Question 1

The equation 1/2 N2 + 3/2 H2→ NH3 is not appropriately written because

Accepted Answer

A)  the number of atoms of each element on each side is not the same. 
B)  fractional coefficients are not generally used. 
C)  nitrogen is not diatomic. 
D)  the product is N2H4, not NH3. 
A)  the number of atoms of each element on each side is not the same. 
B)  fractional coefficients are not generally used. 
C)  nitrogen is not diatomic. 
D)  the product is N2H4, not NH3.

Question 2

Each of the following general equations illustrates what basic type of chemical reaction?
a. AB + CD → AD + CB ______________
b. A + B → AB ______________
c. A + BC → AC + B ______________
d. AB → A + B ______________

Accepted Answer

a.double-replacement

Question 3

In general,slow reactions

Accepted Answer

A)  are exothermic. 
B)  are endothermic. 
C)  have low activation energies. 
D)  have high activation energies. 
A)  are exothermic. 
B)  are endothermic. 
C)  have low activation energies. 
D)  have high activation energies.

Question 4

By definition,the loss of electrons by an atom or ion is called

Accepted Answer

A)  neutralization. 
B)  reduction. 
C)  oxidation. 
D)  displacement. 
A)  neutralization. 
B)  reduction. 
C)  oxidation. 
D)  displacement.

Question 5

Water solutions of which of the following are basic?

Accepted Answer

A)  Soft drinks 
B)  Baking soda 
C)  Lemonade 
D)  Vinegar 
A)  Soft drinks 
B)  Baking soda 
C)  Lemonade 
D)  Vinegar

Question 6

The rate of a chemical reaction would be decreased by

Accepted Answer

A)  stirring the reactants. 
B)  increasing the concentration of the reactants. 
C)  adding a catalyst to the reactants. 
D)  cooling the reactants. 
A)  stirring the reactants. 
B)  increasing the concentration of the reactants. 
C)  adding a catalyst to the reactants. 
D)  cooling the reactants.

Question 7

A solution of pH 5 is ______________ times as acidic as a solution of pH 6.

Accepted Answer

The answer of A solution of pH 5 is ______________...

Question 8

When the equation Al + O2→ Al2O3 is balanced,the coefficient of Al2O3 is

Accepted Answer

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

Question 9

Increased reactant concentration usually leads to an increase in reaction rate,because collisions are

Accepted Answer

A)  more violent only. 
B)  more frequent only. 
C)  both more violent and more frequent. 
D)  none of these 
A)  more violent only. 
B)  more frequent only. 
C)  both more violent and more frequent. 
D)  none of these

Question 10

All but the most inactive metals react with acids to give

Accepted Answer

A)  hydrogen and the metal salt. 
B)  hydrogen and the metal hydroxide. 
C)  hydrogen and the metal oxide. 
D)  oxygen and the metal hydride. 
A)  hydrogen and the metal salt. 
B)  hydrogen and the metal hydroxide. 
C)  hydrogen and the metal oxide. 
D)  oxygen and the metal hydride.

Question 11

Which of the following is a strong acid?

Accepted Answer

A)  Citric acid 
B)  Nitric acid 
C)  Phosphoric acid 
D)  Acetic acid 
A)  Citric acid 
B)  Nitric acid 
C)  Phosphoric acid 
D)  Acetic acid

Question 12

The number of moles of solute per liter of solution is called the ______________ of the solution.

Accepted Answer

The answer of The number of moles of solute per...

Question 13

A weak acid is one that does not

Accepted Answer

A)  taste very sour. 
B)  ionize appreciably in water. 
C)  form hydrogen gas when a metal is dropped in. 
D)  neutralize OH- ions. 
A)  taste very sour. 
B)  ionize appreciably in water. 
C)  form hydrogen gas when a metal is dropped in. 
D)  neutralize OH- ions.

Question 14

How many atoms of oxygen are contained in 44 g of carbon dioxide,CO2?

Accepted Answer

A)  3.01 × 1023 
B)  12.0 × 1023 
C)  6.02 × 1023 
D)  None of these 
A)  3.01 × 1023 
B)  12.0 × 1023 
C)  6.02 × 1023 
D)  None of these

Question 15

The H3O+ ion is called the ______________ ion.

Accepted Answer

Question 16

When the equation H2O + NO2 → NO + HNO3 is balanced,the sum of all the coefficients (both written and "understood")is ______________.

Accepted Answer

7 (coeffic

Question 17

The definitions of an acid and a base as substances that give H+ and OH- ions,respectively,in water were proposed by the chemist named ______________.

Accepted Answer

Question 18

Which of the following is a weak acid?

Accepted Answer

A)  Hydrochloric acid 
B)  Nitric acid 
C)  Sulfuric acid 
D)  Acetic acid 
A)  Hydrochloric acid 
B)  Nitric acid 
C)  Sulfuric acid 
D)  Acetic acid

Question 19

For an exothermic reaction,the energy barrier is ______________ on the reactant side than on the product side.

Accepted Answer

A)  smaller 
B)  not different in size 
C)  greater 
A)  smaller 
B)  not different in size 
C)  greater

Question 20

The substances that are formed by a chemical reaction are called the

Accepted Answer

A)  products. 
B)  reactants. 
C)  chemicals. 
D)  precipitates. 
A)  products. 
B)  reactants. 
C)  chemicals. 
D)  precipitates.

Exam 13: Chemical Reactions

The equation 1/2 N2 + 3/2 H2→ NH3 is not appropriately written because

Each of the following general equations illustrates what basic type of chemical reaction? a. AB + CD → AD + CB ______________ b. A + B → AB ______________ c. A + BC → AC + B ______________ d. AB → A + B ______________

In general,slow reactions

By definition,the loss of electrons by an atom or ion is called

Water solutions of which of the following are basic?

The rate of a chemical reaction would be decreased by

A solution of pH 5 is ______________ times as acidic as a solution of pH 6.

When the equation Al + O2→ Al2O3 is balanced,the coefficient of Al2O3 is

Increased reactant concentration usually leads to an increase in reaction rate,because collisions are

All but the most inactive metals react with acids to give

Which of the following is a strong acid?

The number of moles of solute per liter of solution is called the ______________ of the solution.

A weak acid is one that does not

How many atoms of oxygen are contained in 44 g of carbon dioxide,CO2?

The H3O+ ion is called the ______________ ion.

When the equation H2O + NO2 → NO + HNO3 is balanced,the sum of all the coefficients (both written and "understood")is ______________.

The definitions of an acid and a base as substances that give H+ and OH- ions,respectively,in water were proposed by the chemist named ______________.

Which of the following is a weak acid?

For an exothermic reaction,the energy barrier is ______________ on the reactant side than on the product side.

The substances that are formed by a chemical reaction are called the

Measurement

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Force and Motion

Work and Energy

Temperature and Heat

Waves and Sound

Optics and Wave Effects

Electricity and Magnetism

Atomic Physics

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The Chemical Elements

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Place and Time

The Solar System

Moons and Small Solar System Bodies

The Universe

The Atmosphere

Atmospheric Effects

Structural G Eology and P Late Tectonics

Minerals, rocks, and Volcanoes

Surface Processes

Geologic Time

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The equation 1/2 N₂ + 3/2 H₂→ NH₃ is not appropriately written because

Each of the following general equations illustrates what basic type of chemical reaction? a. AB + CD → AD + CB b. A + B → AB c. A + BC → AC + B d. AB → A + B

When the equation Al + O₂→ Al₂O₃ is balanced,the coefficient of Al₂O₃ is

How many atoms of oxygen are contained in 44 g of carbon dioxide,CO₂?

The H₃O⁺ ion is called the ______________ ion.

When the equation H₂O + NO₂ → NO + HNO₃ is balanced,the sum of all the coefficients (both written and "understood")is ______________.

The definitions of an acid and a base as substances that give H⁺ and OH^- ions,respectively,in water were proposed by the chemist named ______________.