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Chemistry Test Review Gr. 7

Total questions: 50

Worksheet time: 2hrs 45mins

Name
Class
Date
1.
Anything that takes up space and has mass is known as _______________.
a)
Matter
b)
Molecules
c)
Compounds
d)
Stuff
2.
What are the building blocks of MATTER?
a)
Atoms
b)
Cells
c)
Protons
d)
Neutrons
3.
What are the positively charged particles in an atom?
a)
Protons
b)
Neutrons
c)
Electrons
4.
Electrons have what charge?
a)
Negative
b)
Positive
c)
Neutral
 (No Charge)
5.

The image shows the periodic table box for POTASSIUM. What is Potassium's atomic number?

a)

19

b)

39

c)

20

d)

Impossible to tell

6.
A(n) ____________________ is a pure substance made of a single type of atom and cannot be broken down.
a)
Element
b)
Compound
c)
Molecule
d)
Mixture
7.
A molecule is formed when two or more ____________ chemically join together.
a)
Atoms
b)
Compounds
c)
Mixtures
d)
Solutions
8.

A substance made up of atoms of two or more different elements joined by chemical bonds

a)

Compound

b)

Heterogeneous Mixture

c)

Homogeneous Mixture

d)

Solution

9.

Which of the chemical equations in the image best supports the Law of Conservation of Matter?

a)

A

b)

B

c)

C

d)

D

10.

How many atoms of sodium (Na) are in one molecule of baking soda?

a)

1

b)

2

c)

3

d)

4

11.

Molecules bonded together make up atoms.

a)

true

b)

false

12.

If there is a rise in temperature during a chemical reaction it is called a _________________ reaction.

a)

endothermic

b)

exothermic

13.
Gold is an example of a(n) 
a)
pure element
b)
pure compound
c)
pure mixture
14.
A _________ is a substance made of two or more DIFFERENT elements chemically combined. 
a)
mixture
b)
compound
c)
substance 
15.
A mixture can be separated by ________ means. 
a)
physical
b)
chemical
16.
What type of property can only be observed by changing the substance into a new substance. Ex: Flammability, oxidation
a)
chemical
b)
physical
17.
Phase changes (going from a solid to a liquid to a gas) are what types of changes?
a)
chemical
b)
physical
18.
The Law of Conservation of Matter says
a)
Matter can be created, but not destroyed
b)
matter can be destroyed, but not created
c)
matter cannot be created or destroyed
19.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

20.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

21.

How many different elements are in C6H12O6?

a)
1
b)
2
c)
3
d)
4
22.

The center of an atom is called

a/an __________.

a)

atomic mass

b)

nucleus

c)

proton center

d)

energy shell

23.
Paper burning is a __________________ change. 
a)
physical
b)
chemical
24.
Dissolving Kool-Aid into water is an example of a 
a)
physical change              
b)
chemical change
25.
Which of the following would be evidence that a chemical change has occurred?
a)
change in size
b)
change in state
c)
new substance formed
d)
change in shape
26.
Is this equation balanced?
a)
Yes
b)
No
c)
Not enough information
27.
This appears on the left side of a chemical formula, and represents how many compounds there are.  What is the name of this number?
a)
A Dangling Participle 
b)
The Subscript
c)
A Prime Number
d)
The Coefficient
28.
How many hydrogen atoms are in this chemical formula: 
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
29.

What is made up two or more elements that are chemically combined?

a)

Atom

b)

Element

c)

Compound

d)

Mixture

30.

Which of the following is an example of a chemical property?

a)

The basketball is orange.

b)

The gasoline is flammable.

c)

The bike is made of metal.

d)

The slice of cheese is a solid.

31.

The vertical columns on the Periodic Table are referred to as which of the following?

a)

Groups or Families

b)

Periods or Rows

c)

Columns or Rows

d)

Valence or Orbitals

32.

Two or more substances that are combined (mixed) physically, but not chemically are called...

a)

mixture

b)

compound

c)

element

d)

atom

33.

What is NOT included in each square of the periodic table?

a)

atomic number

b)

atomic mass

c)

chemical symbol

d)

melting point

34.

When we combined vinegar and baking soda and created carbon dioxide what was the product?

a)

vinegar

b)

carbon dioxide and baking soda

c)

carbon dioxide

d)

vinegar and baking soda

35.

If there is a rise in temperature during a chemical reaction it is called a _________________ reaction.

a)

endothermic

b)

exothermic

36.

A type of reaction that absorbs energy in the form of heat or light.

a)

Chemical reaction

b)

Exothermic reaction

c)

Endothermic reaction

d)

Precipitate

37.

The rule that states that matter cannot be created or destroyed during chemical reactions.

a)

Precipitate

b)

Law of Conservation of Mass

c)

Products

d)

Reactants

38.

Sodium and chlorine react to form sodium chloride. Sodium and chlorine are examples of

a)

Reactants

b)

Products

c)

Exothermic reactions

d)

Precipitates

39.

A __________ involves a change in state, like melting, freezing, or boiling.

a)

Chemical reaction

b)

Physical change

c)

Exothermic reaction

d)

Endothermic reaction

40.

To activate a glow stick, a glass tube containing one solution is cracked inside of a plastic tube containing a different solution. The mixture of these two solutions causes the tube to give off light. This is an example of

a)

an exothermic reaction

b)

an endothermic reaction

c)

a physical change

d)

a reactant

41.

Which of the following is an example of a chemical property?

a)

The basketball is orange.

b)

The gasoline is flammable.

c)

The bike is made of metal.

d)

The slice of cheese is a solid.

42.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
43.

Is this equation balanced? Are the numbers of atoms of each element on each side of the equation the same?
2HgO → 2Hg + O2

a)
Yes
b)
No
44.
For liquid water to be made into ice, energy must be:  
a)
added 
b)
removed
45.
Rust forming on metal is an example of what type of change?
a)
chemical
b)
physical
46.
Which of the following are signs that a chemical change has taken place?
a)
bubbling
b)
color change
c)
precipitate forms
d)
all of the above
47.
Crushing tablets is what type of change?
a)
physical 
b)
chemical
48.
A substance composed of two or more elements that are chemically bonded in a definite, fixed ratio by mass is called:
a)
compound
b)
mixture
c)
ion
d)
atom
49.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
50.

When a catalyst is added to a chemical reaction the rate of reaction,,,

a)

Increases

b)

Decreases

c)

Does not change

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