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Worksheets

8th grade CBA #1 review

Total questions: 190

Worksheet time: 2hrs 7mins

Name
Class
Date
1.

Which element is this?

a)

Nickel

b)

Neon

c)

Sodium

d)

Nitrogen

2.

Name this element.

a)

Argon

b)

Chlorine

c)

Aluminum

d)

Boron

3.

Name this element.

a)

Neon

b)

Magnesium

c)

Sodium

d)

Manganese

4.

What is the atomic number of this atom?

a)

2

b)

4

c)

6

d)

8

5.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

6.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

7.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

8.

What is a valence electron?

a)

Electrons in the first energy shell

b)

Electrons in the second energy shell

c)

Electrons in the outer shell

d)

Total number of electrons

9.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

10.

What is the atomic number of this element?

a)

17

b)

18

c)

35

d)

35.453

11.

Use the periodic table below to determine the number of protons in Bromine (Br).

a)

35

b)

79.904

c)

36

d)

83.798

12.

How many valence electrons does this element have?

a)

12

b)

8

c)

2

d)

10

13.

Use your periodic table to determine the number of protons in Neon (Ne).

a)

18.998

b)

20.18

c)

10

d)

12

14.

What is the atomic mass for this element? (Round to the nearest WHOLE number.) (This information for this element can be found on the periodic table!)

a)

11

b)

19

c)

24

d)

23

15.

How many valence electrons does this element have?

a)

1

b)

2

c)

3

d)

4

16.

What element does this Bohr model represent?

a)

Carbon

b)

Boron

c)

Neon

d)

Nitrogen

17.

The sum of the number of protons and the number of neutrons is called the _____

a)

Atomic Number

b)

Atomic Mass

c)

Atomic Symbol

d)

Atomic Name

18.

In the Bohr model of the atom, what is the maximum number of electrons in the first shell?

a)

2

b)

8

c)

1

d)

6

19.

What is the atomic mass for this element? (Round to the nearest WHOLE number.) (This information for this element can be found on the periodic table!)

a)

17

b)

35

c)

18

d)

40

20.

How many valence electrons does this element have?

a)

1

b)

2

c)

3

d)

4

21.

Which of these are parts of the atom?

a)

Protons, ProAthletes, Neutrons

b)

Neutrons, Protons, Electrons

c)

Mitochondria, Electrons, Protons

d)

Oxygen

22.

Which of these has a negative charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Oatmeal

23.

Which charge does a proton have?

a)

Neutral

b)

Negative

c)

No charge- battery is dead

d)

Positive

24.

Neutrons have a ____________ charge.

a)

Neutral, or no charge

b)

Positive

c)

Negative

d)

Neutron? I don't know what that is!

25.

True or false: Atoms make up everything around you.

a)

True

b)

False

26.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
27.
Which two particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Molecules and Compounds
d)
Neutrons and Electrons
28.

Letter A is showing

a)

Neutrons

b)

Electrons

c)

Protons

d)

Nucleus

29.

What subatomic particle is found in the electron cloud?

a)

Neutrons

b)

Electrons

c)

Protons

d)

none

30.

Which subatomic particles make up the mass of an atom?

a)

protons only

b)

protons and neutrons

c)

protons, neutrons and electrons

d)

protons and electrons

31.

Which subatomic particle has No charge?

a)

Protons

b)

Ions

c)

Electrons

d)

Neutrons

32.

The negatively charged particles in an atom

a)

Proton

b)

Electron

c)

Neutron

d)

Electron Cloud

33.

The region inside an atom where electrons are likely to be found

a)

Proton

b)

Atom

c)

Electron Cloud

d)

Neutron

34.

What part is positive inside the nucleus?

a)

electron

b)

nucleus

c)

proton

d)

neutron

35.

What part is negative and exists in a cloud outside of the nucleus?

a)

electron

b)

neutron

c)

nucleus

d)

proton

36.

The core of an atom is made up of these two parts.

a)

electrons, protons

b)

protons, neutrons

c)

protons, nucleus

d)

neutrons, electrons

37.

The neutral particles are called the ------?

a)

protons

b)

electrons

c)

nucleus

d)

neutrons

38.

Label the atomic parts., their charge, and location.

(a)  

39.

The electron cloud contains only_________.

a)

nucleus

b)

neutrons

c)

electrons

d)

protons

40.

The atomic number is the number of _______ in an atom.

a)

protons

b)

neutrons

c)

protons and neutrons

d)

neutrons and electrons

41.

The mass number is the _______ inside one atom.

a)

number of electrons

b)

number of electrons and protons

c)

number of neutrons and protons

d)

number of neutrons

42.

To find the number of neutrons, you must

a)

Subtract atomic number from mass number. (Example: 14-7=7 neutrons)

b)

Subtract mass number from atomic number. (Example: 7-14= -7 neutrons)

43.

This negative particle is 1/1800 of the size of a neutron or proton- super tiny!

a)

nucleus

b)

electron

44.

The nucleus of an atom consists of neutrons and protons

a)

True

b)

False

45.

Which particle in an atom has a negative charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

46.

What particle in an atom has no charge?

a)

Proton

b)

Neutron

c)

Electron

47.

What particle has a positive charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

48.

This type of matter has 2 or more elements that are bonded together.

a)

Element

b)

Atoms

c)

Compounds

d)

Ions

49.

An objects size, color, and mass are chemical properties.

a)

True

b)

False

50.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
51.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
52.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
53.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
54.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
55.
Carbon is considered an element while carbon dioxide is considered a compound. This is because carbon dioxide is –
a)
a gas at room temperature.
b)
made of two different elements.
c)
given off by green plants.
d)
useful to human beings.
56.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
57.
What part of the atom is the arrow pointing to?
a)
nucleus
b)
proton
c)
electron shell
d)
electron
58.
If the number of protons equal the number of _____, the atom will have no charge
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
59.
An atom is made up mostly of
a)
protons
b)
gravity
c)
empty space
d)
electricity
60.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
61.
Which of the following is not a compound?
a)
HCl
b)
Cl
c)
NaCl
d)
CO2
62.
Salt has a chemical formula of NaCl.  Salt is a...
a)
Compound
b)
Element
c)
Mixture
d)
None of the Above
63.
A combination of substances that are not chemically combined is called a(n)____________. 
a)
mixture
b)
compound
c)
physical
64.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
65.

Which of the following terms is not a subatomic particle?

a)

Proton

b)

Neutron

c)

Electron

d)

Ion

66.

Which of the following have a positive charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

67.

Which of the following have a neutral charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

68.

Which of the following have a negative charge?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

69.

Which of the following particles would have a mass of one?

a)

Proton

b)

Neutron

c)

Electron

70.

Which of the following particles would have a mass of almost zero?

a)

Proton

b)

Neutron

c)

Electron

71.

Which of the following particles would be found within the nucleus?

a)

Proton

b)

Neutron

c)

Electron

72.

Which of the following particles would be found outside of the nucleus?

a)

Proton

b)

Neutron

c)

Electron

73.

What is the name of the positively charged particle with a mass of 1?

(a)  

74.

What is the name of the neutral particle with a mass of 1?

(a)  

75.

What is the name of the negatively charged particle with a mass of almost zero?

(a)  

76.

Which of the following are found in the nucleus?

a)

Neutrons & Electrons

b)

Electrons & Protons

c)

Protons & Neutrons

d)

Just neutrons

77.

Which of the following statements is true about the charge of the sub-atomic particles:

a)

Protons are neutral; electrons are neutral

b)

Neutrons are neutral; electrons are positive

c)

Protons are neutral; electrons are negative

d)

Protons are positive; electrons are negative

78.

Which of the following statements is true about the mass of the sub-atomic particles:

a)

Protons have a mass of +1; electrons have a mass of -1

b)

Electrons have a mass of almost zero; neutrons have a mass of almost zero

c)

Neutrons have a mass of 1; protons have a mass of 1

d)

Neutrons have a mass of almost zero; electrons have a mass of 1

79.

The overall charge of an atom is...

a)

Positive

b)

Neutral

c)

Negative

80.

The overall charge of the nucleus is...

a)

Positive

b)

Neutral

c)

Negative

81.

An atom is neutral because

a)

The number of protons equals the number of neutrons

b)

The number of electrons equals the number of protons

c)

The number of electrons equals the protons plus neutrons

d)

The number of neutrons equals the number of protons plus electrons

82.
Most of the elements on the periodic table are classified as _____.
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Periods
83.
This class of elements are sometimes called "semiconductors."
a)
Metals
b)
Nonmetals
c)
Metalloids
d)
Groups
84.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
85.

______________ refers to the way a metal can be hammered or rolled into thin sheets.

a)

Luster

b)

Malleable

c)

Metalloids

d)

Solid

86.

There are _________ elements on the periodic table that are classified as metals.

a)

118

b)

nonmetals

c)

metals

d)

88

87.

Metals are found on the ______________ side of the periodic table.

a)

nonmetals

b)

left

c)

right

d)

metals

88.

This group of elements have properties that are opposite those of metals. ______________________

a)

luster

b)

nonmetals

c)

metalloids

d)

metals

89.

This group of elements sit along a stair step line on the periodic table and have properties of both metals and nonmetals. _________________________

a)

luster

b)

metals

c)

nonmetals

d)

metalloids

90.

Copper is a common metal. Which of the following properties does this metal most likely have?

a)

High conductivity, high malleability, and low luster

b)

Low conductivity, low malleability, and low luster

c)

High conductivity, high malleability, and high luster

d)

Low conductivity, high malleability, and high luster

91.
Which of the following is a good conductor of heat?
a)
Metal
b)
Nonmetal
c)
Metalloid
92.
How are elements on the periodic table arranged by?
a)
in alphabetic order
b)
simular physical & chemical properties
c)
their symbols
d)
Just simular physical properties
93.
Each column in the periodic table is called a _________ .
a)
period
b)
group
c)
cluster
d)
unit
94.
Two elements chemically bonded form
a)
element
b)
compound
c)
mixture
d)
solutions
95.
Periods on the periodic table are __________.
a)
Horizontal Rows
b)
Vertical Columns
96.
Groups on the periodic table are __________.
a)
Horizontal Rows
b)
Vertical Columns
97.

The Atomic number is known as the _______

a)

Number of electrons in an atom

b)

Number of Protons in an atom

c)

Number of neutrons in an atom

d)

Number of Protons and electrons in an atom

98.

What charge do protons have?

a)

Positive

b)

Negative

c)

Neutral

99.

What is Atomic Mass Number ?

a)

Number of Protons

b)

Number of Neutrons

c)

Number of Protons and Neutrons

d)

Number of Protons and Electrons

100.

The number of electrons in an atom is equal to the...

a)

Atomic number

b)

Protons

c)

Atomic Mass

d)

Neutrons

101.

The formula used to calculate the number of neutrons is:

a)

Mass Number - Atomic Number

b)

Protons + Electrons

c)

Atomic Number - Mass Number

d)

Protons x2

102.

How many periods are on the periodic table?

a)

5

b)

6

c)

7

d)

8

103.

Elements in the same group have : (2 correct answers)

a)

Similar chemical properties

b)

Similar names

c)

Same number of outer (valence) electrons)

d)

The same number of protons

104.
a)
Periods
b)
Groups
105.
a)
Periods
b)
Groups
106.
a)
Same group
b)
Same period
107.
How did Mendeleev arrange the elements?
a)
alphabetical 
b)
density
c)
melting point
d)
atomic mass
108.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
109.
A vertical column is called...
a)
group
b)
tower
c)
period
d)
crew
110.
The blue atoms are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
111.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
112.
Which is a halogen?
a)
Helium
b)
Chlorine
c)
Oxygen
d)
Neptune
113.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
114.

How many atoms of hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

115.

How man atoms of carbon are there?

a)

1

b)

2

c)

3

d)

4

116.

How many atoms of Iron are in this compound?

a)

1

b)

2

c)

3

d)

4

117.

How many atoms of hydrogen are in

C6H12O6

a)

6

b)

12

c)

18

d)

2

118.

How many atoms of oxygen are in

3Fe2O3

a)

6

b)

9

c)

18

d)

2

119.

Select the chemical formula for this molecule?

a)

B1F3

b)

BF

c)

BF3

d)

FB

120.

What is the chemical formula for this molecule?

a)

H1F2

b)

H1F1

c)

HF

d)

HeF

121.

What is the chemical formula for this molecule?

a)

H1O2

b)

H1O1

c)

HO

d)

H2O2

122.

What is the chemical formula for this molecule?

a)

C1I4

b)

C1I1

c)

CI4

d)

C2I2

123.

What is the chemical formula for this molecule?

a)

N2He4

b)

NeH3

c)

N2H4

d)

N2H2

124.

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

a)

Molecule

b)

compound

c)

polar covalent bond

d)

nonpolar covalent bond

125.

two or more atoms held together by covalent bonds

a)

Molecule

b)

compound

c)

polar covalent bond

d)

nonpolar covalent bond

126.

a covalent bond in which the electrons are shared equally by the two atoms

a)

Molecule

b)

compound

c)

polar covalent bond

d)

nonpolar covalent bond

127.

A covalent bond in which electrons are not shared equally causing slight charge.

a)

Molecule

b)

compound

c)

polar covalent bond

d)

nonpolar covalent bond

128.

How many atoms of oxygen are in this compound?

2Ca(OH)2

a)

1

b)

2

c)

3

d)

4

129.

What type of bond is this?

a)

James Bond

b)

Covalent Bond

c)

Ionic Bond

d)

Magnetic Bond

130.

What type of bond is this?

a)

James Bond

b)

Covalent Bond

c)

Ionic Bond

d)

Magnetic Bond

131.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

132.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

133.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

134.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

135.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

136.

How many Sodium atoms are in 6NaCl?

a)

1

b)

12

c)

6

137.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

138.

What determines the reactivity of an element?

a)

protons

b)

neutrons

c)

electrons

d)

valence electrons

139.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
140.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

141.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

142.

How many atoms/ions are in one formula unit of Zn(C2H3O2)2 ?

(a)  

143.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

144.

NaCl is the chemical formula for salt. Is NaCl considered a compound or an element?

a)

element

b)

compound

c)

both

d)

neither

145.

We breathe oxygen. Its chemical formula is O2. Is this formula an element or a compound?

a)

element

b)

compound

c)

neither

d)

both

146.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
147.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
148.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
149.
How many Valence Electrons does Argon have?
a)
2
b)
3
c)
8
d)
18
150.
Which equation obeys the law of conservation of mass?
a)
H2 + O2 ------>  H20
b)
C + 2H2 ---->  CH4
c)
2Fe2O3  ------> 2O2 + 4Fe
151.
What is the name of this element?
a)
Helium
b)
Hydrogen
c)
Argon
d)
Silver
152.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
153.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
154.
What is the atomic number of this atom?
a)
2
b)
4
c)
6
d)
none of the above
155.
What group does this element belong to?
a)
Group 1: Alkali metals
b)
Group 18: Noble Gases
c)
Group 2: Alkaline-Earth Metals
d)
Group 17: Halogens
156.
How many valence electrons?
a)
2
b)
3
c)
5
d)
10
157.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
158.

On the periodic table, Groups are

a)

Horizontal rows

b)

Vertical columns

159.

On the periodic table, Periods are

a)

Horizontal rows

b)

Vertical columns

160.

The innermost energy level has a maximum of how many electrons?

a)

1

b)

2

c)

6

d)

8

161.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

162.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

163.

What group does this element belong to?

a)

1

b)

2

c)

17

d)

18

164.

How many valence electrons?

a)

2

b)

4

c)

6

d)

8

165.

Which Bohr model represents Neon?

a)
b)
c)
d)
166.
Which is an electron?
a)
A
b)
B
c)
C
167.

How many electrons go in the first shell (ring) ?

a)

6

b)

8

c)

4

d)

2

168.

This is a Bohr Diagram of Aluminum. How many valence electrons does Aluminum have?

a)

3

b)

4

c)

5

169.

How many valence electrons does Tin (Sn) have?

a)

8

b)

7

c)

5

d)

4

170.

How many valence electrons does Lithium (Li) have?

a)

8

b)

1

c)

5

d)

2

171.

How many valence electrons does Bromine (Br) have?

a)

5

b)

6

c)

7

d)

8

172.
What is a valence electron?
a)
an electron that is found in the outermost shell of an atom. 
b)
an electron found in the innermost shell of an atom.
c)
an electron found in the middle shell.
173.

Which of these is incorrect?

a)
b)
174.

Which of these is correct?

a)
b)
c)
175.
This could be the dot diagram of 
a)
Ne
b)
Si
c)
Al
d)
Be
176.

Which element is this?

a)

Nickel

b)

Neon

c)

Sodium

d)

Nitrogen

177.

Name this element.

a)

Argon

b)

Chlorine

c)

Aluminum

d)

Boron

178.

Name this element.

a)

Neon

b)

Magnesium

c)

Sodium

d)

Manganese

179.

What is this element?

a)

Beryllium (atomic #4)

b)

Boron (atomic #5)

c)

Carbon (atomic #6)

d)

Nitrogen (atomic #7)

180.

How many valence electrons?

a)

2

b)

3

c)

4

d)

5

181.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
182.
What is the mass number defined as?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
183.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
184.

What is the mass number of this atom?

a)

1

b)

3

c)

4

d)

7

185.

Atoms of the same element which have a different number of neutrons are called _________________.

a)

ions

b)

isotopes

c)

quarks

d)

molecules

186.

How many neutrons does C-14 contain? (tap to enlarge the image)

a)

6

b)

7

c)

14

d)

8

187.

How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)

a)

12

b)

10

c)

22

d)

20

188.

How many electrons are in an neutral atom with an atomic number of 50?

a)

5

b)

8

c)

50

d)

2

189.
which atom has  4 neutrons?
a)
Li-6
b)
Li-7
c)
Li-8
d)
they have the same # of neutrons
190.

The average atomic mass of an element is the ___.

a)

average of the mass number and the atomic number for the element

b)

average of the masses of the isotopes of the element

c)

total mass of the isotopes of the element

d)

total number of subatomic particles in the nucleus

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