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KS3 Chemistry Revision

Total questions: 115

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

An endothermic reaction...

a)

Releases energy to the surrounding area.

b)

Boils the chemicals.

c)

Evaporates the chemicals.

d)

Takes in energy from the surrounding area.

2.

An exothermic reaction...

a)

Releases energy to the surrounding area.

b)

Boils the reacting chemicals.

c)

Evaporates the reacting chemicals.

d)

Takes in energy from the surrounding area.

3.

___________ reactions feel cold.

a)

Exothermic

b)

Endothermic

c)

Chemical

4.

___________ reactions feel warm.

a)

Chemical

b)

Endothermic

c)

Exothermic

5.

What equipment would you use to determine whether a reaction is endothermic or exothermic?

a)

Balance (scales)

b)

Ruler

c)

Universal Indicator

d)

Thermometer

6.

A fizzy sweet, when eaten feels cold. Why?

a)

They are made of ice.

b)

It is dissolving.

c)

There is an endothermic reaction.

d)

There is an exothermic reaction.

7.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
8.

O2(g) + 2 H2 (g) → 2 H2O (g) + EnergyO_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy  

a)

endothermic

b)

exothermic

9.

6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2

a)

endothermic reaction

b)

exothermic reaction

10.

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

a)

The solution at the end is acidic

b)

The reaction is reversible

c)

The reaction is exothermic

d)

The reaction is endothermic

11.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

12.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
13.

6. Which of these processes is always exothermic?

a)

A. evaporation

b)

B. burning

c)

C. insulation

d)

D. melting

14.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

15.

What happens during all endothermic changes?

a)

A gas is produced.

b)

Solids melt.

c)

The temperature decreases

d)

There is a colour change.

16.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
17.

A melting ice cube is an example of

a)

exothermic

b)

endothermic

c)

none

d)

both

18.

During evaporation, water absorbs heat so that bonds can break and water vapor forms. This is an example of an _____________ reaction.

a)

endothermic

b)

exothermic

19.

When rust forms on nails, new bonds are formed and energy is released. This is an example of an _____________ reaction.

a)

endothermic

b)

exothermic

20.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
21.

In this chemical reaction, which is the product/s?

Magnesium + Oxygen --> Magnesium oxide

a)

magnesium

b)

magnesium and oxygen

c)

magnesium oxide

d)

oxygen

22.

magnesium + oxygen --> magnesium oxide

If you started with 5g of magnesium and 2.5g of oxygen, what mass of magnesium oxide would be produced?

a)

5g

b)

2.5g

c)

7.5g

d)

10g

23.
Which of the following is the product of the reaction of aluminium and oxygen?
a)
aluminium oxide.
b)
metal oxide
c)
aluminium ore
d)
aluminium and oxygen
24.

What is the scientific term given when something burns?

a)

a fuel

b)

flammable

c)

combustion

d)

heating

25.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.
26.
Which of the following reactions produces calcium oxide?
a)
calcium and oxide
b)
calcium and water
c)
calcium and air
d)
calcium and oxygen
27.
Which of the following defines oxidation?
a)
A chemical reaction where a substance gains oxygen.
b)
A chemical reaction where a substance loses oxygen.
c)
A chemical reaction where a substance loses a metal.
d)
A chemical reaction where a substance gains a metal.
28.
Which of the following is an example of an oxidation reaction?
a)
Ca  +   O2 --> CaO
b)
Na2O  + H2O --> NaOH
c)
Fe2O3   + CO --> Fe   +  CO2
d)
All of the choices are oxidation reactions.
29.
The rusting of iron is an example of
a)
a reduction reaction.
b)
an oxidation reaction.
c)
a reaction of iron with water.
d)
a reaction that dissolves iron.
30.

In a word equation, the starting chemicals are called...

a)

reactants

b)

products

c)

ingredients

31.

What was the chemical name given to Rust ?

a)

Carbon

b)

Iron Oxide

c)

Iron Oxygen

d)

Magnesium Oxide

32.

The positive test result for oxygen gas, O2 is

a)

a lit splint; gas burns with a squeaky pop

b)

a glowing splint; the splint relights

c)

it turns lime water milky / cloudy

d)

it puts out a burning splint

33.
Complete the equation below. 
Iron + Oxygen --> 
a)
Iron oxygen
b)
Iron oxide
c)
Iron oside
d)
Ion oxide
34.

what do the symbols (s), (l) and (g) mean in a chemical equation?

a)

sodium, lithium and gold

b)

sulphur, lead and germanium

c)

silver, liquid and gas

d)

solid, liquid and gas

35.

In a chemical equation what does the symbol (aq) mean?

a)

aqueous - the substance will explode if put in water

b)

aqueous solution - the substance is dissolved in water

c)

aqueous solution - the substance is dissolved in acid

d)

aqueous - the substance has reacted with water

36.

Which of the following elements react quickly with cold water?

a)

Sodium

b)

Iodine

c)

Helium

d)

Hydrogen

37.

What happens when metals react with water?

a)

Hydrogen gas is formed

b)

Metal hydroxide and hydrogen gas is formed

c)

Metal hydroxide is formed

d)

Metal oxide is formed

38.

When potassium reacts with oxygen in the air what happens?

a)

it brings out bubbles

b)

it turns into green

c)

it will stay the same

d)

it catches fire

39.

What happens when gold reacts with cold water?

a)

the gold will melt

b)

the gold will turn into light yellow

c)

nothing, the gold can't react with cold water

40.
How can you tell that a metal is reacting with water?
a)
Colour change
b)
Bright light
c)
Fizzing
d)
It gets colder
41.
How can you test to show that when a metal reacts with water, hydrogen gas is produced?
a)
Relights a glowing splint
b)
A lit splint produces a squeaky pop
c)
Puts out a burning splint
d)
Is cold to the touch
42.
What metal hydroxide is produced when magnesium reacts with water?
a)
Copper hydroxide
b)
Magnesium oxide
c)
Magnesium
d)
Magnesium hydroxide
43.
What gas is always produced when a metal reacts with water?
a)
Oxygen
b)
Carbon dioxide
c)
Hydrogen
d)
Carbon monoxide
44.
What can you conclude if a metal doesn't fizz when added to water or an acid?
a)
It has low reactivity
b)
It may react with a stronger acid
c)
It has high reactivity
d)
There is no metal present
45.
Alkali metals are found in which group of the periodic table?
a)
Group 1
b)
Group 2
c)
Group 7
d)
group 8 
46.
Which of the following is the most reactive in water?
a)
Lithium
b)
Sodium
c)
Potassium
47.
What is formed when sodium reacts with water?
a)
sodium oxide and hydrogen
b)
sodium hydroxide and hydrogen
c)
sodium hydroxide and oxygen
d)
sodium hydroxide and carbon dioxide
48.
What is the symbol equation for the reaction between sodium hydroxide and water?
a)
2Na + 2H2O → 2NaOH + H2
b)
Na + H2O → NaOH + H
c)
Na + H20 → NaCl + CO2
d)
2Na + 2H2O → 2NaH2 + O2
49.
Which of the following is NOT an alkali metal
a)
Li
b)
Cl
c)
K
d)
Cs
50.
When a metal reacts with oxygen gas, the product is ...
a)
metal hydroxide
b)
metal oxide
c)
metal oxide and oxygen
d)
metal hydroxide and hydrogen gas
51.
When sodium reacts with hydrochloric acid, what is the name of the salt formed?
a)
Sodium Hydride
b)
Sodium Chloride
c)
Sodium Hydrochloric
d)
Sodium Chlorine
52.
When potassium reacts with sulphuric acid, what is the name of the salt produced?
a)
Potassium Sulphide
b)
Potassium Sulphur
c)
Potassium Sulphuric
d)
Potassium Sulphate
53.
Acid + Metal --> ?
a)
Salt + Water
b)
Salt + Hydrogen
c)
Salt
d)
Hydrogen
54.
Iron + Hydrochloric acid --> ?
a)
iron sulfate + water
b)
iron + hydrogen
c)
iron chloride + hydrogen
d)
iron chloride + water
55.
Magnesium + sulphuric acid --> ?
a)
magnesium sulfate + water
b)
magnesium sulfate + hydrogen
c)
magnesium chloride + hydrogen
d)
magnesium chloride + water
56.
Zinc + nitric acid --> ?
a)
zinc sulfate + water
b)
zinc sulfate + hydrogen
c)
zinc nitrate + hydrogen
d)
zinc chloride + water
57.
When group 1 metals react with water they produce a metal ______?
a)
oxide
b)
hydroxide
c)
sulfate
d)
peroxide
58.

Metal + Acid -> ___ + ___

a)

Salt + Hydrogen

b)

Metal Hydroxide + Hydrogen

c)

Metal Oxide + Hydrogen

d)

Metal Carbonate + Hydrogen

59.

Sodium + Hydrochloric acid ->

a)

Sodium chlorine

b)

Sodium chlorine + hydrogen

c)

Sodium chloride + hydrogen

d)

Sodium chloride

60.

Lithium + nitric acid ->

a)

Lithium nitride + hydrogen

b)

Lithium nitric + hydrogen

c)

Lithium nitrogen + hydrogen

d)

Lithium nitrate + hydrogen

61.

Which of the following is more reactive?

a)

Calcium

b)

Magnesium

c)

Zinc

d)

Magnesium

62.

Will the following reaction take place?


Ni + NaCl ->

a)

NO

b)

YES

63.
A displacement reaction will occur when...
a)
a more reactive metal displaces a less reactive metal from its compound.
b)
A less reactive metal displaces a more reactive metal from its compound
c)
Displacement only occurs when two of the same metals are reacted 
d)
Displacement reactions will only occur in metals above iron in the reactivity series
64.

What will the products of this reaction be?

calcium + zinc nitrate --------->

a)

Calcium + zinc nitrate

b)

Zinc + calcium nitrate

c)

there will be no reaction

d)

Zinc + calcium chloride

65.
Which of the following will not undergo reaction?
a)
zinc metal  +  zinc oxide 
b)
iron metal  +  copper oxide
c)
zinc metal +  iron oxide
d)
magnesium  +  iron oxide
66.
Which gas gives out a 'squeaky pop' when a lit splint is placed in it?
a)
hydrogen
b)
oxygen
c)
carbon dioxide
d)
nitrogen
67.

Which of the following is more reactive?

a)

Calcium

b)

Magnesium

c)

Zinc

d)

Magnesium

68.
How can you tell that a metal is reacting with water?
a)
Colour change
b)
Bright light
c)
Fizzing
d)
It gets colder
69.

Which of the following is MOST reactive?

a)

Lithium

b)

Lead

c)

Tin

d)

Copper

70.

Which metal is more reactive than calcium?

a)

magnesium

b)

potassium

c)

silver

d)

aluminum

71.

True or False:

Magnesium is more reactive than silver.

a)

True

b)

False

72.

True or False:

Lead is more reactive than iron.

a)

True

b)

False

73.

In a displacement reaction, it is the ____________ reactive metal that is displaced from a compound.

a)

Heaviest

b)

Least

c)

Most

d)

Worst

74.

In the following reaction, which metal has been displaced?

copper sulfate + magnesium → magnesium sulfate + copper

a)

magnesium

b)

copper

c)

sulfate

75.

Complete the word equation:

lithium + silver nitrate →

a)

lithium + silver nitrate

b)

lithium + silver nitrite

c)

silver + lithium nitrate

d)

silver + lithium nitrite

76.

Use the following observations to select the correct reactivity series (highest to lowest).


calcium + water: slow

sodium + water: fast

calcium + dilute acid: very fast

gold + dilute acid: no reaction

aluminium + dilute acid: fast

a)

calcium, sodium, aluminium, gold

b)

sodium, calcium, aluminium, gold

c)

sodium, aluminium, calcium, gold

d)

gold, aluminium, calcium, sodium

77.
What will be reaction if less reactive metal is added in a solution with more reactive metal compound?
a)
vigorous reaction
b)
fizzing gas produced
c)
burns moderately
d)
no reaction
78.

Alkali metal + Water —> _____________ + ____________

a)

metal hydroxide and oxygen gas

b)

metal hydroxide and hydrogen gas

c)

metal oxide and oxygen gas

d)

metal oxide and hydrogen gas

79.

Lithium + Oxygen —> _________________

a)

Lithium hydroxide

b)

Lithium oxide

c)

Hydrogen gas

d)

Oxygen gas

80.

What is the correct decreasing order of metal reactivity with water ?

a)

Mg > Na > Li > K

b)

Mg > Li > Na > K

c)

Na > Li > Mg > K

d)

K > Na > Li > Mg

81.

Aluminium carbonate + Sulfuric acid —> _______________ + __________________ + water

a)

Aluminium sulfide + Oxygen

b)

Aluminium sulfate + Hydrogen

c)

Aluminium sulfate + Carbon dioxide

d)

Aluminium sulfide + Carbon dioxide

82.

Which of the following metals is kept under oil ?

a)

Copper

b)

Gold

c)

Zinc

d)

Potassium

83.

What is the most likely identity of the metal on the filter paper?

a)

Copper, because it is grey.

b)

Potassium, because it can be cut with a knife showing it is soft.

c)

Iron, because it looks grey and all iron looks grey.

84.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
85.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
86.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
87.

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 particle collisions

d)

it increases the frequency of particle collisions

88.

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

a)

it increases both the frequency and energy of particle collisions

b)

it only increases the frequency of particle collisions

c)

it only increases the energy of particle collisions

d)

it reduces the activation energy of the reaction

89.
Catalysts are thought to increase the rate of a chemical reaction by
a)
supplying the energy needed to overcome the activation energy
b)
increasing the temperature of the reaction
c)
providing less surface area for the reaction
d)
providing an alternative reaction pathway with a lower activation energy
90.
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
91.

Diagram 4 shows the graph of volume of carbon dioxide gas against time when 5 g of marble chips is added to

50 cm3 of 0.2 mol dm-3 hydrochloric acid.


At what time the rate of reaction the highest?

a)

t1

b)

t2

c)

t3

d)

t4

92.

Diagram 7 shows a graph of the volume of gas produced against time for the reaction between zinc granules and hydrochloric acid.


The gradient of the graph decreases with time because

a)

catalyst is not used

b)

volume of mixture decreases

c)

temperature of reaction decreases

d)

concentration of hydrochloric acid decreases

93.

The equation represents the reaction between sodium carbonate and hydrochloric acid.

Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2


The mass of the beaker and its contents is plotted against time.

Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid?

a)
b)
c)
d)
94.

Table 9 shows the experiments carried out to study the rate of reaction between zinc carbonate and nitric acid.


Which of the following graph represents the two experiments?

a)
b)
c)
d)
95.

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

96.

Which factors increase the rate of a reaction?

a)

increasing temperature

b)

increasing concentration

c)

increasing total surface area

d)

All of these

97.

Increasing the temperature gives particles more __________.

a)

time

b)

energy

c)

space

d)

frequency

98.
Order the letters from highest to lowest rate of reaction.
a)
A > B > C > D
b)
A > BC > D (B and C have the same rate)
c)
A > B > CD (C and D have the same rate)
d)
D > C > B > A
99.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

100.

A temperature increase causes the particles ......

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

101.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
102.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

103.
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
104.

Which reactant had a larger surface area?

a)

A

b)

B

105.

How does a catalyst work in speeding up a reaction?

a)

By lowering the amount of energy to cause a reaction

b)

by giving them more energy

c)

by making them more available

106.

What equipment would you use to collect and measure gas released in a reaction?

a)

Boiling tube

b)

Measuring cylinder

c)

Conical flask

d)

Gas syringe

107.

When ___________ increases, the ___________ increase.

a)

temperature, number of particles

b)

temperature, energy of particles

c)

concentration, energy of particles

d)

surface area, energy of the reaction

108.

On a graph like this, what shows us the fastest part of the reaction?

a)

horizontal line

b)

steep gradient

c)

gradient

d)

shallow gradient

109.

Objects hitting each other

a)

Collision

b)

Catalyst

c)

Explosion

d)

Reaction

110.

The speed at which a chemical reaction occurs

a)

Fast

b)

Slow

c)

Rate

d)

Ratio

111.

The amount of something; how many particles in a volume of a mixture

a)

Rate

b)

Collision

c)

Catalyst

d)

Concentration

112.

How is this equipment being used to measure the rate of reaction?

a)

The gas syringe measures how much gas is produced in a certain time

b)

The reaction mixture will increase in volume in a certain time

113.

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

a)
b)
c)
d)
114.
In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 
a)
A
b)
B
c)
C
d)
D
115.
Identify where the reaction has finished
a)
A
b)
B
c)
C
d)
D

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