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Question Bank for Grade 8 Chemistry

Total questions: 83

Worksheet time: 57mins

Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
3.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
4.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
5.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
6.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
7.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

8.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

9.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

10.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

11.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

12.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

13.

How many different elements are present in this molecule?

3 NH4C2H3O2

a)

15

b)

36

c)

5

d)

4

14.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

15.

The smallest piece of an element:

a)

quark

b)

electron

c)

shell

d)

atom

16.

The cloud-like space that electrons travel around:

a)

nucleus

b)

shell

c)

neutrons

d)

Oort cloud

17.

Protons and neutrons are found in the center of the atom called the:

a)

nucleus

b)

neutron

c)

shell

d)

cell

18.

The subatomic particles are called:

a)

protons, nucleus and electrons

b)

protons, electrons and neutrons

c)

protons, positives and negatives

d)

cloud, shell and quarks

19.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

20.

What is the sum of an atom's protons and neutrons called?

a)

atom

b)

atomic theory

c)

atomic mass

d)

atomic number

21.

The _____ is based on the number of protons in the nucleus of the atom.

a)

atomic structure

b)

periodic table of the elements

c)

atomic number

d)

atomic mass

22.

What subatomic particle is represented by this symbol (+):

a)

neutron

b)

proton

c)

electron

23.

What subatomic particle is represented by this charge (-):

a)

neutron

b)

proton

c)

electron

24.

The chemical formula is C4H10. How many hydrogen atoms are in one molecule of this?

a)

1

b)

4

c)

10

25.

There are three carbon atoms in one formula unit of K2CO3.

a)

true

b)

false

26.

Mg(NO3)2 has five oxygen atoms per formula unit.

a)

true

b)

false

27.

How many molecules are represented by 2C6H12O6 ?

(a)  

28.

How many atoms are in one molecule of C12H22O11 ?

(a)  

29.

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

(a)  

30.

How many carbon atoms are in 3 CH3CH3CH2CH2CH2CH3 ?

(a)  

31.
Explain the difference between an atom and a molecule.
a)
One molecule is made of one atom.
b)
One molecule is always made of different particles.
c)
One molecule is made of more than one atom.
d)
One molecule is made of more than two atoms.
32.
A molecule is made up of ____ or more atoms.
a)
1
b)
2
c)
3
d)
4
33.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
34.

The vertical (up and down) columns in the Periodic Table are called

a)

groups

b)

towers

c)

periods

d)

atomic numbers

35.
The Modern Periodic Table of Elements is arranged by
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
36.
Which group of the periodic table is composed of inert (not reactive)  gases?
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
37.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
38.
Which is a halogen?
a)
Helium
b)
Chlorine
c)
Oxygen
d)
Neptune
39.
Elements in a ..................have similar chemical properties.  
a)
period
b)
group
c)
row
40.

The letter, C, is a ... of carbon.

a)

Name

b)

Nickname

c)

Chemical Symbol

d)

Pseudonym

41.

Which of the following are physical properties of metal?

a)

Luster

b)

Conductivity

c)

Malleability

d)

Ductility

42.

True or False: The reactivity of metals tends to decrease as you move from left to right across the periodic table.

a)

True

b)

False

43.

Name this group: These metals are the most reactive.

a)
b)
c)
d)
44.

Name this group: These metals are the second most reactive.

a)
b)
c)
d)
45.

Name this group: These metals are the second most reactive.

a)
b)
c)
d)
46.

Name this group: These metals contain familiar metals such as gold, iron, and copper.

a)
b)
c)
d)
47.

Name this group: These metals, located near the nonmetals, are never found uncombined in nature.

a)
b)
c)
d)
48.

Find these groups: Locate Lanthanides and Actinides.

a)
b)
c)
d)
49.

Which of the following could be properties of nonmetals?

a)

Poor electrical conductivity

b)

Poor thermal conductivity

c)

Dullness

d)

Brittleness

50.

I am a metal


I am in group 2


I am in period 6


I am…

a)

Mo

b)

Re

c)

S

d)

Ba

51.

I am a nonmetal


I am in period 2


I am in group 16/6A

a)

Ba

b)

Si

c)

Ba

d)

O

52.

Find an element with similar chemical properties to Barium (Ba).

a)

Ca an Ra, because they are in the same group and have similar chemical properties.

b)

Cs and La, b/c they are in the same period number.

c)

Ca and Y, b/c they are 90 degree angle and have similiar properties.

53.
A ___________ is an arrangement of elements in columns
a)
columns
b)
rows
c)
periodic table
d)
electron shell
54.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
55.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
56.
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.
57.
Which group of the periodic table is composed of inert (not reactive)  gases?
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
58.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
59.
Which element is not a metal?
a)
H
b)
Re
c)
Al
d)
B
60.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
61.
Which is a noble gas?
a)
Helium
b)
Chlorine
c)
Oxygen
d)
Neptune
62.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
63.
Which is a Alkai Metal
a)
Sodium
b)
Boron
c)
Chlorine
d)
Carbon
64.
Which group is between Metals and Non Metals?
a)
Transition Metals
b)
Metalloids
c)
Alkali Earth Metals
d)
Hydrogen
65.
Which group of the periodic table is shinny, ductile, malleable and takes up 75% of the periodic table?
a)
Metals
b)
Non Metals
Non Metals
c)
Metalloids
d)
Noble Gases
66.
Which two groups/families/columns are the most reactive and want to give up their valence electrons? 
a)
Groups 1 and 2
b)
Groups 1 and 3
c)
Groups 16 and 17 
d)
Groups 4 and 5
67.
How many valence electrons does Group 1 Alkali Metals have?
a)
6
b)
2
c)
1
d)
4
68.
A compound consist of ____ or _____ different elements or molecules chemically combined.
a)
 1  or more
b)
2 or more
c)
4 or more 
d)
I don't know
69.
Which subatomic particle is inside the nucleus of an atom and has a positive charge?
a)
Proton
b)
Electron
c)
Neutrophil
70.
Which subatomic particle is inside the nucleus of an atom and has a positive charge?
a)
Proton
b)
Electron
c)
Neutrophil
71.
Which subatomic particle is inside the nucleus of an atom and has no charge?
a)
Proton
b)
Electron
c)
Neutron
d)
Neutrophil
72.
Which subatomic particle travels outside of the nucleus of an atom and has a negative charge?
a)
Proton
b)
Neutron
c)
Electron
d)
Neutrophil
73.
Does an atom take up space and have mass?
a)
Yes
b)
No
74.
How many kinds of atoms are elements composed of?
a)
1
b)
2
c)
Hundreds
d)
Trillions
75.
When two or more atoms are combined chemically, they make what?
a)
Mixture
b)
Compound
c)
Solution
d)
Vapor
76.
When two or more different substances are physically combined, they form what?
a)
Compound
b)
Mixture
c)
Solution
d)
Vapor
77.
In a heterogeneous mixtures, particles are easily seen.
a)
True
b)
False
78.
What type of mixture is it difficult to separate and to view the individual substances?
a)
Heterogeneous
b)
Homogeneous
c)
Heterozygous
d)
Homozygous
79.
What are the three states of matter?
a)
Vapor, Liquid, Steam
b)
Liquid, Ice, Solid
c)
Solid, Liquid, Gas
80.
In a solid, the molecules?
a)
Move freely
b)
Do not move
c)
Move slightly
81.
In a liquid, the molecules?
a)
Do not move
b)
Will fill the shape of a container
82.
In a gas, the molecules?
a)
Do not move
b)
Move easily
83.
What are atoms?
a)
The basic building blocks of all matter
b)
One of the phases of matter
c)
They travel in energy
d)
They are radiated from the sun

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