Carbonate reactions

Carbonate reactions

Auto-markingPencil and paperOnline interactive
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about  setting up a fair test.
Stacey wanted to find out whether calcium carbonate or sodium carbonate reacted faster with vinegar. Using the apparatus shown, she decided to do this by observing how long it took for the carbon dioxide released to turn lime water milky.
carbonate reactions experiment
 
Tick whether or not Stacey must include each step to make this a "fair" test.

Question

a)  Same amounts of calcium carbonate and sodium carbonate.

    • Yes

    • No

Question

b)  Identical test tubes for the reaction.

    • Yes

    • No

Question

c)  Trials must be carried out at exactly the same time.

    • Yes

    • No

Question

d)  Vinegar used should be of same type and amount.

    • Yes

    • No

Question

e)  Solid should be stirred thoroughly with the vinegar.

    • Yes

    • No

Task administration: 
This task can be completed with pencil and paper or online with auto-marking.
Level:
5
Curriculum info: 
Science, Investigating in science, Material World
Keywords: 
changes, acids, carbonates, fair testing, variables, planning investigations
Description of task: 
Task: Identify which variables should be kept the same to compare reaction times. Assessment focus: control of variables.
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: 
    

Y9 (08/1997)

Y10 (08/1997)
a)
b)
c)
d)
e)		 Yes
Yes
No
Yes
No		 4-5 correct – moderate

2-3 correct – very easy

 4-­5 correct – easy

2-­3 correct – very easy