Yr 7 Science - Term 1, 2014
Separating Mixtures Assessment Task
Student Name:
Start Date: Week 5
Homeform:
Teacher: WEXP
Draft Date: Week 6
CARC
JAMM
JAQR
Due Date: Week 8
Context
Conditions
You are a chemist employed at Cairns Water and you have been
asked to separate out the mixtures in some contaminated water.
Your job is to use the different methods that you have used in class to
separate the substances from the water. You then need to write a
scientific report about your experiment.
Individual task; group prac work; work in class and also work in
own time.
Task Description
1.
2.
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6.
You will work as a group to plan and conduct the experiment
In the table provided in this task sheet, write the weight of the substances before you do the separation. After the separation, weigh the
substances again and write it in the same table.
Write your own prac report on the separation process that includes the aim, materials, procedure, results and discussion.
Present all data sheets for recording results (your table and graph)
Explain all changes in the amounts retrieved compared to what you started with.
Evaluate the procedure you used and make suggestions on how to improve the yield (that is the amount that you separated).
Submit this assignment booklet as your handwritten good copy.
Key Terms
Language to Use
record: put something down in writing.
Sentence Starters / Ideas:
Some of the data was inaccurate because …
This allowed/enabled …
It is likely that … because …
It means that …
It can be concluded that …
explain: make the reader understand something by giving
reasons for both ‘how’ & ‘why’ things are as they are.
evaluate: to give a considered judgement about the value
or worth of something or someone, and support it with
evidence.
Connectives:
…although….
because….
In common….
often….
As a consequence,…..similar to/different from
…shows…
…..supports…
Mostly….. since
As a result,……
Student Declaration
Resources
This task is my own original work and no part Mixture of 5 g of Salt, 20 g of sand, 15 g gravel, 5g of iron
has been copied from any other persons work filings and 0.5g plastic pieces.
or from any other sources except where
Magnets
50ml water
acknowledgement has been made.
Student Signature:
_______________________________________
Date: _______________________
Strainers/sieve
250ml beakers
Filter paper and funnels
Pieces of paper for
weighing solids
Conical flask
Stirring rod
Spatula
50 ml Measuring cylinder
Gauze mats, Tripods, Bunsen burners, heat mat
On the front bench you will find an electronic balance
YEAR 7 SCIENCE CRITERIA SHEET
Student name: _______________________
CRITERIA
Science Inquiry
Skills
Mixtures, including
solutions, contain a
combination of
pure substances that
can be separated using
a range of
techniques (ACSSU113)
A
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Formulation of questions and
justifiable predictions.
Comprehensive method in
steps, 3rd person past tense
including safety
considerations.
Correct order of techniques
conducted and justified.
Well constructed and accurate
results table and graph
including title, labels and units
Data analysed to draw well
reasoned conclusions
evaluating the effectiveness of
each separation technique.
Insightful reflection of
improvements made to the
method.
Clear and accurate
communication using
scientific language and
representations
B
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Formulation of appropriate
questions and predictions.
Clear method in steps and
past tense including safety
considerations.
Correct order of techniques
conducted.
Well constructed results table
and graph including title,
labels and units
Data analysed to draw
reasoned conclusions
evaluating the effectiveness of
each separation technique.
Reflection of improvements
made to the method.
Accurate communication
using scientific language and
representations.
C
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Formulation of feasible
questions and predictions.
Description of the method in
steps, including some safety
considerations.
Partly correct order of
techniques conducted.
Results table and graph
including title, labels or units
Explanation of data to draw
conclusions of the
effectiveness of each
separation technique.
Description of improvements
made to the method.
Communication using
scientific language and
representations
FEEDBACK:
Signature:
Date:
D
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Identified questions or
predictions.
Method listed.
Techniques conducted in
incorrect order.
Results table or graph
included.
Explanation of data.
Few suggestions for
improvements to the method.
Disjointed communication
using scientific language and
representations.
E
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Identified irrelevant questions
Attempt at a method.
Attempt at a results table or
graph.
Attempt at explanation of
data.
Suggestions for improvement
to the method are irrelevant.
Unclear communication using
scientific language and
representations.
Before any separation process is started,
your group must consult the teacher for a safety inspection
Title:
Aim: (Individual) Explain what are you attempting to do?
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Prediction: (Individual) Will you get all of each substance back? Predict the substances that you may not.
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Order for Experiments (Group):
Write a list of the experiments that you will conduct in the order that you will do them in. Justify why you will
conduct them in that order.
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Method: (Group) You need to write a full description of the procedure in steps. Make sure you include all
the steps that you should take to separate the mixture; (Remember, that someone else should be able to
repeat your experiment and get a similar result)
Experiment 1: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Experiment 2: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Experiment 3: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Experiment 4: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Experiment 5: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Experiment 6: __________________(Target Substance)
Separation technique? _________________________
Explain the property this substance has that suits this method of separation.
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Materials:
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Method:
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Results:
Substance
Exact dry weight (g)
(Starting)
Beaker weight: ________________
Exact Dry weight (g)
(Final )
Percentage
Recovered%
(Final ÷ Starting) x 100
Filter paper weight: ______________________
Graph : (Individual) Draw and label a bar graph displaying the percentage recovered. (Remember title and
axis labels)
Discussion: (Individual)
1. Explain why there were losses or gains for each substance, linking the information to your graph (Use
the numbers from your graph).
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2. Explain how would you improve the methods you used, so you can recover more of each substance if
you did the experiment again?
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3. Would you change the order of separation techniques? If so, how?
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Conclusion: (Individual)
4. In conclusion explain if this was an effective method of separating the mixture.
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