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Y8 Chemical Reactions

Total questions: 30

Worksheet time: 16mins

Name
Class
Date
1.

What is produced in complete combustion of a fuel?

a)

Carbon

b)

Carbon monoxide

c)

Carbon monoxide and water

d)

Carbon dioxide and water

2.

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

Magnesium + Oxygen --> Magnesium oxide

a)

magnesium

b)

magnesium and oxygen

c)

magnesium oxide

d)

oxygen

3.
Which of the following is the most reactive in water?
a)
Lithium
b)
Sodium
c)
Potassium
4.

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

5.

Which of the following is MOST reactive?

a)

Lithium

b)

Lead

c)

Tin

d)

Copper

6.
What gas is always produced when a metal reacts with water?
a)
Oxygen
b)
Carbon Dioxide
c)
Hydrogen
d)
Carbon Monoxide
7.
What else is produced when a metal reacts with water? (HINT: Water has the formula H2O)
a)
Metal Oxide
b)
Metal Carbonate
c)
Metal Hydride
d)
Metal Hydroxide
8.
Metals can also react with acids. This produces a gas. What is the name of this gas?
a)
Hydrogen
b)
Carbon Dioxide
c)
Nitrogen
d)
Oxygen
9.
As well as a gas, there is another product made when an acid reacts with a metal. What is the name for this?
a)
Salt
b)
Water
c)
Alkali
d)
Carbon
10.
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
11.
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
12.
Metals have many useful properties. For example, they...
a)
...conduct electricity
b)
...are malleable
c)
...are good thermal conductors
d)
All of these
13.

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

14.

Lithium + Oxygen —> _________________

a)

Lithium hydroxide

b)

Lithium oxide

c)

Hydrogen gas

d)

Oxygen gas

15.

Which of the following does not react with water?

a)

Copper

b)

Lithium

c)

Sodium

d)

Potassium

16.

Name the products formed when zinc reacts with hydrochloric acid?

a)

zinc oxide and water

b)

zinc oxide and water

c)

zinc chloride and hydrogen gas

d)

zinc hydroxide and hydrogen gas

17.

Which one of the following metals reacts slowly with cold water?

a)

Lithium

b)

Copper

c)

Silver

d)

Calcium

18.

Which of the following metals easily get rusted to form brown deposits on it?

a)

Lead

b)

Gold

c)

Aluminium

d)

Iron

19.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

20.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
21.

6. Which of these processes is always exothermic?

a)

A. evaporation

b)

B. burning

c)

C. insulation

d)

D. melting

22.

1. Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic?

a)

A. temperature rises by 3 °C\degree C    

b)

B. temperature falls by 5 °C\degree C   

c)

C. temperature falls by 3 °C\degree C    

d)

D. temperature rises by 5 °C\degree C  

23.

4. Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the least endothermic?

a)

A. temperature falls by 3 °C\degree C    

b)

B. temperature rises by 5 °C\degree C

c)

C. temperature falls by 5 °C\degree C

d)

D. temperature rises by 3 °C\degree C

24.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
25.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
26.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
27.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
28.

5. When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as?

a)

A. exothermic    

b)

 B. activated  

c)

C. decomposition            

d)

D. endothermic

29.

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

30.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

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