a chemical symbol or formula where needed.
Therefore, the balanced equation is:
[tex]\large\boxed{\sf 2Fe(OH)_3 \rightarrow Fe_2O_3 + 3H_2O}[/tex]
[tex]\hrulefill[/tex]
Part (a)Given that 0.75 L of water vapor (H₂O) is produced at STP (Standard Temperature and Pressure), which is 273.15 K and 1 atm, we can calculate the number of moles of water vapor produced using the ideal gas law:
[tex]\large\boxed{PV = nRT}[/tex]
where:
P = 1 atm (pressure)V = 0.75 L (volume)n is the number of moles of H₂O we want to calculate.R is the ideal gas constant (0.082 L·atm/mol·K)T = 273.15 K (temperature at STP).Solving for n:
[tex]\begin{aligned}n &= \dfrac{PV}{RT}\\\\n&= \dfrac{1 \cdot 0.75}{0.082\cdot 273.15}\\\\n&\approx 0.0334846841 \;\rm mol\end{aligned}[/tex]
Therefore, the number of moles of water vapor produced is 0.0335 moles (3 s.f.).
Using the stoichiometric coefficients from the balanced equation, we can relate the moles of water vapor produced to the moles of iron (III) hydroxide (Fe(OH)₃) used.
From the balanced equation, 2 moles of Fe(OH)₃ produce 3 moles of H₂O. Therefore, the number of moles of Fe(OH)₃ is:
[tex]\phantom{w.}\rm 0.0334846841\; moles\;of\;H_2O \times \dfrac{2 \text{ moles of } Fe(OH)_3}{3 \text{ moles of } H_2O}\\\\ \approx 0.0223231227 \text{ moles of } Fe(OH)_3[/tex]
Now, calculate the molar mass of Fe(OH)₃:
[tex]\phantom{w.}\rm Molar\; mass\; of\; Fe(OH)_3\\\\=\rm (1 \times Atomic\; mass \;of\; Fe) + (3 \times Atomic\; mass\; of\; O) + (3 \times Atomic \;mass\; of \;H)\\\\\rm \approx (1 \times 55.845\;g/mol) + (3 \times 15.999\; g/mol) + (3 \times 1.008\;g/mol)\\\\\rm \approx 106.866\; g/mol[/tex]
Finally, calculate the mass of Fe(OH)₃ by multiplying the number of moles by the molar mass:
[tex]\begin{aligned}\rm Mass\; of\; Fe(OH)_3 &= \rm 0.0223231227 \; mol \times 106.866\; g/mol\\&= \rm 2.38558283\; g\\&\approx \rm 2.39\;g\;(3\;s.f.)\end{aligned}[/tex]
Therefore, approximately 2.39 grams of iron (III) hydroxide were used.
[tex]\hrulefill[/tex]
Part (b)From the balanced equation, 2 moles of Fe(OH)₃ produce 1 mole of Fe₂O₃. Therefore, the moles of Fe₂O₃ produced is:
[tex]\phantom{w.}0.0223231227 \text{ moles of } \rm Fe(OH)_3 \times \dfrac{1 \text{ mole of } Fe_2O_3}{2 \text{ moles of } Fe(OH)_3}\\\\ \approx 0.0111615614\text{ moles of } Fe_2O_3[/tex]
Now, calculate the molar mass of Fe₂O₃:
[tex]\phantom{w.}\rm Molar\; mass\; of\; Fe_2O_3\\\\=\rm (2 \times Atomic\; mass \;of\; Fe) + (3 \times Atomic\; mass\; of\; O) \\\\\rm \approx (2 \times 55.845\;g/mol) + (3 \times 15.999\; g/mol) \\\\\rm \approx 159.687\; g/mol[/tex]
Finally, calculate the mass of Fe₂O₃ by multiplying the number of moles by the molar mass:
[tex]\begin{aligned}\rm Mass\; of\; Fe_2O_3&= \rm 0.0111615614 \; mol \times 159.687\; g/mol\\&= \rm 1.78235625\; g\\&\approx \rm 1.78\;g\;(3\;s.f.)\end{aligned}[/tex]
Therefore, approximately 1.78 grams of iron (III) oxide were used.
A mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules at the same temperature and pressure have
different volumes.
the same number of molecules.
the same number of atoms.
different average kinetic energy per molecule.
A mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules at the same temperature and pressure have higher average kinetic energy per molecule.
At the same temperature and pressure, a mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules have the same number of molecules because a mole is defined as the amount of a substance that contains the same number of particles (Avogadro's number, approximately 6.022 x [tex]10^23[/tex]) regardless of the identity of the substance. The average kinetic energy per molecule is related to the temperature of the gas and the mass of the molecule. Therefore, a mole of oxygen molecules has a higher average kinetic energy per molecule than a mole of carbon dioxide molecules at the same temperature.
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Calcium carbonate decomposes at high temperatures to form carbon dioxide and calcium oxide.
CaCO3 --> CO2 + CaO (YOU MUST BALANCE FIRST)
Determine how many grams of calcium carbonate I will need to form 3.45L of carbon dioxide? Assume the pressure is 1atm and the temperature is 273K.
______ g CaCO3 (3 sig figs)
50 points
Given the volume of carbon dioxide is 3.45 L at a pressure of 1 atm and 273 K. Then, the number of moles of CO₂ is 0.154 moles. 0.154 moles of carbon dioxide gives 0.154 moles or 15.4 grams of calcium carbonate.
What is calcium carbonate ?Calcium carbonate is an ionic compound formed passing carbon dioxide gas through calcium oxide. As per the balanced reaction one mole of carbon dioxide and one mole of calcium oxide gives one mole of calcium carbonate.
Given, P = 1atm
v = 3.45 L for CO₂
T= 273 K
then use ideal gas equation to find the number of moles:
n = PV/RT
= 1 atm × 3.45 L/( 0.082 L atm/ K mol × 273 K) = 0.154 moles.
0.154 moles of CO₂ gives 0.154 moles of CaCO₃.
molar mass of CaCO₃ = 100 g/mol.
mass of 0.154 moles = 100 × 0.154 = 15.4 g.
Therefore, the mass of CaCO₃ formed will be 15.4 g.
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convert each of the following by dimensional analysis: for full credit show all steps
a. 2.25 litre into milliliters = 2250 milliliters.
b. 56.4 m to km = 90.767 kilometers
c. 125.7 cm into inch = 49.489 inch
What is unit conversion ?A unit conversion is the expression of the same property in a different unit of measurement. Time, for example, can be expressed in minutes rather than hours, and distance can be converted from miles to kilometers, feet, or any other length measurement.
Multiply the value in liters by the conversion factor '1000'. Then, 2.25 liters = 2.25 × 1000 = 2250 milliliters.
56.4 miles equal 90.7670016 kilometers.
125.7 centimeters = 49.49 inches. Formula is multiply the value in centimeters by the conversion factor.
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Your question is incomplete, complete question is attached below in image.
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?
A.) 130 mL of 0.440 M KCl
B.) 116 g of 0.220 m NaNO3
C.) 116 g of 1.7 % KCl solution by mass
D.) How much solvent would you take to prepare the solution in part B?
E.) How much solvent would you take to prepare the solution in part C?
To prepare the solution in part B, you would need 1360 mL of solvent.
To prepare the solution in part C, you would need 26.4 mL of solvent
How to prepare each of the following solutions from the dry solute and the solvent?A) To prepare 130 mL of a 0.440 M solution of KCl, you would need 0.440 M * 130 mL = 57.2 g of KCl.
B) To prepare 116 g of a 0.220 M solution of NaNO3, you would need 116 g / (85.01 g/mol) = 1.36 mol of NaNO3.
This would require 1.36 mol * 1000 mL/1 mol = 1360 mL of solvent.
C) To prepare 116 g of a 1.7% (by mass) KCl solution, you would need 116 g * (1.7 g/100 g) = 1.97 g of KCl.
This would require 1.97 g / (74.55 g/mol) = 0.0264 mol of KCl.
This would require 0.0264 mol * 1000 mL/1 mol = 26.4 mL of solvent.
D) To prepare the solution in part B, you would need 1360 mL of solvent.
E) To prepare the solution in part C, you would need 26.4 mL of solvent.
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which of the following is an example of a homogeneous mixture? select the correct answer below: A. oil and vinegar B. salad dressing C. chocolate chip cookie D. soil E. maple syrup
A good example of a homogenous mixture would be maple syrup. Option E.
What are homogenous mixtures?Homogeneous mixtures are gases, solids, or mixtures with uniform distribution of components. The components of homogeneous mixtures are uniformly dispersed within the mixtures.
Oil and vinegar don't mix and will therefore not form a uniform mixture.Salad dressings consist of different components but are usually not uniformly distributed.Chocolate chip cookies consist of different components that are not uniformly dispersed.Soil consists of different components but is also not uniformly dispersed.Maple syrup consists of sugar and water. Sugar is soluble in water, thus, forming a homogeneous mixture with water.
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In a very violent reaction called the thermite reaction, aluminum metal reacts with iron (III)oxide to form iron metal and aluminum oxide.Fe2O3 + AI → Fe + Al₂O₃What mass of aluminum will react 150 g of iron (III) oxide?
The mass of aluminum required to react with 150 g of iron (III) oxide is 75 g . This is calculated by using the following equation: mass of aluminum = (mass of iron (III) oxide / 2).
Therefore, 75 g of aluminum is required to react with 150 g of iron (III) oxide.
In the thermite reaction, a very exothermic reaction occurs when aluminum metal reacts with iron (III) oxide, producing iron metal and aluminum oxide. The reaction equation is as follows: Fe2O3 + AI → Fe + Al2O3. The reaction is highly exothermic, with a large amount of heat being released in the process.
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The colorless gas nitryl chloride (ClNO2) reacts with water to give a mixture of nitric acid and hydrochloric acid .
(a) Write a balanced chemical equation for this reaction.
(b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 5.82×10-2 moles of nitryl chloride with enough water to give a solution volume of 609 mL.
nitric acid : ?M
hydrochloric acid : ?M
(a) The balanced chemical equation for this reaction is:
ClNO2 + H2O → HCl + HNO3
(b)The concentrations of nitric acid and hydrochloric acid in the solution are both[tex]9.6 * 10^{-5} moles/L[/tex].
(a) The balanced chemical equation for this reaction is:
ClNO2 + H2O → HCl + HNO3
(b) The concentration of each acid in the solution can be calculated by using the equation:
moles acid = (moles reactant × mole ratio of acid) / solution volume
For nitric acid:
moles HNO3 = [tex]\frac{ (5.82 * 10^{-2 }moles ClNO2 * 1 mol HNO3 / 1 mol ClNO2) }{609 mL}[/tex]
moles HNO3 = [tex]9.6 * 10^{-5} moles/L[/tex]
For hydrochloric acid:
moles HCl =[tex]\frac{(5.82 * 10{-2} moles ClNO2 * 1 mol HCl / 1 mol ClNO2) }{ 609 mL}[/tex]
moles HCl =[tex]9.6 * 10^{-5} moles/L[/tex]
Therefore, the concentrations of nitric acid and hydrochloric acid in the solution are both[tex]9.6 * 10^{-5} moles/L[/tex]
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A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
Considering the Boyle's law, if the gas is compressed to a volume of 1.64 L, the pressure will be 6.714 atm.
Definition of Boyle's lawBoyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant. Boyle's Law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container: If the pressure increases, the volume decreases while if the pressure decreases, the volume increases.
The mathematical expression of this law is
P×V=k
where
P is the pressure.V is the volume.k is a constant.Being an initial state 1 and a final state 2, it is fulfilled:
P₁×V₁=P₂×V₂
Final pressure in this caseIn this case, you know:
P₁= 1.43 atmV₁= 7.7 LP₂= ?V₂= 1.64 LReplacing in Boyle's law:
1.43 atm× 7.7 L=P₂× 1.64 L
Solving:
(1.43 atm× 7.7 L)÷1.64 L=P₂
6.714 atm= P₂
Finally, the pressure will be 6.714 atm.
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when describing the uncertainty of a measurement, the term _____ refers to the closeness between a measurement and its accepted value, whereas the term _______ refers to the closeness among a set of measurements.
When describing the uncertainty of a measurement, the term accuracy refers to the closeness between a measurement and its accepted value, whereas the term precision refers to the closeness among a set of measurements.
What is measurement?Measurement is the process of measuring a quantity, namely comparing the value of the quantity we are measuring with other similar quantities that are used as a reference.
There are 2 things that need to be considered in measurement, namely accuracy, and precision.
When describing the uncertainty in the measurement process, accuracy is needed which refers to the closeness between the measurement and the received value, while precision is needed to refer to the closeness between a series of measurements.
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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Fe+2,Cr+4,I−,S−2
The empirical formula of at least four binary ionic compounds that could be formed is FeI₂, FeS, CrI₄, CrS₂.
We must figure out the proportions of each element in the compound in order to derive the empirical formula for the given compound. A formula known as an empirical formula is one that only specifies the relative amounts of the constituent elements in a given compound, not their precise numbers or arrangements.
Cations and anions can be added to the reaction to start it. The two distinct components constantly combine to create binary compounds. The ionic compounds that may be created from the provided ions have the following empirical formula:
One Iron ion Fe²⁺ paired up with two other iodine ions I²⁻ to form a binary molecule of FeI₂One Iron ion Fe²⁺ paired up with one sulphur ions S²⁻ to form a binary molecule of FeS.One Iron ion Cr⁴⁺ paired up with four other iodine ions I²⁻ to form a binary molecule of CrI₄When 1 ion of Cr⁴⁺ combines with 2 ions of sulphur, S²⁻ , the binary compound formed is CrS₂.Learn more about ionic compound at https://brainly.com/question/24154535
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suppose that we are told that the probability density for finding a photon on a screen is given by nm-1 between nm and nm, where there is a sensor that will register a 'click' if a photon is detected.
A. 0
B. ¼
C. ½
D. ¾
E. 1
Option C 1/2 will be the option that the sensor clicks if a photon is detected.
Probability = [tex]\int\limits^x_x {e(x)} \, dx[/tex]
= [tex]\int\limits^2_2 {1} \, dx[/tex]
= 2.5-2 = 0.5 = 1/2
A photon is a particle of light that carries the electromagnetic force. Photons are considered to be the basic building blocks of light and are responsible for many of its properties, including its ability to propagate through space and its interaction with matter.
The probability density function (pdf) for a photon describes the likelihood of finding the photon in a certain region of space. In other words, it gives us a way to determine the probability that a photon will be detected in a particular location on a screen or other detector.
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following the formal sign convention, please match the heat and work interactions with their appropriate signs:
The formal Positive sign convention for, work done by the system and heat transfer into the system. The Negative sign convention for heat transfer out of the system and work done to the system.
Thermodynamics is a special branch of chemistry that deals with concepts of heat, temperature and work and interconversion of heat into other forms of energy. Sign convention for heat : Heat transfer into the system is positive and heat transfer from the system is negative. In other words, all heat exchanges that increase the energy of a system are positive and all heat exchanges that decrease the energy of a system are negative. Sign rule for work :
If the task is running on the system, its sign is positive.If the system works, the sign is negative.To learn more about thermodynamics, refer:
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Complete question:
Following the formal sign convention, please match the heat and work interactions with their appropriate signs:Positive or Negative
1) work done by the system
2) heat transfer into the system
3) heat transfer out of the system
4) work done to the system
without doing any calculations, predict the closest value for the average atomic mass of the element m, and the reason for your choice using the information given below:
Without doing any calculations, the closest value for the average atomic mass of the element m is (a) the highest percent abundance & (d) 13.4.
The weighted average mass of the atoms that make up a naturally occurring sample of an element is what's referred to as its average atomic mass, which is also frequently referred to as its atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.
Since the average atomic mass of the element is close to the element with the highest percent abundance, which is close to 13.4 after doing the calculations, we got 13.815, which is close to 13.4.
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a reaction in which the energy of the reactants exceeds the amount of energy required for the reaction to proceed is called _____.
A reaction in which the energy of the reactants exceeds the amount of energy required for the reaction to proceed is called exergonic reaction .
What is an exergonic reaction?An exergonic reaction is one in which energy is released. Under constant temperature and pressure, Gibbs free energy (G) is negative because the reactants lose energy . These reactions typically do not require any energy to occur and thus occur spontaneously.
Exergonic reactions occur on their own. Exothermic reactions, such as mixing sodium and chlorine to make table salt, combustion, and chemiluminescence, are examples of exergonic reactions.
Thus, A reaction in which the energy of the reactants exceeds the amount of energy required for the reaction to proceed is called exergonic reaction .
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20. Maltose, C₁₂H₂2O1, is a sugar produced by malting (sprouting) grain. A solution of maltose at 25C has an osmotic pressure of 5.50 atm. What is the molar concentration of maltose?
If Maltose, C₁₂H₂2O1, is a sugar produced by malting (sprouting) grain. A solution of maltose at 25C has an osmotic pressure of 5.50 atm. the molar concentration of maltose is: 0.0381 mol/L.
How to find the molar concentration of maltose?We can use the relationship between osmotic pressure and molar concentration to calculate the molar concentration of maltose.
Π = CRT
where:
Π = osmotic pressure (in atm)
C = molar concentration of the solute (in mol/L)
R = ideal gas constant (0.0821 L·atm/mol·K)
T = temperature in Kelvin (25°C = 298 K)
Hence,
C = Π / (RT)
C = 5.50 / (0.0821 * 298)
C = 0.0381 mol/L
Therefore the molar concentration of maltose in the solution is 0.0381 mol/L.
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Orbitals with the same energy are called O A. atomic orbitals O B. quantum orbitals O C. antibonding orbitals D. degenerate orbitals O E. bonding orbitals
Orbitals with the same energy are referred to as degenerate orbitals. The correct answer D.
This means that the orbitals have the same energy level and their wavefunctions are indistinguishable from each other.
Degenerate orbitals can be either bonding, which means that the electrons within the orbital will have a lower energy when the orbitals overlap, or antibonding, which means that the electrons within the orbital will have a higher energy when the orbitals overlap.
When two atomic orbitals overlap, the electron density in the region between the nuclei of the two atoms may be either increased or decreased. If the electron density is increased, the resulting molecular orbital is called a bonding orbital, while if the electron density is decreased, the resulting molecular orbital is called an antibonding orbital.
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Which of the following is/are true regarding organic compounds? Select all that apply.
A) many are large and carry out complex functions
B) held together by hydrogen bonds
C) useful in building body structures
D) contain distinctive functional groups
E) contain carbon
F) all dissolve easily in water
The correct options are A) many are large and carry out complex functions, C) useful in building body structures, D) contain distinctive functional groups, and E) contain carbon.
Organic compounds are a type of chemical compound that contains carbon atoms bonded to other elements, such as hydrogen, oxygen, nitrogen, and others. They are found in all living organisms and are responsible for a wide range of biological processes, such as energy production, cellular respiration, and the synthesis of proteins and other biomolecules.
A) Many organic compounds are large and carry out complex functions, such as DNA and proteins.
B) Organic compounds are not held together by hydrogen bonds, but by covalent bonds.
C) Organic compounds are useful in building body structures, such as the cell membranes, muscles, and bones.
D) Organic compounds contain distinctive functional groups, such as carboxyl, amino, and hydroxyl groups, which give them their unique properties.
E) Organic compounds contain carbon, which is the basis for all life on Earth.
F) Not all organic compounds dissolve easily in water. Some, such as lipids, are hydrophobic and do not dissolve in water.
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from the following items, which is closest in size to one mole of gas at stp? group of answer choices a microwave a car an elephant a marble
A microwave is a proper response (option C). At Standard Temperatures and Pressures (STP), a mole of gas equals 6.022 x [tex]10^{23}[/tex] particles, which is a very huge volume of gas.
This is a huge number that is significantly larger than the majority of daily things. The size of a mole of gas at STP is considerably less than that of an automobile, an elephant, or even a marble.
Conversely, a microwave is the closest in size to this extraordinarily big volume of gas, even though it is still considerably less than a mole of gas at STP.
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The question is -
From the following items, which is closest in size to one mole of gas at STP?
A) A car
B) An elephant
C) A microwave
D) A marble
A gas has a pressure of 1.43 atm and occupies
a volume of 7.7 L. If the gas is compressed to
a volume of 1.64 L, what will its pressure be,
assuming constant temperature?
The final pressure of the gas will be 7.38 atm after it is compressed to a volume of 1.64 L.
What is pressure?
Pressure can be defined as the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
The pressure of the gas after compression can be calculated using the ideal gas law:
P1V1 = P2V2
Where
P1 is the initial pressure V1 is the initial volumeP2 is the final pressure V2 is the final volumeRearranging the equation for P2, we have:
P2 = P1 * (V1 / V2)
Plugging in the given values, we get:
P2 = 1.43 atm * (7.7 L / 1.64 L) = 7.38 atm
Therefore, The final pressure of the gas will be 7.38 atm after it is compressed to a volume of 1.64 L.
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The French chemist Antoine Lavoisier found that the weight of objects before burning and the weight of the products after burning were equal. He concluded that the total weight did not change during a process. Which of these best describes Lavoisier's conclusion?
1. From scientific law, Lavoisier created a scientific theory.
2. From experimentation, Lavoisier created a scientific law.
3. From observation, Lavoisier created a scientific theory.
Correct!
4. From observation, Lavoisier created a scientific law.
5. From observation, Lavoisier created a scientific conclusion.
The correct option is 4, From observation, Lavoisier created a scientific law these best describes Lavoisier's conclusion.
Lavoisier's scientific law, also known as the Law of Conservation of Mass, states that the total mass of a system remains constant throughout a chemical reaction. This means that the total mass of the reactants must equal the total mass of the products. Lavoisier's law was a groundbreaking discovery in the field of chemistry and helped lay the foundation for modern chemical reactions.
It was introduced by the French chemist Antoine Lavoisier in the late 1700s and has been widely accepted and used as a principle in chemical reactions ever since. This law is important in helping to explain the behavior of matter and energy in a chemical reaction, and it remains a fundamental principle in chemistry today.
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What is the formula of a compound containing K+ and O²+ ions?
the formula of a compound containing K+ and O²+ ions is Potassium oxide, K2O
what is Potassium oxide, K2O?
The ionic compound of potassium and oxygen is known as potassium oxide (K2O). This is the base. It is the simplest potassium oxide, and it is a pale yellow solid. It is an uncommon compound that is extremely reactive. A certain percent composition is used in the analysis of some industrial materials, such as cement and fertilizers, in order to approximate K2O.
The structure of K2O crystallizes as an antifluorite. In this motif, potassium ions are coordinated to 4 oxide ions and oxide ions to 8 potassium, which is the opposite of how the anions and cations were positioned in CaF2. When the basic oxide K2O reacts violently with water, caustic potassium hydroxide is formed. Since it is deliquescent, it will draw moisture from the air and start this powerful reaction.
As a fertilizer, it is extensively used in the agricultural sector. Additionally, the production of soap and glass both use potassium oxide. It is also known that potassium oxide is used in some medical procedures.
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A vessel containing the following gases is analyzed by a scientist:He, Ne, Ar, KrWhich of the following gases would be moving the slowest?A) NeB) ArC) KrD) He
The slowest moving gas would be He, since He has the lowest atomic weight of all the gases being analyzed.
This means that He molecules have the least amount of energy, and thus move the slowest. The speed at which a gases molecule moves is determined by its kinetic energy, which is proportional to the square of its mass. Therefore, the He molecules have the least kinetic energy and thus move the slowest. This is because He has the lowest atomic weight of all the gases: He (2.0), Ne (20.2), Ar (39.9), and Kr (83.8). The higher the atomic weight, the greater the kinetic energy and thus the faster the molecules will move.
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A scientist weighed three laboratory samples and recorded the data below. Record the total weight by determining the sum of the samples and then record the weight using scientific notation.
Sample 1: 0.00261 grams
Sample 2: 0.00362 grams
Sample 3: 0.00180 grams
Sample 1 = 2.61 * 10^-3 g
Sample 2 = 3.62 * 10^-3 g
Sample 3 - 1.80 * 10^-3 g
What is the scientific notation?We know that when we talk about the scientific notation we are talking about the way that we can use to reduce the bulk of the figures such that the figures that we have would be minimal.
In this case we have been told that the values of the samples can be given by;
Sample 1: 0.00261 grams
Sample 2: 0.00362 grams
Sample 3: 0.00180 grams
The task is to write these values by the use of the scientific notation.
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noncovalent interactions are critically important to the function of biomolecules. which of the following statements is/are (a) valid reason(s) for this importance?A.The effect of these weak interactions is cumulative. B.Their bond energies are ~10-100 times weaker than ordinary covalent bonds. C.Noncovalent interactions are made up of hydrogen bonding, electrostatic interactions, and dispersion forces. D.All of the listed statements are valid reasons for this importance.
D. All of the listed statements are valid reasons for the importance of noncovalent interactions in biomolecules.
The importance of noncovalent interactions in biomolecules is due to a combination of several factors:
A. The effect of these weak interactions is cumulative: Even though individual noncovalent interactions are weak, their combined effect can be significant and play a crucial role in the stability
B. Their bond energies are ~10-100 times weaker than ordinary covalent bonds: Because of their weaker bond energies, noncovalent interactions can be easily disrupted or formed, nature of biological systems.
C. Noncovalent interactions are made up of hydrogen bonding, electrostatic interactions, and dispersion forces: These three types of interactions allow for the specificity and diversity of biological interactions and play key roles in processes such as protein folding, DNA recognition, and ligand binding.
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explain why mould did not grow well on the bread spinkled with lemon juice?
Answer:
The mold didn't grow as well on the bread sprinkled with lemon juice because lemon juice is acidic. Acids hinder the growth of many common fungi and bacteria.
The moulds are neither plants nor animals, they are part of the kingdom fungi. They are found in many colours including white. The acid hinders the growth of mould.
What is mould?The moulds are defined as the microscopic fungi that live on plant or animal matter. They can be found indoors and outdoors and they are part of our natural environment.
The some of the important factors which affect the mould growth are temperature, acidity, pH, moisture levels, etc. The lemon juice contains the acid citric acid. So it has acidic character.
The mould cannot grow well on the bread sprinkled with lemon juice because the lemon juice is acidic. The acids hinder the growth of several fungi and bacteria. The pH of lemon juice is around 3. So the acidic substances can kill a lot of moulds.
But vinegar does not kill all moulds and its pH is around 2.5.
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identify the kind(s) of intermolecular forces that would occur between the solute and solvent in an acetic acid (which is polar and contains an oh group) solution.
Intermolecular forces that would occur between the solute and solvent in an acetic acid are Hydrogen bridges, dipole-dipole interactions and dispersion force.
As a polar organic acid with a hydroxile group incorporated into a carboxyle function group, acetic acid has the ability to generate hydrogen bonds. On the other hand, because it can be partially dissociated, a piece of the chain that is partially positive or partially negative might engage in dipole-dipole interactions with other molecules.
Last but not least, London dispersion forces, a weaker version of the dipole-dipole interactions, are present when the electrons in two nearby atoms hold positions that cause the atoms to temporarily form dipoles.
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12. If a gas canister contains 1.45 L of fuel, and the fuel density is 0.710 g/cm³. What is the mass of the fuel contained in the gas canister? (1cm³= 1mL)
The density of the fuel within a gas canister is 0.029 cm³ if the canister holds 1.45 L of gasoline and the gasoline has a density of 0.710 g/cm³.
Why is density crucial?A place's density describes how many things there are there, which could include people, animals, plants, or other objects. To calculate density, multiply this quantity by the area's dimensions. The population density of a nation is determined by dividing the total population by the area, measured in square kilometers and miles.
According to the given information:Volume of canister = 1.45 L.
Convert it to cm³.
The conversion formula is : 1 L = 1000 cm³
So;
1.45 L = 1.45 L × (1000 cm³)/1 L
= 1450 cm³
Mass of the fuel = volume × density
= 1450 cm³ × 0.710 g/ cm³
= 1029.5 g
Convert g to kg:
1029.5 g × (1 kg/ 1000 g)
= 1.0295 kg.
= 1.03 kg (approximately)
Mass of drop of gasoline = 22 mg
= 22 mg ×(1 g/ 1000 mg)
= 0.022 g
Volume = mass/ density
= 0.022 g/ (0.754 g/cm³)
= 0.029 cm³
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If the decomposition of (NH4)2(CO3) is a first-order process with a rate constant of 0.116 s-1, how much ammonium carbonate would remain after 34.1 s, starting from a concentration of 0.947 M?
The rate of the decomposition of 0.947 M ammonium carbonate is 0.109 M/s. Then, the concentration of the reactant after 3.4 s is 0.64 M.
What is reaction rate?The rate of a reaction is the rate of disappearance of the reactants or rate of appearance of the products. The rate is directly proportional to the concentration of the reactants.
For a first order reaction:
rate = k [A]
given k = 0.116 s⁻¹
[A] = 0.947 M.
Rate of decomposition = 0.947 M × 0.116 s⁻¹ = 0.109 M/s.
Then, after 3.4 s = 3.4 × 0.109 M/s. = 0.370 M disappears.
The remaining concentration of the reactant = 0.947 - 0.370 = 0.64 M.
Therefore, the remaining concentration of ammonium carbonate will be 0.64 M.
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write iupac names for the compounds below. aniline p-chloro if you use them, abbreviate ortho-, meta-
Aniline has an amine group attached to the phenyl ring. Hence, the IUPAC name: phenylamine
1 and 4 position of the benzene ring is substituted with chlorine atoms. Hence, the IUPAC name: 1, 4-dichlorobenzene
What is IUPAC ?
International chemistry and allied disciplines and technologies are represented by the International Union of Pure and Applied Chemistry (IUPAC). As a result, IUPAC nomenclature can be thought of as a system for naming organic compounds in accordance with predetermined guidelines. answer that is thorough and detailed.
What is compound ?
A compound combines one or more additional substances to form a new product. The combination of two substances or elements is equal to the mass ratio for making that product. It is attached firmly, and they have equal in all ways to form a combination. The elements both are bonded together. Each compound has its chemical structure; if it breaks, it can either split into two atoms or molecules or in a single. Different types of compounds are present. An intermetallic compound is made of an alloy of metallic ions. The ions form ionic compounds with the help of the electrostatic force.
Aniline has an amine group attached to the phenyl ring. Hence, the IUPAC name: phenylamine
1 and 4 position of the benzene ring is substituted with chlorine atoms. Hence, the IUPAC name: 1,4-dichlorobenzene
Therefore, IUPAC names for the compounds are mentioned above.
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For this experiment, the melting point will be used for which of the following qualitative purposes? 00000 Select all that are True. To determine the eutectic melting point of the impure solid. To determine the purity of the recrystallized solid. To determine the amount of impurity that was present in the unknown solid. To determine the identity of the unknown solid.
The melting point of a solid can be used for the following qualitative purposes:
To determine the purity of the recrystallized solid.
To determine the identity of the unknown solid.
Impurities cause a substance's melting point to rise or fall, whereas a pure substance has a clearly defined melting point.
One can determine whether a sample is pure or impure by comparing the melting point of the sample to the known melting point of a pure substance.
A solid's melting point can be used to identify it. It is frequently possible to identify an unknown solid by comparing its melting point to the melting points of various reference materials.
How the melting point of a solid can be used to assess its purity?
Melting points can be used to determine whether a substance is pure or impure because an impure substance is a particular kind of mixture. Impure materials typically have a wider melting temperature range and a slightly lower melting point than pure materials.
What is the importance to identify the melting point of the recrystallized compound?
The melting point must be established. It can be used to identify a known compound first. Second, it may aid in the later definition of an unidentified compound. Third, it can be used to assess a substance's purity.
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