material world
 : Salt Solutions
 35k
Approach: One to one Level: Year 4 & year 8
Resources: 2 beakers; table salt; rock salt; 1 teaspoon; 2 stirrers; water in a jug; clock; laminated results sheet; erasable felt pen.

Questions / instructions:
We call this activity 'salt solutions.'

You are going to do an experiment to find out which of these two types of salt dissolves faster.

Your experiment needs to be a fair test. A fair test is an experiment where most things are kept the same so that any differences in the results happen because of what you are trying to find out.
  % responses
y4
y8

1. How will you do your experiment?
    What do you think your experiment will show?

Rating: very good
moderate
poor

9
46
45
32
56
12

2. Do your experiment now.
    Write down on the results sheet how long it took for each type of salt to dissolve.

Rating: very good
moderate
poor

9
63
28
39
55
6

3. Why do you think this happened?
    Prompt: Why was this one quicker?

Rating: very good
moderate
poor

1
55
44
8
71
21

Results sheet
Write down how long it took for each type of salt to dissolve:

1. Table salt took _____ seconds to dissolve.

2. Rock salt took _____ seconds to dissolve.


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