When setting up your experiment, sodium hydroxide is added to the buret and acetic acid is pipetted into the Erlenmeyer flask. one to two drops of phenolphthalein are added to the Erlenmeyer flask along with additional water to bring the total volume to 50 ml before beginning the titration.
Steps for conducting titration.
First of all pipette and burette should be rinsed 3 times with distilled water and then 3 times with the solution they will measure and transfer. Then after add suitable amount of indicator. This procedures should be consistent across all titrations; 3 drops is usual.
We must ensure that all glassware is properly cleaned and rinsed before beginning any analysis.
Erlenmeyer flasks are the flasks that are used to contain liquids and for mixing, heating, cooling, incubation, filtration, storage, and other liquid-handling processes. They have slanted sides and narrow necks which allow the contents to be mixed by swirling without the risk of spills, which is useful for titrations and for boiling liquids.
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hazmat labels are used to communicate information necessary to protect human health and the environment? true or false
Answer:
True
Explanation:
True because Hazmat labels are used to communicate information necessary to protect human health and the environment. They are used to identify the presence of hazardous materials, and provide information about the risks associated with these materials.
what two things are involved in the provision of the welfare state
What is missing is 234/90 Th
What is the alpha decay?We know that when we talk about the radioactive decay, we are talking about the breaking up of the radioactive nucleus into its components. The components of the radioactive nucleus can be seen on the left hand side of the reaction equation.
In this case, we can see that what we have here is actually an alpha decay as what has been given off on the right is an alpha particle from the image that has been shown here as concerns the radioactive decay of the isotope
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gef4 gecl4 g for each pair of compounds listed, check the box next to the one with the higher boiling point.
The compound with the higher boiling point in this pair is GeF₄. The boiling point of GeF4 is 128 °C, whereas the boiling point of GeCl₄ is only -40.6 °C.
This is due to the larger size of the GeF₄ molecule, which results in stronger London dispersion forces between molecules, increasing the boiling point.
London dispersion forces are extremely weak attractive forces between atoms or molecules caused by the electrostatic attraction between temporary induced dipoles. They arise due to the uneven distribution of electrons within an atom or molecule, which causes one end of the atom or molecule to become slightly positively charged and the other end to become slightly negatively charged.
These charges attract each other, resulting in a temporary attractive force between the two atoms or molecules. London dispersion forces are the weakest of the intermolecular forces, but they are still important in determining the properties of substances.
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Use the following information to answer questions 16 and 17.
M2R3(aq) + 3TS2(aq) → 2MS3(s) + 3TR(S)
M2R3 and TS, are both ionic compounds. When 20.0 mL of a
1.0 M solution of M2R3 and 50.0 mL of a 1.0 M solution of TS2
are mixed, two precipitates are formed.
16. After the reaction has gone to completion, what ions remain in
solution?
(A) M and R
(B) T and S
(C) M and S
(D) T and R
he correct answer is (C) M and S, which are the ions that remain in solution after the reaction has gone to completion.
When 20.0 mL of a 1.0 M solution of M2R3 and 50.0 mL of a 1.0 M solution of TS2 are mixed, a reaction occurs, producing two precipitates, MS3 and TR. The precipitates are solid compounds that are no longer in solution, so they are not included in the ions that remain in solution.
Based on the balanced chemical equation, the reactants in solution are M2R3 and TS2, which means that the ions that remain in solution are M and S (option C). The reaction consumes the R and T ions, causing them to combine with the M and S ions to form the solid precipitates.
Therefore, the correct answer is (C) M and S, which are the ions that remain in solution after the reaction has gone to completion.
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compare intracellular fluid and extracellular fluid with respect to chemical composition and location.
Intracellular fluid (ICF) is the fluid that exists within the cells of the body and makes up about two-thirds of the body’s water. It is composed primarily of water, electrolytes, and proteins and is separated from the extracellular fluid (ECF) by the cell membrane.
ECF is the fluid that exists outside of the cells and makes up about one-third of the body’s water. It is composed primarily of water, electrolytes, and proteins and is separated from the ICF by the cell membrane.
The chemical composition of the ICF and ECF differ slightly due to the presence of different ions, proteins, and glucose concentrations. The ICF has a higher concentration of potassium and other inorganic ions, while the ECF has a higher concentration of sodium and other organic ions.
The ICF also has a higher concentration of proteins, while the ECF has a higher concentration of glucose. In terms of location, the ICF is found inside the cell and the ECF is found outside the cell.
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8.
9.
Your ear canal is closed off from the outside environment by the eardrum. Explain why your ears feel
pressure if you go below water.
Airplanes have pressurized cabins while flying. What do you think is the purpose of this pressurization?
Explain your answer.
You are selected to be the first high school student on the International Space Station. Explain what happens
to the gas in your spacecraft and in your body at each of these times:
a. prior to takeoff, inside the rocket, wearing your space suit.
b. Just prior to leaving the atmosphere and entering space.
c. onboard the ISS with your space suit off.
Please help thank you for your time helping me have a great day!!!!!!!!
1. The ears feel pressure below water because of the pressure of the water above and the atmospheric pressure.
2. The purpose of this pressurization is to ensure that the pressure in the ear and that of the outside atmosphere are equal.
3. What happens to the gas in your spacecraft and in your body at each of these times is as follows:
A. prior to takeoff, inside the rocket, wearing your space suit, the air pressure is the same
B. The air pressure is greater
C. The air pressure is less
What is air pressure?The force that air, whether compressed or unconfined, applies to whatever surface it comes into touch with is known as air pressure.
Air pressure is also known as atmospheric pressure and varies based on altitude.
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What do the solid lines on the topographic map represent?
The solid lines on a topographic map typically represent contour lines, which are used to show the changes in elevation of the land surface.
What is a topographic map used for?A topographic map is used to represent the three-dimensional features of the terrain on a two-dimensional surface. The topographic map shows the location, shape, and elevation of natural and man-made features on the earth's surface, such as hills, valleys, rivers, lakes, roads, buildings, and contour lines.
These lines connect points of equal elevation and show the shape and slope of the terrain. They can be used to visualize the topography of an area and can be useful for navigation, planning hikes, and other outdoor activities.
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Solid iron (III) hydroxide decomposes to produce iron (III) oxide and water vapor. Write a balanced equation. If 0.75 L of water vapor are produced at STP,
Fe(OH)3 --> Fe2O3 + H2O (YOU MUST BALANCE THIS BEFORE STARTING)
a. How many grams of iron (III) hydroxide were used? _________ grams of iron (III) hydroxide (3 sig figs)
b. How many grams of iron (III) oxide were produced? __________ grams of iron (III) oxide (3 sig figs)
50 points
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.
which of the following lewis diagrams best represents the bonding in the n2o molecule, considering formal charges? responses
In the lewis diagram of N₂O molecule, a triple bond is formed between the nitrogen atoms, which means, in the Lewis diagram the nitrogen atoms are connected with three lines.
The Lewis diagram is used to represent the way in which two or more atoms are bonded to each other. This is possible by using lines to represent bonds and dots to represent the electrons.
In the case of the molecule N₂O bonding occurs in such a way that the oxygen atom is connected to one of nitrogen atoms. The nitrogen atom that is not connected to the oxygen will have 2 electrons which is represented by dots as the number of valence electrons is 5, but in case of triple bond three are used.
The oxygen atom has 6 electrons represented by dots, which is equal to the number of valence electrons.
Considering the formal charges, the lewis structure in which the electronegative oxygen atom (O) contains a negative charge and the electropositive nitrogen atom (N) contains a positive charge represents bonding in the N₂O molecule.
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For which equation is the enthalpy change described as an enthalpy change of formation?
A CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s)
B Cu(s) + S(s) + 2O2(g) → CuSO4(aq)
C 5H2O(l) + CuSO4(s) → CuSO4.5H2O(s)
D Cu(s) + S(s) + 2O2(g) → CuSO4(s)
5 H₂O(l) + CuSO₄(s) → CuSO₄.5 H₂O(s) is the chemical equation which describes as an enthalpy change of formation.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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if this reaction were being used to generate heat, how many grams of c12h26 would have to be reacted to generate enough heat to raise the temperature of 750g of liquid water from 10oc to 90oc?
9.7 g of C₁₂H₂₆ would have to be reacted to generate enough heat to raise the temperature of 750 g of liquid water from 10°C to 90°C.
To calculate the amount of heat required to raise the temperature of water, we can use the specific heat capacity of water, which is 4.184 J/g°C.
The amount of heat required to raise the temperature of 750 g of water from 10°C to 90°C is given by the following equation:
Q = mcΔT
where m is the mass of water, c is the specific heat capacity of water, and ΔT is the change in temperature.
Q = 750 g × 4.184 J/g°C × (90°C - 10°C) = 28,665 J
We need to determine the amount of heat produced by the reaction of C₁₂H₂₆ with oxygen to form CO₂ and H₂O. We can use the following equation:
C₁₂H₂₆ + 19/2 O₂ → 12 CO₂ + 13 H₂O
The standard enthalpy change of combustion (ΔH°c) for C₁₂H₂₆ is -50,540 kJ/mol. We can use this value to calculate the amount of heat generated per mole of C₁₂H₂₆.
Q = ΔH°c × n = -50,540 kJ/mol × n
where n is the number of moles of C₁₂H₂₆ reacted.
Finally, we can calculate the number of moles of C₁₂H₂₆ required to generate the desired amount of heat by dividing the total heat required by the heat generated per mole of C₁₂H₂₆:
n = Q / ΔH°c = 28,665 J / (-50,540 kJ/mol) = 0.0568 mol
And finally, we can convert moles to grams using the molar mass of C₁₂H₂₆, which is approximately 170.3 g/mol:
m = n × M = 0.0568 mol × 170.3 g/mol = 9.7 g
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if the absolute pressure in a tank is 140 kpa, and the atmospheric pressure is 100 kpa. Determine the pressure head in mm of mercury.
If the absolute pressure in a tank is 140 kpa, and the atmospheric pressure is 100 kpa. 0.2998 m is the pressure head in mm of mercury.
What is pressure ?
The definition of pressure is the amount of force that is exerted to a certain region. It can be calculated mathematically as P=FA, where F is the force applied perpendicular to surface area A. The pascal (Pa), or one newton per square metre (N/m 2), is the accepted unit of pressure..
What is temperature ?
Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).
Gauge pressure= absolute pressure - atmosphere pressure
= 140-100
= 40Kpa
∴Gauge pressure = Pm × g × hm
40×10³= 13600× 9.01× hm
hm= 0.2998 m
Therefore, If the absolute pressure in a tank is 140 kpa, and the atmospheric pressure is 100 kpa. 0.2998 m is the pressure head in mm of mercury.
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sodium chloride can be formed by the reaction of sodium metal and chlorine gas. if 45.98 g of sodium combines with an excess of chlorine gas to form 116.89 g of sodium chloride, what mass of chlorine gas is used in the reaction?
Sodium chloride can be formed by the reaction of sodium metal and chlorine gas. if 45.98 g of sodium combines with an excess of chlorine gas to form 116.89 g of sodium chloride, the mass of chlorine gas is 70.9g.
What is sodium chloride?Sodium chloride, also known as salt (though sea salt contains additional chemical salts), would be an ionic substance with the chemical formula NaCl, which represents a 1:1 ratio of chloride and sodium ions.
The salt chiefly responsible for the saltiness of seawater and the osmotic pressure of several multicellular organisms is sodium chloride. Salt is extensively utilized as a condiment as well as food preservative in its edible form.
According to law of conservation of mass
Na + 1/2 Cl[tex]_2[/tex] → NaCl
mass of Na + mass of chlorine gas= mass of sodium chloride
45.98+ mass of chlorine gas = 116.89
mass of chlorine gas =116.89-45.98=70.9g
Therefore, the mass of chlorine gas is 70.9g.
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Complete the following statements: (4.2,4.3)
a. The atomic number gives the number of ________ in the
nucleus.
b. In an atom, the number of electrons is equal to the number of ___________.
c. Sodium and potassium are examples of elements called ____________.
a. The atomic number gives the number of protons in the nucleus.
b. In an atom, the number of electrons is equal to the number of protons.
c. Sodium and potassium are examples of elements called alkali metals.
Alkali metals are elements located in Group 1 on the periodic table, and they are extremely reactive. They are characterized by having a single electron in their outer shell, which makes them highly reactive and prone to forming chemical bonds. Alkali metals are found in the atmosphere, in the soil, and in the human body, and they are essential for life. They are also used in various industries, including the production of fertilizers, cleaning agents, and medicines.
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Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed, and determine which order is likely for that reactant. Assume all other factors are held constant. The reaction rate is constant regardless of the amount of reactant in solution. a. second b. orderfirst c. orderzero d. order
Order zero. Concentration data is commonly monitored during a reaction to determine the order with respect to a reactant. Consider the types of observations listed.
What is observations ?Observations are the data collected through direct or indirect means. It is the process of gathering information by watching, listening, and measuring in order to gain knowledge and understanding. Observations can be qualitative, meaning they involve descriptions and subjective information, or quantitative, meaning they involve measurements and objective information. Examples of observational data include surveys, interviews, audio recordings, video recordings, and physical measurements. Observations are used to learn more about the world around us and to make informed decisions.
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PLEASE PLEASE PLEASE HELP ME
The standard reduction potentials for copper, chromium and nickel ions.
What are ions?Ions are atoms or molecules that have an abnormally high proton content compared to their electron content, producing a net electric charge. Ions can have either a positive charge (referred to as cations) or a negative charge (called anions). Ions can arise when electrons are gained or lost.
(a) Cr3+, Ni2+, and Cu2+ are the three reducing agents with the strongest effects. This is due to the fact that Cr3standard +'s reduction potential is lower (-0.74 V) than Ni2 +'s, which is lower (-0.25 V), which is lower (-0.34 V), and so on. Stronger reducing agents are required for higher adverse reduction potentials.
(b)The standard reduction potential of Cr (s) is -0.74 V, which is more negative than that of Cu2+ (+0.34 V), and this explains why the reaction is spontaneous under standard conditions. As a result, an unplanned reaction will take place when electrons move from the Cr (s) to the Cu2+ (aq) ion.
(c) The concentration of the fluid at the cathode would drop after the cell had been discharged continually. This is because the reduction of Cu2+ (aq) to Cu (s) at the cathode would result from electrons flowing from the anode to the cathode. The reaction would become less spontaneous as the concentration of Cu2+ (aq) near the cathode dropped, eventually stopping the process.
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For each pair of compounds listed, check the box next to the one with the higher boiling point. compounds higher boiling point SiF4 GeF Geld CCI CI o Х 6 ?
The boiling point of a compound is determined by the strength of the intermolecular forces between its constituent molecules. Stronger intermolecular forces result in a higher boiling point.
The boiling point information for each of the compounds:
SiF₄ has a boiling point of -90.1°C.
GeF₄ has a boiling point of -67.2°C.
So, SiF₄ has a higher boiling point than GeF₄.Geld has a boiling point of 63.6°C.
CCl₄ has a boiling point of 77.7°C.
So, CCl₄ has a higher boiling point than Geld.CO has a boiling point of -191.5°C.
CI₂ has a boiling point of -39.8°C.
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Given a sample of (R)-2,3-dimethylhexan-3-ol, which of the following would be the best synthesis of (R)-3-chloro-2,3-dimethylhexane?a.) PCl3b.) SOCl2c.) HCl/ZnCl2d.) 1. TsCl/Pyridine 2. NaCl
The best synthesis of (R)-3-chloro-2,3-dimethylhexane from (R)-2,3-dimethylhexan-3-ol would be using PCl3.
PCl3 is a commonly used reagent for chlorination reactions, and it can efficiently convert alcohol into the corresponding alkyl chloride.
What does PCl3 do in a reaction?
Phosphorus trichloride (phosphorus chloride, PCl3) is a colorless fuming liquid that reacts violently with water to liberate phosphoric acid and hydrogen chloride (HCL) gas. PCl3 is a strong oxidizer and will readily react with many organic compounds.
What is PCl3 used for?
Phosphorus Trichloride is a colorless, clear, fuming liquid with a strong odor. It is used in gasoline additives and textile finishing, and to make other chemicals, pesticides, dyestuffs, catalysts, and plasticizers.
Is PCl3 oxidizing or reducing agent?
PCl(3) can act as an oxidizing as well as a reducing agent
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select all names that correspond to an isomer of 4-isopropylheptane. question options: 3,4-diethylhexane 4-(methylethyl)heptane decane 2,2,3-trimethyloctane 2-methylnonane
All four compounds are isomers of 4-isopropylheptane, and each isomer has its own unique properties, such as boiling point, melting point, solubility, and other physical properties.
The names of the isomers of 4-isopropylheptane are 3,4-diethylhexane, 4-(methylethyl)heptane, 2,2,3-trimethyloctane, and 2-methylnonane. 3,4-diethylhexane and 4-(methylethyl)heptane are structural isomers, which means that the molecules have different structural formulas and connectivities. 3,4-diethylhexane has two ethyl groups attached to the fourth carbon, while 4-(methylethyl)heptane has one methyl and one ethyl group attached to the fourth carbon. 2,2,3-trimethyloctane and 2-methylnonane are both positional isomers, meaning that the molecules have the same structural formula but the groups attached to the carbon chain are arranged differently. 2,2,3-trimethyloctane has three methyl groups attached to the second, third, and fourth carbons, while 2-methylnonane has two methyl groups attached to the second and ninth carbons.
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Please help with the problem attached:
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 6.00 moles of aluminum sulfate, Al2(SO4)3 .
One mole of the compound Al₂ (SO₄)₃ contains 2 moles of Al, 3 moles of sulphur atoms and 6 moles of O₂ gas.
What is aluminum sulphate ?Aluminum sulphate is an ionic compound formed by the donation of electrons from the Al metal to the sulphate group. In the sulphate group, the oxygen and sulphur are covalently bonded.
The reaction of the formation of aluminum sulphate can be written as follows:
[tex]\rm 2Al + 3 SO_{4} \rightarrow Al_{2}(SO_{4})_{3}[/tex]
Here, one mole of this compound is formed by 2 moles of Al and 3 moles of sulphate group. 3 moles of sulphate group contains 3 moles of S and 6 moles of O₂.
Then, 6 moles of Al₂ (SO₄)₃ contains 12 moles of Al, 18 moles of S and 36 moles of oxygen gas.
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HELP!!! ILL MARK YOU AS BRAINLIST
Show a calculation converting the average mass of a quarter from grams to ounces using
the relationship 1 oz = 28.3 grams. How does your calculated value compare with the
value you measured on the scale in ounces?
Answer:
Explanation:
The value you measured on the scale in ounces = X
28.3 grames = 1oz
1/4of grames= 1/28.3 *1/4
You have to compare as below;
if you want to convert the measured scale to grames ; multiply by 28.3
if you want to convert measured to oz ; you have to (1/28.3 *1/4) *X/4
magnesium sulfate (MgSO4) major species present when dissolved in water
The species in water are the Mg^2+ and SO4^2-
How do ionic substances dissolve in water?Ionic substances dissolve in water because of the attraction between the positive and negative charges of the ions and the polar water molecules. The ions are surrounded by water molecules through a process known as solvation, which causes the ionic substance to break apart into individual ions.
The positive and negative charges of the ions are attracted to the opposite charges on the water molecules, which allows the ions to be dispersed evenly throughout the water. This makes the substance appear to have dissolved, even though the individual ions are still present in the solution.
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Samples of NaF(s) and NH4Cl(s) are dissolved in separate beakers that each contain 100 mL of water. One of the salts produces a slightly acidic solution. Which of the following equations best represents the formation of the slightly acidic solution? (A) Nat(aq) + 2 H2O(l) + NaOH(aq) + H2O+(aq) (B) F (aq) + H2O(1) = HF(aq) + OH(aq) (C) NH4+(aq) + H2O(l) + NH3(aq) + H2O+(aq) (D) Cl(aq) + H2O(l) + HCl(aq) + OH(aq)
Samples of NaF(s) and NH₄Cl(s) are dissolved in separate beakers that each contain 100 ml of water. The equation that best represents the formation of the slightly acidic solution will be option c.
NH⁴⁺(aq) + H₂O(l) --- NH₃(aq) + H₃O(aq)
The NH4Cl salt forms a slightly acidic solution as it generates hydronium ions when dissolved in water. The NaF salt does not generate hydronium ions when dissolved in water, so it forms a neutral solution. Substitute with "Sodium fluoride is an inorganic salt of fluoride carrying molecular formula NaF." Sodium fluoride solutions are utilized with hard water-insoluble mixtures of calcium and magnesium fluoride can constitute. It is a dry chemical utilized in the fluoridation of drinking water, it should be manually cogitated and summed up in the mixing tank. NH₄Cl is an inorganic compound with the chemical term Ammonium chloride.
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How many moles of Al2O3 can be produced from the reaction of 10.0 g of Al and 19.0 g of O2?
(a) 0.581 mol (b) 0.371 mol (c) 0.185 mol (d) 0.396 mol
Answer: c) 0.185mol
Explanation:
First you need to create a balanced equation.
Al + O2 ---> Al2O3 (this is currently unbalanced)
When balanced, it is:
4Al + 3O2 ---> 2Al2O3
Then you need to find the limiting reactant (the way I do this is by taking both of them, doing dimensional analysis, and seeing which makes a smaller amount of product)
For Al:
10.0g Al * (1mol Al / 26.98g Al) * (2mol Al2O3 / 4mol Al) = 0.185mol Al2O3
For O2:
19.0g O2 * (1mol O2 / 32.00g O2) * (2mol Al2O3 / 3mol O2) = 0.396mol Al2O3
Since the amount of Al2O3 produced is smaller when using 10.0g Al, this is the limiting reactant and therefore the answer is 0.185mol Al2O3.
The vapor pressure of liquid X is lower than that of liquid Y at 20oC, but higher at 60oC. What can you deduce about the relative magnitude of the molar heats of vaporization of X and Y?
Hint: ln(P1/P2)= Hvap/R (1/T2-1/T1)
Vapor pressure of X is lower than Y at 20°C, therefore heat of vaporization pf X is greater than Y.
What is vapour pressure ?Vapour pressure is a measure of a material's tendency to change into a gaseous or vapour state, and it rises with temperature.
The boiling point of a liquid is the temperature at which the vapour pressure at its surface equals the pressure exerted by its surroundings.
Heat of vaporization ∝ 1 ÷ Vapour pressure
But at 60°C vapour pressure of X is greater than Y.
Thus, at this temperature heat of vaporization pf Y is greater than X
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Why does Jim say he is not including the location of Treasure Island in chapters 1-3 of Treasure Island?
A. He does not remember where it is.
B. There is still treasure on it.
C. It is too dangerous of a place.
D. He is ashamed of what happened there.
Jim say that he is not including in the location of Treasure Island because 'it is too dangerous of a place'.
What do you mean by Treasure Island?
Treasure Island is an adventure novel by Scottish author Robert Louis Stevenson, first published in 1883. It is the story of young Jim Hawkins and his quest to find buried treasure on a tropical island. The novel is considered to be a classic of children's literature and is one of the most frequently dramatized of all novels.
Treasure Island is a fictional island that is filled with danger and adventure. Jim knows that venturing to this island would be a risky endeavor, so he has decided to stay away. He believes that it is too dangerous of a place to be included in his travels.
Hence, option C is correct.
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Calculate the molarity of the solution in a flask that contains 2.50 moles of potassium sulfate in 125 mL of solution.
Answer:
20M or 20mol/L
Explanation:
molarity = moles/volume (in Liters)
= 2.5/0.125L
=20M or 20 mol/L
Identify the structure of S (molecular formula C7H14 O2).
Compound S the odor of rum, H NMR data (ppm) at 0.93 (doublet, 6H), 1.15 (triplet, 3H), 1.91 (multiplet, 1H), 2.33 (quartet, 2H), and 3.86 (doublet, 2H) ppm.
The molecular formula of compound S, C₇H₁₄O₂, suggests that it is a secondary alcohol or an aldehyde.
What is this compound "C₇H₁₄O₂"?The compound "C₇H₁₄O₂" is a molecular formula which represents the chemical structure of an organic compound containing 7 Carbon atoms, 14 Hydrogen atoms and 2 Oxygen atoms. The H NMR data is consistent with a secondary alcohol, as the doublet at 0.93 ppm and the doublet at 3.86 ppm correspond to the CH3 groups and the multiplet at 1.91 ppm corresponds to the OH proton.
The triplet at 1.15 ppm corresponds to the CH₂ group and the quartet at 2.33 ppm corresponds to the CH group. Based on these spectral data, it is likely that compound S is a secondary alcohol with the molecular formula C₇H₁₄O₂.
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Indicate the subatomic particle described by each of the statements. A statement may describe more than one particle.____ possesses a negative charge____ has no charge ____ has a mass slightly less than that of a neutron ____ has a charge equal to but opposite in sign to that of an electron ____ is not found in the nucleus ____ has a positive charge ____ can be called a nucleon ____ is the heaviest of the three subatomic particles ____ has a relative mass of 1836 if the mass of an electron is 1 ____ has a relative mass of 1839 if the mass of an electron is 1Answer BankProtonNeutronElectron
Here's a matching of the subatomic particles described in each statement:
____ possesses a positive charge ---> Proton
____ has no charge ---> Neutron
____ has a mass slightly less than that of a neutron ---> Electron
____ has a charge equal to but opposite in sign to that of an electron ---> Electron
____ is not found in the nucleus ---> Electron
____ has a positive charge ---> Proton
____ can be called a nucleon ---> Proton and Neutron
____ is the heaviest of the three subatomic particles ---> Neutron
____ has a relative mass of 1836 if the mass of an electron is 1 ---> Proton
____ has a relative mass of 1839 if the mass of an electron is 1 ---> Neutron
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