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Review Semester 2 Test Grade 7 Chemistry

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.
3. Identify the states of matter where Brownian Motion can occur.
a)
a) Solid, liquid, gas
b)
b) Liquid, gas
c)
c) Solid, gas
d)
d) Solid, liquid
2.

A pollen grain in a beaker of still water is viewed through a microscope. Which diagram shows the most likely movement of the pollen grain?

a)

A

b)

B

c)

C

d)

D

3.

A student makes an observation using a microscope. He observed some particles which were moving in a zig-zag way. What particles could these NOT be?

a)

Smoke particles in air

b)

Dust particles in a room

c)

Pollen grains in water

d)

Molecules in a solid bar of steel

4.

Which of these is under greater pressure?

a)
b)
5.

Why do weather balloons increase in size as they climb the atmosphere?

a)

Because the gas pressure inside the balloon is higher than outside. This pushes its walls towards the outside.

b)

Because the gas pressure inside the balloon is lower than outside. This pushes its walls towards the outside.

c)

Because the gas pressure inside the balloon is lower than outside. This pushes its walls towards the inside.

d)

Because the lower temperature at high altitudes causes the balloon's latex body to expand

6.

The temperature of gas is held constant, while its volume is decreased. The pressure exerted by the gas on the wall of the container increases, because its molecules

a)

Strike the walls with higher velocities

b)

Strike the walls with more force

c)

Strike the walls more frequently

d)

Are in contact with the walls for a shorter time

7.

Which key term describes the movement of particles from a high to low concentration?

a)
a) Diffusion
b)
b) Osmosis
c)
c) Brownian Motion
d)
d) Absolute zero �
8.

How does the rate of diffusion change with an increase in temperature?

a)
a) Faster
b)
b) Slower
c)
c) Unaffected
d)
d) Impossible to tell
9.

What TWO factors will increase the pressure produced? A - Higher temperature B - Lower Temperature C - Higher volume D - Lower volume

a)
AC
b)
AD
c)
BC
d)
BD
10.
If a balloon is cooled what will happen to the volume?
a)
Volume will increase
b)
Volume will decrease
c)
Volume will not change
11.

Hydrogen bromide gas, HBr, reacts with ammonia gas, NH3, to form solid ammonium chloride. Molecules of HBr is heavier than NH3. The apparatus is set up as shown. After a few minutes, solid ammonium chloride forms where the two gases meet.

a)

A

b)

B

c)

C

d)

D

12.

Which element is INCORRECTLY matched with its symbol?

a)

Cu / copper

b)

Pb / lead

c)

K / potassium

d)

B / bismuth

13.

The vertical columns of the periodic table are called...

a)

Periods

b)

Families

c)

Chemical Symbols

d)

Groups

14.

Name this group: These elements, also known as inert gases, tend to be nonreactive.

a)

Alkali metals

b)

Alkaline Earth metal

c)

Noble gases

d)

Halogen gases

15.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
16.

What does this illustrate

a)

Elements

b)

Compunds

c)

Mixture of Elements and Compunds

d)

Mixture of Compounds

17.

Which of the following is matched incorrectly.

a)

Air: compound

b)

Steel alloy: homogeneous mixture

c)

Glucose (C6H12O6): compound

d)

Cookies & Cream: heterogenous mixture

18.

There are _____ elements in C6H12O6 (Sugar) ?

a)

24

b)

20

c)

3

d)

6

19.

The property of metal by which it can be drawn into wires is...

a)

sonority

b)

ductility

c)

malleability

d)

conductivity

20.

All of the following would classify an element as a metal except?

a)

Dull

b)

Luster

c)

Malleable

d)

Ductile

21.

When an object changes shape when struck by a hammer.

a)

luster

b)

malleable

c)

brittleness

d)

ductile

22.
Are made from a combination of 2 or more elements in a constant ratio...
a)
Atome
b)
Mixture
c)
Compounds
d)
Elements
23.
A combination that can be separated by physical processes is a .....
a)
Atom
b)
Compound
c)
Element
d)
Mixture
24.
What is a homogeneous mixture?
a)
a mixture that is the same throughout.
b)
a mixture that is made up of one type of atom.
c)
a mixture that is made up of one type of compound
d)
a mixture that cannot be separated through physical changes
25.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
26.
Name the following ionic compound: MgSO4
a)

magnesium sulfuride

b)
magnesium sulfide
c)
magnesium sulfate
d)

magnesium sulfur oxide

27.
CaCO3 is represented best by which name?
a)

calcium sulfate

b)

calcium nitrate

c)
calcium carbon trioxide
d)
calcium carbonate
28.

What is the name of the compound Mg3N2?

a)

manganese nitride

b)

magnesium nitride

c)

magnesium nitrogen

d)

magnesium nitrate

29.

The correct formula for "Dinitrogen pentoxide" is...

a)

N2O5

b)

N2O

c)

NO5

d)

NO

30.

Molecules below which has 5 atoms is...

a)

NH4NO3

b)

Mg(OH)2

c)

KI

d)

AlPO4

31.
P2O5
a)
dipotassium heptoxide
b)
potassium pentoxide
c)
diphosphorous pentoxide
d)
phosphorous oxide
32.

used to separate magnetic materials from nonmagnetic materials.

a)

MAGNETIC SEPARATION

b)

MANUAL PICKING

c)

DECANTATION

d)

SIEVING

e)

FILTERING

33.

separates soluble solids in a solution by evaporating the liquid component leaving the solid component behind

a)

EVAPORATION

b)

DISTILLATION

c)

FRACTIONAL DISTILLATION

d)

SIEVING

e)

FILTERING

34.

What seperation process is this?

a)

Evaporation

b)

Distillation

c)

Filtration

d)

Condensation

35.

How many components is this dye made of?

a)

2

b)

3

c)

4

d)

5

36.

Which process would you use to separate solid particles from larger particles in a mixture with filter paper in a funnel to trap solids so that the liquids will pass through.

a)

Chromatography

b)

Magnetic Attraction

c)

Filtration

d)

Flotation

37.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
38.

A substance is soluble if it can be dissolved.


In paper chromatography, the most soluble solute _____________________ .

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

39.
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
a)
P only
b)
S only
c)
P and S
d)
P and X
40.

Which substance is least soluble at 0 ºC?

a)

KI

b)

KNO3

c)

KClO3

d)

Ce2(SO4)3

41.

Which solute is most likely a gas?

a)

NH3

b)

NaNO3

c)

KCl

d)

NaCl

42.

Identify how many grams of KNO3 is required to make a saturated solution at 40'C.

a)

50 g

b)

45 g

c)

55 g

d)

33 g

43.
If I dissolve sugar in water, what is the solute?
a)
Water
b)
Hydrogen
c)
Sugar
d)
Carbon
44.
What will allow more solute to be dissolved in a solvent.
a)
adding more solute
b)
stiring
c)
cooling solution
d)
heat
45.

What combination would dissolve a solid solute the fastest?

a)

high temperature, no stirring

b)

no heat, no stirring

c)

sugar cube, no heat

d)

high temperature, stirring

46.

Which of the properties of alkaline substance is NOT TRUE?

a)

taste bitter

b)

slippery

c)

turn red litmus paper to blue

d)

turn blue litmus paper to red

47.

The reaction between acid and alkali known as

a)

Titration

b)

Neutralisation

c)

Halogenation

d)

Addition

48.

When hydrochloric acid titrated into sodium hydroxide and achieved end point of neutralisation.

Which of the followings will be the mixture inside conical flask

a)

Sodium nitrate and water

b)

Sodium sulphate and water

c)

Sodium chloride and water

49.

Toothpaste will help to reduce acidity on tooth surface produced by bacteria.

This means toothpaste is

a)

Alkaline

b)

Acidic

c)

Amphoteric

d)

Neutral

50.

Potassium hydroxide + Y -> potassium sulphate + water


What Y will be?

a)

Nitric acid

b)

Hydrochloric acid

c)

Sulphuric acid

51.

Which of the following is neutral?

a)

Water

b)

Acid

c)

Salt

d)

Alkali

52.

The pH of pure water

a)

5.6

b)

7.0

c)

8.1

d)

0.0

53.

The color of universal indicator in pure water:

a)

Red

b)

Blue

c)

Purple

d)

Green

54.

Acids taste .....

a)

sour

b)

bitter

c)

sweet

d)

umami

55.

Which pH levels indicated a strong acid?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

56.

Strong acids and alkalis are...

a)

Sour

b)

Sweet

c)

Corrosive/Caustic

d)

Burn litmus paper

57.

A gas was tested by bringing a glowing/burning splint close to it. A pop sound was heard afterwards. What gas was tested?

a)

Oxygen

b)

Nitrogen

c)

Hydrogen

d)

Carbon dioxide

58.

Carbon dioxide is tested by passing the gas through lime water. The gas turns lime water milky/cloudy.

a)

True

b)

False

59.
Iron + Hydrochloric acid --> ?
a)
iron sulfate + water
b)
iron + hydrogen
c)
iron chloride + hydrogen
d)
iron chloride + water
60.
Complete the following reaction:
Sulphuric acid + sodium carbonate
--> 
a)
Carbon dioxide + water 
b)
calcium carbonate + water + carbon dioxide 
c)
Sodium sulphate + water + carbon dioxide 
d)
Sodium chloride + water + carbon dioxide 

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