Question 1

If the reaction shown below is exothermic, the energy level of the reactants is __________. H₂ + O₂ → 2N₂O

Accepted Answer

A)  lower than that of the products 
B)  higher than that of the products 
C)  the same as that of the products 
D)  possibly lower, possibly higher than that of the products 
E)  higher than the activation energy of the reaction 
A)  lower than that of the products 
B)  higher than that of the products 
C)  the same as that of the products 
D)  possibly lower, possibly higher than that of the products 
E)  higher than the activation energy of the reaction

Question 2

One mole of particles of any substance contains how many particles?

Accepted Answer

A)  106 
B)  3 × 10-10 
C)  3 × 1010 
D)  6.02 × 1023 
E)  6.02 × 10-23 
A)  106 
B)  3 × 10-10 
C)  3 × 1010 
D)  6.02 × 1023 
E)  6.02 × 10-23

Question 3

The following reaction takes place when an electric current is passed through water. It is an example of a __________ reaction. 
2 H₂O → 2H₂ + O₂

Accepted Answer

A)  combination 
B)  single replacement 
C)  dehydration 
D)  decomposition 
E)  double replacement 
A)  combination 
B)  single replacement 
C)  dehydration 
D)  decomposition 
E)  double replacement

Question 4

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

Accepted Answer

A)  doubled. 
B)  the same. 
C)  decreased by one. 
D)  increased by one. 
E)  dependent on the temperature. 
A)  doubled. 
B)  the same. 
C)  decreased by one. 
D)  increased by one. 
E)  dependent on the temperature.

Question 5

What is the coefficient of hydrogen, H₂, when the following equation is balanced?
 Al + H₂SO₄ → Al2(SO₄)3 + ? H₂

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 6

Identify the letter of the diagram corresponding to the given type of reaction. A.  B.  
-exothermic reaction

Accepted Answer

A) Diagram A 
B) Diagram B 
A) Diagram A 
B) Diagram B

Question 7

The mass of one mole of water is 18.0 g.

Accepted Answer

A) True 
 B)False

Question 8

Answer the question(s) that follow about the following reaction.
2H₂O₂ → 2H₂O + O₂
-How many moles of hydrogen peroxide ( H₂O₂) are needed to produce 5.0 moles of water?

Accepted Answer

A)  1.0 moles 
B)  2.0 moles 
C)  4.0 moles 
D)  5.0 moles 
E)  8.0 moles 
A)  1.0 moles 
B)  2.0 moles 
C)  4.0 moles 
D)  5.0 moles 
E)  8.0 moles

Question 9

Which of the following gives the balanced equation for this reaction? K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

Accepted Answer

A)  KPO₄ + CaNO₃ + KNO₃ 
B)  K₃PO₄ + Ca(NO₃)₂→ Ca₃(PO₄)₂ + 3KNO₃ 
C)  2K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6KNO₃ 
D)  2K₃PO₄ + 3Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6KNO₃ 
E)  K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃ 
A)  KPO₄ + CaNO₃ + KNO₃ 
B)  K₃PO₄ + Ca(NO₃)₂→ Ca₃(PO₄)₂ + 3KNO₃ 
C)  2K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6KNO₃ 
D)  2K₃PO₄ + 3Ca(NO₃)₂ → Ca₃(PO₄)₂ + 6KNO₃ 
E)  K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

Question 10

In an exothermic reaction, heat is a product.

Accepted Answer

A) True 
 B)False

Question 11

Loss of electrons is an oxidation.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following correctly gives the best coefficients for the reaction below? 
N₂H4 + H₂O₂ → N₂ + H₂O

Accepted Answer

A)  1, 1, 1 ,1 
B)  1, 2, 1, 4 
C)  2, 4, 2, 8 
D)  1, 4, 1, 4 
E)  2, 4, 2, 4 
A)  1, 1, 1 ,1 
B)  1, 2, 1, 4 
C)  2, 4, 2, 8 
D)  1, 4, 1, 4 
E)  2, 4, 2, 4

Question 13

The number of particles in 1 mole of hydrogen gas is __________.

Accepted Answer

The answer of The number of particles in 1 mole...

Question 14

What coefficient is placed in front of O₂ to complete the balancing of the following equation? 
C5H₈ + ? O₂ → 5CO₂ + 4H₂O

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  7 
E)  9 
A)  1 
B)  3 
C)  5 
D)  7 
E)  9

Question 15

A chemical equation is balanced when

Accepted Answer

A)  the total number of molecules is the same in reactants and products. 
B)  the total number of ions is the same in reactants and products. 
C)  the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
D)  the number of atoms of each element is the same in reactants and products. 
E)  the charge on each atom is the same in reactants and products. 
A)  the total number of molecules is the same in reactants and products. 
B)  the total number of ions is the same in reactants and products. 
C)  the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. 
D)  the number of atoms of each element is the same in reactants and products. 
E)  the charge on each atom is the same in reactants and products.

If the reaction shown below is exothermic, the energy level of the reactants is __________. H₂ + O₂ → 2N₂O

One mole of particles of any substance contains how many particles?

The following reaction takes place when an electric current is passed through water. It is an example of a __________ reaction. 2 H₂O → 2H₂ + O₂

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

What is the coefficient of hydrogen, H₂, when the following equation is balanced? Al + H₂SO₄ → Al₂(SO₄)₃+ ? H₂

Identify the letter of the diagram corresponding to the given type of reaction. A. B. -exothermic reaction

The mass of one mole of water is 18.0 g.

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many moles of hydrogen peroxide ( H₂O₂) are needed to produce 5.0 moles of water?

Which of the following gives the balanced equation for this reaction? K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

In an exothermic reaction, heat is a product.

Loss of electrons is an oxidation.

Which of the following correctly gives the best coefficients for the reaction below? N₂H4 + H₂O₂ → N₂ + H₂O

The number of particles in 1 mole of hydrogen gas is __________.

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O₂ → 5CO₂ + 4H₂O

A chemical equation is balanced when

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Exam 6: Chemical Reactions and Quantities

If the reaction shown below is exothermic, the energy level of the reactants is __________. H₂ + O₂ → 2N₂O

One mole of particles of any substance contains how many particles?

The following reaction takes place when an electric current is passed through water. It is an example of a __________ reaction. 2 H₂O → 2H₂ + O₂

In any balanced chemical equation, the number of each type of atom on both sides of the equation is

What is the coefficient of hydrogen, H₂, when the following equation is balanced? Al + H₂SO₄ → Al2(SO₄)3 + ? H₂

Identify the letter of the diagram corresponding to the given type of reaction. A. B. -exothermic reaction

The mass of one mole of water is 18.0 g.

Answer the question(s) that follow about the following reaction. 2H₂O₂ → 2H₂O + O₂ -How many moles of hydrogen peroxide ( H₂O₂) are needed to produce 5.0 moles of water?

Which of the following gives the balanced equation for this reaction? K₃PO₄ + Ca(NO₃)₂ → Ca₃(PO₄)₂ + KNO₃

In an exothermic reaction, heat is a product.

Loss of electrons is an oxidation.

Which of the following correctly gives the best coefficients for the reaction below? N₂H4 + H₂O₂ → N₂ + H₂O

The number of particles in 1 mole of hydrogen gas is __________.

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C5H₈ + ? O₂ → 5CO₂ + 4H₂O

A chemical equation is balanced when

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Amines and Amides

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What is the coefficient of hydrogen, H₂, when the following equation is balanced? Al + H₂SO₄ → Al₂(SO₄)₃+ ? H₂

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O₂ → 5CO₂ + 4H₂O