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Science 8 SE Revision S2

Total questions: 125

Worksheet time: 2hrs 34mins

Name
Class
Date
1.
Which one of the following shows discontinuous variation?
a)
Eye colour
b)
Height
c)
Strength
d)
Weight
2.
Which one of the following shows continuous variation?
a)
Blood group
b)
Height
c)
Male or female
d)
Tongue rolling
3.
Which one of the following is an environmental variation?
a)
Attached ear lobes
b)
Eye colour
c)
Male or female
d)
Short hair
4.
Differences between members of the same species are called
a)
predators
b)
traits
c)
selections
d)
variations
5.

What does this sign mean?

a)

corrosive

b)

explosive

c)

flammable

d)

toxic

6.

Which of the following would increase the rate of a chemical reaction?

a)

Freezing the chemicals

b)

Increasing the temperature of the reagents

c)

Removing a catalyst

d)

Using less chemicals

7.

Which of the following would increase the rate of a chemical reaction?

a)

Removing a catalyst

b)

Diluting the chemicals

c)

Decreasing the temperature

d)

Adding a catalyst

8.

Which of the following would increase the rate of a chemical reaction?

a)

Lowering temperatrure

b)

Removing a catalyst

c)

Making the chemicals more concentrated

d)

Using less chemicals

9.

Which colour on the graph would represent the solution with the higher temperature?

a)

Red

b)

Blue

c)

None

d)

Both

10.

Which of the following would increase the rate of CO2 made using marble chips and HCl?

a)

Lowering the temperature

b)

Crushing the marble chips

c)

Using less acid

d)

Using bigger marble chips

11.
The burning of fuels , such as coal, natural gas, or oil involves a(n) __________reaction.
a)
chemical
b)
physical
12.
All reactions require activation energy.
a)
True
b)
False
13.

An enzyme (biological catalyst) increases the rate of a reaction.

a)

True

b)

False

14.
Increasing the temperature of a reaction will __________ the rate of the reaction.
a)
increase
b)
decrease
15.
In an ____________reaction, energy is released.
a)
exothermic
b)
endothermic
16.

Look at the picture. What method is used to measure the rate of reaction according to the picture?

a)

Product's mass measuring.

b)

Product volume measuring.

c)

Reactant volume measuring.

d)

Reactant's mass measuring.

17.

A student add marble chip into hydrochloric acid to produce carbondioxide bubble. Which way cannot ben used to speed up the chemical reaction?

a)

Adding more marble chip.

b)

Using high concentration of hydrochloric acid.

c)

Use marble powder.

d)

Heat the chemical reaction.

18.

Which of the following is the meaning of activation energy?

a)

The maximum energy that the particles need to produce effective collision

b)

The amount of energy used by the particles during a collision

c)

The minimum amount of energy that particles must have in order to react

d)

The amount of kinetic energy of molecules during a collision

19.

Increase in temperature causes the particles to

a)

slow down

b)

move faster

c)

stay apart from each other

d)

move in the correct order

20.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of reactant particles

d)

it increases the frequency of collision

21.

Why does a higher temperature increase the rate of a reaction?

a)

It increases both the frequency collision and energy of reactant particles

b)

It only increases the frequency of collision

c)

It only increases the energy of reactant particles

d)

It reduces the activation energy of the reaction

22.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
23.

Grinding an effervescent tablet into powder increases the rate of reaction due to increase of

a)

concentration

b)

total surface area

c)

temperature

d)

size

24.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
25.
Identify the 'evaporating basin' from the diagrams.
a)
A
b)
B
c)
C
d)
D
26.

How do you remove the water to leave solid copper sulfate crystals?

a)

Filter

b)

Evaporate

c)

Distill

27.
Salts that are made with sulfuric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
28.

What does the word insoluble mean?

a)

Does dissolve

b)

Doesn't dissolve

c)

Is part of a solid

29.

Filtration is used to separate a ______ from a liquid.

a)

undissolved solid

b)

dissolved solid

c)

dissolved gas

d)

undissolved gas

30.

Complete the following word equation:

Metal + Acid -->

a)

Salt + water

b)

Salt + hydrogen

c)

Salt + Water + Carbon dioxide

31.

Complete the following word equation:

Metalcarbonate + acid -->

a)

Salt + Hydrogen

b)

Salt + Water + Carbon Dioxide

c)

Salt + Water

32.

How do you remove the water to leave solid copper sulfate crystals?

a)

Filter

b)

Evaporate

c)

Distill

33.

What is the correct order for making a salt?

a)

dissolve metal oxide in acid -> evaporate -> filter

b)

dissolve metal oxide in acid -> filter -> evaporate

c)

filter -> dissolve metal oxide in acid -> evaporate

d)

filter -> evaporate -> dissolve metal oxide in acid

34.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

35.

The temperature increases outside of this reaction

a)

exothermic

b)

endothermic

c)

both

d)

none

36.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

37.

photosynthesis is an example of

a)

Exothermic reaction

b)

Endothermic reaction

c)

both

d)

none

38.

Which of the following is true in an endothermic reaction?

a)

heat is released; bond forming process

b)

heat is absorbed; bond breaking process

c)

heat is released; bond breaking process

d)

heat is absorbed; bond forming process

39.

Which of the following would NOT increase the rate at which a sugar cube dissolves?

a)

Reducing the amount of solvent

b)

Crushing the sugar cube

c)

Stirring the solution

d)

Heating the solvent

40.

You can make a solute dissolve more quickly in a solvent by

a)

adding more solute.

b)

adding ice.

c)

heating the solvent.

d)

removing some solvent.

41.

Which of the following is a salt?

a)

sodium hydroxide

b)

hydrochloric acid

c)

calcium oxide

d)

ammonium chloride

42.

It is the medium in which matter is dissolved.

a)

Solubility

b)

Solution

c)

Solvent

d)

Solute

43.
Salts that are made with nitric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
44.

A salt is formed when nitric acid combines with sodium hydroxide. What is the name of the salt?

a)

sodium chloride

b)

sodium nitrate

c)

hydrogen nitrate

d)

sodium sulfate

45.

Which two chemicals could you react to make only potassium chloride and water?

a)

potassium and hydrochloric acid

b)

potassium hydroxide and hydrochloric acid

c)

potassium oxide and sulfuric acid

d)

potassium and sulfuric acid

46.
What products are produced when we react an acid with an alkali?
a)
salt + carbon dioxide + water
b)
salt + hydrogen
c)
salt + water
d)
salt + water + hydrogen
47.
Which food is the most acidic?
a)
bananas
b)
lemon juice
c)
orange juice
48.
Salts that are made with hydrochloric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
49.
____________ can be corrosive.
a)
acids
b)
bases
c)
acids and bases
d)
neutral substances
50.

What are the products if magnesium reacts with hydrochloric acid?

a)

Magnesium chloride + Hydrogen

b)

Magnesium sulfate + Hydrogen

c)

Magnesium oxide + Hydrogen

d)

Magnesium sulfide + Hydrogen

51.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
52.

nitric acid + magnesium carbonate --> ..........+...........+............

a)

magnesium nitrate + water

b)

magnesium oxide + water

c)

magnesium oxide + water + hydrogen

d)

magnesium nitrate + water + carbon dioxide

53.

The chemical industry makes hundreds of thousands of tonnes different salts. Many methods for making salt starts with acids. Salts made from carbonic acid are called .....

a)

chlorides

b)

sulfates

c)

nitrates

d)

carbonates

54.

You can neutralize acid by adding a base that is just as strong?

a)

True

b)

False

55.
To protect tooth decay we are advised to brush our teeth regurlarly.The toothpaste is
a)
acidic
b)
neutral
c)
basic
d)
corrosive
56.

Sections of DNA that have instructions for a specific trait are called _______________

a)

Blueprints

b)

Heterozygous

c)

Genes

d)

Fragment

57.

Chromosomes are _______________

a)

Long strands of DNA that contain many genes

b)

Made of 20 pairs

c)

Bundles of DNA that contain only one gene each

d)

Found in the mitochondria

58.

The passing of physical characteristics, or traits, from parent to offspring. ___________

a)

Genetics

b)

Heredity

c)

Dominant

d)

Recessive

59.

Different versions of the same gene are called _____

a)

genes

b)

alleles

c)

variation

d)

genotype

60.

If two alleles are the same for a certain trait they are considered ______

a)

Homozygous

b)

Heterozygous

61.

A trait that always shows up when the allele is present ________

a)

recessive

b)

dominant

c)

genotype

62.

A trait that is always hidden when the dominant allele is present ______

a)

recessive

b)

dominant

c)

genotype

d)

phenptype

63.

A hot air balloon rising is an example of ...

a)

conduction

b)

convection

c)

radiation

d)

connection

64.

Eggs cooking in a frying pan

a)

convection

b)

conduction

c)

radiation

d)

connection

65.

A blow dryer uses __________ to dry your hair.

a)

convection

b)

conduction

c)

radiation

d)

connection

66.

Warming up near a campfire is an example of ...

a)

conduction

b)

convection

c)

radiation

d)

connection

67.

Which of the following is an example of a Thermal Conductor?

a)

Plastic

b)

Styrofoam

c)

Wood

d)

Copper

68.

Which of the following is an example of a Thermal Insulator?

a)

Iron

b)

Aluminum

c)

Wood

d)

Copper

69.
Which is a nonrenewable source of energy?
a)
nuclear
b)
wind
c)
sunlight
d)
biomass
70.

Which is a nonrenewable source of energy?

a)

solar

b)

wind

c)

coal

d)

geothermal

71.
Which is a renewable source of energy?
a)
coal
b)
uranium
c)
ocean tides
d)
natural gas
72.

An energy source that is gone forever once it is used up is called?

a)

renewable

b)

nonrenewable

c)

natural resource

d)

raw material

73.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
74.

Transfer of thermal energy by means of currents in fluids is termed as

a)

Conduction

b)

Convection

c)

Radiation

d)

Convection and Radiation

75.

Cooking utensils are a good example of

a)

Conduction

b)

Convection

c)

Radiation

d)

Conduction and Radiation

76.

Poor conductors of heat and electricity are termed as

a)

Electrolytes

b)

Consumers

c)

Insulators

d)

Conductors

77.

Process in which thermal energy is transferred by emission of electromagnetic wave is termed as ....

a)

Conduction

b)

Convection

c)

Radiation

d)

Conduction and Convection

78.

What is NOT a renewable energy source?

a)

coal

b)

wind

c)

solar

d)

water

79.

Which is NOT a non-renewable energy source?

a)

coal

b)

oil

c)

wind

d)

gas

80.

I would use this piece of equipment to ...

a)

find the weight of a substance.

b)

to find the volume of a liquid.

c)

to find the mass of a substance.

d)

to see if I have lost weight.

81.

What is this piece of laboratory equipment called?

a)

Test tube

b)

Beaker

c)

Boiling tube

d)

Flask

82.

What is this piece of laboratory equipment called?

a)

A coaster

b)

A metal gauze

c)

A place mat

d)

A heatprof mat

83.

Used to measure specific volume of liquid

a)

beaker

b)

measuring cylinder

c)

test tube

d)

erlenmyer flask

84.

Used to hold the test tubes and keep from spilling

a)

test tube

b)

test tube rack

c)

pipette

d)

mortar

85.

Used to measure the temperature of an object

a)

hot plate

b)

thermometer

c)

petri dish

d)

temperature

86.
You should never ______ chemicals in the lab. 
a)
taste
b)
touch
c)
smell
d)
all of the above
87.
Name this item
a)
weighing boat 
b)
funnel 
c)
wash bottle 
d)
Erlenmeyer flask 
88.
Name the equipment
a)
test tube pin
b)
test tube metal
c)
test tube coil
d)
test tube clamp
89.
Name the equipment
a)
thermometer
b)
test tube rack
c)
beaker
d)
dropper pipette 
90.
Name the equipment 
a)
thermometer
b)
dropper pipette 
c)
burette
d)
stirring rod 
91.
Name the equipment
a)
goggles 
b)
googles 
c)
safety googles
d)
safety goggles
92.
Name the equipment
a)
thermometer
b)
spring scale
c)
scale
d)
hook scale
93.
A 5 kg bowling ball, a 0.25 kg baseball, and a 0.05 kg golf ball are dropped from a 100-meter high building. A camera catches the motion of the balls as they pass specific markers (in meters, m) on the building. The times (in seconds, s) that each object passes the markers are listed in the table below. Which of the following conclusions is true?
a)
Light objects fall faster than heavy ones.
b)
All objects fall at the same rate regardless of mass.
c)
Heavy objects fall faster than light ones.
d)
Objects of different shapes fall at the same rate
94.
Tony recorded data from his chemistry experiment in the following table.  Which of the categories from Tony's data table includes qualitative observations?
a)
color
b)
temperature
c)
mass
d)
volume
95.
Which of the following units would be the most appropriate for measuring the length of a football field?
a)
mililiters
b)
centimeters
c)
meters
d)
kilometers
96.
The level of closeness between multiple measurements of the same quantity is called __________.
a)
accuracy
b)
similarity
c)
precision
d)
congruence
97.
Mr. Swanson's science class used a thermometer to measure the outside temperature each day throughout the school year.
They used their results to make the graph below.

Which month had an average daily temperature of around 41 degrees?
a)
May
b)
April
c)
December
d)
March
98.
The pictures below show a field that is being studied over time. In the field, there are rabbits (red circles) and foxes (blue circles). What conclusion can be drawn from these observations?
a)
The number of foxes decreases as the number of rabbits increases.
b)
The number of rabbits and foxes remains constant over time.
c)
The number of foxes remains constant while the number of rabbits decreases.
d)
The number of foxes increases while the number of rabbits decreases.
99.
Directions: Select the correct graph.
Mikey had two mice that were about the same age and weight. Mikey fed each of the two mice a different feed for a month. He measured how much the mice weighed every two days until the month was over. Mikey's results showed that although both mice gained weight over the month, mouse 2 gained more weight than mouse 1.Which graph below best shows these results?
a)
1
b)
2
c)
3
d)
4
100.
A scientist collected the following data on algal growth during an experiment:
Which of the following conclusions could be drawn from the data? 
a)
Algae multiply most rapidly at 35°C.
b)
Algae multiply most slowly at 20°C.
c)
Algae multiply most slowly at 10°C.
d)
Algae multiply most rapidly at 20°C.
101.
Sean enjoys studying the stars. He used a photometry tool to calculate several stars' apparent magnitudes (how bright a star looks in the sky). He then researched the stars' distances from Earth. He recorded his results in the table below.
What conclusions can Sean draw from his chart?
a)
A star's apparent magnitude increases as its distance from Earth increases.
b)
A star's apparent magnitude decreases as its distance from Earth increases.
c)
A star's apparent magnitude decreases if it is very close to another star.
d)
A star's apparent magnitude is not directly related to its distance from Earth.
102.
Which of the nutrients in the chart was provided by milk only? A. B. C. D.
a)
Protein
b)
Niacin
c)
Calcium
d)
Iron
103.
Mary thought that the number of frogs in the neighborhood pond had decreased over the last few years. So, she decided to count the number of frogs she saw around the pond twice each day for ten days. Mary's data is displayed in the table below. Based on her observations, which of the following can Mary infer? 
a)
Frogs are consumed by predators in the morning and are reborn in the evening.
b)
The number of frogs at the pond has steadily declined over the last 2 years.
c)
The number of frogs at the pond has steadily increased over the last 2 years.
d)
Frogs rest during the afternoon and become more active in the evening.
104.

How many students scored between 95 and 100?

a)

11

b)

6

c)

9

d)

14

105.
How many students are between 48 and 51 inches tall?
a)
14
b)
8
c)
2
d)
0
106.
How many cities have temperatures between 70 degrees and 99 degrees?
a)
44
b)
34
c)
26
d)
62
107.
There are 200 vegetable plants in a garden.  How many of the vegetable plants are green beans?
a)
16
b)
24
c)
28
d)
32
108.

Which of the following is completely determined by your genes?

a)

Your weight

b)

Your bone structure

c)

Your personality

d)

Your intelligence

109.

How many pairs of chromosomes exist in each of your cells?

a)

10

b)

12

c)

19

d)

23

110.

What is heredity?

a)

A kind of genetic disorder

b)

The way that DNA divides

c)

A trait you inherit from your parents

d)

The passing down of traits from parents to children

111.

What are renewable resources?

a)

A limited amount and cannot be replaced in a human life time.

b)

Plastic bags

c)

Coal, oil, and natural gas

d)

Can be replaced in our lifetime through natural processes

112.

Sunlight is...

a)

Very bright

b)

Will eventually run out soon

c)

A renewable resource

d)

A nonrenewable resource

113.

Wood is...

a)

A renewable resource

b)

A nonrenewable resource

c)

Used to make oil

d)

Used to make plastic

114.

A group of non-renewable resources, called ______________, include coal, oil, and natural gas.

a)

Fossils

b)

Energy

c)

Resources

d)

Fossil fuels

115.

Coal comes from...

a)

from animals that died millions of years ago.

b)

from plants that died millions of years ago.

c)

A factory

d)

Burning fossil fuels

116.

Oil is used to make...

a)

gasoline & other types of fuel

b)

plastics, DVDs, and tires

c)

Energy

d)

All of the above

117.

Some renewable and non-renewable resources can hurt the environment. Which statement is true?

a)

Burning wood can pollute our atmosphere

b)

Burning coal releases gases and smoke into the atmosphere.

c)

Oil spills in the ocean can affect ships.

d)

Wind energy can cause harm to plants.

118.

How so we get energy from the sun?

a)

Sunlight can generate electricity straight from the sky.

b)

Solar panels use the sun to power turbines.

c)

Solar panels can convert sunlight into electrical energy.

d)

Solar panels generate their own electricity.

119.

What is geothermal energy?

a)

A power plant.

b)

Heat energy generated and stored in the Earth.

c)

Nuclear Energy

d)

A nonrenewable resource

120.

What is an advantage of using hydropower (water) as an energy source?

a)

uses existing bodies of water.

b)

may divert water and alter normal water flow.

c)

might disrupt the movements of animals.

d)

sometimes causes flooding in surrounding areas.

121.

A disadvantage of this energy source is that it pollutes the air with gases.

a)

hydropwer

b)

wind

c)

coal

d)

solar

122.

One disadvantage to this source is that it's not effective in certain weather.

a)

Sun

b)

Coal

c)

Nuclear

d)

Biomass

123.
Why are fossil fuels considered nonrenewable resources if they are still forming beneath the surface today?
a)
They are being formed as a type of methane which we cannot use.
b)
They are being formed too far beneath the surface.
c)
The fossil fuels are being broken down by a natural process.
d)
We are depleting the fossil fuels much faster than they can form.
124.
Natural Gas is a __________ energy resource.
a)
Renewable
b)
Nonrenewable
125.
Some power plants pump water down deep holes into hot rock. The hot rock heats the water, which turns the water into steam. The steam rushes back to Earth’s surface and is used to make electricity. This plant is generating which alternative energy resource?
a)
biomass
b)
wind
c)
solar energy
d)
geothermal energy

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