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4.4 Chemical change

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

solid state symbol

a)

s

b)

g

c)

l

d)

aq

2.

gas state symbol

a)

g

b)

l

c)

aq

d)

s

3.

A dissolved salt state symbol

a)

aq

b)

s

c)

l

d)

g

4.

23g of chemical A reacts with 10g of chemical B to make chemical C. Chemical C is the

a)

product

b)

reactant

5.

23g of chemical A reacts with 10g of chemical B to make chemical C. Chemical A and B are

a)

reactants

b)

products

6.

23g of chemical A reacts with 10g of chemical B to make chemical C. The mass of chemical C will be

a)

33g

b)

3g

c)

13g

7.

10g of calcium carbonate is added to 100g of acid. The combined mass after the reaction is 105g. The 5g drop i mass is due to

a)

gas being given off

b)

an exothermic reaction

c)

a endothermic reaction

8.

calcium carbonate will thermally decompose when heated- to give off carbon dioxide gas. The other product is

a)

Calcium oxide

b)

calcium

c)

magnesium

d)

oxygen

9.

copper oxide + carbon produces copper and carbon dioxide, this is a

a)

displacement reaction

b)

neutralisation reaction

c)

swapping reaction

d)

trading places reaction

10.

Aluminium ore is

a)

Aluminium oxide

b)

pure aluminium

c)

aluminium mixed with magnesium

11.

A displacement reaction will happen if aluminium oxide is heated with Carbon

a)

false

b)

true

12.

Aluminium oxide and carbon do not react because

a)

aluminium is more reactive than carbon

b)

carbon is more reactive than aluminium

c)

they can't be bothered

13.

Aluminium oxide is refined by electrolysis

a)

true

b)

false

14.

Aluminium ions have a positive charge, this is true of all metal ions

a)

true

b)

false

15.

Aluminium ions will migrate to the

a)

negative electrode

b)

postive electrode

16.

What will you observe at the negative electrode

a)

aluminium metal coating the electrode

b)

oxygen bubble being given off

c)

nothing

17.

to which electrode will the oxygen migrate to

a)

positive electrode

b)

negative electrode

18.

2 Oxygen ions will lose 2 electrons each at the negative electrode, and

a)

become an oxygen element

b)

become a oxygen ion

19.

The carbon electrode is hot, and reacts with the oxygen made to form

a)

carbon dioxide

b)

carbon monoxide

c)

nitrogen

d)

hydrogen

20.

Not a required practical in this unit

a)

density

b)

making soluble salts

c)

electrolysis

d)

titrations