Nail investigation

Nail investigation

Pencil and paper
Overview
Connecting to the Curriculum
Marking Student Responses
 

Information: The boiling of water removes dissolved gases.
 
a)
 
What is the aim of this experiment?
 
 
 
 
 
b) In this experiment, what are three variables that need to be kept the same?
 
1.
 
 
  2.
 
 
  3.
 
 
 
c)
Why were two nails used in each test tube?

 
 
 
 
 
d) i)
At the end of the investigation, the nails in which test tube would have shown the greatest change?
 
Test tube:__________
 
  ii)
Describe what the nails in this test tube would look like.

 
 
 
 
 
 
e)
A second experiment was set up as shown below.
What do you think is the aim of this experiment?
 
 
 
 
 
 
 


 

Information: Calcium chloride is a drying agent, this removes moisture from the air.

 
Level:
5
Curriculum info: 
Science, Investigating in science, Material World
Key Competencies: 
Thinking
Keywords: 
changes, iron, rust, fair testing
Description of task: 
Students look at two diagrams. The first shows iron nails in test tubes with boiled water or tap water, the second shows iron nails with moisture either present or absent. Students answer five questions about these investigations.
Curriculum Links: 
Science capabilities
The capabilities focus is brought about by the conversations you have and the questions you ask.
Capability: Gather and interpret data
This resource provides opportunities to discuss the importance of controlling variables when using fair testing for an investigation.

 

Science capability: Gather and interpret data (TKI)
 
Science capabilities: 
Gather and interpret data
Answers/responses: 
 

Y10 (10/01)
a)   To determine if air is needed for iron to rust. very difficult
b)   Any 3 of: 

  • Temperature.
  • Length of time.
  • Size of nail.
  • Size of test tube/same amount of water.
  • A bung in each test tube.
 3 correct - difficult
 
2 correct - easy
 
1 correct - very easy
c)   Any 1 of: 

  • Same as conducting a repeat experiment.
  • To make it a fair test.
 moderate
d) i)
ii)		 B
Red brown or orange in colour, flakey bits
[Do not accept rust/corrosion as these are inferences and are not descriptions].		 difficult
e)   To find out if water is needed for iron to rust. very difficult