Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved.
Stirring - Time (sec)
No stirring - 25
Slow stirring - 18
Medium stirring - 10
Fast stirring - 6
Which conclusion should Salim draw?
a) Salt will not dissolve in water unless the water is stirred.
b) Stirring water increases the rate at which a salt dissolves.
c) Stirring water decreases the rate at which a salt dissolves.
d) Stirring has no effect on the rate at which a salt dissolves.
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To answer this question, we need to analyze the data provided. Salim added 1 g of salt to each of four beakers filled with water and stirred the water at different speeds. Salim then recorded how long it took for the salt to dissolve in each case.
Let's examine the data:
No stirring - 25 seconds
Slow stirring - 18 seconds
Medium stirring - 10 seconds
Fast stirring - 6 seconds
From this data, we can observe that as the stirring speed increases, the time it takes for the salt to dissolve decreases. This means that stirring water increases the rate at which the salt dissolves.
Therefore, the conclusion Salim should draw is:
b) Stirring water increases the rate at which a salt dissolves.