I've been stuck on a homework problem for a while now. Can someone help me get to the answer?

An acid has a Ka of 2.9 x 10^-6. For 100 mL of a 0.2 M acid solution being titrated with a 0.05 M NaOH solution, determine the pH after the following volumes of the NaOH solution are added. SHOW ALL WORK.
A. 9mL
B. 100 mL
C. 400 mL
D. 500 mL

Don't use ChatGPT, I can tell if you do, please.

Answer:

9.370 x 10 to the 23 molecules

Explanation:

91.72/1 x 1 mole Co/58.933g x 6.02 x 10 to the 23/1 mole Co

Answer:

Explanation:

Mass 1 mole of CO

C = 12

O = 16

m = 28

Mols of 91.72 grams

m = given Mass / Molar Mass

m = 91.72 / 28

m = 3.28 mols

Molecules

1 mol of anything is 6.02 * 10^23 molecules (in this case)

3.28 mol of CO = x

1/3.28 = 6.02*10^23/x      Cross multiply

x = 3.28 * 6.02 * 10^23

x = 1.97 * 10^24

Answer:

The radiation of the Sun's electromagnetic waves

Explanation:

Earth's atmosphere keeps much of the Sun's energy from escaping into space. This process, called the greenhouse effect, keeps the planet warm enough for life to exist.

Answer:

32 atoms

Explanation:

An element with just is a letter is represented as 1 atom

An element with a number after it shows how many atoms (not one atom) is of that element.

I'm not sure if the (6)'s are trying throw you off.

Answer:

Star's

Explanation:

Stars have their own brightness

Answer:

first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.

Explanation:

Hi! In an organic redox reaction, you can indeed identify the reduced and oxidized organic molecules by monitoring the charges between the reactants and products. In a redox reaction, there is a transfer of electrons between molecules, leading to a change in their oxidation states. To understand this better, let's break down the two processes involved in a redox reaction: reduction and oxidation.

Reduction corresponds to a gain of electrons by a molecule, causing a decrease in its oxidation state. This means that the reduced molecule becomes more negatively charged or less positively charged. In organic reactions, reduction often involves the addition of hydrogen atoms or the removal of oxygen atoms.
On the other hand, oxidation corresponds to a loss of electrons by a molecule, resulting in an increase in its oxidation state. This causes the oxidized molecule to become more positively charged or less negatively charged. In organic reactions, oxidation typically involves the removal of hydrogen atoms or the addition of oxygen atoms.
To recognize the reduced and oxidized organic molecules in a redox reaction, follow these steps:
1. Determine the oxidation state of each atom in the reactants and products.
2. Identify any changes in the oxidation state between the reactants and products.
3. The molecule with a decreased oxidation state has undergone reduction (gained electrons).
4. The molecule with an increased oxidation state has undergone oxidation (lost electrons).
By tracking these changes in oxidation states and charges, you can easily recognize the reduced and oxidized organic molecules in a redox reaction.

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According to the graph, the concentration of A decreases with time before leveling out. Option A.

The reaction shown is that of a reversible reaction in which A is on the reactant's side and A2 is on the product's side.

At the beginning of the reaction, the concentration of A decreases as a result of forming A2. In other words, the concentration of A2 increases just as that of A decreases.

With time, the reaction reaches an equilibrium during which the rate of formation of A equals the rate of formation of A2. At this point, the concentration of A levels off.

In summary, the concentration of A first decreases before leveling off.

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Answer:

+3

Explanation:

The anion in aluminum nitrate is nitrate (NO3-), which has a valency of -1. The cation in aluminum nitrate is aluminum (Al^3+), which has a valency of +3.


ALLEN

Answer:

its 150 hope this helps

Explanation:

To create a polyester via condensation polymerization, several chemicals are required. These include a dicarboxylic acid, a diol, and a catalyst.

Dicarboxylic acid is an organic compound that contains two carboxylic acid groups, while a diol is a compound containing two hydroxyl groups. Both of these compounds are necessary to form the ester bond that creates polyester.

Additionally, a catalyst is required to facilitate the reaction between the dicarboxylic acid and diol. Other compounds such as an amine, a diamine, an alcohol, and a carboxylic acid may also be used, but they are not necessary for the reaction to occur.

Overall, the condensation polymerization process requires the combination of at least two compounds containing reactive groups, which form a polymer through a reaction that releases a small molecule such as water.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question we have

\(volume = \frac{50}{0.785} \\ = 63.694267...\)

We have the final answer as

Hope this helps you

Answer:

Answers are C, D

Explanation:

Solid particles always stick together no matter what happens unless it is changing into a liquid. If you are talking about vibration for solid particles that only applies to thermal vibratio so not A. They do not slide past each other because they are packed very tightly together. They have a definite shape and volume because they stay together unless facing heat. Hopefully this helps you :)

pls mark brainlest ;)

The statements about the particles present in her model that are true;

C and D

Particles of solids are closely packed and this feature distinguishes a solid from other forms of matter ( liquid and gas ). Solids have a definite volume and shape due to their closely packed particles.

Vibration in solids occur when solids are under thermal pressure and from her skating activity, there was no form of thermal pressure therefore solids vibrating in place would not be included in her model.

Hence we can conclude that The statements about the particles present in her model that are true; they are packed very closely together and  They cause the solid to have a definite volume and definite shape

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Answer:

81.3 a

Explanation:

Just search up answers on wolframalpha.com

Answer:

1. Independent variables: temperature, distance, concentration gradient

Dependent variables: The water and food dye because it is being used to measure the rate of diffusion

2. The tube with a higher temperature would have a higher rate of diffusion than a tube with a lower temperature because introduction of heat helps the particles move farther and faster apart

3. A controlled variable can be the amount of food dye used in each tube so you can record an accurate rate of which the food die gets diffused.

Answer:

Explanation:

Independent variables: temperature, distance, concentration gradient

Dependent variables: The water and food dye because it is being used to measure the rate of diffusion

2. The tube with a higher temperature would have a higher rate of diffusion than a tube with a lower temperature because introduction of heat helps the particles move farther and faster apart

3. A controlled variable can be the amount of food dye used in each tube so you can record an accurate rate of which the food die gets diffused.

Nuclear magnetic resonance spectroscopy (NMR) is used to study the electronic environment of atoms and the bonding nature of a compound.

The number of different signals observed in the 1H NMR spectra of the given compounds are as follows: Compound A: 10 signals, Compound B: 6 signals ,Compound C: 4 signals Compound D: 6 signals ,Compound E: 9 signals, Compound F: 3 signals

In proton nuclear magnetic resonance spectroscopy (1H NMR), the magnetic field strength and electronic environment of the protons influence the chemical shifts. The shielding effect or deshielding effect of the nearby atoms, bond length, and bond angle, among other factors, all influence the chemical shifts. There are five different types of proton environments, which correspond to five different chemical shifts, in this case: Type 1: Hydrogen atoms that are covalently bonded to sp3 hybridized carbons. Type 2: Hydrogen atoms that are covalently bonded to sp2 hybridized carbons. Type 3: Hydrogen atoms that are covalently bonded to sp hybridized carbons. Type 4: Hydrogen atoms that are covalently bonded to aromatic carbons. Type 5: Hydrogen atoms that are directly bonded to electronegative elements such as nitrogen, oxygen, or halogens.

Here, to determine the number of signals expected in the 1H NMR of the compounds. Compound A: 10 different proton environments => 10 signals. Compound B: 6 different proton environments => 6 signals. Compound C: 4 different proton environments => 4 signals. Compound D: 6 different proton environments => 6 signals. Compound E: 9 different proton environments => 9 signals. Compound F: 3 different proton environments => 3 signals.

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The appropriate model of the radioactive decay of a group of atoms is popping a bag of popcorn.

The key thing that we must keep in mind is that the radioactive process is "irreversible". This means that we can not turn the process around on it occurs. If it happens, then it is final.

The model that must choose must accurately reflect this observation. The only model that comes close to this is popping a bag of popcorn.

Hence, popping a bag of popcorn is the appropriate model of the radioactive decay of a group of atoms.

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Answer:

popping a bag of popcorn

Explanation:

I just did it

Answer:

3 mole

Explanation:

2 moles of Ag give 1 mole of Mg(NO3)2

5 moles of Ag will give 5×1÷2 of Mg(NO3)2

=2•5 =3

The answer of the mathematical operation to the correct number of significant figures is 1.71x10⁻⁴

The answer of the mathematical operation to the correct number of significant figures is 7.2

The no of significant figures in the answer depends on the no of significant figures in the problem given.

It is given 1.05x10⁻³/6.135 , so the number of significant figures in 1.05x10⁻³ is 3 and in 6.135 is 4. So the answer of this operation will be rounded off to have 3 significant figures only. Since the calculated amount comes out as 0.17114x10⁻³. But it has to be rounded to 4 significant figures. So the answer will be 1.71x10⁻⁴

It is given 21-13.8 , so the number of significant figures in the operation are 2 and 3 respectively. So the calculated amount comes to be 7.2 and it already has 2 significant figures.

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Answer:

chemical change

Explanation:

electrolysis process by which electric current is passed through a substance to effect a chemical change.

Answer:

.

Answer: 5 All of the molecules have the same kinetic energy

since the temperature is kept constant at 298 K

Explanation:

The AVERAGE kinetic energy is directly proportional to the absolute temperature.

All the molecules have the same average kinetic energy as average kinetic energy is directly proportional to the absolute temperature. So, the correct option is 5.

The average kinetic energy (K) is equal to one-half of the mass (m) of each gas molecule times the root mean square speed (Vrms) squared.

We know that the average kinetic energy is directly proportional to the absolute temperature.

All of the molecules have the same kinetic energy since the temperature is kept constant at 298 K.

Therefore, All the molecules have the same average kinetic energy as average kinetic energy is directly proportional to the absolute temperature.

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According to Newton’s second law, why does it become more difficult to move the planter? The three statements that apply are listed below:Newton's second law states that force is proportional to mass and acceleration. An object's acceleration is directly proportional to the force acting on it and inversely proportional to its mass.

This means that it's difficult to move the planter because of its mass.The three statements that apply are:The force required to move an object increases as its mass increasesThe amount of force that is applied to an object is directly proportional to its accelerationThe mass of the object is directly proportional to the amount of force required to move it.

As we know, that Nikhil pushed the planter around the living room and after he watered it, he found it difficult to push the planter. This happened because the water added extra mass to the planter, which caused the force required to move it to increase. Hence, according to Newton's second law, the difficulty to move the planter

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For the reaction 2CO2(g) ⇌ 2CO(g) + O2(g) at 1200K, the equilibrium constant K is given as\(1.00 * 10^-13\). The equilibrium lies far to the left (option d).

The equilibrium constant K for the reaction 2CO2(g) 2CO(g) + O2(g) at 1200K is reported as \(1.00 * 10-13\). (Option d) The equilibrium is located far to the left.

This is because a small value of K (much less than 1) indicates that the reaction favors the formation of reactants over products. In this case, there will be a significantly higher concentration of CO2 compared to CO and O2 at equilibrium.

The equilibrium constant, or Kc, is a number that indicates how far a chemical reaction has progressed towards equilibrium. It is described as the ratio of the product concentrations to the reactant concentrations, each elevated to the stoichiometric coefficients that correspond to them. With bigger values indicating that the equilibrium lies more towards the products and lower values showing that it lays more towards the reactants, the magnitude of Kc represents the relative amounts of reactants and products present at equilibrium. The system's temperature and pressure have an impact on the precise value of Kc for a given reaction.

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Answer:

1.89

Explanation:

238cal = J joules

450cal = xJ joules

\( \frac{450}{238} = \frac{xj}{j} \)

1.89 = x

450cal = 1.89J joules

The correct answer is (c) SO3.

The empirical formula shows the simplest possible ratio of elements present in a compound. By converting the given percentages of S and O into their corresponding mass, then dividing the mass by their respective atomic masses, the mole ratio between S and O atoms in the compound can be found. That mole ratio can be expressed as a whole number ratio and used to determine the empirical formula.

For the given percentages, we can find the empirical formula of the compound as follows:

a) The mass of sulfur in a 100 g sample of the compound is 40.05 g, and the mass of oxygen is 59.95 g. Using the atomic masses of sulfur and oxygen (32.06 g/mol and 15.99 g/mol, respectively), we can find the number of moles of each element in the compound: moles of S = 40.05 g / 32.06 g/mol = 1.249 moles moles of O = 59.95 g / 15.99 g/mol = 3.747 moles To find the simplest whole number ratio between S and O atoms, we divide each value by the smaller one: moles of S / 1.249 = 1 moles of O / 1.249 = 3Therefore, the empirical formula is SO3.

b) To find the empirical formula for S02, we would need to have the percentage composition by mass of the elements in that compound. The given percentages of 40.05% S and 59.95% O do not correspond to the compound S02.

c) Similarly, the given percentages do not correspond to SO4 either. d) The given percentages do not correspond to S04 either.

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Answer:

more

Explanation:

seems like you did not finish the questions

Answer:

The right option is; an experimental investigation, because it allows for the control of variables.

Explanation:

First, we must know Avogadro's number:

1 mol of any substance = 6.02x10^23 formula units (ions, atoms, molecules, etc)

Also, we can say this:

1 mol of Li2O = its mass expressed in grams

(from Li2O molar mass = 30 g/mol approx.)

Now,

1 mol Li2O = 30 g = 6.02x10^23 molecules Li2O

30 g Li2O ----------- 6.02x10^23 molecules Li2O

x ----------- 2.8x10^24 molecules Li2O

x = 140 g approximately

Answer: 140 g

Answer:

Shifts to the left.

Shifts to the right.

Explanation:

Based on Le Châtelier's principle, when a change occurs in a system in equilibrium, the system will try to counteract the change that was made.

In the equilibrium:

2NO (g) + H₂ (g) ⇌ N₂O (g) + H₂O (g) + 36 kJ (heat)

If N₂O is added, the equilibrium shifts to the left trying to decrease the concentration of N₂O added.

If H₂ is added, the equilibrium shifts to the right trying to decrease the concentration of H₂ added

To determine how many grams of a 150-gram sample will remain radioactive after 45 minutes, we need to consider the decay rate and the decay constant of the substance. The decay rate is given as 0.064 per minute, which means that 0.064 units of the substance decay per minute. After calculations, it is found that approximately 132.07 grams of the original 150-gram sample will still be radioactive after 45 minutes.

The decay constant (λ) is related to the decay rate by the equation: decay rate = λ * initial amount.

In this case, the initial amount is 150 grams. So we can rearrange the equation to solve for λ: λ = decay rate / initial amount.

λ = 0.064 / 150 = 0.0004267 per gram.

Now, we can use the decay constant to calculate the remaining amount of the substance after 45 minutes using the equation: remaining amount = initial amount * exp(-λ * time).

Remaining amount = 150 * exp(-0.0004267 * 45).

Calculating this expression, we find that approximately 132.07 grams of the 150-gram sample will remain radioactive after 45 minutes.

Therefore, approximately 132.07 grams of the original 150-gram sample will still be radioactive after 45 minutes.

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