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EOC Chemistry Review 2025

Total questions: 100

Worksheet time: 1hrs 17mins

Name
Class
Date
1.

Water freezes to form ice. What type of change is this?

a)

Physical change

b)

Chemical change

2.

An atom with 12 neutrons and 8 protons has a mass of:

a)

12

b)

8

c)

20

d)

4

3.

The nucleus of an atom is ___ charged and contains nearly all the ___ of the atom.

a)

neutrally; size

b)

negatively; mass

c)

positively; mass

4.

A proton has a ___ and is found in the ___ while an electron has a ___ and is found in the ___.

a)

positive charge, nucleus; negative charge, electron cloud

b)

negative charge, nucleus; positive charge, electron cloud

c)

positive charge, electron cloud; negative charge, nucleus

d)

negative charge, electron cloud; positive charge, nucleus

5.

Why is an atom electrically neutral?

a)

Neutrons = protons and electrons

b)

Neutrons = electrons

c)

Protons = electrons

d)

Protons = neutrons

6.

What subatomic particle is represented by letter B?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

7.

What subatomic particle is represented by letter C?

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

8.

What subatomic particle is represented by letter A?

a)

Proton

b)

Neutrons

c)

Electrons

d)

Quarks

9.

Anything that has mass and takes up space is:

a)

matter

b)

energy

c)

work

d)

chemical

10.

An isotope is:

a)

Same element with different protons

b)

Same element with different electrons

c)

Same element with different neutrons

d)

Same element with a long half-life

11.

Salt (NaCl) is a:

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

12.

A sulfur atom with 16 protons and 16 electrons that gains 2 electrons becomes:

a)

2+

b)

2–

c)

neutral

d)

charge cannot be determined

13.

For isotope ¹⁴₆X, element X and neutrons are:

a)

Silicon, 8

b)

Silicon, 6

c)

Carbon, 8

d)

Carbon, 6

14.

Which image(s) represent a mixture?

a)

1 only

b)

2 only

c)

4 only

d)

2 and 4

15.

Which image(s) represent a pure element?

a)

1 only

b)

1 and 2 only

c)

1 and 3 only

d)

1 and 4

16.

Which image represents a pure compound?

a)

3 only

b)

2 only

c)

2 and 3 only

d)

4 only

17.

Where in the density column would milk be?

Substance — Density (g/mL)
Milk — 1.03
Gasoline — 0.70
Chloroform — 1.47
Alcohol — 0.80

a)

A

b)

B

c)

C

d)

D

18.

Density of a 20 g block with volume 5 cm³:

a)

0.25 g/cm³

b)

4 g/cm³

c)

100 g/cm³

d)

25 g/cm³

19.

Evidence of chemical reaction in the zinc + CuSO₄ reaction:

a)

Zinc stays silver & shiny

b)

A dark solid forms on zinc

c)

These are all physical changes

d)

CuSO₄ turns blue when zinc is added

20.

Gatorade is a:

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

21.

Trail mix is a:

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

22.

Magnesium (Mg) is a(n):

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

23.

The Alkali Metals are group:

a)

A

b)

B

c)

C

d)

D

24.

The Noble Gases are group:

a)

A

b)

B

c)

C

d)

D

25.

Which group typically forms +2 ions (loses 2 electrons)?

a)

A

b)

B

c)

C

d)

D

26.

Why does lithium react vigorously with water?

a)

Mass of 6.94 means 7 protons causing reactivity

b)

One valence electron it readily loses

c)

“Li” means liquid at room temp

d)

Low atomic number makes it unreactive

27.

The period 3 halogen is:

a)

Br

b)

Ar

c)

Mg

d)

Cl

28.

Elements in the first period:

a)

2

b)

7

c)

8

d)

18

29.

Daughter nucleus of radon-222 after alpha decay:

a)

Polonium-218

b)

Radon-218

c)

Polonium-222

d)

Polonium-226

30.

Nuclear process producing energy in the Sun:

a)

Fission

b)

Fusion

c)

Propulsion

d)

Supernova

31.

What nuclear process is used in all nuclear power plants?

a)

Fission

b)

Fusion

c)

Propulsion

d)

Super Nova

32.

The Octet Rule states:

a)

Atoms gain/lose/share electrons to reach 8 valence electrons

b)

Atoms exist in 8 shapes

c)

Atoms are shaped like octagons

d)

None of the above

33.

If an atom loses an electron, it becomes ___; if it gains one, it becomes ___.

a)

negative; positive

b)

positive; negative

c)

negative; negative

d)

positive; positive

34.

Which trial in Model 2 matches the reaction in Model 1?

a)

Trial 1

b)

Trial 2

c)

Trial 3

d)

Trial 4

35.

Controlled variables in Model 2:

a)

Initial Temperature

b)

Room Pressure

c)

Volume of Vinegar

d)

All of these

36.

Dependent variable in Model 2:

a)

Final Temperature

b)

Room Pressure

c)

Volume of Vinegar

d)

Number of Alka-Seltzer Tablets

37.

Independent variable in Model 2:

a)

Temperature

b)

Room Pressure

c)

Volume of Vinegar

d)

Number of Alka-Seltzer Tablets

38.

 Joel claims that “Bright White Toothpaste” removes tooth enamel stains better than all other brands. Which of the following should be documented as evidence to support his claim?

Evidence for toothpaste claim should include:

a)

Amount of toothpaste used

b)

Shade before and after brushing

c)

Toothbrush type

d)

Tooth size

39.

Choose the correct measurement:

a)

43.0 mL

b)

45.0 mL

c)

4.5 cm

d)

44.0 L

40.

Evidence of chemical change during “mix” phase:

a)

Change in temperature

b)

Change in pressure

c)

Formation of bubbles

d)

Both change in temperature and formation of bubbles

41.

Flammability of a substance is a ​ (a)  

Choose from the below words
Chemical Property
Physical Property
Solution
42.
Question Image

Match the following evidence with the observation

a)

1.

Physical Change - because it is melting.

b)

2.

Chemical Change - because it is burned.

c)

3.

Physical Change - because it is bent.

d)

4.

Physical Change - because size changes.

e)

5.

Chemical change - because acids/bases.

43.

A substance that has a definite volume, but no definite shape is a (a)  

Choose from the below words
Liquid
Solid
Gas
Chemical Change
Physical Change
Temperature
Volume
Mass
Mixture
Solution
44.

​ (a)   is the amount of matter in an object.

Choose from the below words
Mass
Weight
Volume
45.

A substance with a definite volume and shape is a ​ (a)  

Choose from the below words
Solid
Chemical Change
Mixture
Mass
Physical Change
Solution
Temperature
Liquid
Volume
Gas
46.
Question Image

Match the following terms to their proper defintions

a)

Matter

1.

Anything that has mass and volume

b)

Mass

2.

The amount of matter in an object

c)

Volume

3.

The amount of space an object takes up

d)

Atoms

4.

The smallest particle of an element that still has the properties of that element

e)

Elements

5.

A substance that is made up of only one kind of atom.

47.

How many protons are in carbon?

a)

12

b)

6

c)

0

d)

7

48.
The protons and neutrons are inside of the nucleus, and contain almost all of _____
a)
the charge of the atom
b)
the volume of the atom
c)
the mass of the atom
d)
the kinetic energy of the atom
49.

Which of the following particles orbits the nucleus of an atom?

a)

electron

b)

proton

c)

neutron

d)

quark

50.

Which of the following atomic particles has NO CHARGE?

a)

proton

b)

electron

c)

neutron

d)

positron

51.
What is the Atomic Number of this element?
a)
11
b)
12
c)
23
d)
1
52.

Lithium-7 has ​3 ​ (a)   and 4 ​ (b)   ​ and has 6.94 for its ​ (c)   .

Choose from the below words
protons
neutrons
average atomic mass
53.
Question Image

Match the following

a)

number of protons

1.

18

b)

number of neutrons

2.

22

c)

mass number

3.

40

54.

Select the two atoms that are isotope of each other

A
B
C
55.

Look at this picture of a Titanium atom. This isotope of Titanium has:

​ (a)   protons

22 electrons

​ (b)   neutrons

mass number of ​ (c)  

Choose from the below words
22
26
48
70
47
21
56.

Match the following terms to their correct definitions.

a)

Atoms with the same number of protons but different numbers of neutrons

1.

Isotope

b)

Total number of protons and neutrons in the nucleus

2.

Mass Number

c)

The weighted average of the masses of the isotopes of an element

3.

Atomic Mass

57.

Label the parts of the reaction.

a)

Reactants

b)

Products

1
2
1)
2)
58.

fireworks exploding ​ (a)  

Choose from the below words
chemical change
physical change
59.
Question Image

Match the following

a)
1.

Physical Change

b)
2.

Chemical change

c)
3.

Chemical Change

d)
4.

Physical Change

e)
5.

Chemical change

60.

Which is the product.

A
B
C
61.
Question Image

Match the correct part of the chemical equation with its descriptor.

a)

A

1.

Reactants

b)

B

2.

Yields

c)

C

3.

Products

d)

D

4.

Subscript

e)

E

5.

Coefficient

62.

Label the states of matter

a)

liquid

b)

gas

c)

solid

d)

ice

1
2
3
1)
2)
3)
63.
Question Image

Match the following terms to their proper defintions

a)

Matter

1.

Anything that has mass and volume

b)

Mass

2.

The amount of matter in an object

c)

Volume

3.

The amount of space an object takes up

d)

Atoms

4.

The smallest particle of an element that still has the properties of that element

e)

Elements

5.

A substance that is made up of only one kind of atom.

64.
Question Image

Match the following

a)

Atomic Number

1.

8

b)

Average Atomic Mass

2.

15.999

c)

Symbol

3.

O

d)

Name

4.

Oxygen

65.
Question Image

Match the following

a)

Element Symbol

1.

Al

b)

Charge

2.

+3

c)

Mass Number

3.

27

d)

Atomic Number

4.

13

66.

Label the parts of the periodic table​

a)

Metals

b)

Nonmetals

c)

Metalloids

1
2
3
1)
2)
3)
67.

Label the following groups

a)

halogens

b)

transition metals

c)

alkali metals

d)

alkaline earth metals

1
2
3
4
1)
2)
3)
4)
68.

Each horizontal row on the periodic table is called a what?

(a)  
Choose from the below words
Group
Cloumn
Period
Family
69.

Which of the following is a heterogeneous mixture?

a)

Salt water

b)

Air

c)

Sand and iron filings

d)

Distilled water

70.

Which subatomic particle determines the identity of an element?

a)

Electron

b)

Neutron

c)

Proton

d)

Positron

71.

What is the charge of a neutron?

a)

Double positive

b)

Neutral

c)

Negative

d)

Positive

72.

Which of the following best describes a chemical compound?

a)

A substance formed when two or more elements are chemically bonded

b)

A mixture of two elements that can be separated physically

c)

A solution of metals

d)

A substance made of only one type of atom

73.

Which subatomic particle determines the identity of an element?

a)

Proton

b)

Quark

c)

Electron

d)

Neutron

74.

What is the charge of an ion formed when an atom loses one electron?

a)

0

b)

1+

c)

1–

d)

2–

75.

Which subatomic particle has no electric charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Quark

76.

What is the main difference between a compound and an element?

a)

Elements have more mass than compounds

b)

Compounds are always solids; elements are always gases

c)

Elements cannot be broken down by chemical means; compounds can

d)

Elements are made of atoms; compounds are made of molecules

77.

What is the atomic number of oxygen?

a)

8

b)

12

c)

16

d)

6

78.

Which of the following is a chemical change?

a)

Melting ice

b)

Boiling water

c)

Rusting iron

d)

Breaking glass

79.

Which of the following is a chemical property?

a)

Color

b)

Density

c)

Ability to rust

d)

Melting point

80.

Which subatomic particle determines the atomic number of an element?

a)

Proton

b)

Neutron

c)

Electron

d)

Photon

81.

What is the state of matter of oxygen at room temperature?

a)

Gas

b)

Plasma

c)

Liquid

d)

Solid

82.

Which of the following is a homogeneous mixture?

a)

Sand and iron filings

b)

Salt water

c)

Salad

d)

Granola bar

83.

Which group on the periodic table contains highly reactive metals?

a)

Group 1

b)

Group 17

c)

Group 2

d)

Group 18

84.

Which of the following best describes a compound?

a)

Made of only metals

b)

Made of only one type of atom

c)

Made of two or more elements chemically combined

d)

Made of substances physically mixed

85.

Which group on the periodic table contains the noble gases?

a)

Group 1

b)

Group 17

c)

Group 18

d)

Group 2

86.

What is the charge of a sodium ion (Na) after it loses one electron?

a)

1–

b)

neutral

c)

1+

d)

2+

87.

Which of the following is a homogeneous mixture?

a)

Trail mix

b)

Granite

c)

Salt water

d)

Sand and iron filings

88.
What does the symbol -10e represent
a)
alpha
b)
beta
c)
gamma
d)
the zero element
89.
What is the symbol for an alpha particle?
a)
42He
b)
0-1e
c)
0+1 e
d)
10n
90.

What is the symbol for a gamma ray?

a)
b)
c)
d)
91.
What do these symbols represent?
a)
alpha particle
b)
beta particle
c)
neutron
d)
gamma ray
92.

Solve this equation.

85209At = ___ + 24He

a)

83205Bi

b)

86209Rn

c)

81207Tl

d)

85208At

93.

What type of nuclear decay is shown here

13756Ba →→ 13756Ba + γ rays

a)

alpha

b)

beta

c)

gamma

94.

Solve this equation for.

614C = ___ + -10e

a)

410Be

b)

714N

c)

210He

d)

613C

95.

How are elements arranged on the periodic table?

a)

By their color

b)

By their atomic weight

c)

By the number of protons

d)

By their chemical properties

96.

Which of the following is a heterogeneous mixture?

a)

Saltwater

b)

Air

c)

Salad

d)

Water

97.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
98.
This picture represents which of the following?
a)
Element
b)
Compound
c)
Mixture
99.

An example of a physical property is ___.

a)

magnetism

b)

reactivity with oxygen

c)

flammability

d)

non-reactive

100.

Example of a physical property is ___.

a)

odor

b)

burns in air

c)

reacts with water to create hydrogen gas

d)

rust

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