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Chemistry Unit Review

Total questions: 89

Worksheet time: 55mins

Name
Class
Date
1.

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

a)

1

b)

2

c)

3

d)

4

2.

Ozone and Oxygen molecules are the same substance because they both are made only of oxygen atoms.

a)

true

b)

false

3.

What is the chemical symbol for carbon?

a)

C

b)

Ca

c)

Cn

d)

Crn

4.

Molecules bonded together make up atoms.

a)

true

b)

false

5.

How many atoms make up one molecule of laughing gas?

a)

1

b)

2

c)

3

d)

4

6.

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

7.

In a chemical reaction or change a new substance is not created.

a)

true

b)

false

8.

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

a)

endothermic

b)

exothermic

9.

Atoms are mostly made up of...

a)

empty space

b)

electrons

c)

solids and liquids

10.

What did the second man drink?

a)

Arsenic

b)

Hydrogen Peroxide

c)

Helium Oxolate

11.

What is Batman's favorite element?

a)

Na

b)

H

c)

O

d)

Cl

12.

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

13.

protons

a)

negative charge, nucleus

b)

positive charge, shells

c)

positive charge , nucleus

d)

neutral charge, nucleus

14.

neutrons

a)

no charge, shells

b)

positive charge, nucleus

c)

neutral, no charge, nucleus

d)

negative charge, shells

15.

electrons

a)

no charge, nucleus

b)

positive charge, nucleus

c)

negative charge, shells

d)

negative charge, nucleus

16.

atomic number

a)

number of protons/stands for an element

b)

number of neutrons

c)

number of electrons

d)

number of protons and neutrons

17.

mass number

a)

number of protons

b)

number of electrons

c)

number of protons and electrons

d)

number of protons and neutrons

18.

atomic symbol

a)

capital letter

b)

lowercase letter

c)

2 capital letters

d)

2 lowercase leters

19.

lst shell holds

a)

2

b)

8

c)

18

d)

32

20.

2nd shell holds

a)

2

b)

8

c)

18

d)

32

21.

3rd shell holds

a)

2

b)

8

c)

18

d)

32

22.

4th shell holds

a)

2

b)

8

c)

18

d)

32

23.

same number of protons, different number of neutrons

a)

atomic number

b)

mass number

c)

isotope

d)

ion

24.

a charged atom

a)

neutral

b)

isotope

c)

ion

d)

nucleus

25.
What is a reactant?
a)
The starting substance
b)
The ending substance
26.
What is a product?
a)
The starting substance
b)
The ending substance
27.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).
a)
Hydrogen and Oxygen
b)
water
28.
Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the product(s).
a)
Hydrogen and oxygen
b)
water
29.
Angelina mixes 2 substances together in a beaker. The beaker becomes hot and the liquid changes color.
Did a chemical reaction occur?
a)
yes, because the properties changed and a new substance was made.
b)
no, because the properties did not change.
30.
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
31.
What is a precipitate?
a)
a change in color 
b)
a change in temperature
c)
a solid formed
d)
a gas formed
32.
Alex wants to mix two substances together and to find out if a chemical reaction happens. What should he do?
a)
test the solubility before and after mixing
b)
measure the volume before and after mixing
c)
measure the mass before and after mixing
d)
test the density of the before substance but not the after substances.
33.
a student mixes  apple juice, water, and cinnamon together. Did a chemical reaction occur?
a)
Yes, because the apple juice changed the color of the water.
b)
yes, because the temperature stayed the sam
c)
no, because the properties stayed the same.
d)
yes, because dissolving is always a chemical reaction.
34.
Burning is always a chemical reaction.
a)
True
b)
false
35.
Sandra was burning a vanilla candle. Was there a chemical reaction?
a)
no, because burning is never a chemical reaction.
b)
Yes, because the properties of the wick changed.
c)
yes, because heat was added.
d)
no, because the ash formed was a different substance.
36.
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.
37.
Which of the following is a chemical reaction?
a)
Burning bread in the toaster.
b)
melting wax in a microwave.
c)
dissolving salt in water
d)
boiling water to make steam.
38.
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
39.

What is a  pure substance that is made of two or more elements chemically combined in a set ratio. Ex: CO2 has a set ratio of 1:2, meaning for every one carbon atom there are two oxygen atoms.

a)
element
b)
compound
c)
mixture
d)
salad
40.

What is an atom which has gained or lost electrons called?

a)
isotope
b)
atom
c)
ion
d)
balanced
41.
What type of property can only be observed by changing the substance into a new substance. Ex: Flammability, oxidation
a)
chemical
b)
physical
42.
What type of mixture contains visible parts (like a salad or a pizza or granite)
a)
homogenous
b)
heterogenous
43.
What is matter
a)
Anything which is solid
b)
Anything that takes up space and has mass
c)
when something is wrong
44.
Gold is an example of a(n) 
a)
pure element
b)
pure compound
c)
pure mixture
45.
Air is an example of a(n)
a)
element
b)
compound
c)
heterogenous mixture
d)
homogenous mixture
46.
In a mixture items can be separated __________
a)
chemically
b)
physically
47.
Phase changes (going from a solid to a liquid to a gas) are what types of changes?
a)
chemical
b)
physical
48.
Elements in a compound can be separated __________
a)
physically
b)
chemically
49.
who developed the modern day periodic table of elements?
a)
Darwin
b)
Shultz
c)
Hooke
d)
Mendeleev
50.
On the Periodic Table each element increases by one _________
a)
electron
b)
proton
c)
neutron
d)
letter
51.
A row across the Periodic Table where each element has the same number of energy shells
a)
column
b)
family
c)
period
52.
In a family or column, the elements have similar properties because they all have the same number of
a)
protons
b)
neutrons
c)
valence electrons
d)
electrons
53.
What is the octet rule?  How many valence electrons can the first three periods hold?
a)
8
b)
2
c)
2 8 8
d)
2 8 16
54.
Whether or not bonds form is due to the ?????
a)
valence electron configurations
b)
protons
c)
atomic mass
d)
chance
55.
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
56.
In this type of bond electrons are shared by two non-metals
a)
ionic
b)
covalent
c)
subatomic
57.
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
58.
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
59.

This is the smallest particle into which an element can be divided and still be the same substance.

a)

Mixture

b)

Compound

c)

Element

d)

Atom

60.

The negatively charged subatomic particles that are located in energy levels around the nucleus

a)

Protons

b)

Neutrons

c)

Electrons

d)

Ions

61.

Positively charged subatomic particles located in the nucleus of an atom

a)

protons

b)

neutrons

c)

electrons

d)

ions

62.

The neutral subatomic particles located in the nucleus of an atom

a)

protons

b)

neutrons

c)

electrons

d)

ions

63.

The outer most electrons of an atom

a)

valance electrons

b)

diatomic molecules

c)

bohr models

d)

isotopes

64.

Atoms tend to gain, lose, or share electrons in order to achieve a full outer energy level

a)

bohr model

b)

octet rule

c)

isotopes

d)

valance electrons

65.

Loss or gaining of an electron changes and atom into __________.

a)

isotopes

b)

valance electrons

c)

bohr models

d)

ions

66.

Atoms that gain or lose a neutron become ____________.

a)

isotopes

b)

bohr models

c)

valance electrons

d)

ions

67.

An atomic diagram that shows protons, neutrons, and all electrons

a)

valance electrons

b)

diatomic molecules

c)

bohr models

d)

isotopes

68.

Is a substance made up of only one kind of atom.

a)

pure substance

b)

element

c)

compound

d)

mixture

69.

Is a classification of matter that includes both elements and compounds

a)

pure substances

b)

elements

c)

compound

d)

mixtures

70.

Is the number of protons in an element

a)

atomic mass

b)

atomic number

c)

valance protons

d)

diatomic molecules

71.

Is the protons plus the neutrons

a)

valance electrons

b)

atomic number

c)

atomic mass

d)

bohr diagram

72.

The smallest particle in a chemical element or compound that has the chemical properties of that element or compound

a)

atom

b)

molecule

c)

element

d)

compound

73.

_________ are molecules of two atoms of the same element. Elements found is nature this way are, H2, O2, N2, F2, Cl2, Br2 and I2.

a)

valance electrons

b)

atomic mass

c)

atomic weight

d)

diatomic molecules

74.
Paper burning is a __________________ change. 
a)
physical
b)
chemical
75.
Dry ice (solid carbon dioxide) turning into carbon dioxide gas is a 
a)
physical change
b)
chemical change
76.
Which of these phrases describes the results of a chemical change? 
a)
charred wood, ash, and smoke 
b)
salt dissolving in water 
c)
gold nuggets melting 
d)
a dented car door
77.
An iron nail rusting is a _______________ change. The ________________ property of reactivity explains the iron’s ability to form a new substance. 
a)
physical, physical            
b)
physical, chemical 
c)
chemical, chemical 
d)
chemical, physical 
78.
Dissolving Kool-Aid into water is an example of a 
a)
physical change              
b)
chemical change
79.

Which example below is a chemical reaction?

a)

ice melting

b)

water boiling

c)

lighting a match

d)

grape juice freezing

80.
The following changes (melting wax, evaporating gasoline, freezing water) are all examples of
a)
nuclear changes.
b)
chemical changes.
c)
physical changes.
d)
a.  energy consumption.
81.
Which of these BEST describes a physical change?
a)
fireworks explode
b)
a log in the campfire turns into ashes
c)
rust forms on your bicycle
d)
the amount of water in a pan decreases
82.
The density of a piece of gold jewelry is often used to determine its purity. Density is what kind of property?
a)
chemical
b)
colligative
c)
extrinsic
d)
physical
83.
During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of. Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made of
a)
aluminum
b)
gold
c)
nickel
d)
zinc
84.
This table displays
a)
price values of the metals.
b)
chemical properties of the metals.
c)
physical properties of the metals.
d)
corrosive resistance of the metals.
85.
Consider the picture of the jar holding oil, syrup, and water. It would be easy to pour off the oil to separate from both the syrup and water because the liquids have different
a)
densities
b)
masses
c)
temperatures
d)
volumes
86.
Color, shape, texture, and size are _____________ properties of matter.
a)
chemical
b)
liquid
c)
physical
d)
solid
87.
A student takes four samples of a white crystalline solid and places each in a well plate. On top of each sample, she carefully places 20 drops of mystery liquids A, B, C and D. Her results for each well are:
The solid dissolves quickly in liquid A.
The solid remains unchanged with the addition of liquid B.
The white solid remains, but dissolves very slowly in liquid C.
When liquid D is added, fizzing occurs and the well becomes warmer.
In which well does a chemical change occur?
a)
a
b)
b
c)
c
d)
d
88.
Water freezes and melts at 0°C. Melting point is what kind of property?
a)
chemical
b)
colligative
c)
extensive
d)
physical
89.
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

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