Change is inevitable as everything in the world changes. some are man-made and some are natural.
A change may be categorized under chemical change and physical change:
Physical change
A substance is termed to be physically changed when only the physical property changes such as shape, size, color, and state, and its chemical position remain unchanged.
1- Change can be temporary in nature.
2- Internal structure remains unchanged.
3- Physical changes are mostly reversible.
Chemical change
when the change is internal it becomes permanent in nature as a result, it will form or break the molecules leaving behind the changed substance.
1- Changes are mostly permanent in nature.
2- A chemical change is irreversible and therefore the opposite of physical change.
3- One or more than one substance is formed.
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Write the symbol for every chemical element that has atomic number greater than 6 and atomic mass less than 25.2 u.
Answer:
C, Carbon
Explanation:
Write the symbol for every chemical element that has atomic number greater than 6 and atomic mass less than 25.2 u.
Identify the major product that is expected when acetaldehyde is treated with LiAlH4, followed by aqueous workup. A methanol, B.acetic acid C.propanol D.acetone E. etanol
The correct option is A. Methanol. When acetaldehyde is treated with LiAlH4, followed by aqueous then methanol will produce.
When acetaldehyde is treated with LiAlH4, the reaction results in the reduction of the aldehyde group to an alcohol. The LiAlH4 reacts with the acetaldehyde to form a charged intermediate species known as an enolate.
The enolate then undergoes hydrogenation, resulting in the production of methanol. Following the reaction, an aqueous workup is performed to hydrolyze the enolate and separate any impurities from the product. The aqueous workup also ensures that the LiAlH4 is completely neutralized, thus allowing for the recovery of the methanol as the major product.
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Which of the following actions are permitted in balancing a chemical equation? Select all that apply.Multiplying all coefficients by a common factor
Inserting coefficients in front of formulas of reactants and products
When balancing a chemical equation, it is permitted to multiply all coefficients by a common factor, as well as inserting coefficients in front of formulas of reactants and products.
Additionally, you can also add reactants or products, and raise the coefficients.
When balancing a chemical equation, it is important to consider the mole ratio, which is the ratio of the number of moles of each reactant to the number of moles of each product. To balance the equation, you need to adjust the coefficients of the reactants and products until the mole ratios are equal.
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Where do nitrogen in oxides of nitrogen come from
In the equation:
2H₂ + O2 → 2H₂O
How many moles of hydrogen react with 0.37 mol of oxygen
Answer:
0.74 moles of hydrogen
Explanation:
f 0.37 mol of oxygen reacts, then the number of moles of hydrogen will also be 0.37 mol. According to the equation, 2 moles of hydrogen are required to react with 1 mole of oxygen, so 2 * 0.37 = 0.74 moles of hydrogen will react with 0.37 mol of oxygen.
Which of the following elements would be a good selection as the sacrificial electrode in the cathodic protection of tin (Sn)?I. SilverII. CopperIII. NickelIV. Magnesium
Magnesium would be a good selection as the sacrificial electrode in the cathodic protection of tin (Sn).
Why is magnesium used as a sacrificial anode?
Chemically, magnesium is oxidation resistant and this is because its surface is covered with a thin layer of oxide which protects it from being vulnerable to air. This is why it is highly suitable for use in sacrificial anodes to limit the effects and susceptibility of other metal surfaces to corrosion.
What is the best sacrificial anode?
Magnesium anodes are the most active and are the only anodes that work well in the low conductivity of fresh water. Magnesium is also relatively non-toxic to aquatic life.
Why is tin resistant to corrosion?
Tin has good corrosion resistance properties in gas, weak base, and weak acid environment at room temperature because the super potential of hydrogen on the metal tin is high.
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A student placed a straw into the water and blew bubbles into the water for 30 seconds. The pH of the glass of tested again.
Use the pH scale below to determine the pH value of the water in this test. Record the value. Also, determine whether the
pH stayed the same, became more acidic, or became more alkaline compared to the first test.
A student placed a straw into the water and blew - 1
Record the value. Also, determine whether the pH stayed the same, became more acidic, or became more alkaline compared to the first test.
What is alkaline and is it good for you?Alkaline water has a higher pH level than that of plain tap water. So proponents say that it can neutralize acid in your bloodstream. Some say that alkaline water can help prevent disease, such as cancer and heart disease.
Which foods are alkaline?Most fruits and vegetables, soybeans and tofu, and some nuts, seeds, and legumes are alkaline-promoting foods, so they're fair game. Dairy, eggs, meat, most grains, and processed foods, like canned and packaged snacks and convenience foods, fall on the acid side and are not allowed.
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If concentrations are measured in M and time in seconds, what are the units for the rate constant, , for the rate law: Rate=[A][B]2.
If concentrations are measured in M and time in seconds, M³s⁻³ is the units for the rate constant, , for the rate law, Rate=[A][B]².
What is rate of reaction?The rate of the reaction or rate of the reaction is the rate at which an chemical reaction occurs, defined as proportionate to the rise in product concentration per unit time and the reduction in reactant concentration per unit time.
The speeds of reaction might vary greatly. For example, oxidative corrosion of iron in the Stratosphere is a slow reaction that really can take several years, but cellulose combustion in a fire occurs in fractions of a second.
Rate=[A][B]²
= Ms⁻¹×M²s⁻²
= M³s⁻³
Therefore, M³s⁻³ is the units for the rate constant, , for the rate law, Rate=[A][B]².
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What did Nixon's visit to China prove to the US?
A. If you can deal with one communist nation, others will likely join in
B. The Soviet Union was close to falling apart and communism would leave Eastern Europe
C. Most communist nations actually practice capitalism and have free elections
D. The communist world was not a single entity, and had many different positions
Nixon's visit to China prove to the US that A. If you can deal with one communist nation, others will likely join in.
President Nixonvisit to ChinaThe 37th President of the United States (US) Richard Nixon is known for his resistance to the spread of the ideology of communism, especially that of the Soviet Union and China.
However, when there was a rift between the Soviet Union and China in the mid-1960s, US leaders including Nixon used this moment as an opportunity to overthrow communism.
The rift in relations stems from China's protest which considers Russia to have made a policy of counter-revolutionary diplomacy and reduced the expansion of the influence of communism, especially with the United States.
During a meeting with China in 1960, the Soviet Union reasoned that diplomacy with the US needed to be more fluid to avoid tensions, at a time when the two countries had nuclear weapons.
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which statement accurately describes a type of potential energy found in a container full of a chemical substance in liquid form?
The bonds between atoms are one place where potential energy is stored of potential energy found in a container full of a chemical substance in liquid form.
A chemical substance is a shape of matter having a steady chemical composition and feature residences. a few references add that chemical substances can't be separated into their constituent elements by way of bodily separation methods, i.e., without breaking chemical bonds.
A chemical substance is a form of count number having a constant chemical composition and characteristic properties. some references upload that chemical substances can not be separated into their constituent factors via physical separation strategies, i.e., without breaking chemical bonds. Chemical materials are factors, compounds, or mixtures: elements are just the one's materials that don't have any others as components. factors in this sense are the constructing blocks of chemical composition.
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The threshold frequency 0 describes the smallest light frequency capable of ejecting electrons from a metal.
Determine the minimum energy 0 of a photon capable of ejecting electrons from a metal with 0=5.43×1014 s−1.
What is the maximum kinetic energy electron of electrons ejected from this metal by light with a wavelength of 245 nm?
The minimum energy 0 of a photon capable of ejecting electrons from a metal with 0=5.43×1014 s−1 is 3.597 × 10⁻¹⁹ J. The maximum kinetic energy electron of electrons ejected from this metal by light with a wavelength of 245 nm is 6.46 × 10⁻¹⁹ J.
What is kinetic energy ?
The term kinetic energy is defined as the energy of motion, observable as the movement of an object or subatomic particle.
The formula for the minimum energy required to eject electrons from the metal that has the threshold frequency is;
E = hν
Where;
h is Planck's constant = 6.626 × 10⁻³⁴ J.s
ν is threshold frequency
So,
E = 5.43 × 10¹⁴ × 6.626 × 10⁻³⁴
E = 3.597 × 10⁻¹⁹ J
We can find the energy provided by the light using the Planck-Einstein equation. First, we need its frequency, which can be calculated from the following expression:
c = λ × ν
where,
c is the speed of light (3.00 × 10⁸ m/s)
λ is the wavelength
Then,
Let's call total energy T.
T = h . ν
= 6.63 × 10⁻³⁴ J . s × 1.28 × 10¹⁵ s⁻¹
= 8.49 × 10⁻¹⁹ J
From the total energy provided by the light (T), a part is used to eject the electron (E) and another part goes to the kinetic energy of the electron (K).
T = E + K
K = T - E
= 8.49 × 10⁻¹⁹ J - 2.03 × 10⁻¹⁹ J
= 6.46 × 10⁻¹⁹ J
Thus, the minimum energy 0 of a photon capable of ejecting electrons from a metal with 0=5.43×1014 s−1 is 3.597 × 10⁻¹⁹ J. The maximum kinetic energy electron of electrons ejected from this metal by light with a wavelength of 245 nm is 6.46 × 10⁻¹⁹ J
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Enter a formula for the compound that forms from strontium and chlorine
Express you’re answer as a chemical formula
ORGANIC CHEMISTRY
What would a chair conformation + a chair flip look like for the following molecules? :)
The chair conformation is obtained by a flip of the boat conformation.
What is the chair conformation ?In this conformation, the cyclohexane ring is bent into a chair-like shape, with alternating bonds in the ring adopting a "up" or "down" orientation.
The chair conformation is a very stable arrangement of bonds in cyclohexane, and it is the most common conformation observed in this type of molecule. The stability of the chair conformation is due to the fact that all of the bond angles in the ring are nearly tetrahedral, which is the preferred arrangement for carbon bonds. The chair conformation is also significant because it represents a compromise between the ring's need to minimize strain and its need to maintain its rigidity.
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a sample of ground beef contains 18.9% protein and 21.4% fat both by mass. how many kilocalories are in 125g of the ground beef? assume all kilocalories come from, protein and fat, and that the sample contains only protein, fat, and water
A sample of ground beef contains 18.9% protein and 21.4% fat both by mass. Therefore, 147.5kilocalories are in 125g of the ground beef.
What is calories?The calorie is an energy unit derived from the now-defunct thermodynamic theory of heat. Two primary meanings of "calorie" are widely used for historical reasons.
Originally, a big calorie, meal calorie, dietary calorie, and kilo calorie was defined as the quantity of heat required to increase the temperature with one kilogram of water through one degrees Centigrade (or one kelvin). The amount of heat required to create the same rise in one gram of water was characterized as a tiny calorie or gram calorie.
Let the required calorie of ground beef be m .
protein in it = .18m
fat in it = .21m
1 gram of protein gives 4 cals .
1 gram of fat gives 9 cals .
4 x .18m + 9 x .21m = 350
m = 147.5kilocalories
Therefore, 147.5kilocalories are in 125g of the ground beef.
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what is the concentration of H in a solution with ph 4? answer should be in units of M. do not round.
The concentration of hydrogen ions in a solution with a pH of 4 is [tex]1 x 10^-4 M.[/tex]
The pH of a solution is a measure of the acidity or basicity of the solution and is defined as the negative logarithm of the hydrogen ion (H+) concentration in the solution. The pH scale ranges from 0 to 14, with values less than 7 indicating an acidic solution and values greater than 7 indicating a basic solution. A neutral solution has a pH of 7.
To calculate the hydrogen ion concentration (in units of M) from the pH of a solution, the formula [tex][H+] = 10^-pH[/tex] can be used. For example, in a solution with a pH of 4, the hydrogen ion concentration can be calculated as [tex][H+] = 10^-4 = 1 x 10^-4 M[/tex]. This means that in a solution with a pH of 4, there is a concentration of [tex]1 x 10^-4 M[/tex] hydrogen ions present.
It's important to note that the pH of a solution can be used to determine the relative acidity or basicity of a solution, but it cannot be used to determine the actual amount of hydrogen ions or other species present in the solution. To determine the actual concentration of species in a solution, it is necessary to perform a quantitative analysis using techniques such as titration or spectrophotometry.
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The step-wise dissociation of selenous acid, H2SeO3 (aq), is represented by the equations above. Which of the following best helps explain why the value of Ka2 is so much smaller than the value of Ka1?
Removing the first H+ from H2SeO3(aq) requires less energy that the Removing the second H+, because the second H+ is removed from the Negatively charged species.
Find attached file of explanation of step-wise dissociation of selenous Acid, H2SeO3 (aq).
Reason: H2SeO3 is neutral molecule. Due to high electronegativity of O In O-H bond, it dissociates to release a proton.
But HSeO3-, is a negatively charged species and so, it is difficult to Abstract a proton from this ion. So, the value of Ka2 is so much smaller than the value of Ka1Ka2 is smaller.
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-- The given question is incomplete, did not get the complete question anywhere, so answer the question in general way. --
How many moles are in 2.64E^24 atoms of He?
Convert the number of atoms to moles. The Avogadro's constant, N, is 6.022 x 10^23 atoms/mole.
So, the number of moles is given by:
(2.64 x 10^24 atoms) / (6.022 x 10^23 atoms/mole) = (2.64 x 10^24 atoms) / 6.022 x 10^23 moles/atom
= 4.4 moles
Therefore, there are 4.4 moles in 2.64 x 10^24 atoms of He.
What are atoms?The smallest piece of stuff that still possesses an element's characteristics is an atom. Protons, neutrons, and electrons are the three different sorts of particles that make them up. The nucleus, or core, of an atom, is made up of protons and neutrons, with electrons revolving around it. What element the atom depends on how many protons are in the nucleus. All matter in the cosmos is made up of molecules, which are created when atoms join together to form bonds. Atoms can also disintegrate into smaller forms of matter or react chemically with other atoms to create new substances. Modern chemistry and physics both depend critically on our understanding of atoms and how they interact with one another.
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how many molecules are in 1.64 moles of Br2?
The number of molecules in a certain number of moles can be calculated by multiplying the number of moles by Avogadro's number, which is approximately equal to 6.022 x [tex]10^{23}[/tex].
So, for 1.64 moles of Br2, the number of molecules would be:
1.64 moles × 6.022 x [tex]10^{23}[/tex] molecules/mole = 9.937 x [tex]10^{23}[/tex] molecules
Therefore, 1.64 moles of Br2 would contain approximately 9.937 x [tex]10^{23}[/tex] molecules.
What is Avogadro's number?The number of atoms, ions, or molecules in one mole of a substance is a key constant in chemistry. Named for the Italian scientist Amedeo Avogadro, it has a definition of 6.02214076 x [tex]10^{23}[/tex] particles per mole. Based on a sample's mass or molar quantity, this number is used to determine the number of atoms, ions, or molecules present. It is crucial for figuring out chemical reactions, putting chemical amounts into perspective, and figuring out how many particles are in a sample. The proportionality factor that connects the number of constituent particles in a sample with the amount of substance in that sample is called the Avogadro constant, often known as NA or L.
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Write correct ionic formulas for the following light emitting compounds by entering subscripts (remember that number of electrons that are given away has to be equal to the number of electrons that are accepted). if there is only one ion, then enter number 1.
A cation's name, symbol, and charge must be noted in order to determine the ionic compound's formula.The symbols for sodium and oxygen are respectively Na+ and O2.Na2O is the resultant substance.
What is the ionic formula ?A cation's name, symbol, and charge must be noted in order to determine the ionic compound's formula.Determine the anion's identity after which you should note its symbol and charge.Create an electrically neutral substance by combining the two ions.For ionic compounds, write a formula.Cation is on the left and anion is on the right. Write out the ions.Divide the charge by the number.Make subscripts out of the crossed-out numbers.Simplify if necessary.The symbols for sodium and oxygen are respectively Na+ and O2.Na2O is the resultant substance.To learn more about ionic formula refer
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15ml of 0.01m hcl is mixed with ml of 0.01m naoh. drag the appropriate quantities into the boxes to set up an equation that could be used to solve for the temperature change of the solution.
The equation for the temperature change of the solution when 15 ml of 0.01 M HCl is mixed with ml of 0.01 M NaOH is:
HCl + NaOH → NaCl + H2O
ΔT = (nHCl x ΔHCl) + (nNaOH x ΔNaOH)Where nHCl is the amount of moles of HCl and ΔHCl is the molar heat of reaction of HCl, and nNaOH is the amount of moles of NaOH and ΔNaOH is the molar heat of reaction of NaOH.
The temperature change of a solution is determined by the amount of heat energy it absorbs or releases during a reaction. For example, when a solute dissolves in a solvent, it can cause the temperature of the solution to rise or fall.
This is because the solute absorbs or releases heat energy in order to break the intermolecular forces between the solvent molecules and the solute molecules. Additionally, when two solutions are mixed, their temperatures may change due to endothermic or exothermic reactions.
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Calculate the pOH of a 0.2 m hcl solution?
The pOH of a 0.2 m HCl solution is 13.3.
What is concentration?Concentration is the ability to focus on a particular task or activity, blocking out distractions and using cognitive resources efficiently. It is a key factor in achieving success in any area, whether it be in school, the workplace, sports, or leisure activities. Concentration requires a person to be able to pay attention to a specific task over a long period of time, while blocking out irrelevant or competing stimuli.
It also involves the ability to sustain focus and effort, even when faced with challenging or tedious tasks. Developing concentration skills can be beneficial in many aspects of life, including improved academic performance, increased productivity, better decision-making, and better problem-solving skills. Practicing mindfulness, taking regular breaks, and organizing tasks can all help to improve concentration.
pH=-log10[H+]
pH=-log10[0.2]
pH=0.7
You can then enter this into the equation
pH + pOH = 14
placing our pH value into this we get
0.7 + pOH = 14
You can rearrange this to find
pOH = 14–0.7
which means
pOH=13.3
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A male client visits a health centre and reports that he is 5 feet 10 inches tall. Compute his ideal
body weight using Hamwi predictions imperial and metric and BMI predictions.
a. If the client actually weighs 164 lbs comment on his weight and the finding
Match each property of a liquid to what it indicates about the relative strength of the intermolecular forces in that liquid:Strong intermolecular forces, Weak intermolecular forceshigh vapor pressurehigh surface tensionhigh viscosityhigh boiling point
The answer is 1) high vapor pressure = weak IMF, 2)high surface tension = strong IMF, 3) high viscosity = strong IMF, 4) high boiling point = strong IMF.
The strength of the intermolecular forces (IMF) is directly related to the boiling point of the compound. The higher the boiling point, the stronger the IMF. This is because a stronger IMF requires more energy to separate them, resulting in a higher boiling point.
The strongest IMFs involved in determining the boiling point of a compound are London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonding.
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using only your equation sheet, calculate the change in entropy of water when it freezes at its normal freezing point. use units of j/mol k.
When water freezes at its typical freezing point, its entropy changes to [tex]-22.08 J/mol K[/tex].
Entropy is a metric for how chaotic or unpredictable a system is. The quantity of energy in a thermodynamic system that is not usable for work is measured using this notion, which is utilised in thermodynamics and statistical mechanics. It is frequently referred to as the system's level of chaos or disorder.The change in entropy of water at its normal freezing point is given by the expression:
ΔS = -ΔH/T
Where ΔH is the enthalpy of fusion of water, which is 6.01 kJ/mol, and T is the freezing point of water, which is 273.15 K.
The change in entropy of water when it freezes at its normal freezing point is:
ΔS = [tex]\frac{-6.01 kJ/mol }{ 273.15 K}[/tex]
ΔS = [tex]-22.08 J/mol K[/tex]
Therefore, The change in entropy of water when it freezes at its normal freezing point is:-22.08J/molK
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A hot tub is filled with 450 gal of water and is heated to 105 °F. How many kilocalories are needed to heat the water from 62.0 oF to 105.0 oF? The specific heat ofwater is 4.184 J/g oC
The amount of heat required to raise the temperature of the system through 1°C is defined as the heat capacity of the system. The kilocalories of heat needed to heat the water from 62.0 °F to 105.0 °F is 40877.01.
What is specific heat capacity?The quantity of heat required to raise the temperature of one gram of the substance through 1°C is known as the specific heat capacity. It is usually denoted by c.
The equation connecting the specific heat capacity with the heat is given as:
q = mc (T₂ - T₁) = mc Δ T
1 gallons = 3.785 L
450 gallons = 450 × 3.785 = 1703.25 L
Density of water is 1 g/cm³
Then the mass of water is, m = Density × Volume
m = 1703.25 L × 1000 mL/ 1L × 1.0 g / 1mL × 1kg / 1000g
m = 1703 .25 kg
The temperature in °F can be converted into °C as:
T°C = T°F - 32 / 1.8
T₁ = 62 -32 / 1.8 = 17°C
T₂ = 105 - 32/ 1.8 = 41°C
Δ T = T₂ - T₁ = 41 - 17 = 24°C
q = 1703.25 kg × 4.184 kJ/kg K × 24°C
q = 171033.552 kJ
1 kilojoule = 0.239 kilocalorie
171033.552 kJ = 40877.01 kilocalorie
Thus the heat required in kilocalorie is 40877.01.
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How many grams of sucrose, C12H22O11, (MM= 342.3 g/mol), must be added to 537 g of water to give a solution with a vapor pressure 0.513 mmHg less than that of pure water at 20°C? The vapor pressure of water at 20°C is 17.5 mmHg
There has to be 1.87 g of sucrose to be added to 537 g of water to make a solution with the specified vapor pressure.
Vapor Pressure Sucrose Solution
The vapor pressure of a solution is related to the concentration of solute particles in it. The decrease in vapor pressure, ΔP, is proportional to the molality of solute, m, in the solution: ΔP = -kPm, where k is a constant and P is the vapor pressure of pure water.
Since the vapor pressure of the solution is 0.513 mmHg less than that of pure water, we can write:
17.5 mmHg - 0.513 mmHg = 17.0 mmHg = -kP * m
Rearranging and solving for m, the molality, we have:
m = - ΔP / (kP) = 0.513 mmHg / (17.5 mmHg) = 0.0293 mol/kg.
We can then use the molality to find the amount of solute (sucrose) in grams needed to make the solution:
m = 0.0 293 mol/kg = 0.0 293 mol / (537 g) = 5.47 x 10^-5 mol
Finally, using the molar mass of sucrose, we can find the number of grams of sucrose needed:
5.47 x 10^-5 mol * 342.3 g/mol = 1.87 g.
So, 1.87 g of sucrose must be added to 537 g of water to make a solution with the specified vapor pressure.
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If 2.1 moles of zinc react with 6.0 moles of hydrochloric acid in the equation Zn + 2HCl → ZnCl2 + H2, what is the limiting reactant?
Zn
HCl
ZnCl2
H2
The limiting reactant in the given equation [tex]Zn + 2HCl \rightarrow ZnCl_2 + H_2[/tex] is Zn. The correct answer is option A.
The limiting reactant, also known as the limiting reagent, is the substance that is completely consumed or in a chemical reaction, thereby determining the maximum amount of product that can be formed.
To determine the limiting reactant, we need to compare the stoichiometric ratios of the reactants to see which one will be completely consumed first.
In the balanced equation, the stoichiometric ratio between zinc (Zn) and hydrochloric acid ([tex]HCl[/tex]) is [tex]1:2[/tex], meaning that one mole of Zn reacts with two moles of [tex]HCl[/tex].
Given that,
we have 2.1 moles of Zn and 6.0 moles of [tex]HCl[/tex], we can calculate the number of moles of [tex]HCl[/tex] needed to react with 2.1 moles of Zn by multiplying 2.1 moles of Zn by the stoichiometric ratio:
2.1 moles Zn[tex]\times[/tex] (2 moles [tex]HCl[/tex]/ 1 mole Zn) = 4.2 moles HCl
Since, we have 6.0 moles of [tex]HCl[/tex], which is greater than the 4.2 moles required to react with 2.1 moles of Zn, [tex]HCl[/tex] is present in excess.
Therefore, the limiting reactant in the given equation [tex]Zn + 2HCl \rightarrow ZnCl_2 + H_2[/tex] is zinc (Zn), as it will be completely consumed before all the [tex]HCl[/tex] can react. Option A is the correct answer.
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What mass of iron(II) sulfate would be needed to provide 28 grams of iron?
Answer:
Explanation:
one half mole or 76 grams of Iron (II) Sulfate.
A student dissolves 15.g of styrenein (C8H8) in 250 mL of a solvent with a density of 0.88g/mL. The student notices that the volume of the solvent does not change when the styrene dissolves in it.Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits.
The molar mass of styrene (C8H8) is 104 g/mol, when a student dissolves 15.g of styrenein (C8H8) in 250 mL of a solvent with a density of 0.88g/mL.
To calculate the molarity of a solution, you must divide the number of moles of solute (styrene) by the volume (liters) of the solution: 1438 mol ÷ 0.
25 L = 0.5752 M = 0.58 M (rounded to two significant figures)
To calculate the molarity of a solution, divide the number of moles of solute by the mass of solvent in grams.
0.1438 mol ÷ 250 g = 0.0005752 mol/g = 0.
00058 mol/g (rounded to 2 significant figures
A student dissolved 15 g of styrene (C8H8) in 250 ml of solvent with a density of 0.88 g/ml. Styrene has a molar mass of 104 g/mol, so the number of moles of solute is 15 g ÷ 104 g/mol = 0.1438 mol The molarity of the solution is zero.
1438 mol ÷ 0.25 L = 0.58 M. Molarity is calculated as 0.1438 mol ÷ 250 g = 0.
00058 mol/g. Both molarity and molarity are measures of concentration and indicate the amount of solute in a solution.
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what charge is expected for the following elements in ionic compounds--be, mg, ca, sr, ba, ra, zn, and cd?
Electron configurations written down. The energy level (the period) should come first when writing an electron configuration, followed by the subshell that needs to be filled and the superscript.
What do the letters 1s, 2s, and 3p mean?The energy levels of the electronic orbitals are 1s 2s 2p 3s 3p. Due to the fact that one atom can have numerous electronic orbitals, energy levels are classified as particular quantum numbers: 1s, 2s, 3s, 4s, 3d, 4p, 5s, 4d, 5p 7s 5f 6d 6p 4f 5d 6p. The orbital angular momentum quantum number, indicated by l, can be understood.
Let's list the elements that have changed. The following is anticipated
Every stable electron configuration element gains the maximum D- Te Te +2 2- Po Pot2 +2 se se Hele as well as all other elements. Be Be 12 нд Mg+2 2n+2
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