Quiz about Chemical Reactions Review

Question 1

When the equation Al + Br₂ --> AlBr₃ is balanced, the coefficient for Al is

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 2

A reaction that has two compounds as reactants and two compounds as products is most likely a:

Accepted Answer

double replacement reaction

Answer

synthesis reaction

Answer

single replacement reaction

Answer

decomposition reaction

Question 3

A number written in front of a chemical formula is called a(n)

Accepted Answer

coefficient

Answer

subscript

Answer

superscript

Answer

yield

Question 4

The principle that states that matter is neither created nor destroyed during a chemical reaction is called the law of:

Accepted Answer

conservation of mass

Answer

genetics

Answer

gravity

Answer

definite proportions

Question 5

The image below represents a:

Accepted Answer

decomposition reaction

Answer

synthesis reaction

Answer

single replacement reaction

Answer

double replacement reaction

Question 6

The image below represents a:

Accepted Answer

single replacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

double replacement reaction

Question 7

A _____________ change is any change that alters the form or appearance of a substance but does not change it into another substance.

Accepted Answer

physical

Answer

chemical

Question 8

A change in matter that produces one or more new substances is a ________________ change.

Accepted Answer

chemical

Answer

physical

Question 9

In a chemical reaction, the _____________ are always written on the right side of the equation

Accepted Answer

products

Answer

reactants

Answer

coefficients

Answer

subscripts

Question 10

Bread dough rises from bubbles produced when yeast reacts with sugar. What is the evidence of the chemical change?

Accepted Answer

gas production

Answer

formation of a precipitate

Answer

color change

Answer

this is actually a physical change

Question 11

In a ____________ reaction, energy is released

Accepted Answer

exothermic

Answer

endothermic

Question 12

Which of the following is NOT a physical property?

Accepted Answer

flammability

Answer

melting point

Answer

state of matter

Answer

density

Question 13

In an endothermic reaction, energy is

Accepted Answer

absorbed

Answer

released

Answer

converted to mass

Answer

synthesized

Question 14

In an exothermic reaction, energy is released. This means that products have ___________ energy than reactants.

Accepted Answer

less

Answer

more

Question 15

Water boils at 100 degrees Celsius. This is an example of a _____________ property.

Accepted Answer

physical

Answer

chemical

Question 16

Substances that enter into a chemical reaction are called:

Accepted Answer

reactants

Answer

subscripts

Answer

coefficients

Answer

products

Question 17

Another name for a chemical change is a _________________

Accepted Answer

chemical reaction

Answer

physical change

Answer

chemical bond

Answer

precipitate

Question 18

When the equation for Na + Cl₂ --> NaCl is balanced, the coefficient in front of NaCl is:

Accepted Answer

2

Answer

0

Answer

1

Answer

3

Question 19

A fish bowl is an example of a(n) ______________ system.

Accepted Answer

open

Answer

physical

Answer

chemical

Answer

closed

Question 20

In a(n) _________________ system, matter cannot enter or leave.

Accepted Answer

closed

Answer

physical

Answer

chemical

Answer

open

Question 21

__________________ is the minimum amount of energy needed to start a chemical reaction.

Accepted Answer

activation energy

Answer

catalyst energy

Answer

enzyme energy

Answer

inhibitor energy

Question 22

True or False: All chemical reactions need a certain amount of chemical energy to get started.

Accepted Answer

True

Answer

False

Question 23

Which is not true about factors that affect the rate of a chemical reaction?

Accepted Answer

decreasing the amount of enzymes increases the rate of a reaction

Answer

increasing surface area increases the rate of a reaction

Answer

decreasing the amount of inhibitors increases the rate of a reaction

Answer

increasing concentration increases the rate of a reaction

Question 24

Which type of reaction is represented in diagram A?

Accepted Answer

endothermic

Answer

exothermic

Answer

double replacement

Answer

single replacement

Question 25

In an endothermic reaction, the energy of the products is _____________________ the energy of the reactants

Accepted Answer

greater than

Answer

equal to

Answer

less than

Question 26

In a chemical equation, --> is read as:

Accepted Answer

yields

Answer

equal to

Answer

leads to

Answer

produces

Question 27

A + B --> AB is an example of a:

Accepted Answer

synthesis reaction

Answer

decomposition reaction

Answer

single replacement reaction

Answer

double replacement reaction

Question 28

Cl₂+ NaBr --> NaCl + Br₂ is an example of a:

Accepted Answer

single replacement reaction

Answer

decomposition reaction

Answer

synthesis reaction

Answer

double replacement reaction

Question 29

CaO + H₂O --> Ca(OH)₂ is an example of a:

Accepted Answer

synthesis reaction

Answer

decomposition reaction

Answer

single replacement reaction

Answer

double replacement reaction

Question 30

AgNO₃ + K₂SO₄ --> Ag₂SO₄ + KNO₃ is an example of a:

Accepted Answer

double replacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

single replacement reaction

Question 31

When the equation for MgCl₂+ Li₂CO₃ --> MgCO₃ + LiCl is balanced, the coefficient in front of Li₂CO₃ is:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 32

The chemical equation MgCl₂+ Li₂CO₃ --> MgCO₃ + LiCl is a:

Accepted Answer

double replacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

single replacement reaction

Question 33

When the chemical equation Na₃PO₄ + KOH --> NaOH + K₃PO₄ is balanced, the coefficient in front of K₃PO₄ is:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 34

___________________ is the amount of a substance in a given volume.

Accepted Answer

concentration

Answer

surface area

Answer

enzyme

Answer

inhibitor

Question 35

______________________ is a material used to decrease the rate of a chemical reaction.

Accepted Answer

Inhibitor

Answer

Catalyst

Answer

Enzyme

Answer

Surface Area

Question 36

In a balanced chemical equation,

Accepted Answer

atoms are conserved

Answer

coefficients are equal

Answer

molecules are equal

Answer

energy is not conserved

Question 37

The reaction in which hydrogen and oxygen are produced by running an electric current through water is an example of:

Accepted Answer

decomposition

Answer

single replacement

Answer

synthesis

Answer

double replacement

Question 38

In a ___________________ system, matter does not enter or leave.

Accepted Answer

closed

Answer

open

Answer

exothermic

Answer

endothermic

Question 39

A _______________ reaction occurs when two or more elements or compounds combine to form a more complex substance.

Accepted Answer

synthesis

Answer

decomposition

Answer

single replacement

Answer

double replacement

Question 40

Which of the following represents the general structure of a chemical equation?

Accepted Answer

reactants + reactants --> products + products

Answer

products + products --> reactants + reactants

Answer

reactants + products --> reactants + products

Answer

products + reactants --> products + reactants

Question 41

Curdled milk forming from the liquids of milk and lemon juice is a chemical change. You know this because:

Accepted Answer

a precipitate has formed

Answer

gas bubbles have formed

Answer

the temperature has changed

Answer

the chemical composition of the milk remains the same

Question 42

CaI₂ + Cl₂ --> CaCl₂ + I₂ is an example of a:

Accepted Answer

single replacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

double replacement reaction

Question 43

When the equation Mg + O₂ --> MgO is balanced, the coefficient in front of O₂ is

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 44

CuSO₄ + Al --> Al₂(SO₄)₃ + Cu is an example of a:

Accepted Answer

single replacement reaction

Answer

synthesis reaction

Answer

decomposition reaction

Answer

double replacement reaction

Question 45

True or False: The ability to react with oxygen is an example of a chemical property.

Accepted Answer

True

Answer

False

Question 46

The ecosphere shown the picture is an example of a(n):

Accepted Answer

closed system because it doesn't allow any mass to enter or escape

Answer

open system because it doesn't allow any mass to enter or escape

Answer

open system because it allows mass to enter and escape

Answer

closed system because it allows mass to enter and escape

Question 47

The diagram shows that matter is not created or destroyed. This demonstrates...

Accepted Answer

the law of conservation of mass

Answer

the law of segregation

Answer

the law of superposition

Answer

the law of independent assortment

Question 48

When the equation KClO₃ --> KCl + O₂ is balanced, the sum of the coefficients is:

Accepted Answer

7

Answer

3

Answer

5

Answer

9

Question 49

KClO₃ --> KCl + O₂is an example of a:

Accepted Answer

decomposition reaction

Answer

synthesis reaction

Answer

single replacement reaction

Answer

double replacement reaction

Question 50

When the equation H₂ + N₂ --> NH₃ is balanced, what is the coefficient in front of H₂?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

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