Select the correct answer.

How is the enthalpy of reaction shown in this potential energy diagram?

A.
as the sum of the energy of the products and the energy of the reactants
B.
as the sum of the activation energy and the energy of the products
C.
as the difference of the energy of the reactants and the energy of the products
D.
as the difference of the activation energy and the energy of the products

Answer:

B. It undergoes phase change.

Explanation:

Answer:

1 K3PO4 +3 HCI -->3 KCI +1 H3PO4

Explanation:

K3PO4- 1

use law of conservation mass .

In a chemical reaction mass is neither created nor destroyed.

Hence Mass of reactants=Mass of products.

Mass of Product:-

\(\\ \sf\longmapsto 7.5+24.4\)

\(\\ \sf\longmapsto 31.9g\)

Answer:

the answer is B

hope this helped!

Answer:

The key difference between atomic mass and average atomic mass is that the atomic mass is the mass of an atom, whereas the average atomic mass is the mass of an atom of a particular chemical element calculated by considering isotopes of that element.

Explanation:

Answer:

negative ion

Explanation:

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Answer:

B

Explanation:

The geometry of the BF3 molecule is called trigonal planar

Answer:

bf3 is a trigonal shape

Explanation:

no.of pairs = v+m-c+a/2

then it ' ll get 3

so sp2 hybridization

sp2 is a trigonal planar

Answer:

Explanation:

101 m/ 66 s = 1.53 m/s

Answer:

Explanation:all

This is a stoichiometry problem, where we have an initial amount of reactant and we need to find out how much of the product will we end up with, in order to do that we need to:

1. Set up the properly balanced equation, which the question already provided us

2 H2 + O2 -> 2 H2O

2. See how many moles of reactant there are in the given amount of grams, we will do that by using the molar mass of O2, 32g/mol

32g = 1 mol

64g = x moles

x = 2 moles of O2 in 64 grams

3. Check the molar ratio between the two compounds, according to the reaction, the mole ratio is 1 O2 to 2 H2O, mole ratio 1:2, which means if we have 2 moles of O2, we will produce 4 moles of H2O

4. Calculate how many grams will be equal to the number of moles that we found out, using the molar mass of H2O, 18g/mol

18g = 1 mol

x grams = 4 moles of H2O

x = 72 grams of H2O are produced from 64 grams of O2

Answer:

The most abundant chemical/gas is Nitrogen, which makes up about 78% and Oxygen at second place with approximately 21%

Answer:

Nitrogen and Oxygen because about 70% of air is nitrogen and around 20% of air is Oxygen.

Hope this helps!

Yes, all of these energy sources can cause a turbine to generate electrical energy.

Energy source is an entity or substance that provides energy, typically in the form of electricity, heat, or fuel. This energy can be used to provide light, motion, heat, and to power machinery, among other things. Examples of energy sources include fossil fuels such as coal and natural gas, renewable sources such as solar, hydro, and wind power, and nuclear sources such as uranium and thorium. Energy sources can be used for many different applications, from powering vehicles to providing heat and light for homes and businesses.

A tea kettle or faucet can generate steam to power a turbine, a bicycle can provide mechanical energy to spin the turbine, and solar energy can be converted into electricity by a solar panel and used to power a turbine.

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Answer:

Explanation:

pOH = -log1.36 X 10^-10 = 9.87

pH = 14-pOH = 14-8.97 = 5.03

This kind of matrix composite is renowned for strengthening the dispersive material's resistance to fracture. metals, ceramics, and polymers.

Ceramic matrix composites (CMC) are substances made of both ceramic and composite components.It consists of two parts: a matrix that holds the material together and a reinforcement that gives the material its tensile strength. When ceramic matrix composites have a scattered phase, it is primarily because the material's toughness has increased, which has increased the tensile strength.

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Answer:

92.9 I think not sure but hope this helps

Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. Electron configuration of O²⁻ is 1s² 2s² 2p⁶.

Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.

Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

The electron configuration of O²⁻ is 1s² 2s² 2p⁶. It is also known as noble gas like configuration.

Therefore, electron configuration of O²⁻ is 1s² 2s² 2p⁶.

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Answer:

125

Explanation:

Answer:

1.47 g

Explanation:

The correct answer for emperical and molecular formula = C5H14N2 .

3.23 g x (12.011 / 44.0098) = 0.8815 g carbon

1.865 g x (2.016 / 18.0152) = 0.2087 g Hydrogen

1.58 g x (28.014 / 108.009) = 0.4098 g Nitrogen

1.50 g minus (0.8815 + 0.2087 + 0.4098) = 0.

Convert each element's mass to moles.

0.8815 g/12.011 g/mol = 0.0734 mol carbon

0.2087 g 1.008 g/mol = 0.207 mol Hydrogen

0.4098 g 14.007 g/mol = 0.02926 mol Nitrogen

Step three is to calculate the ratio of molar amounts expressed in the smallest, whole numbers.

0.0734 mol 0.02926 mol = 2.51 carbon

7.07 mol hydrogen = 0.207 mol 0.02926 mol

Nitrogen: 0.02926 mol = 1 Nitrogen: 0.02926 mol = 1

Doubling each value yields C = 5, H = 14.14, and N = 2, resulting in the empirical formula C5H14N2. 

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There are 0.161 moles of copper atoms in a 25.7 g sample of CuSO4.

To determine the number of moles of copper atoms in a sample of CuSO4, we first need to know the molar mass of CuSO4.

The molar mass of CuSO4 can be calculated by adding the atomic masses of copper, sulfur, and four oxygen atoms:

1 x Cu = 63.55 g/mol

1 x S = 32.06 g/mol

4 x O = 15.99 g/mol x 4 = 63.96 g/mol

Molar mass of CuSO4 = 63.55 g/mol + 32.06 g/mol + 63.96 g/mol = 159.57 g/mol

Now that we know the molar mass of CuSO4, we can use it to calculate the number of moles of copper atoms in a 25.7 g sample:

moles of Cu atoms = mass of CuSO4 / molar mass of CuSO4

moles of Cu atoms = 25.7 g / 159.57 g/mol

moles of Cu atoms = 0.161 moles

Therefore, there are 0.161 moles of copper atoms in a 25.7 g sample of CuSO4.

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The equivalence point in a titration curve : the correct options are :

The equivalence point in the curve is the point when the amount of the titrant added is just proper to neutralize the analyte solution completely. in the acid base titration the equivalence point is equal s to the moles of the acid and solution will contains the water and the salt only. in the chemical reaction the equivalence point is the point when chemically equal amount of reactants have been mixed.

Thus, one mole of OH⁻ has been added for each mole of monoprotic acid.

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It is the 4th scenario is the dependent event. There are 7 gold tokens and 4 silver tokens in a cup. The first student randomly draws a gold token and keeps it. A second student randomly draws a gold token from the cup.

The fouth scenario is a dependent event because the probability of the second student drawing a gold token is affected by the outcome of the first student's draw.

If the first student draws a gold token, then there are only 6 gold tokens left in the cup, the probability changes. but  if the first student does not draw a gold token, then there are 7 gold tokens left in the cup, the probability will remain the same

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The solubility of\(LaF_3\) in water is 3.04 x 10^-6 mol/L.

The solubility of \(LaF_3\) in water can be determined using the Ksp expression:

\(Ksp = [La^{3+}][F^-]^3\)

Where \([La^{3+}]\)and \([F^-]\) are the molar concentrations of the \(La^{3+}\) and \(F^-\) ions in the solution.

Since each \(LaF_3\) formula unit dissociates into one \(La^{3+}\) ion and three \(F^-\) ions, the molar solubility of \(LaF_3\) can be represented as x. Thus, the molar concentrations of \(La^{3+}\) and \(F^-\) ions in the solution can be written as x and 3x, respectively.

Substituting these values into the Ksp expression gives:

Ksp = x*(3x)^3 = 27x^4

Now, we can solve for x:

x = (Ksp/27)^(1/4)

= (2 x 10^-19 / 27)^(1/4)

= 3.04 x 10^-6 mol/L

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Answer:

0.101 M

0.1 mol/kg

0.644

Explanation:

To calculate the molarity, molality, and mole fraction of Na2SO4 in a solution, you need to know the moles of Na2SO4 in the solution and the volume or mass of the solution.

A) Molarity: Molarity (M) is defined as the number of moles of solute per liter of solution. To calculate molarity, we need to divide the number of moles of Na2SO4 by the volume of the solution in liters.

First, calculate the number of moles of Na2SO4:

mass of Na2SO4 = 755 g

molecular weight of Na2SO4 = 142 g/mol

number of moles = mass/molecular weight = 755 g / 142 g/mol = 5.34 moles

Next, calculate the volume of the solution:

mass of water = 53,100 g

density of water = 1 g/mL

volume of water = mass/density = 53,100 g / 1 g/mL = 53,100 mL = 53.1 L

Finally, calculate the molarity:

molarity = number of moles / volume of solution = 5.34 moles / 53.1 L = 0.101 M

B) Molality: Molality (m) is defined as the number of moles of solute per kilogram of solvent. To calculate molality, we need to divide the number of moles of Na2SO4 by the mass of the solvent in kilograms.

mass of water = 53,100 g

mass of solvent in kilograms = mass in grams / 1000 g/kg = 53,100 g / 1000 g/kg = 53.1 kg

Finally, calculate the molality:

molality = number of moles / mass of solvent = 5.34 moles / 53.1 kg = 0.1 mol/kg

C) Mole fraction: The mole fraction (X) is defined as the ratio of the number of moles of solute to the total number of moles of solute and solvent in a solution. To calculate the mole fraction of Na2SO4, we need to divide the number of moles of Na2SO4 by the total number of moles of Na2SO4 and water.

number of moles of Na2SO4 = 5.34 moles

number of moles of water = 53.1 kg * 1000 g/kg / 18.015 g/mol = 2.96 moles

total number of moles = number of moles of Na2SO4 + number of moles of water = 5.34 moles + 2.96 moles = 8.30 moles

Finally, calculate the mole fraction:

mole fraction of Na2SO4 = number of moles of Na2SO4 / total number of moles = 5.34 moles / 8.30 moles = 0.644

The molarity of Na2SO4 in the solution is 0.101 M, the molality is 0.1 mol/kg, and the mole fraction of Na2SO4 is 0.644.

The net ionic equation for this gas evolution reaction is H+(aq) + SO32-(aq) SO2(g) + H2O, while the balanced molecular equation is 2HBr(aq) + K2SO3(aq) SO2(g) + 2H2O(l) + 2KBr(aq) (l).

The reaction's chemical formula is K2CO3(aq)+2HBr(aq)2KBr(aq)+CO2(g)+H2O. (l) Strong electrolytes in the process, K2CO3, HBr, and KBr totally dissociate in water to generate their corresponding ions.

A salt (the KBr) and water will be created when the HBr and KOH interact. While balancing this equation, make careful to count both hydrogen atoms on the reactants side.

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