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Chemistry Unit Review

Total questions: 47

Worksheet time: 29mins

Name
Class
Date
1.
What is a reactant?
a)
The starting substance
b)
The ending substance
2.
What is a product?
a)
The starting substance
b)
The ending substance
3.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).
a)
Hydrogen and Oxygen
b)
water
4.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the product(s).
a)
Hydrogen and oxygen
b)
water
5.
Which of the following are NOT signs that a chemical reaction occured?
a)
the properties changed
b)
bubbles of gas formed
c)
color stays the same
d)
smells different
6.
Burning is always a chemical reaction.
a)
True
b)
false
7.
Which of the following is NOT a chemical reaction?
a)
burning a marshmallow in a campfire.
b)
a campfire
c)
acid rain turning a copper roof green.
d)
Dissolving red Koolaid in water.
8.

what is an atom

a)

smallest part of the universe

b)

smallest part of a substance

c)

smallest part of anything

d)

smallest part of water

9.

neutrons

a)

no charge, shells

b)

positive charge, nucleus

c)

neutral, no charge, nucleus

d)

negative charge, shells

10.

protons

a)

negative charge, nucleus

b)

positive charge, shells

c)

positive charge , nucleus

d)

neutral charge, nucleus

11.

electrons

a)

no charge, nucleus

b)

positive charge, nucleus

c)

negative charge, shells

d)

negative charge, nucleus

12.

atomic number

a)

number of protons/stands for an element

b)

number of neutrons

c)

number of electrons

d)

number of protons and neutrons

13.

lst shell holds

a)

2

b)

8

c)

18

d)

32

14.

2nd shell holds

a)

2

b)

8

c)

18

d)

32

15.

a charged atom

a)

neutral

b)

isotope

c)

ion

d)

nucleus

16.
What kind of change is a phase change?
a)
Physical - it's still the same substance
b)
chemical - it's made of chemicals 
17.
What is a pure substance that cannot be broken down into any other substance by physical or chemical means. Ex: Gold, Silver, Oxygen, & Nitrogen
a)
element
b)
compound
c)
mixture
d)
salad
18.
What type of property can only be observed by changing the substance into a new substance. Ex: Flammability, oxidation
a)
chemical
b)
physical
19.
What is an atom which has gained or last electrons called?
a)
isotope
b)
atom
c)
ion
d)
balanced
20.
What type of mixture contains visible parts (like a salad or a pizza or granite)
a)
homogenous
b)
heterogenous
21.
What is matter
a)
Anything which is solid
b)
Anything that takes up space and has mass
c)
when something is wrong
22.
Gold is an example of a(n) 
a)
pure element
b)
pure compound
c)
pure mixture
23.
Air is an example of a(n)
a)
element
b)
compound
c)
heterogenous mixture
d)
homogenous mixture
24.
In a mixture items can be separated __________
a)
chemically
b)
physically
25.
On the Periodic Table each element increases by one _________
a)
electron
b)
proton
c)
neutron
d)
letter
26.
A row across the Periodic Table where each element has the same number of energy shells
a)
column
b)
family
c)
period
27.
In what type of bond are electrons gained or lost?  This happens between a metal and a non-metal?
a)
ionic
b)
covalent
c)
subatomic
28.
In this type of bond electrons are shared by two non-metals
a)
ionic
b)
covalent
c)
subatomic
29.
When heat is added to matter, the molecules tend to 
a)
move faster and farther apart
b)
slow down
c)
nothing, heat has no impact on the state of matter
d)
freeze
30.

What is the Atomic number of Krypton(Kr)?

a)

35

b)

63

c)

36

d)

40

31.

Which element is in period 3 and group 14?

a)

Silicon

b)

Helium

c)

Mercury

d)

Neon

32.

How many Electrons are in Hydrogen?

a)

36

b)

1

c)

10

d)

18

33.

What is the Atomic mass of Krypton?

a)

13.58

b)

196.4

c)

702.2

d)

83.798

34.
Anything that takes up space and has mass is known as _______________.
a)
Matter
b)
Molecules
c)
Compounds
d)
Stuff
35.
What are the building blocks of MATTER?
a)
Atoms
b)
Cells
c)
Protons
d)
Neutrons
36.
The image shows the periodic grid for POTASSIUM. How many PROTONS are found in a potassium atom?
a)
19
b)
39
c)
20
d)
Impossible to tell
37.
The image shows the periodic grid for POTASSIUM. How many NEUTRONS are found in a potassium atom?
a)
19
b)
39
c)
20
d)
Impossible to tell
38.
When a chemical reaction happens
a)
bonds must be broken and reformed
b)
chemicals don't collide
c)
atoms keep their arrangements
d)
chemicals keep their same properties
39.
The little number inside a chemical formula is called the _________
a)
subscript
b)
coefficient
c)
superscript
d)
symbol
40.

The big number on the front of the chemical formula is called the ______

a)

Coefficient

b)

Element Symbol

c)

Subscript

d)

Atomic Number

41.

How many valence electrons does this Nitrogen atom have?

a)

15

b)

5

c)

2

d)

3

42.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

a)

H3PO4

b)

H2SO4

c)

H2O2

d)

H2O

43.

How many elements are in 6NaOH ?

a)

4

b)

6

c)

3

d)

1

44.

How many atom of Carbon are in C9H8O4

a)

1

b)

8

c)

12

d)

9

45.
How many MOLECULES are in the following compound:  CaCO3
a)
1
b)
3
c)
5
d)
0
46.
How many ATOMS are in the following compound:  C2H4O2
a)
3
b)
8
c)
1
d)
6
47.
These are the two particles located inside the nucleus of an atom 
a)
Protons and Electrons 
b)
Protons and Neutrons 
c)
Electrons and Neutrons 
d)
Neutrons and Molecules 

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