Quiz about Basic Chemical Reactions

Question 1

During a reaction, atoms are

Accepted Answer

neither created or destroyed - just rearranged

Answer

created

Answer

destroyed

Question 2

Is a copper penny turning greenish after a few years a chemical or physical change?

Accepted Answer

Chemical Change

Answer

Physical Change

Question 3

the starting materials in a chemical reaction are called what?

Accepted Answer

Reactants

Answer

Products

Answer

Starters

Answer

Enders

Question 4

a substance that is formed as the result of a chemical reaction is called

Accepted Answer

Product

Answer

Reactant

Answer

Starters

Answer

Enders

Question 5

What type of reaction involves the breaking down of a substance into simpler substances?

Accepted Answer

Decomposition Reaction

Answer

Single Displacement Reaction

Answer

Double Displacement Reaction

Answer

Synthesis Reaction

Question 6

A copper penny turning greenish after a few years is an example of ...

Accepted Answer

Chemical Change

Answer

Physical Change

Question 7

A chemical reaction is when...

Accepted Answer

Atoms and molecules break apart and regroup to form new products

Answer

Atoms and molecules are destroyed

Answer

Atoms and molecules are created

Answer

Atoms and molecules go on vacation and relax a little

Question 8

Which chemical equation matches the model shown?

Accepted Answer

3C + 2O2 --> 3CO2

Answer

3C + 4O --> 3CO2

Answer

C3 + 4O --> 3CO6

Answer

C3 + 2O2 --> 3CO6

Question 9

The substances listed on the right side of a chemical equation are the

Accepted Answer

Products

Answer

Yields

Answer

Reactants

Answer

Precipitates

Question 10

The substances listed on the left side of a chemical equation are the

Accepted Answer

Reactants

Answer

Products

Answer

Coefficients

Answer

Precipitates

Question 11

How would you describe this chemical formula?
3 H2O

Accepted Answer

3 H2O molecules

Answer

3 H2O atoms

Answer

3 H2O elements

Answer

3 H2O parts

Question 12

a starting substance that is part of a chemical reaction

Accepted Answer

reactant

Answer

Product

Answer

chemical formula

Answer

reactives

Question 13

Tiana is a chemist who is making a chemical to add to swimming pools in order to make the water safer. She mixed two solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Tiana found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 14

Damian mixed two samples together: a red liquid that smells irritating and a black solid with no smell. He analyzed the results and found two ending substances. One of the ending substances was a yellow solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Damian mixed together?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 15

Marisol mixed two samples together: a brown liquid with no smell and a colorless gas that smells irritating. She analyzed the results and found two ending substances. One of the ending substances smelled sweet. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Marisol mixed together?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 16

Patrik works at a company that makes paper and needs a chemical to make the paper brighter. He mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Patrik found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Answer

D.

Question 17

An ending substance that is made during a chemical reaction.

Accepted Answer

Product

Answer

Reactant

Answer

Chemical equations

Answer

Formulas

Question 18

A substance made when two or more different elements are chemically combined. Water is a compound made of hydrogen and oxygen.

Accepted Answer

Compound

Answer

Matter

Answer

Elements

Answer

Molecules

Question 19

What is the law that states mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Answer

Law of Definite Proportions

Answer

Law of Multiple Proportions

Answer

Law of Constant Composition

Question 20

In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@, what are the reactants?

Accepted Answer

$$ ext{H}_2$$ and $$ ext{O}_2$$

Answer

$$ ext{H}_2 ext{O}$$

Answer

$$ ext{O}_2$$ and $$ ext{H}_2 ext{O}$$

Answer

$$ ext{H}_2$$ and $$ ext{H}_2 ext{O}$$

Question 21

Which of the following is an example of an exothermic reaction?

Accepted Answer

Combustion of gasoline

Answer

Photosynthesis

Answer

Melting of ice

Answer

Evaporation of water

Question 22

What is the role of a catalyst in a chemical reaction?

Accepted Answer

It decreases the activation energy needed

Answer

It increases the temperature of the reaction

Answer

It becomes part of the final product

Answer

It changes the reactants

Question 23

Which type of reaction involves the exchange of ions between two compounds?

Accepted Answer

Double replacement reaction

Answer

Synthesis reaction

Answer

Decomposition reaction

Answer

Single replacement reaction

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