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The key purpose of this research was to find out the effectiveness of a modular approach in teaching Chemical Elements and Compounds in order to assess the students learning, and performance. The population was Senior High School Students of Tuyom Na
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End of Unit Test
8 F
Name
Class 8 F
1 For each of the following substances, write down whether they are elements, mixtures or compounds. Write your answer in the box. The first one has been done for you as an example. Substance
Element, mixture or compound
oxygen
element
carbon dioxide copper air water soil
[5 marks]
2 Look at the diagrams below. Match the correct diagram to the description. Write the letter of the diagram in the table. A
B
Description
C
D
Diagram letter
molecules of an element molecules of a compound a mixture of different elements a mixture of elements and compounds
[4 marks]
Page 1 of 3 Exploring Science for QCA Copymaster File 8
calcium carbonate + dilute hydrochloric acid water + carbon dioxide.
→
calcium chloride solution +
She decided to try the reaction out for herself. She added the acid to the calcium carbonate.
a What would she see that shows that a reaction was taking place?
[1 mark]
b From the substances in the word equation, give: i a pure compound ii a mixture [2 marks]
c At the end of the reaction, there were still some pieces of calcium carbonate left over. How could Dina separate these solid lumps from the calcium chloride solution?
[1 mark]
d Dina then decided that she would try to get solid calcium chloride from the calcium chloride solution. Draw a diagram of the apparatus that she might use to carry out this experiment. Label your diagram.
[2 marks]
e Explain why this method would work in separating the calcium chloride from the water.
[2 marks]
Page 2 of 3 Exploring Science for QCA Copymaster File 8
4 The graph shows what happens to the temperature of a solid when it was heated until it melted. 90 80
8 F
70 ) C 60 ( e r 50 u t a r e 40 p m e T 30 °
20 10 0 0 1
2
3
4
5
6
7
8
9 10 11 12 Time (minutes)
13
14
15
16
17
18
19
20
a What happened to the temperature in the first 4 minutes?
[1 mark]
b What happened to the temperature between 4 and 10 minutes?
[1 mark]
c What is the temperature after 2 minutes?
[1 mark]
d When did the liquid start to melt?
[1 mark]
e Put a ring around the number that is closest to the melting point of the solid in degrees Celsius 40
60
80
100
120 [1 mark]
f How can you tell from these results that the solid is probably pure?
[1 mark]
g The heat was turned off after 11 minutes and the tube was left to cool. On the grid above, draw the shape of the graph that you would get. Continue the line as far as 20 minutes. [2 marks] Page 3 of 3 Exploring Science for QCA Copymaster File 8
