Nail investigation

This task is about investigating how an iron nail rusts.
diagram of a science experiment with iron nails in test tubes
Information: The boiling of water removes dissolved gases.

Question 1Change answer

a)  What is the aim of this experiment?

Question 1Change answer

b)  In this experiment, what are three variables that need to be kept the same?
1. 
2. 
3. 

Question 1Change answer

c)  Why were two nails used in each test tube?

Question 1Change answer

d) i)  At the end of the investigation, the nails in which test tube would have shown the greatest change?
Test tube: AB

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ii)  Describe what the nails in this test tube would look like.

Question 1Change answer

Information: Calcium chloride is a drying agent, this removes moisture from the air.
 
e)  A second experiment was set up as shown above. What do you think is the aim of this experiment?