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Revision - year 8 - compounds and mixtures

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.
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
2.
1 A substance made up of two or more chemically combinedelements is —
a)
an element
b)
mixture
c)
compound
d)
solution
3.
 A substance that cannot be broken down into any other substance by ordinarychemical means is called —
a)
molecule
b)
mixture
c)
element
d)
compound
4.
NaHCO3 is an example of —
a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
5.
A substance made of only one type of atom is called —
a)
an element
b)
a mixture
c)
a compound
d)
a salt
6.
Which of the following is a way in which elements and compounds are similar?
a)
Elements and compounds are pure substances.
b)
Elements and compounds are both made up of different kinds of atoms.
c)
Elements and compounds can both be broken down by physical means.
d)
Elements and compounds are listed on the periodic table.
7.
What is an example of an element?
a)
Oxygen
b)
Pure water
c)
Air
d)
Table salt
8.
Two or more substances in the same place but NOT chemically combined or in a specific ratio is called —
a)
a compound 
b)
a pure substance
c)
an element
d)
a mixture
9.
Which of the following atomic symbols is written correctly?
a)
ee
b)
hE
c)
C
d)
CL
10.
Which of the following chemical formulas represents a compound? 
a)
C3
b)
O2
c)
CH3CHO
d)
H2
11.
Which statement best describes an element?
a)
made from mixture 
b)
thousands in the world
c)
pure, made of only one atom
d)
can be separated 
12.
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.
13.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
14.
What is the tiniest particle in the entire universe?
a)
cells
b)
gases
c)
atoms
d)
liquids
15.
Are these molecules also compounds?
a)
YES
b)
NO
16.
Are these molecules also compounds?
a)
YES
b)
NO
17.
All ____________ are made up of two or more atoms bonded together.
a)
atoms
b)
molecules
c)
electrons
d)
elements
18.
All ____________ are made up of two or more atoms bonded together.
a)
atoms
b)
molecules
c)
electrons
d)
elements
19.
When a CHEMICAL reaction occurs, what is made?
a)
No new substance is made.
b)
A new substance is made with new atoms formed
c)
A new substance is made, with existing atoms rearranged
d)
All substances remain the same, but physical state may change.
20.
The formula for glucose is C6H12O6. How many elements does glucose contain?
a)
1
b)
3
c)
24
d)
432
21.

Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is CH3COOH.

How many different elements are in acetic acid?

a)
3
b)
5
c)
6
d)
8
22.
A student mixes two solutions, planning to produce carbon dioxide. Which of the following is the BEST evidence that a chemical reaction is producing carbon dioxide?
a)
color change
b)
formation of a solid
c)
temperature change
d)
formation of bubbles
23.

The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.

What type of change is occurring when the paper is heated?

a)

chemical change

b)
elemental change
c)
physical change
d)
temperature change
24.
Which of the following is the BEST evidence that rusting is a chemical property rather than a physical property of iron?
a)
Rust forms slowly.
b)
Rust can form on any iron.
c)
Rust cannot turn back into iron.
d)
Rust does not look the same as iron.
25.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H2O
26.

2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2

Identify the products in the chemical equation above.

a)
2AgNO3 and CaCl2
b)
2AgCl and Ca(NO3)2
c)
CaCl2 and Ca
d)
Ag, Cl, N, and Ca
27.
NaOH + HCl --> NaCl + H2O Identify the reactants in the chemical equation above.
a)
NaOH and HCl
b)
NaCl and H2O
c)
HCl and H2O
d)
HCl and NaCl
28.

Which observation is NOT a sign of a chemical reaction?

a)

fizzing

b)

temperature change

c)

dissolving

d)

colour change

29.

Which is a chemical reaction

a)

A banana ripped

b)

ice melting

c)

pencil breaking

d)

paper burning

30.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
31.
Is wood burning a physical or chemical change?
a)
Physical 
b)
Chemical
32.
A ___________ is an arrangement of elements in columns
a)
columns
b)
rows
c)
periodic table
d)
electron shell
33.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
34.
GOLD
a)
Al
b)
Ag
c)
Ar
d)
Au
35.
An example of matter made of only one element is
a)
water
b)
gold bar
c)
light bulb
d)
salad mixture
36.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
37.

Which symbol shows a chemical reaction has occured?

a)

A

b)

B

c)

C

d)

D

38.

In a word equation the REACTANTS

a)

Are written on the right hand side of the arrow

b)

Are produced in a chemical reaction

c)

Are always the same

d)

Are the substances that react together

39.

The new substances formed in a chemical reaction are called

a)

Reactants

b)

Atoms

c)

Products

d)

Reagents

40.

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

41.

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

a)

A

b)

B

c)

C

d)

D

42.

Magnesium + ________ --> magnesium oxide


What is missing?

a)

Hydrogen

b)

Sulphur

c)

Oxygen

d)

Oxide

43.

Potassium iodide + lead nitrate --> _____________ + lead iodide


What is missing?

a)

lead nitrate

b)

potassium nitrate

c)

nitrogen

d)

potassium iodide

44.

Sodium + chlorine

a)

sodium chloride

b)

sodium hydroxide

c)

sodium oxide

d)

sodium

45.

Instant coffee is made by dissolving a powder in hot water. Instant coffee is a ___________________ .

a)

pure substance

b)

mixture

46.

Dry ice is solid carbon dioxide, or CO2. Dry ice may be used as a cooling agent and contains two oxygen atoms bonded to a carbon atom. Dry ice is a ___________________ .

a)

pure substance

b)

mixture

47.

Cake batter is a substance that may contain flour, eggs and sugars mixed by hand or with an electric mixer. Cake batter is a ___________________ .

a)

pure substance

b)

mixture

48.

Blood is a fluid found in the bodies of humans and other animals. It can be physically separated into plasma, red blood cells and white blood cells. Blood is a ___________________

a)

pure substance

b)

mixture

49.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
50.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
51.
What is boiling point 
a)
The temperature at which a substance changes from a liquid to a gas 
b)
unique trait or feature of something 
c)
not able to dissolve 
d)
the amount of matter something has 
52.

When a pure substance changes state, its temperature:

a)

Increases

b)

Decreases

c)

Stays the same

d)

Goes up and down rapidly

53.

When a mixture (impure substance) changes state, its temperature:

a)

Increases

b)

Decreases

c)

Stays the same

d)

Changes

54.

Does the graph represent the melting / boiling point of a pure or impure substance?

a)

Pure

b)

Impure

c)

Unable to tell

55.

Does the graph represent the melting / boiling point of a pure / impure substance?

a)

Pure

b)

Impure

c)

Unable to tell

56.
How much is the percentage of Nitrogen in air? 
a)
0.03 %
b)
78 % 
c)
21 %
d)
trace
57.
How much is the percentage of CO2 in air ? 
a)
21
b)
0.03
58.
Does air contains water vapour ?
a)
Yes 
b)
No
59.
Is air a mixture or compound ?
a)
mixture 
b)
compound
60.
what is the suitable method to separate air components ? 
a)
chromatography 
b)
Fractional distillation 
c)
using magnet 

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