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Worksheets

Chemistry Review

Total questions: 156

Worksheet time: 2hrs 49mins

Name
Class
Date
1.
Which of the following is a chemical change?
a)
Iron rusting 
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
2.
Is this equation balanced?
a)
Yes
b)
No
c)
Not enough information
3.
What is the law of conservation of matter?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change.
c)
The mass of the reactants is the same as the mass of the products.
d)
The mass of the products is different than the mass of the reactants.
4.
Which of the following is evidence of a chemical change?  
a)
Change in state
b)
No new substance is formed
c)
Bubbles forming
d)
Change in shape
5.
This number is used to represent the number of each atom being represented.  What is the name of this number? 
a)
An Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
6.
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
7.
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
8.

The atomic number of oxygen is

a)

8

b)

15.9994

c)

16

d)

O

9.

Identify the elements in this compound.

a)

Carbon, Helium, Oxygen

b)

Chromium, Hydrogen, Oxygen

c)

Calcium, Hydrogen, Oxygen

d)

Carbon, Hydrogen, Oxygen

10.

The number of electrons in a Lithium atom is

a)

3

b)

4

c)

6

d)

7

11.

The opposite phase of melting is

a)

Condensation

b)

Vaporization

c)

Sublimation

d)

Freezing

12.

Electrons are

a)

Positively charged particles

b)

Negatively charged particles

c)

Neutral

13.

If an atom has 3 electrons, how many protons does it have?

a)

1

b)

2

c)

3

d)

4

14.

A group of elements that are shiny, conduct heat and electricity well is called

a)

Metals

b)

Non-metals

c)

Metalloids

15.

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

a)

Atom

b)

Element

c)

Compound

d)

Mixture

16.

What does the nucleus of an atom contain?

a)

Electrons and neutrons

b)

Protons and neutrons

c)

Electrons and protons

d)

DNA

17.

Which is an example of an heterogenous mixture?

a)

soy sauce

b)

salad

c)

tea

d)

guacamole

18.

Metals are located on what size of the periodic table?

a)

left

b)

right

c)

the stairway

d)

the bottom

19.
Which of the following is described as the basic unit of matter?
a)
Element
b)
Atom
c)
Molecule
d)
Compound
20.
In the atom diagram shown, E is pointing to
a)
An electron
b)
a proton
c)
a neutron
d)
the nucleus
21.

In the atom diagram shown, A is pointing to the darker particles, these are known as

a)

electrons

b)

protons

c)

neutrons

d)

the nucleus

22.
B and C are found in the ______ of an atom.
a)
electron cloud
b)
Space
c)
Nucleus
d)
Outside
23.
Which of the following is found in the nucleus of an atom?
a)
electrons
b)
neutrons
c)
The center of an atom, composed of protons and neutrons
d)
molecules
24.

In this chemical equation, the elements in red are the_______.

a)

Products

b)

Reactants

c)

Subscripts

d)

Coefficients

25.

What is the atomic mass of this atom?

a)

1

b)

3

c)

4

d)

7

26.
What is the atomic number of this atom?
a)
4
b)
5
c)
9
d)
none of the above
27.
What is a valence electron?
a)
an electron that is found in the outermost orbital of an atom. 
b)
an electron found in the innermost orbital of an atom.
c)
an electron found in the middle orbital.
28.

An ionic bond forms when

a)

valence electrons are shared back and forth (move between) two atoms.

b)

a sea of mobile electrons surround the cations and they then become negativly charged

c)

valence electrons are transferred from one atom to another, forming charged ions that are then pulled together by attraction between opposite charges

d)

none of the above

29.

Covalent bonds form when

a)

the electronegativity difference between two atoms is very large.

b)

electrons are completely transferred between two atoms.

c)

pairs of electrons are shared between two atoms.

d)

ions are held together by opposite charges.

30.
Why type of bond is forming between the atoms in the diagram?
a)
Ionic
b)
Covalent
31.
Is this image an example of covalent bonding?
a)
Yes
b)
No
32.

Using the information provided, determine how many electrons the a Boron atom contains.

a)

2.5

b)

5

c)

6

d)

10.81

33.
What type of bond is forming between oxygen and hydrogen?
a)
Ionic 
b)
Covalent
34.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
35.

This symbol indicates a _______.

a)

neutron

b)

proton

c)

electron

36.

What 2 elements make up water?

a)

Hydrogen and Carbon

b)

Carbon and Oxygen

c)

Hydrogen and Oxygen

d)

Oxygen and Helium

37.

How many molecules are in this formula?

a)

1

b)

2

c)

3

d)

6

38.

What information does a subscript number tell us?

a)

the number of atoms per element

b)

the number of molecules per formula

39.

What substance commonly exists in what 3 states of matter?

a)

Oxygen

b)

Carbon Dioxide

c)

Rust

d)

Water

40.

An electron is located ...

a)

in the nucleus.

b)

outside the nucleus.

41.

What is the atomic mass for this element?

a)

6

b)

12.0107

c)

6.0107

d)

18.0107

42.

How many molecules are in the Reactant?

a)

1

b)

2

c)

3

d)

4

43.

What information does the coefficient in an equation give us?

a)

the number of atoms per element

b)

the number of molecules per formula

44.

The center of an atom is called

a/an __________.

a)

atomic mass

b)

nucleus

c)

proton center

d)

energy shell

45.

How many neutrons are in an Calcium atom?

a)

20

b)

40.08

c)

60

46.

Which formula has 6 atoms of Carbon, 12 atoms of Hydrogen, and 6 atoms of Oxygen.

a)
b)
c)
d)
47.

The atomic number of an element is determined by the _________ of ________ in the nucleus.

a)

protons, neutrons

b)

number, electrons

c)

electrons, protons

d)

number, protons

48.

If the protons and electrons do not match, the atom is ____.

a)

neutral

b)

ion

49.

When gaseous water molecules lose __________, they become a liquid.

a)

energy

b)

heat

c)

motion

d)

all of the above

50.

How does a thermometer work? As the temperature increases the liquid in the thermometer takes up:

a)

more space

b)

less space

c)

stays the same

51.

As temperature increases, what happens to volume?

a)

it increases

b)

it decreases

c)

it stays the same

52.

A pot of water is placed on a hot stove. Small bubbles begin to appear at the bottom of the pot. The bubbles rise to the surface of the water and seem to pop or disappear. What are the bubbles made of?

a)

Air

b)

Gaseous oxygen and hydrogen

c)

Gaseous water/water vapor

d)

None of the above

53.

What happens to the water molecules when water at 24º C is cooled to 0º C and freezes?

a)

The molecules become less organized

b)

The molecules move faster

c)

The molecules break apart

d)

The molecules move more slowly.

54.

When water forms outside of a can of soda, the liquid is coming from

a)

Inside the can

b)

Water vapor in the air

55.

The average speed of molecules in a substance is called

a)

thermodynamics

b)

heat

c)

temperature

56.

The elements argon, xenon, neon, and helium are in the same

a)

period

b)

family

57.

How many protons, electrons, and neutrons are in the element silver?

a)

47 protons, 46 electrons, 61 neutrons

b)

61 protons, 46 electrons, 61 neutrons

c)

47 protons, 47 electrons, 61 neutrons

58.

Matter takes up space. What property of matter is this?

a)

mass

b)

volume

c)

density

d)

melting point

59.

What state of matter does a material have to be in for you to smell it?_

a)

solid

b)

liquid

c)

gas

d)

plasma

60.
_____________ are characteristics that help identify substances and tell them apart
a)
Properties
b)
Qualities
c)
Reactions
d)
Molecules
61.
Which of the following is NOT a compound? 
a)
O2
b)
MgO
c)
CH4
d)
H2O
62.
Which of the following is a chemical change?
a)
Ice cream melting
b)
Water boiling
c)
A cake baking
d)
White liquid and red liquid combining to make pink liquid
63.
Why is bubbling often a signal that a chemical reaction is occurring?
a)
It shows that the temperature is changing
b)
It shows that a new substance (gas) is being formed
c)
It shows that the state of matter is changing
d)
It shows that a substance has reached its boiling point
64.
What are the reactants in this chemical equation?
a)
Water and carbon dioxide
b)
Water, carbon dioxide, heat and light
c)
propane and oxygen
d)
propane, oxygen and carbon dioxide
65.
Does this image prove the Law of Conservation of Mass?
a)
Yes
b)
No
66.
Bananas turning rotten: chemical change or physical change? 
a)
Chemical Change
b)
Physical Change
67.
Does this image of water molecules represent boiling or electrolysis?
a)
Boiling
b)
Electrolysis
68.
Which is the correct word equation for the following reaction? 
When iron is exposed to air and water over time, a chemical reaction occurs.  The iron (Fe) reacts with the oxygen (O2) to form a reddish substance called iron oxide (Fe2O3).  You may have seen this on buildings, subway rails, or pipes that are made of iron and are outside!
a)
Iron Oxide --> Iron + Oxygen
b)
Iron Oxide + Oxygen --> Iron
c)
Iron + Oxygen --> Iron Oxide
d)
Iron + Iron Oxide --> Oxygen
69.
The difference between an atom and a molecule is that:
a)
Atoms are made of more than one molecule
b)
Molecules are made of two atoms of the same type stuck together
c)
Molecules are made of more than one atom stuck together
d)
Molecules are small and atoms are large. 
70.

Which of the following shows a physical change of the original substance?

a)

A and C

b)

B and C

c)

A and D

d)

B and D

71.

When two liquids are mixed together, the mixture's temperature increases rapidly. Is this a chemical or physical change?

a)

Physical

b)

Chemical

c)

Neither

d)

Both

72.

Oxygen is a non-metal. Which side of the periodic table would you find oxygen on?

a)

Left

b)

Top

c)

Right

d)

Bottom

73.

Select all that are true about compounds.

a)

They are made of one element.

b)

They are made of two or more elements.

c)

Elements chemically combine to form a compound.

d)

Compounds can be easily broken down into elements.

74.

Select all that are true about elements

a)

Found on the periodic table

b)

Has one capital letter in its atomic symbol

c)

We know about 100 elements currently

d)

They are a pure substance

75.

Two substances are mixed together. Which of these would tell you a chemical change occurred?

a)

A powder dissolved in a liquid

b)

Dye is one of the substances which caused a color change

c)

A solid is produced when two liquids are mixed together

d)

Water is heated to its boiling point

76.

How many elements are in this list:  HH , CO2CO_2 , CaCa  , H2OH_2O , OO ,  NaNa    

a)

6

b)

2

c)

4

d)

0

77.

How many compounds are in this list:  HH , CO2CO_2 , CaCa  , H2OH_2O , OO ,  NaNa    

a)

6

b)

2

c)

4

d)

0

78.

Why do you burn your hand on a metal left in the sun, but not a nonmetal found in the same spot? (Select all that apply)

a)

Metals conduct heat

b)

Metals are reactive

c)

Nonmetals do not conduct heat

d)

Nonmetals are brittle

79.


How many types of elements are in this compound:
 C8H9NO2C_8H_9NO_2  

a)

1

b)

3

c)

4

d)

20

80.

Metalloids have properties of metals and nonmetals.

a)

True

b)

False

81.

Ions are elements that have a:

a)

proton

b)

neutron

c)

electron

d)

charge

82.

A chemical reaction has two parts: the (BLANK) and the products.

a)

Elements

b)

Compounds

c)

Reactants

d)

None of these

83.

Covalent bonds are:

a)

weaker than ionic

b)

share electrons

c)

always use hydrogen

d)

none of these

84.

When fire burns it gives off heat, this is an (BLANK) reaction

a)

Endergonic

b)

Exergonic

c)

Dangerous

d)

Awesome

85.

To start a reaction you need:

a)

Light

b)

Power

c)

Fire

d)

Activation Energy

86.

Sodium (Na) and Chlorine (Cl) come together to make sodium chloride (NaCl), this is:

a)

salt

b)

powder

c)

gas

d)

sugar

87.

Ionic bonds are formed when electrons are:

a)

shared

b)

transferred

c)

blown up

d)

glued together

88.
Which of the following properties uniquely identifies every element?
a)
Number of valence electrons
b)
Phase at room temperature
c)
Number of protons
d)
Charge of the atom
89.
An elements reactivity and other chemical properties are determined by the number of….
a)
isotopes it has.
b)
oxidation states
c)
orbitals in an atom.
d)
valence electrons
90.
Which of the following properties of carbon distinguishes it from all other elements?
a)
Carbon has 6 protons in its nucleus.
b)
Carbon is a gray solid at room temperature.
c)
Carbon forms compounds with oxygen.
d)
Carbon can be found in Earth's crust.
91.
Based on this table it can be concluded that
a)
Sodium is the most reactive
b)
strontium is the best conductor
c)
phosphorous is the least stable
d)
aluminum has the most protons
92.
Which pair of elements have the same number of valence electrons?
a)
Lithium and Beryllium
b)
Magnesium and Sodium
c)
Lithium and Sodium
d)
Magnesium and Lithium
93.
What do elements in group 1 have in common?
a)
Number of valence electrons 
b)
Melting point of the element
c)
Possible number of bonds formed
d)
Metallic characteristics of the element
94.
Which element would have similar properties to Sulfur?
a)
Nitrogen
b)
Oxygen
c)
Flourine
d)
Chlorine
95.
Which of the following statements is true….
a)
A period is another name for a row
b)
Elements in the same period share similar physical properties
c)
Elements in the same period have the same number of energy shells surrounding the nucleus
d)
All of the above
96.
I which location on the Periodic Table are nonmetals found?
a)
Location 1
b)
Location 2
c)
Location 3
d)
Location 4
97.
According to the Law of Conservation of Mass,
a)
matter is always created in a chemical reaction.
b)
matter is always destroyed in a chemical reaction.
c)
matter is created and then destroyed in a chemical reaction
d)
matter is not created or destroyed in a chemical reaction.
98.
In which of the following examples has a chemical reaction occurred?
a)
After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.
b)
After turning on a blender filled with fruits, the fruit is chopped up and mixed together.
c)
After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.
d)
After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.
99.
When vinegar and baking soda are combined, bubbles begin to form.  Bubbles are evidence of a chemical reaction because they - 
a)
pop when they are touched.
b)
show that a gas is forming.
c)
form at a fast rate.
d)
are generally transparent.
100.
In an experiment, two flasks of unknown, clear liquids are combined in a beaker and the following observations are obtained: •Solution color remains clear.
•The amount of solution in the beaker increased.
•Solution temperature changed from 10°C to 20°C.
•Some of the liquid remained in the flasks.
How many of the listed observations indicate a new substance was formed?
a)
1
b)
2
c)
3
d)
4
101.

Which of the following is NOT true about the periodic table?

a)

Atomic mass is equal to the number of neutrons.

b)

Elements listed by their (increasing) atomic mass.

c)

Groups are the elements listed in columns.

d)

Periods are the elements listed in rows of 8 (for most rows).

102.

Which of the following are true about gas molecules? Choose two.

a)

the particles move about quickly

b)

the particles are far apart

c)

the particles move slowly and vibrate in place

d)

the particles are close together

103.

Which of the following chemical formulas has a subscript?

1. H2O

2. 2HCl

3. NaCl

a)

1 only

b)

2 only

c)

3 only

d)

1 and 2

104.

Which of the following are ways a mixture can be separated?

a)

all of these.

b)

sifting/straining

c)

evaporating

d)

dissolving

105.

Choose the correct chemical formula for the molecule

a)

NaCl

b)

NACL

c)

NaCL

d)

ClNa

106.

How many atoms are in the following chemical formula?

2CaCO3

a)

10

b)

8

c)

4

d)

5

107.

How many atoms are in the following chemical formula?

C6H12O6

a)

24

b)

3

c)

18

d)

12

108.

What is the atomic number of the atom?

a)

6

b)

12

c)

18

d)

3

109.

What is the atomic number of the following atom?

a)

20

b)

40

c)

60

d)

10

110.

A thermometer is heated. The volume of the liquid inside of the thermometer increases, and the level of the liquid rises. What happens to the mass of the liquid in the thermometer as the level of liquid rises?

a)

The mass stays the same.

b)

The mass increases.

c)

The mass decreases.

d)

It depends on the type of liquid.

111.

An element is...

a)

a group of atoms bonded together in a set ratio

b)

a substance made of one type of atom

c)

a substance made up of 2 atoms

d)

a group of atoms bonded together

112.

Which of the following is a heterogeneous mixture?

a)

Soda

b)

Coffee

c)

milk

d)

spaghetti

113.

According to the Law of Conservation of mass the mass of the _________ must equal the mass of the _________.

a)

compounds, mixtures

b)

reactants, products

c)

elements, chemicals

d)

substances, destroyed

114.

What are electrons on the outer shell of an atom called?

a)

2-8-8 rule

b)

happy electrons

c)

valence electrons

d)

outer electrons

115.

If an atom is missing 2 electrons in its valence shell it will _______ electrons.

a)

take

b)

give

116.

If an atom has 5 valence electrons it will __________ electrons.

a)

give

b)

take

117.

Which element is in group 4 of the periodic table?

a)

Titanium (Ti)

b)

Berylium (Be)

c)

Potassium (K)

d)

Lithium (Li)

118.

Which element is in period 2 of the periodic table?

a)

Magnesium (Mg)

b)

Carbon (C)

c)

Phosphorous (P)

d)

Krypton (Kr)

119.

According to the pH scale above, which of the following is the strongest acid?

a)

stomach acid

b)

tomato juice

c)

hand soap

d)

bleach

120.

Which picture represents a compound?

a)

A

b)

B

c)

C

d)

D

121.

In the reaction above, what are the reactants?

a)

glucose and oxygen

b)

water

c)

water and carbon dioxide

d)

carbon, oxygen, and hydrogen

122.

To balance the following equation, what coefficient should be in front of the Ag2OAg_2O ?
____  Ag2OAg_2O   🡪 ____ Ag + ____ O2O_2  

a)

1

b)

2

c)

3

d)

4

123.
How many molecules in 13NaHCO3 ?
a)
13
b)
4
c)
78
d)
Answer not provided
124.
How many total atoms in 4NaHCO3 ?
a)
24
b)
4
c)
16
d)
15
125.
Which is NOT an evidence of a chemical reaction?
a)
melting
b)
temperature change
c)
odor change
d)
production of a gas
126.
Is this a chemical reaction?
H2O (liquid) + NaCl→ H2O (gas) + NaCl
a)
Yes
b)
No
127.
Is this a chemical reaction?
CH4 + O2 → CO2 + H2O
a)
No
b)
Yes
128.
40 grams of Sodium were reacted with 40 grams of Chlorine.  How many grams of salt were produced?
a)
80 grams
b)
40 grams
c)
20 grams
d)
120 grams
129.
Is this equation balanced?
3H2  + N2 → 2NH3
a)
Yes
b)
No
130.
Does this equation obey the Law of the Conservation of Matter?
KMnO4 + HCl → KCl + 2MnOH + 2H2O
a)
Yes
b)
No
131.
Which two elements will react in similar ways?
a)
Nitrogen and Phosphorus
b)
Nitrogen and Fluorine
132.
Which element has 3 valence electrons and 4 rings?
a)
Gallium
b)
Silicon
c)
Scandium
133.
An atom with 15 protons and a mass of 35 has how many neutrons?
a)
20
b)
35
c)
15
d)
50
134.
An element which is malleable, ductile and has luster will be found on the _____ side of the zig-zag line on the periodic table.
a)
left
b)
right
135.
These elements are inert.
a)
Noble gases
b)
Group 1A
c)
Group 7A
136.
Covalently bonded molecules are made of atoms that
a)
share electorns
b)
shoot their electrons out into space
c)
move their electrons to the nucleus of the atom
d)
give electrons to and accept electrons from each other
137.
Ionically bonded compounds are made of atoms that 
a)
share electrons
b)
shoot their electrons out into space
c)
move their electrons to the nucleus of the atom
d)
give electrons to and accept electrons from each other
138.

Pure water has a pH of

a)

6

b)

15

c)

3

d)

7

139.

Which is a compound?

a)

Nitrogen (N2)

b)

Neon (Ne)

c)

Ozone (O3)

d)

Ammonia (NH3)

140.

Read the equation.                2Ca + O2→ 2CaO2Ca\ +\ O_2\rightarrow\ 2CaO                     What is the product of the reaction?

a)

metal

b)

mixture

c)

solution

d)

compound

141.

Which of these is an element?

a)

KBr

b)

O2

c)

2KCl

d)

FeO2

142.

The compound potassium sulfate, K2SO4 , is composed of

a)

2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen.

b)

2 atoms of potassium, 4 atoms of sulfur, and 4 atoms of oxygen.

c)

two molecules of potassium and one molecule of sulfate.

d)

one molecule of potassium and two molecules of sulfate.

143.

A researcher uses several procedures to separate a rock sample into different chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be separated into other chemicals, then it is BEST described as

a)

a compound.

b)

a mixture.

c)

a solution.

d)

an element.

144.

A researcher uses several procedures to separate a rock sample into different chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be separated into other chemicals, then it is BEST described as

a)

a compound.

b)

a mixture.

c)

a solution.

d)

an element.

145.

Where are the most reactive nonmetals located on the periodic table?

a)

the uppermost complete row of the table

b)

the rows at the bottom of the table connecting two sections

c)

the column at the far left side of the table

d)

the second column from the right side of the table

146.

Which characteristic of an element determines its placement in the periodic table?

a)

mass

b)

size

c)

number of neutrons

d)

number of protons

147.

Where are the most reactive metals located on the periodic table?

a)

the uppermost complete row of the table

b)

the rows at the bottom of the table connecting two sections

c)

the column at the far left side of the table

d)

the second column from the right side of the table

148.

Elements in the same column of the periodic table of the elements all

a)

have the same number of protons.

b)

share the same atomic structure.

c)

have similar physical characteristics.

d)

share the same number of neutrons.

149.

The table shows properties of several elements. Which element would Element X most likely be grouped with on the periodic table?

a)

Calcium (Ca)

b)

Chlorine (Cl)

c)

Copper (Cu)

d)

Potassium (K)

150.

Elements in the periodic table of the elements are organized into columns and rows.The columns are organized to show the

a)

similarities of the reactivity in groups.

b)

number of neutrons in a column.

c)

sum of atomic weights per column.

d)

amount of radioactivity in each group.

151.

A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?

a)

A chemical change took place.

b)

The lithium was dissolved by the water.

c)

Dissolved gases were released.

d)

Water was vaporized.

152.

Which task in the kitchen is an example of a physical change?

a)

frying an egg

b)

baking a cake

c)

melting butter

d)

toasting bread

153.

Which of the following is a physical change?

a)

Baking cookies

b)

Rust forming on a bike

c)

Sharpening a pencil

d)

Hydrogen and oxygen creating water.

154.

Balance this equation: K + O₂ → K₂O

a)

4K + 8 O2 → 16 K2O

b)

4K + 1 O2 → 2K2O

c)

K2 + O2 → K2O2

d)

2K + O2 → K22O

155.

Is density a physical or chemical property?

a)

Physical

b)

Chemical

156.

How do you find the number of neutrons in an atom?

a)

It is the same as the atomic mass.

b)

It is the same as the atomic number.

c)

Round the atomic mass and subtract the number of protons.

d)

You guess.

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