Question 1

Changes that do not alter the chemical composition of a substance are called ______________ changes.

Accepted Answer

The answer of Changes that do not alter the chemical...

Question 2

The process of melting lead is an example of

Accepted Answer

A)   a physical change.
B)   a chemical change.
C)   a physical property.
D)   a chemical property.E) None of the above
F) A) and B)

Question 3

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, carbon dioxide, and ______________.

Accepted Answer

The answer of When an acid reacts with a carbonate...

Question 4

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt.

Accepted Answer

The answer of When an acid reacts with a carbonate...

Question 5

An acid added to a base will produce a

Accepted Answer

A)   salt and hydrogen ions.
B)   salt and hydroxide ions.
C)   salt and water.
D)   stronger acid and base.E) B) and D)
F) B) and C)

Question 6

One reactant of photosynthesis is

Accepted Answer

A)   hydrogen.
B)   oxygen.
C)   carbon dioxide.
D)   methane.E) A) and B)
F) None of the above

Question 7

In the reaction between HCl and Na2CO3, which gas is formed?

Accepted Answer

A)   H2
B)   CH4
C)   CO2
D)   O2E) B) and C)
F) None of the above

Question 8

The compound Mg(OH) 2 is commonly known as

Accepted Answer

A)   Epsom salt.
B)   Alka-Seltzer.
C)   smelling salts.
D)   milk of magnesia.E) A) and B)
F) A) and C)

Question 9

A reaction in which a substance reacts with oxygen, bursts into flame, and forms an oxide is called a(n) ______________ reaction.

Accepted Answer

The answer of A reaction in which a substance reacts...

Question 10

When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction

Accepted Answer

A)   is an acid-base reaction.
B)   is endothermic.
C)   never reaches equilibrium.
D)   is exothermic.E) B) and D)
F) None of the above

Question 11

When the forward and reverse reactions are proceeding at the same rate, the reaction is said to have reached ______________.

Accepted Answer

The answer of When the forward and reverse reactions are...

Question 12

The original substances in a chemical reaction are called the ______________.

Accepted Answer

The answer of The original substances in a chemical reaction...

Question 13

Which of the following compounds would not precipitate from an aqueous solution during a double-replacement reaction?

Accepted Answer

A)   Cu(NO3) 2
B)   CuCO3
C)   AgCl
D)   AlPO4E) All of the above
F) B) and C)

Question 14

In general, slow reactions

Accepted Answer

A)   are exothermic.
B)   are endothermic.
C)   have low activation energies.
D)   have high activation energies.E) A) and C)
F) None of the above

Question 15

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

Accepted Answer

A)   neutralization.
B)   reduction.
C)   oxidation.
D)   displacement.E) B) and D)
F) A) and D)

Question 16

Most ______________ do their jobs by decreasing the activation energy for a reaction.

Accepted Answer

The answer of Most ______________ do their jobs by decreasing...

Question 17

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

Accepted Answer

A)   products.
B)   reactants.
C)   chemicals.
D)   precipitates.E) A) and B)
F) A) and C)

Question 18

The equation 4H2O2 → 4H2O + 2O2 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.E) B) and D)
F) A) and B)

Question 19

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 theseE) B) and C)
F) A) and C)

Question 20

When an acid reacts with a base, the products are ______________ and a salt.

Accepted Answer

The answer of When an acid reacts with a base,...

Exam 13: Chemical Reactions

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, carbon dioxide, and ______________.

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One reactant of photosynthesis is

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When an acid reacts with a base, the products are ______________ and a salt.

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

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The equation 4H2O2 → 4H2O + 2O2 is not appropriately written because

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When carbon combines with oxygen, energy is released to the surroundings. Thus this reaction

Correct AnswerverifiedShow Answer

When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt.

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Most ______________ do their jobs by decreasing the activation energy for a reaction.

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The original substances in a chemical reaction are called the ______________.

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When the forward and reverse reactions are proceeding at the same rate, the reaction is said to have reached ______________.

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The process of melting lead is an example of

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

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In general, slow reactions

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Which of the following compounds would not precipitate from an aqueous solution during a double-replacement reaction?

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The compound Mg(OH) 2 is commonly known as

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In the reaction between HCl and Na2CO3, which gas is formed?

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Changes that do not alter the chemical composition of a substance are called ______________ changes.

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A reaction in which a substance reacts with oxygen, bursts into flame, and forms an oxide is called a(n) ______________ reaction.

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

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An acid added to a base will produce a

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The equation 4H₂O₂ → 4H₂O + 2O₂ is not appropriately written because

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The compound Mg(OH) ₂ is commonly known as

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In the reaction between HCl and Na₂CO₃, which gas is formed?

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