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LSS(1) C1 - C4 Revision

Total questions: 100

Worksheet time: 1hrs 14mins

Name
Class
Date
1.
You should never ______ chemicals in the lab. 
a)
taste
b)
touch
c)
smell
d)
all of the above
2.
When heating a test tube, it should be
a)
pointed away from yourself and other students
b)
held with two fingers
c)
filled completely with the liquid being heated
d)
heated over a tripod and gauze mat.
3.
What safety symbol is this? 
a)
corrosive
b)
toxic
c)
radiation
d)
biohazard
4.
what does this symbol mean?
a)
Toxic
b)
Irritant
c)
Flammable
d)
Biohazardous
5.

Which safety hazard should be labelled on a bottle of hydrochloric acid?

a)
b)
c)
d)
6.
What is the hazard shown in this hazard sign?
a)
Fire
b)
Goku
c)
Flammable
d)
Inflammable
7.

What does this hazard symbol mean?

a)

flammable

b)

oxidising

c)

hot

d)

explosive

8.

What attitude is described below?


a person shows care and concern for living things and the environment.

a)

responsible

b)

objective

c)

open-minded

d)

creative

9.

What attitude is described below?


a person continues working on problem even though it is difficult.

a)

perseverance

b)

curious

c)

objective

d)

responsible

10.

Which is an example of qualitative data?

a)

Mdm Seow has a 5 kg school bag.

b)

Mdm Low's hair is 30 cm long.

c)

Mr Kartik is stronger than Mr Chng.

d)

Mr Sim is 10 cm taller than Mrs Chia.

11.

After conducting experiments and collecting measurements, we should

a)

analyse the data for trends and patterns

b)

communicate the findings to the scientific community

c)

decide which quantities should be kept constant

d)

pose questions and form a hypothesis

12.

Mr Chng's hypothesis is, "The closer a student stays to school, the later they will be for school."

To test this, which variable should be changed?

a)

time which student reaches school

b)

frequency of bus arrivals

c)

distance which student stays from school

d)

method which student takes to come to school

13.

The SI unit of length is

a)

centimetre

b)

metre

c)

inch

d)

foot

14.

Which of the following is an example of a quantitative data collected between two fruits?

a)

A durian is green in colour but a rambutan is red.

b)

There are 9 seeds in a durian but a rambutan has only 1 seed.

c)

A durian is thorny but a rambutan is hairy.

d)

A durian is sweet but a rambutan can taste sour.

15.

What is the SI unit for Length?

a)

mm

b)

cm

c)

m

d)

km

16.

What is the SI unit for Mass?

a)

mg

b)

g

c)

kg

17.

What is the SI unit for Time?

a)

ms

b)

s

c)

min

d)

h

18.

In an experiment, the true value is 16.11 g. A student obtains the following experimental data.

12.62 g

12.65 g

12.67 g

Which correctly describes this student’s experimental data?

a)

accurate, but not precise

b)

precise, but not accurate

c)

both accurate and precise

d)

neither accurate nor precise

19.

In an experiment, the true value is 16.11 g. A student obtains the following experimental data.

16.11 g

16.12 g

16.10 g

Which correctly describes this student’s experimental data?

a)

accurate, but not precise

b)

precise, but not accurate

c)

both accurate and precise

d)

neither accurate nor precise

20.

The following reading(s) is/are incorrect due to parallax error.

a)

4.7 cm only

b)

4.8 cm

c)

4.9 cm only

d)

4.7 cm & 4.9 cm

21.

A non-luminous flame is suitable for heating as it heats a substance strongly.

a)

True

b)

False

22.

If the Bunsen burner was to be left unattended for a short while, which type of flame should be used?

a)

luminous flame

b)

non-luminous flame

23.

When heating chemicals, which of the following precautions should be taken?

(I) Wear safety gloves

(II) Wear safety goggles

(III) Point test tube away from others

a)

II only

b)

III only

c)

II and III

d)

I, II and III

24.

Name this type of flame.

(a)  

25.

What is the potential danger of the chemical with this hazard symbol?

a)

causes harm to the environment

b)

causes explosion

c)

it eats away any substances

d)

irritates the respiratory system

26.

The ability to conduct electric current is referred to as...

a)

density

b)

solubility

c)

malleability

d)

electrical conductivity

27.

The relationship between mass and volume is referred to as...

a)

density

b)

solubility

c)

malleability

d)

electrical conductivity

28.

If you poured three liquids (that do not mix completely) into a cup, how could you tell which one is the densest liquid?

a)

The liquid that is floating on top is the densest liquid.

b)

The liquid that settles to the bottom is the densest liquid.

c)

The liquid with the deep red color is the densest liquid.

d)

There is no way to tell which liquid is densest from the description.

29.

What happens to a solid object with a density that is less than water when it is placed in water?

a)

The object sinks about halfway into the water.

b)

The object displaces a quantity of water greater than its volume.

c)

The object settles to the bottom of the water.

d)

The object floats on top of the water.

30.
Why does ice float?
a)
Liquid water is less dense than solid water.
b)
Solid water is less dense than liquid water.
c)
Gaseous water is less dense than solid water.
d)
Liquid water is less dense than gaseous water.
31.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
32.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
33.

Frank has an eraser. It has a mass of 4.00 g, and a volume of 2.00 cm3. What is its density?

a)

8.00 g/cm3

b)

2.00 g/cm3

c)

0.500 g/cm3

d)

24.0 g/cm3

34.
Why do some substances float on water?
a)
they are warmer than water
b)
they are cooler than water
c)
they are more dense than water
d)
they are less dense than water
35.

Helium balloons rise in air because

a)
helium is less dense than air
b)
helium is more dense than air
c)
helium is cooler than air
d)
helium is warmer than air
36.
What units are used to measure Density?
a)
cm3/g
b)
g
c)
g/cm3
d)
cm3
37.

What is this tool to measure mass?

a)

beam balance

b)
ruler
c)
thermometer
d)

graduated cylinder

38.

True or False:  The density of a specific type of material never changes, under constant physical conditions (temperature, pressure, etc).

a)
True
b)
False
39.
Calculate the density of the cube.
a)

3.00 g/cm3

b)

4.00 g/cm3

c)

2.00 g/cm3

d)

5.00 g/cm3

40.

What is density?

a)

The amount of space an object takes up

b)

The amount of matter in a given space

c)

The amount of matter in an object

41.

When you put an object in a graduated cylinder of water and measure how much the water level changed what is this process called?

a)

Relative Density

b)

Displacement

c)

Density

42.
Which box has a higher density?  
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
43.
a)
Element
b)
Compound
c)
Mixture
44.
a)
Element
b)
Compound
c)
Mixture
45.
a)
Element
b)
Compound
c)
Mixture
46.
a)
Element
b)
Compound
c)
Mixture
47.
a)
Element
b)
Compound
c)
Mixture
48.
a)
Element
b)
Compound
c)
Mixture
49.
a)
Element
b)
Compound
c)
Mixture
50.
a)
Element
b)
Compound
c)
Mixture
51.
a)
Element
b)
Compound
c)
Mixture
52.
a)
Element
b)
Compound
c)
Mixture
53.
a)
Element
b)
Compound
c)
Mixture
54.
a)
Element
b)
Compound
c)
Mixture
55.
a)
Element
b)
Compound
c)
Mixture
56.
a)
Element
b)
Compound
c)
Mixture
57.
a)
Element
b)
Compound
c)
Mixture
58.

A pure substance that cannot be broken down into any other substance.

a)

Elements

b)

Compounds

c)

Mixtures

59.

Symbol for an element can be found on the

a)

Periodic Table

b)

Picnic Table

c)

Mixture Table

60.

A(n) ______________ is formed when two or more elements chemically combine.

a)

Compound

b)

Element

c)

Mixture

61.

A ___________ is a combination of many different elements not chemically combined.

a)

Element

b)

Compound

c)

Mixture

62.

The process of blending the ingredients when making a birthday cake would be an example of a(n)

a)

Element

b)

Compound

c)

Mixture

63.
Sugar water is a 
a)
solution
b)
suspension
c)
colloid
64.

A _______ _________ is what we call when the composition is not uniform throughout.

a)

homogeneous mixture

b)

heterogeneous mixture

65.
What type of mixture separates upon standing?
a)
Solution
b)
Alloy
c)
Colloid
d)
Suspension
66.
If you shine a light into a liquid and the light is scattered, the liquid is a
a)
solution
b)
suspension
c)
colloid
d)
suspension or colloid
67.

What type of matter is this?

a)

compound

b)

element

c)

mixture

68.

What type of matter is this?

a)

compound

b)

element

c)

mixture

69.

What type of matter is this?

a)

compound

b)

element

c)

mixture

70.

What is an Alloy?

a)

Mixture of Metals and Non-metals

b)

Mixture of two Metals

c)

Mixture of Two Non- metals

d)

Mixture of plastic and wood

71.

A solution has solute and solvent as it's components.

a)

True

b)

False

72.

What happens to the solubility of most solutes as the temperature increases?

a)

increases

b)

decreases

c)

stays the same

d)

can't predict

73.

In a ______________, one substance is dissolved in another substance.

a)

solution

b)

suspension

c)

colloid

74.
substance that dissolves the solute
a)
solution
b)
solvent
c)
saturation
d)
so
75.
If a spoonful of sugar is mixed in a glass of water, what is the water called? 
a)
solute
b)
solution
c)
solvent
d)
element 
76.
Sugar water is a 
a)
solution
b)
suspension
c)
colloid
77.
The substance that does the dissolving is known as the ______
a)
solute
b)
solvent
c)
soluble
d)
insoluble
78.

Which of the following appear to be clear (are not cloudy)?

a)

Solution

b)

Suspension

c)

Colloid

79.

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

a)

Mixture

b)

Pure substance

c)

Compound

80.
If a spoonful of salt is mixed in a glass of water, what is the water called?
a)
A. solute
b)
B. solution
c)
C. solvent
d)
D. element
81.

What does this illustrate

a)

Elements

b)

Compunds

c)

Mixture of Elements and Compunds

d)

Mixture of Compounds

82.

The maximum amount of a solute that can dissolve in a solvent is its

a)

chemical change

b)

solubility

c)

physical change

d)

mixture

83.
What type of mixture is this?
a)
heterogeneous 
b)
homogeneous
84.
Sand floating in water, but most of the sand is settled at the bottom this an example of which type of mixture?
a)
A solution
b)
A colloid
c)
A suspension
d)
A compound
85.

What method would you use to separate a mixture of salt and water so that you can get keep the salt AND the water?

a)

sorting by hand

b)

distillation

c)

chromatography

86.

Dyes in a felt-tip pen may be separated by....

a)

Distillation

b)

Decanting

c)

Chromatography

d)

Centrifuge

87.
The diagram shows the apparatus for separating soil and water. What are the labelled parts?
a)
A = distillate, B = filtrate
b)
A = filtrate, B = residue
c)
A = residue, B = filtrate
d)
A = residue, B = distillate
88.
Which one of the following is the name for separation technique in the picture below
a)
distillation
b)
dissolving
c)
evaporation
d)
decanting
89.
Which one of the following is a disadvantage of evaporation?
a)
It always requires heat
b)
It cannot be used for insoluble solids
c)
All of the solute is recovered
d)
The solvent (liquid part) is not recovered
90.

What is the name of this separation technique?

a)

Simple distillation

b)

Fractional distillation

c)

Boiling

d)

Evaporation

91.

Which ink is most soluble?

a)

Blue

b)

Red

c)

Yellow

d)

Green

92.

Which ink is a mixture?

a)

Blue

b)

Red

c)

Yellow

d)

Black

93.

Referring to the chromatogram, black ink contains

a)

Blue, red and yellow ink only

b)

Blue, red, yellow and green ink

c)

Blue and yellow ink

d)

Black ink only

94.

How can we separate an insoluble solid from a liquid?

a)

chromatography

b)

evaporation

c)

filtration

d)

condensation

95.
The clear liquid which passes through the filter paper is called
a)
filt
b)
filter
c)
filtrate
d)
filtration
96.
Which one of the following would you use to separate sand from iron filings?
a)
a bar magnet
b)
 filter paper
c)
distillation apparatus
d)
chromatography paper
97.
Water and alcohol are easily separated by distillation because of their
a)
different densities
b)
different boiling points
c)
different colours
d)
different melting points
98.

A mixture contains two substances. What property must be the two substances have for them to be separated by paper chromatography?

a)

Both substances must be soluble in the chromatography solvent,

b)

Both substances must have low boiling point.

c)

Both substances must be coloured.

d)

Both substances must be solid at room condition.

99.

What is the method suitable to obtain pure water from seawater.

a)

Simple distillation

b)

Fractional distillation

c)

Filtration

d)

Evaporation to dryness

100.
Iron and copper screws could be separated using a magnet because
a)
iron is magnetic, copper is not
b)
copper is magnetic, iron is not
c)
neither metal is magnetic
d)
copper screws are heavier than iron and fall off the magnet

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