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Year 8 Chemistry Revision

Total questions: 49

Worksheet time: 39mins

Name
Class
Date
1.

Sn

a)

tin

b)

sulfur

c)

iron

d)

sodium

2.

Sulfur

a)

Sf

b)

Su

c)

Sr

d)

S

3.

Gold

a)

Go

b)

Gl

c)

AU

d)

Au

4.
A charged particle that has gained or lost electrons is called a _____.
a)
molecule
b)
ion
c)
isotope
d)
element
5.
A cation is a ____ ion.
a)
negative
b)
positive
c)
neutral
d)
ficticious
6.

Nitrogen, N, will form which of the following ions?

a)

N

b)

N-3

c)

N-5

d)

N+5

7.

Beryllium, Be, will ____ valence electrons when forming an ionic bond.

a)

lose 4

b)

gain 4

c)

lose 2

d)

gain 2

8.
Ionic bonds form between metals and ____.
a)
metalloids
b)
metals
c)
nonmetals
9.

Ionic bonds happen because of the ____ of valence electrons.

a)

sharing

b)

transfer

c)

keeping

d)

covering

10.
Write the correct chemical formula for Ag +  and  Br -
a)
AgBr
b)
silver bromide
c)
Ag2Br2
d)
gold bromide
11.
Write the formula for barium + nitrogen
a)
Ba2N3
b)
Ba3N2
c)
BaN
d)
BaN3
12.

Which element below would have a 3+ charge as an ion?

a)

nitrogen (N)

b)

boron (B)

c)

silicon (Si)

d)

argon (Ar)

13.
How many valence electrons does nitrogen have?
a)
3
b)
2
c)
5
d)
1
14.
What can be generalized about covalent bonds?
a)
Electrons will be exchanged.
b)
Electrons will be transferred.
c)
Electrons will be given and taken.
d)
Electrons will be shared.
15.

Which of the following is the best representation of a molecule of fluorine (F2)?

a)

A

b)

B

c)

C

d)

D

16.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal & 1 Metal
c)
2 Metals
d)
2 Noble Gases
17.
What is a diatomic element?
a)
a metal bonded with a nonmetal
b)
2 or more nonmetals bonded together
c)
2 or more metals bonded together
d)
2 atoms of the same element bonded together
18.

Which formula is for phosphorus trichloride?

a)

KCl3

b)

PCl3

c)

K3Cl

d)

P3Cl

19.
The chemical formula of sulfur hexabromide is
a)
SBr₆
b)
S₆Br
c)
S(VI)Br
d)
S6Br
20.
What is the correct name for NO?
a)
Mononitrogen Monoxide
b)
Nitrogen Monoxide
c)
Mononitrogen Dioxide
d)
Nitrogen Oxide
21.
Which of the following is NOT an ionic compound:
a)
CaO
b)
NaOH
c)
BaCl2
d)
Br2
22.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
23.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
24.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
25.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
26.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
27.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
28.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

29.

What are the reactants in this word equation?

a)

Carbon dioxide and oxygen

b)

Carbon dioxide and water

c)

Oxygen and glucose

d)

Oxygen and water

30.

Magneisum reacts with oxygen to form magnesium oxide. The correct word equation is...

a)

A

b)

B

c)

C

d)

D

31.

What is the number of protons that the element in this image contain?

a)

14

b)

7

c)

15

d)

18

32.

True or False? Neutrons have a negative charge

a)

True

b)

False

33.
If I gain electrons I become
a)
Positive because I've added to my atom
b)
negative because I've added electrons
c)
same because i'm balanced
d)
equal because now I have electrons
34.

The proper formula for magnesium hydroxide:

a)

MgOH

b)

Mg2OH

c)

Mg(OH)2

d)

Mg2OH2

35.

How do the following two elements bond together?

Al3+ O2-

a)

AlO

b)

Al2O3

c)

Al3O6

d)

Al3O2

36.
An isotope of an element has the same number of _________, but a different number of _________.
a)
Protons, electrons
b)
Protons, neutrons
c)
Electrons, neutrons
37.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
38.

mass number

a)

number of protons

b)

number of electrons

c)

number of protons and electrons

d)

number of protons and neutrons

39.
A mixture can be separated by ________ means. 
a)
physical
b)
chemical
40.
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
41.
Elements in a compound can be separated __________
a)
physically
b)
chemically
42.
A row across the Periodic Table where each element has the same number of energy shells
a)
column
b)
family
c)
period
43.
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
44.

The order of elements in the periodic table is based on

a)

the number of protons in the nucleus.

b)

the electric charge of the nucleus.

c)

the number of neutrons in the nucleus.

d)

atomic mass.

45.

Which of the following elements is an alkali metal?

a)

calcium

b)

magnesium

c)

mercury

d)

sodium

46.

The three main groups of elements are metals, nonmetals, and

a)

inert gases.

b)

alkali metals.

c)

radioactive isotopes.

d)

semiconductors/metalloids.

47.

Metals tend to be

a)

gases.

b)

dull.

c)

brittle.

d)

good conductors.

48.

Which of the following groups on the Periodic Table is likely to form positively charged ions (or cations)?

a)

group 1

b)

group 13

c)

group 17

d)

group 18

49.

Where are most nonmetals located on the periodic table?

a)

in the bottom row

b)

on the left side and in the middle

c)

on the right side

d)

in the top row

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