Quiz about Chemical Reactions

Question 1

the starting materials in a chemical reaction

Accepted Answer

Reactants

Answer

Products

Answer

Starters

Answer

Enders

Question 2

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

Accepted Answer

Product

Answer

Reactant

Answer

Starters

Answer

Enders

Question 3

an atom or molecule which has gained or lost one or more of its valence electrons

Accepted Answer

Ion

Answer

Covalent Bond

Answer

Chemical Formula

Answer

Compound

Question 4

a substance formed when two or more elements are chemically bonded together

Accepted Answer

Compound

Answer

Element Soup

Answer

Pure Element

Answer

Ion

Question 5

tells us the number of atoms of each element in a compound

Accepted Answer

Chemical Formula

Answer

Coeffecient

Answer

Exponent

Answer

Calculator

Question 6

a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat

Accepted Answer

Endothermic Reaction

Answer

Exothermic Reaction

Answer

Diffusion

Answer

Fission

Question 7

a chemical reaction that releases energy by light or heat

Accepted Answer

Exothermic Reaction

Answer

Endothermic Reaction

Answer

Diffusion

Answer

Fission

Question 8

type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound

Accepted Answer

Single Displacement

Answer

Double Displacement

Answer

Synthesis

Answer

Decomposition

Question 9

type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products

Accepted Answer

Double Displacement

Answer

Single Displacement

Answer

Synthesis

Answer

Decomposition

Question 10

type of reaction in which two or more elements combine to form a more complex compound

Accepted Answer

Synthesis

Answer

Double Displacement

Answer

Single Displacement

Answer

Decomposition

Question 11

type of reaction in which a compound is broken down into its simple elements

Accepted Answer

Decomposition

Answer

Double Displacement

Answer

Single Displacement

Answer

Synthesis

Question 12

A chemical change is different than a physical change because in a chemical change

Accepted Answer

a new substance is formed and in a physical no new substance is formed

Answer

chemicals are used

Answer

molecules do not physically touch

Answer

the change can be seen but in a physical change it cannot

Question 13

Which of the following 2 are chemical reactions?

Accepted Answer

burning wood

Accepted Answer

mixing baking soda and vinegar

Answer

sugar dissolving in water

Answer

water turning into steam

Answer

tearing paper

Question 14

How many Carbons are present on the reactant side?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 15

How many Hydrogens are on the product side of this chemical equation?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 16

How many Oxygens are on the product side of this chemical equation?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 17

Why are chemical equations always balanced? Select ALL that apply.

Accepted Answer

Matter cannot be created.

Accepted Answer

Matter cannot be destroyed.

Accepted Answer

Matter can only be rearranged/conserved.

Answer

Matter doesn't matter.

Question 18

In a chemical reaction, if the reactants are heated, the reaction usually happens

Accepted Answer

faster

Answer

slower

Answer

at the same rate

Answer

in a smaller volume

Question 19

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

Accepted Answer

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Answer

Yes, the amount of atoms for each element are equal on both the reactant and product side.

Answer

No, the carbons are not the same number on both the reactant and product side.

Answer

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

Question 20

Which of the following is a common sign that a chemical change has occurred?

Accepted Answer

A chemical has turned a different color, bubbled, and/or changed temperature.

Answer

A chemical has changed to a different state of matter, such as a liquid to a solid.

Answer

A chemical has changed size.

Answer

A chemical has become a different shape.

Question 21

The left side of the equation below is called

Accepted Answer

Reactants

Answer

Products

Question 22

The right side of the equation below is called the

Accepted Answer

products

Answer

reactants

Question 23

A chemical reaction that absorbs heat

Accepted Answer

Endothermic

Answer

Single replacement

Answer

Exothermic

Answer

Decomposition

Question 24

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

Cutting into fourths

Answer

Color changes

Answer

Light is produced

Answer

Gas is formed

Question 25

Which of the following is a chemical reaction?

Accepted Answer

Sodium and chlorine atoms bond to form salt molecules.

Answer

Ice melts to form water.

Answer

Carbon dioxide freezes to form dry ice.

Answer

Salt and water mix to form salt water

Question 26

2H₂ + O₂-> 2H₂O

In the equation shown, what are the reactants?

Accepted Answer

Hydrogen and oxygen molecules

Answer

Hydrogen atoms

Answer

Water molecules

Answer

Ice crystals

Question 27

Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?

Accepted Answer

H2SO4

Answer

2H4SO

Answer

H4S2O

Answer

H₂S₂O₄

Question 28

What is the best synonym for the word "stoichiometry?"

Accepted Answer

balancing chemical equations

Answer

combining atoms

Answer

discovering new chemicals

Answer

breaking the chemical bonds that hold molecules together

Question 29

The chemical symbol "Ni" most likely represents:

Accepted Answer

Nickel

Answer

Carbon

Answer

Antimony

Answer

Lead

Question 30

What's the easiest way to balance a chemical equation?

Accepted Answer

Trial and error

Answer

Using the periodic table

Answer

Complex algebra

Answer

Calculus

Question 31

The ______________ states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.

Accepted Answer

law of conservation of mass

Answer

law of distribution

Answer

chemical equation law

Answer

reactant

Question 32

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

Accepted Answer

Product

Answer

Reactant

Answer

Starters

Answer

Enders

Question 33

an atom or molecule which has gained or lost one or more of its valence electrons

Accepted Answer

Ion

Answer

Covalent Bond

Answer

Chemical Formula

Answer

Compound

Question 34

a substance formed when two or more elements are chemically bonded together

Accepted Answer

Compound

Answer

Element Soup

Answer

Pure Element

Answer

Ion

Question 35

a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat

Accepted Answer

Endothermic Reaction

Answer

Exothermic Reaction

Answer

Diffusion

Answer

Fission

Question 36

a chemical reaction that releases energy by light or heat

Accepted Answer

Exothermic Reaction

Answer

Endothermic Reaction

Answer

Diffusion

Answer

Fission

Question 37

type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound

Accepted Answer

Single Displacement

Answer

Double Displacement

Answer

Synthesis

Answer

Decomposition

Question 38

type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products

Accepted Answer

Double Displacement

Answer

Single Displacement

Answer

Synthesis

Answer

Decomposition

Question 39

type of reaction in which two or more elements combine to form a more complex compound

Accepted Answer

Synthesis

Answer

Double Displacement

Answer

Single Displacement

Answer

Decomposition

Question 40

type of reaction in which a compound is broken down into its simple elements

Accepted Answer

Decomposition

Answer

Double Displacement

Answer

Single Displacement

Answer

Synthesis

Question 41

A chemical change is different than a physical change because in a chemical change

Accepted Answer

a new substance is formed and in a physical no new substance is formed

Answer

chemicals are used

Answer

molecules do not physically touch

Answer

the change can be seen but in a physical change it cannot

Question 42

Which of the following 2 are chemical reactions?

Accepted Answer

burning wood

Accepted Answer

mixing baking soda and vinegar

Answer

sugar dissolving in water

Answer

water turning into steam

Answer

tearing paper

Question 43

How many Carbons are present on the reactant side?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 44

How many Hydrogens are on the product side of this chemical equation?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 45

How many Oxygens are on the product side of this chemical equation?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 46

Why are chemical equations always balanced? Select ALL that apply.

Accepted Answer

Matter cannot be created.

Accepted Answer

Matter cannot be destroyed.

Accepted Answer

Matter can only be rearranged/conserved.

Answer

Matter doesn't matter.

Question 47

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

Accepted Answer

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Answer

Yes, the amount of atoms for each element are equal on both the reactant and product side.

Answer

No, the carbons are not the same number on both the reactant and product side.

Answer

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

Question 48

Which of the following is a common sign that a chemical change has occurred?

Accepted Answer

A chemical has turned a different color, bubbled, and/or changed temperature.

Answer

A chemical has changed to a different state of matter, such as a liquid to a solid.

Answer

A chemical has changed size.

Answer

A chemical has become a different shape.

Question 49

The left side of the equation below is called

Accepted Answer

Reactants

Answer

Products

Question 50

The right side of the equation below is called the

Accepted Answer

products

Answer

reactants

Question 51

A chemical reaction that absorbs heat

Accepted Answer

Endothermic

Answer

Single replacement

Answer

Exothermic

Answer

Decomposition

Question 52

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

Cutting into fourths

Answer

Color changes

Answer

Light is produced

Answer

Gas is formed

Question 53

Which of the following is a chemical reaction?

Accepted Answer

Sodium and chlorine atoms bond to form salt molecules.

Answer

Ice melts to form water.

Answer

Carbon dioxide freezes to form dry ice.

Answer

Salt and water mix to form salt water

Question 54

2H₂ + O₂-> 2H₂O

In the equation shown, what are the reactants?

Accepted Answer

Hydrogen and oxygen molecules

Answer

Hydrogen atoms

Answer

Water molecules

Answer

Ice crystals

Question 55

Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?

Accepted Answer

H2SO4

Answer

2H4SO

Answer

H4S2O

Answer

H₂S₂O₄

Question 56

What is the best synonym for the word "stoichiometry?"

Accepted Answer

balancing chemical equations

Answer

combining atoms

Answer

discovering new chemicals

Answer

breaking the chemical bonds that hold molecules together

Question 57

The chemical symbol "Ni" most likely represents:

Accepted Answer

Nickel

Answer

Carbon

Answer

Antimony

Answer

Lead

Question 58

What's the easiest way to balance a chemical equation?

Accepted Answer

Trial and error

Answer

Using the periodic table

Answer

Complex algebra

Answer

Calculus

Question 59

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

Accepted Answer

Product

Answer

Reactant

Answer

Starters

Answer

Enders

Question 60

The law of conservation of mass says substances can neither be _______ nor ___________.

Accepted Answer

created; destroyed

Answer

built; torn down

Answer

blended together; separated

Answer

condensed; extracted

Question 61

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

Accepted Answer

reactants

Answer

producers

Answer

reactionaries

Answer

products

Question 62

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

Accepted Answer

product

Answer

originator

Answer

reactant

Answer

produce

Question 63

4 grams of hydrogen and 32 grams of oxygen will combine to form:

Accepted Answer

36

Answer

32

Answer

4

Answer

40

Question 64

A solid substance appears within the solution, can be cloudy or a thickening as well is an example of _________________.

Accepted Answer

precipitate formation

Answer

indicator change

Answer

gas formation

Answer

temperature change

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