Quiz about Chemical Reactions Review

Question 1

Everything to the left of the arrow in the picture are called products.

Accepted Answer

False

Answer

True

Question 2

The Law of Conservation of Mass states

Accepted Answer

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Answer

that matter exists in all states and reacts the same

Answer

that matter can only be changed into new substances by introducing a catalyst

Answer

that matter exists in the same state throughout any chemical change

Question 3

How many Al atoms are in this compound? 4Al₂O₃

Accepted Answer

8

Answer

2

Answer

6

Answer

4

Question 4

Why does this picture demonstrate the Law of Conservation of Mass?

Accepted Answer

the number of atoms of each element are the same on both sides

Answer

they start out separate and end up combined

Answer

the same elements are used

Answer

it doesn't demonstrate the Law of Conservation of Mass

Question 5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

Accepted Answer

the mass is the same

Answer

the product is doubled

Answer

the product is half the mass of the reactants

Answer

the mass changes depending on the reaction

Question 6

10g of white powder reacts with 10g of clear liquid. The reaction bubbles and changes color producing a black liquid that has a mass of 13g. What can be concluded?

Accepted Answer

7g of gas was produced

Answer

5g of gas was produced

Answer

This experiment violates the conservation of mass

Answer

The excess reactant is destroyed & disappears during the reaction

Question 7

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

Accepted Answer

13g

Answer

47g

Answer

23g

Answer

You cant tell with the given information

Question 8

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 9

What are the reactants in the chemical equation pictured?

Accepted Answer

CH₄ and O₂

Answer

CH₄ and CO₂

Answer

CO₂ and H₂O

Answer

O₂ and H₂O

Question 10

What are the products of the chemical reaction pictured?

Accepted Answer

CO₂ and H₂O

Answer

CH₄ and CO₂

Answer

CH₄ and O₂

Answer

O₂ and H₂O

Question 11

What is the large number written before a chemical formula called?

Accepted Answer

Coefficient

Answer

Subscript

Answer

Reactant

Answer

Product

Question 12

What is the small number written after a chemical symbol called?

Accepted Answer

Subscript

Answer

Coefficient

Answer

Product

Answer

Reactant

Question 13

A molecule is smaller than an atom.

Accepted Answer

False

Answer

True

Question 14

Chemical Reaction

Accepted Answer

the process in which substances undergo chemical changes that result in the formation of new substances

Answer

a substance formed as a result of a chemical reaction

Answer

a change in matter that produces one or more new substances

Answer

a substance that enters into a chemical reaction

Question 15

Chemical Equation

Accepted Answer

A representation of a chemical reaction

Answer

the starting materials in a chemical reaction

Answer

the new substances that are formed in a chemical reaction

Answer

tells how many atoms, molecules, or formula units take part in a reaction

Question 16

The chemical formula of glucose is C₆H₁₂O_6.Is glucose an element, compound, or mixture?

Accepted Answer

compound

Answer

element

Answer

mixture

Question 17

How many oxygen atoms are in this chemical formula?

Accepted Answer

4 oxygen atoms

Answer

7 oxygen atoms

Answer

3 oxygen atoms

Answer

1 oxygen atoms

Question 18

How many oxygen atoms are in this chemical formula?

Accepted Answer

6 oxygen atoms

Answer

2 oxygen atoms

Answer

3 oxygen atoms

Answer

4 oxygen atoms

Question 19

A chemical property can only be observed when a substance changes into a completely different substance.

Accepted Answer

True

Answer

False

Question 20

A physical property is...

Accepted Answer

a property that is observed and the substance does not change into something new

Answer

a property that is observed and the substance changes into something new

Question 21

Chemical changes can be reversed.

Accepted Answer

False

Answer

True

Question 22

Which of the following is NOT an example of a chemical change?

Accepted Answer

Melting a metal can

Answer

Burning a piece of paper

Answer

Baking a cake

Answer

Digesting food

Question 23

Provides evidence that a chemical reaction has occurred.

Accepted Answer

formation of a gas

Answer

dissolving

Answer

melting

Answer

bending

Question 24

a copper penny turning greenish after a few years.

Accepted Answer

Chemical Change

Answer

Physical Change

Question 25

Mass is the measure of _______ in a substance

Accepted Answer

Matter

Answer

Purity

Answer

Oxygen

Answer

Properties

Question 26

Cutting paper is a _____ change.

Accepted Answer

Physical

Answer

None of these

Answer

Chemical

Question 27

Bubbling and fizzing is a sign of what kind of reaction?

Accepted Answer

Chemical

Answer

Physical

Question 28

What is an example of an element?

Accepted Answer

K (Potassium)

Answer

The human body

Answer

Fools Gold

Answer

Water

Question 29

Which of the following is NOT an example of a physical change

Accepted Answer

Burning wood

Answer

Cutting paper

Answer

Melting glass

Answer

Boiling water

Question 30

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The properties will likely be different because the repeating groups of atoms that make up each sample are different.

Answer

The properties will likely be different because there are more repeating groups of atoms in Sample 2.

Answer

The properties will likely be the same because the repeating groups of atoms that make up the two samples have one of the same types of atoms.

Answer

The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

Question 31

Andres is a chemist working at a company that makes ink. To make a new kind of ink, Andres mixed two liquid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Andres found two solid 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

A

Answer

A.

Answer

B

Answer

C

Answer

D

Question 32

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are solids at room temperature. Will the other properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

Accepted Answer

The other properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

Answer

The other properties will likely be different because there are more repeating groups of atoms in Sample 2.

Answer

The other properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms.

Answer

The other properties will likely be the same because both samples are solids at room temperature.

Question 33

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

Accepted Answer

True

Answer

False

Question 34

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 35

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 36

How many total atoms are in this compound? Al₂O₃

Accepted Answer

5

Answer

2

Answer

6

Answer

3

Chemical Reactions Review

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