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Final science revision grade 8 2022

Total questions: 116

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

Matter is anything that occupy space and has mass. It can be classify into two(2), what are those classification?

a)

Homogeneous and Heterogeneous

b)

Elements and Compounds

c)

Pure substances and Mixtures

d)

Solute and Solvent

2.

Nitrogen (N), Oxygen (O), Carbon (C) and Hydrogen are the most common example of ?

a)

Molecules

b)

Elements

c)

Compounds

d)

Substances

3.

It is a form of matter which mean it has a one

type of atom or molecule.

a)

Substance

b)

Element

c)

Compound

d)

Mixtures

4.

It is a combination of two or more substances.

a)

Substances

b)

Mixtures

c)

Elements

d)

Compound

5.

It is a mixture with a non-uniform composition.

a)

Homogeneous mixture

b)

Solvation process

c)

Heterogeneous mixture

d)

Solubility

6.

In a solution this is the dissolving substance.

a)

Powder

b)

Solute

c)

Liquid

d)

Gas

7.

This is a mixture of two or more substances in which one or more of these substances (solutes) is dissolved in another substance.

a)

Compound

b)

Element

c)

Heterogeneous mixture

d)

Homogeneous mixture

8.

Why is water known as universal solvent?

a)

It is found anywhere.

b)

It gives life to living things.

c)

It covers the greater part of the earth.

d)

It dissolves almost all the substances on Earth.

9.

Is water a element or compound?

a)

Element

b)

Compound

10.

A compound consists of two or more elements chemically combined.

a)

True

b)

False

11.

It is a combination of two or more substances in

which the composition is uniform throughout the

mixture.

a)

Heterogeneous mixture

b)

Homogeneous mixture

c)

Solvation

d)

Solution

12.

A process by which solvent molecules surround

and interact with solute molecules

a)

Salvation

b)

Solvation

c)

Solution

d)

Solubility

13.

What are two types of solutions?

a)

Saturated and Unsaturated

b)

Solubility and Solvation

c)

Solute and Solvent

d)

Unsaturated and Saturated

14.

The process of separating components

of a liquid through selective evaporation or

condensation

a)

Distillation

b)

Evaporation

c)

Filtration

d)

Chromatography

15.

A process of separating

components of a mixture.

a)

Distillation

b)

Evaporation

c)

Filtration

d)

Chromatography

16.
Is hydrogen considered a metal or a non-metal?
a)
A metal
b)
Nonmetal
c)
Metalloid
17.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
18.
Same repel, opposites
a)
avoid
b)
attract
c)
push
d)
pull
19.
Is this ionic bond drawn correctly?
a)
Yes
b)
No
20.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
21.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
22.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
23.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
24.
Two or more atoms held together by a chemical bond is called what?
a)
A molecule
b)
A molecure
25.
An electron has what kind of charge?
a)
no charge
b)
positive 
c)
negative
d)
it depends
26.
Atoms that gain electrons become...
a)
negatively charged
b)
positively charged
c)
remain neutrally charged
d)
21
27.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
28.
Which of the following is NOT formed by a covalent bond?
a)
K2S
b)
H2O
c)
I2
d)
CO2
29.
Covalent bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
30.
Is hydrogen considered a metal or a non-metal?
a)
A metal
b)
Nonmetal
c)
Metalloid
31.
What is a valence electron?
a)
The sum of neutrons and protons.
b)
The # of electrons in the last shell.
c)
A type of bond.
d)
A popular compound.
32.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
33.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
34.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
35.
What molecule could this be? 
a)
H2O
b)
CCl4
c)
PCl5
d)
NaCl
36.
What molecule could this be? 
a)
BF3
b)
CH4
c)
H2O
d)
CO2
37.
Who could this molecule be?
a)
CH4
b)
CO2
c)
PCl5
d)
BF3
38.
What type of bond is shown in this image?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals Force
39.
What type of bond is shown in this picture?  It is the WEAKEST type & attracts one water compound to another!
a)
Ionic bond
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals force
40.
Which of the following is NOT considered a diatomic element?
a)
Carbon
b)
Nitrogen
c)
Chlorine
d)
Iodine
41.
Diatomic elements are defined as IDENTICAL elements that bond with each other (i.e. Oxygen with Oxygen).  What type of bond should they form?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals force
42.
Diatomic elements are defined as IDENTICAL elements that bond with each other (i.e. Oxygen with Oxygen).  What do we call it when this forms?
a)
Compound
b)
Molecule
c)
Atom
d)
None of the above
43.

Why do all bonds form?

a)

to fill the outermost energy level

b)

so an atom can be unstable

c)

so the number of protons and electrons can equal.

d)

so they can gain neutrons.

44.

Valence electrons are found

a)

outermost energy level

b)

innermost energy level

c)

some where in the electron cloud

45.

An atom with 1 valence electron 'needs' a full shell, so it can either gain 7 electrons or lose 1. Which is more likely to occur?

a)

nothing

b)

gain 7

c)

lose 1

46.

How do covalent bonds form?

a)

by sharing electrons between atoms

b)

by donating or receiving electrons

47.

What two types of atoms make a covalent bond?

a)

2 nonmetals

b)

2 metals

c)

1 metal and 1 nonmetal`

48.

Ionic bonds are between

a)

metals and nonmetals

b)

2 metals

c)

2 nonmetals

49.

How are ionic bonds formed?

a)

transfer of electrons

b)

sharing of electrons

50.

A combination of two or more substances that can be separated is a

a)

potion

b)

mixture

c)

solute

d)

compound

51.

A solution is made when one substance _________ in another.

a)

settles at the bottom

b)

moves

c)

dissolves

d)

is suspended

52.

A ____________ solution contains the maximum amount of solute.

a)

diluted

b)

mixed

c)

concentrated

d)

saturated

53.

A ________ solution has a low amount of solute

a)

saturated

b)

concentrated

c)

diluted

d)

mixed

54.

In a saltwater solution, the salt is the __________.

a)

solvent

b)

molecule

c)

part

d)

solute

55.

In a saltwater solution, the water is the _________

a)

solvent

b)

mixture

c)

combination

d)

solute

56.

The amount a solute can dissolve in a liquid is its ___________

a)

ability

b)

mixing

c)

solubility

d)

dilution

57.

Mixtures CANNOT be separated.

a)

True

b)

False

58.

A heterogeneous mixture can separate on its own and often needs to be shaken to be recombined.

a)

True

b)

False

59.

Lowering the temperature of a liquid can increase its solubilty

a)

True

b)

False

60.

Some solutions need to be separated by distillation

a)

True

b)

False

61.

Cereal is a homogenous mixture

a)

True

b)

False

62.

Milk is a homogenous mixture.

a)

True

b)

False

63.

Italian salad dressing is a heterogenous mixture.

a)

True

b)

False

64.

Ketchup is a homogenous mixture.

a)

True

b)

False

65.

A filter can be used to separate a mixture.

a)

True

b)

False

66.

What are TWO tools you can use to separate a mixture?

a)

magnet

b)

scale

c)

saw

d)

heat

e)

weights

67.

When a mixture is created it creates a __________ change.

a)

emotional

b)

chemical

c)

good

d)

physical

68.

When a chemical change happens you know because ____________.

CHOOSE 2 Answers

a)

it foams and bubbles

b)

it looks the same

c)

it gives off heat

d)

it doesn't give off smoke.

69.

You know a creating a mixture is NOT a chemical change because _____________.

a)

it cannot be separated.

b)

it will bubble and give off heat

c)

it smokes when mixed.

d)

it can be separated by hand or with tools

70.

What is a mixture?

a)

A chemical combination of two or more different substances

b)

A physical combination of two or more different substances

c)

A chemically pure substance

71.

Which of the following is NOT an example of a mixture?

a)

Air

b)

Blood

c)

Gasoline

d)

Pure Water

(fresh water)

72.

What type of mixture is uniform in composition?

a)

A chemical mixture

b)

A homogeneous mixture

c)

a heterogenous mixture

d)

A compound

73.

What is a solution?

a)

A type of homogenous mixture

b)

A type of heterogeneous mixture

c)

A type of suspension

74.

The substance that “does the dissolving” in a solution is called:

a)

the solvent

b)

the solute

c)

the salt

d)

the suspension

75.

Solubility is a measure of:

a)

The concentration of a homogeneous mixture

b)

The concentration of a heterogenous mixture

c)

How easily a substance dissolves into another substance

76.

What substance is often called the "Universal solvent"?

a)

Water

b)

Ethanol

c)

Salt

d)

Blood

77.

An Alloy is:

a)

a heterogenous mixture of a metal and non-metal

b)

a heterogenous mixture of two or more metals

c)

a homogenous mixture of tow or more nonmetals

d)

A homogenous mixture of two metals or a metal and nonmetals

78.

What type of mixture can you separate back into its original components?

a)

A solution

b)

A heterogenous mixture

c)

A Suspension

d)

All answers are correct

79.

Which separation technique involves the physical separation of a mixture of solid particles, usually by size

a)

Mechanical Separation

b)

Magnetism

c)

Filtration

80.

Which Separation Technique is best for removing dust in the air or impurities in water?

a)

Mechanical Separation

b)

Magnetism

c)

Filtration

81.

How was this test for you?

a)

So easy! I nailed it!

b)

Pretty good.

c)

It was kind of hard.

d)

I had no idea about anything!

82.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

83.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

84.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

85.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

86.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

87.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
88.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

89.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
90.

In the equation 2Mg+O2 → 2MgO2Mg+O_2\ \rightarrow\ 2MgO   which are the reactants?

a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
91.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
92.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
93.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
94.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
95.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
96.

 A substance that cannot be broken down into any other substance by ordinary chemical means is called

a)
molecule
b)
mixture
c)
element
d)
compound
97.

NaHCO3 is an example of

a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
98.
What is an example of an element?
a)
Oxygen
b)
Pure water
c)
Air
d)
Table salt
99.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and 2 H2O

d)

O2 and H2O

100.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
101.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
102.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
103.
How many TOTAL atoms are on the REACTANT side of this equation?
CH4 + 2O2 → CO2 + 2H2O 
a)
5
b)
7
c)
9
d)
11
104.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

105.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

106.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

107.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

108.

What is the general reaction scheme for a single replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

109.

What is the general reaction scheme for a combustion  reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

110.

What is the general reaction scheme for a combination reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

111.

What is the general reaction scheme for a double replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

112.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

113.

What type of reaction is the following:
2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

114.

What type of reaction is the following:
C11H24+17O2−> 11CO2 + 12H2OC_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

115.

What type of reaction is the following:
2NaHCO3−> Na2CO3+CO2+H2O2NaHCO_3->\ Na_2CO_3+CO_2+H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

116.

What type of reaction is the following:
Zn + 2HCl −> ZnCl2+H2Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

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