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Chemistry Module Test Review

Total questions: 40

Worksheet time: 1hrs 20mins

Name
Class
Date
1.

Thermal energy flows from ____ matter to ____ matter.

a)

warmer; cooler

b)

cooler; warmer

c)

higher; lower

d)

lower; higher

2.
What is an element? 
a)
a material that is shiny and usually hard and strong
b)
a substance made up of hydrogen and one other kind of atom
c)
a substance made of just one kind of molecule that cannot be broken down into something simpler
d)
a substance made of just one kind of atom that cannot be broken down into something simpler
3.
What does the subscript 2 show in the chemical formula H2O?
a)
There are 2 water molecules. 
b)
There are 2 oxygen atoms. 
c)
There are 2 hydrogen atoms. 
d)
There is half of a hydrogen atom. 
4.
Which of the following is true about mixtures and compounds? 
a)
A mixture contains different substances that are not chemically combined with one another.
b)
Mixtures and compounds are both made of two or more different substances.
c)
A compound forms when different substances chemically combine to form a new substance.
d)
all of these 
5.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide? 
a)
compound 
b)
atom 
c)
element 
d)
mixture 
6.
Which of the following is true about pure substances? 
a)
A pure substance can always be separated by physical means.
b)
All pure substances are unable to be separated by any means.
c)
A pure substance has the same chemical properties throughout.
d)
A pure substance can only be made up of one kind of atom.
7.
Which physical property refers to the temperature at which a substance in a solid state transforms to a liquid state? 
a)
freezing point 
b)
evaporating point 
c)
melting point 
d)
boiling point 
8.
Jordan placed three blocks in a tub of water. 
What can Jordan conclude about the three blocks? 
a)
Each block is made of the same material. 
b)
Block X weighs more than block Y. 
c)
Block Z is made of a denser material than block Y. 
d)
Block Y is made of a denser material than block X. 
9.
Marjorie is trying to determine the identity of an unknown substance.  After running some tests, she determines that the substance is insoluble in CCl4 and has a density of about 2.2 g/mL.  Using the data above, which of the following substances is most likely Marjorie's unknown? 
a)
SiO2
b)
NaCl 
c)
FeCl3
d)
C10H8
10.
The chemical formula for calcium cyanamide is CCaN2. How many Carbon atoms are there in one molecule of calcium cyanamide?
a)
0
b)
1
c)
2
d)
3
11.
Which of the following properties is a chemical property of matter?
a)

malleability (the ability to bend)

b)
flammability
c)

density

d)
color
12.
Which of the following is a physical property of matter?
a)
Melting point
b)

Malleability (the ability to bend)

c)

solubility

d)
all of the above
13.

Which chemical formula best represents the molecule pictured?

a)

NH₃

b)

N₃H₃

c)

N₃H

d)

3NH

14.

When iron reacts with oxygen, it forms iron oxide, or rust. 
Fe + O2  → Fe2O3  
If 12g of iron (Fe) combines with 2g of oxygen (O2), how much rust (Fe₂O₃) is formed? 

a)

6 grams

b)

24 grams

c)

10 grams

d)

14 grams

15.
The diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water.
The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs? 
a)
The total number of particles in the system decreases. 
b)
The total number of particles in the system increases. 
c)
The total mass of the particles in the system increases. 
d)
The total mass of the particles in the system stays the same. 
16.
Over time, an iron nail reacts with water to produce iron oxide, or rust. Which of the following is a signal that rusting has taken place? 
a)
a color change on the nail from silver to reddish-brown 
b)
the release of an odor and the presence of bubbles 
c)
the release of heat and steam at the area where the mixture occurred 
d)
the appearance of sparks 
17.

What is one molecule of CH₄O made up of?

a)

1 carbon, 1 hydrogen, and 1 oxygen

b)

2 carbon, 2 hydrogen, and 2 oxygen

c)

1 carbon, 4 hydrogen, and 1 oxygen

d)

1 carbon, 1 hydrogen, and 4 oxygen

18.

The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).
2Na + Cl2 → 2NaCl
In this equation, which of the following is a reactant?
I.  Na
II.  Cl2
III.  NaCl

a)
I, II, and III 
b)
I only 
c)
I and II only 
d)
III only 
19.
Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H2) and zinc chloride (ZnCl2).  Which of the following are products in the chemical reaction described above? 
a)
zinc and hydrogen gas 
b)
hydrogen gas and zinc chloride 
c)
hydrochloric acid and zinc chloride 
d)
zinc and hydrochloric acid 
20.
Following a physical change:
a)
The substance always changes color.
b)
The substance always has new properties.
c)

The substance is still the same maerial as it was before the change.

d)
The substance always changes density. 
21.
Your teacher tells you that in today’s science lab, you are going to make water.  If you know that water is going to be the only product, which of the following chemical equations most likely represent the chemical reaction that will occur?
a)
2H2O → 2H2 + O2
b)
H + Cl → HCl
c)
2H2 + O2 → 2H2O
d)
2N + 3H2 → 2NH3
22.

You are given an unknown substance.  Looking at the substance, you visibly distinguish different colors and different sizes of particles unevenly distributed throughout the substance.  What type of substance is this?

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

23.

You combine 2 liquids. They react and produce a solid product. What is this solid product?

a)

a precipitate

b)

a new substance

c)

evidence of a chemical change

d)

all of the above

24.

Iron reacts with oxygen to form rust.  Which chemical equation below best represents this reaction?


a)

  1. 2H₂ + O₂ ⟶ 2H₂O

b)

CO₂ + H₂O ⟶ C₆H₁₂O₆ + O₂

c)

  1. Fe + O₂ ⟶ Fe₂O₃

d)

  1. Na + Cl₂ ⟶ NaCl

25.

How does an decrease in thermal energy affect the motion of particles in a substance?

a)

the particles move faster

b)

the particles move slower

c)

the particles completely stop moving

d)

there is no effect on the particles

26.

Which of the following is a chemical change?

a)

baking a cake

b)

crushing ice

c)

carving a statue

d)

boiling water

27.

I conduct an experiment to determine how the particle size affects the separation efficiency (how long it takes to separate them) in mixtures. What is the independent variable in my experiment?

a)

the particle size

b)

the time it takes to separate the mixture

c)

the amount of the substances in the mixture

d)

the separation techniques used

28.

I conduct an experiment to determine how the particle size affects the separation efficiency (how long it takes to separate them) in mixtures. What is the dependent variable in my experiment?

a)

the particle size

b)

the time it takes to separate the mixture

c)

the amount of the substances in the mixture

d)

the separation techniques used

29.

I have 50 grams of water. I add 10 grams of sugar to the water. What is the mass of the sugarwater?

a)

60g

b)

There's no way to know, the law of conservation of mass does NOT apply to physical changes, only to chemical changes

c)

40g

d)

500g

30.

Two chemicals react and the temperature increases 10ºC. Which term would you use to describe this reaction?

a)

physical

b)

endothermic

c)

exothermic

d)

precipitate

31.

You have a reaction that absorbs energy. It feels cool to the touch. How would you describe this reaction?

a)

homogeneous

b)

endothermic

c)

exothermic

d)

heterogeneous

32.

According to the conservation of mass, what happens in a chemical reaction?

a)

matter is not created or destroyed and the same amount of mass remains

b)

a new kind of matter is created and the amount of mass either increases or decreases

c)

matter is not created or destroyed and the amount of mass may change after the reaction

d)

new matter is created and changes form so that the mass of the reactants and the products will almost be equal

33.

What are synthetic materials synthesized from?

a)

polymers

b)

synthetic materials

c)

natural resoures

d)

monomers

34.

What is the most common synthetic polymer?

a)

plastic

b)

artificial sweetner

c)

super glue

d)

tartrazine

35.

KoolAid, Bronze, and Air are all which type of mixture?

a)

heterogeneous

b)

homogeneous

36.

Mass ÷ Volume =

a)

Density

b)

Element

c)

Molecule

d)

Solubility

37.

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

a)

12 atoms of carbon (C)

b)

6 atoms of carbon (C)

c)

3 atoms of carbon (C)

d)

2 atoms of carbon (C)

38.
Element or compound?
O2
a)
Element
b)
Compound
39.

All changes in states of matter (boiling, melting, evaporation) are

a)

chemical changes

b)

physical changes

40.

Which of the following is the BEST way to know that a chemical change has taken place?

a)

a color change

b)

bubbles

c)

a new substance forms with different properties

d)

a state change

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