Question 1

The equation H2O2 → H2O + O is not correctly written because

Accepted Answer

A)  the number of atoms of each element on each side is not the same. 
B)  the mass indicated on each side is not the same. 
C)  oxygen is diatomic. 
D)  hydrogen peroxide decomposes to H2O and H. 
A)  the number of atoms of each element on each side is not the same. 
B)  the mass indicated on each side is not the same. 
C)  oxygen is diatomic. 
D)  hydrogen peroxide decomposes to H2O and H.

Question 2

When energy is released in a chemical reaction, the reaction is called a(n) ______________ reaction.

Accepted Answer

The answer of When energy is released in a chemical...

Question 3

Hydrogen gas would be a product of the reaction of

Accepted Answer

A)  vinegar and baking soda. 
B)  iron and hydrochloric acid. 
C)  oxygen and methane. 
D)  HCl and NaOH. 
A)  vinegar and baking soda. 
B)  iron and hydrochloric acid. 
C)  oxygen and methane. 
D)  HCl and NaOH.

Question 4

The loss of oxygen or gain of electrons by an atom or ion is called ______________.

Accepted Answer

The answer of The loss of oxygen or gain of...

Question 5

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

Accepted Answer

The answer of The molarity of a solution is the...

Question 6

Complete and balance the following equations:
a. HNO3 + Ba(OH)2 → ____________________.
b. H3PO4 + CaCO3 → _____________________.

Accepted Answer

a. 2HNO₃ + Ba(OH)

Question 7

A neutral aqueous solution has a pH of ______________.

Accepted Answer

The answer of A neutral aqueous solution has a pH...

Question 8

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 9

When a hydrocarbon or carbon-hydrogen-oxygen compound is burned completely, the products are

Accepted Answer

A)  CO2 and H2O. 
B)  CH2 and O2. 
C)  CO and H2. 
D)  C and H2. 
A)  CO2 and H2O. 
B)  CH2 and O2. 
C)  CO and H2. 
D)  C and H2.

Question 10

Balance the chemical equation: Al2S3+ H2O → Al(OH)3 + H2S

Accepted Answer

Al<sub>2</sub>S<sub>

Question 11

The equation 1H2SO4 → 1H2O + 4O2 is not appropriately written because

Accepted Answer

A)  oxygen is not diatomic. 
B)  fractional coefficients are not generally used. 
C)  the number of atoms of each element on each side is not the same. 
D)  the simplest set of coefficients has not been used. 
A)  oxygen is not diatomic. 
B)  fractional coefficients are not generally used. 
C)  the number of atoms of each element on each side is not the same. 
D)  the simplest set of coefficients has not been used.

Question 12

When the equation NH4NO3→ N2O + H2O is balanced, the coefficient of N2O is

Accepted Answer

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

Question 13

A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called

Accepted Answer

A)  an oxidizing agent. 
B)  a catalyst. 
C)  an activation agent. 
D)  a reducing agent. 
A)  an oxidizing agent. 
B)  a catalyst. 
C)  an activation agent. 
D)  a reducing agent.

Question 14

Which of the following is not a property of an aqueous solution of an acid?

Accepted Answer

A)  Reacts with many metals to liberate hydrogen gas 
B)  Changes the color of litmus dye from red to blue 
C)  Tastes sour 
D)  Conducts an electric current 
A)  Reacts with many metals to liberate hydrogen gas 
B)  Changes the color of litmus dye from red to blue 
C)  Tastes sour 
D)  Conducts an electric current

Question 15

The human body contains thousands of catalysts called ______________.

Accepted Answer

The answer of The human body contains thousands of catalysts...

Question 16

How many moles of He would 3.01 × 1023 helium atoms be?

Accepted Answer

A)  2.00 
B)  4.00 
C)  0.50 
D)  1.00 
E)  None of these 
A)  2.00 
B)  4.00 
C)  0.50 
D)  1.00 
E)  None of these

Question 17

A solution with a pH of 14 is

Accepted Answer

A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic. 
A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic.

Question 18

A chemical reaction is at equilibrium when

Accepted Answer

A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing. 
A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing.

Question 19

Avogadro's number has a numerical value of

Accepted Answer

A)  6.02 × 1023. 
B)  1.00 × 1023. 
C)  3.01 × 1023. 
D)  none of these. 
A)  6.02 × 1023. 
B)  1.00 × 1023. 
C)  3.01 × 1023. 
D)  none of these.

Question 20

Increased temperature 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

Exam 13: Chemical Reactions

The equation H2O2 → H2O + O is not correctly written because

When energy is released in a chemical reaction, the reaction is called a(n) ______________ reaction.

Hydrogen gas would be a product of the reaction of

The loss of oxygen or gain of electrons by an atom or ion is called ______________.

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

Complete and balance the following equations: a. HNO3 + Ba(OH)2 → ____________________. b. H3PO4 + CaCO3 → _____________________.

A neutral aqueous solution has a pH of ______________.

All but the most inactive metals react with acids to give

When a hydrocarbon or carbon-hydrogen-oxygen compound is burned completely, the products are

Balance the chemical equation: Al2S3+ H2O → Al(OH)3 + H2S

The equation 1H2SO4 → 1H2O + 4O2 is not appropriately written because

When the equation NH4NO3→ N2O + H2O is balanced, the coefficient of N2O is

A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called

Which of the following is not a property of an aqueous solution of an acid?

The human body contains thousands of catalysts called ______________.

How many moles of He would 3.01 × 1023 helium atoms be?

A solution with a pH of 14 is

A chemical reaction is at equilibrium when

Avogadro's number has a numerical value of

Increased temperature usually leads to an increase in reaction rate because collisions are

Measurement

Motion

Force and Motion

Work and Energy

Temperature and Heat

Waves and Sound

Optics and Wave Effects

Electricity and Magnetism

Atomic Physics

Nuclear Physics

The Chemical Elements

Chemical Bonding

Organic Chemistry

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

Filters

The equation H₂O₂ → H₂O + O is not correctly written because

Complete and balance the following equations: a. HNO₃ + Ba(OH)₂ → . b. H₃PO₄ + CaCO₃ → _.

Balance the chemical equation: Al₂S₃+ H₂O → Al(OH)₃ + H₂S

The equation 1H₂SO₄ → 1H₂O + 4O₂ is not appropriately written because

When the equation NH₄NO₃→ N₂O + H₂O is balanced, the coefficient of N₂O is

How many moles of He would 3.01 × 10²³ helium atoms be?