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Corrosion Design Practical Investigation

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Booleroo Centre District School – Year 10 Science
Corrosion Design Practical Investigation - Task Sheet
Background:
Metal corrosion, or oxidation, involves the transfer of electrons from the metal to
oxygen. The rate of metal corrosion is affected by such things as exposure to salt,
acid, base, and pollution. A metal can be protected from corrosion by being coated with paint, a rust inhibitor, or
any other film which prevents exposure of the metal to oxygen or moisture. Galvanizing is used to protect iron and
steel products from being corroded. Galvanization is the application of a thin coating of zinc to iron or steel.
Task description:
You will be required to design an investigation into the topic of corrosion. This could be about a specific factor that
influences the rate or degree of corrosion; or about a method to prevent corrosion.
Step 1 – Collect background information
You need to know something about the social importance of corrosion to provide a justification or reason for
designing the investigation. You also need to know something about the chemistry of corrosion to guide you in
selecting a factor to investigate; e.g what are the necessary conditions for rust to form? If you want to investigate
ways to prevent corrosion, then factors that promote corrosion can guide you to ways of reducing their effect; e.g.
what are common methods for rust prevention and how do they work?
Step 2 - Design the investigation
1. What is the aim of your experiment?
2. Do you have a testable hypothesis?
3. What is the independent variable that you will change and how will you change it?
4. What will be your dependent variable that you measure and how will you measure it? (qualitative)
5. What factors will you be sure to keep constant?
Step 3 - Write down how you are going to do the experiment.
1. List all materials you will require and their quantities.
2. Identify potential hazards and state the relevant precautions that need to be taken.
3. You need a step-by-step procedure/method. Don’t forget to include replication, and the way you are
going to measure your results. Draw labelled diagrams of your experimental set up and materials
needed.
Step 4 – Represent results
This section contains your raw data, preferably in a tabular form and any observations you may have
made. You may wish to collate and display your results as graphical representations. Describe (but don’t
explain) any patterns you observe in your results.
Step 5 – Discussion
Discuss the reaction involved in the formation of rust. What type of reaction is this? Explain your results
and discuss how your independent variable effected the rate of the reaction. Make sure your data
supports your interpretations. You should use information gathered from your initial research
(validation).
You should refer to random and systematic errors and how they would affect your data (increase or
decrease values) if present.
You should suggest improvements or changes to your design. If so, make sure you explain why and how
it would affect your original idea.
Step 6 – Conclusion and reference list
This section is only a couple of sentences long and addresses your aim/hypothesis. It should also link back
to the real-world applications of your experiment.
Corrosion Investigation Success Criteria
Prac Design
Introduction
Prac Design
Prac skills
Method
Results
Discussion
and
Conclusion
What needs to be included:
Explanation of the formation of
rust with reference to a
chemical equation. Description
of how different factors can
affect the rate of a chemical
reaction.
Clear aim, Hypothesis stated,
Materials List, safety
assessment, and Step-by-Step
Procedure written.
Preparedness on experimental
set-up day. Efficiency of
setting up equipment,
organisation of time, splitting
tasks evenly between partners.
Safe Lab practices.
Your method must be written in past
tense because you have already done
the experiment. Write in enough
detail for someone to be able to
repeat the experiment exactly how
you performed it. Include the number
of replicates.
Make it clear how the constant
factors were kept constant.
Include labelled diagrams of
apparatus set up.
Observations recorded. The columns
and rows of tables should have
appropriate headings. All data should
have units with the correct symbols
included.
If a graph is used the
appropriate graph for the type
of data should be chosen (Line
graph if the independent
variable is continuous or a
column graph if the order on
the X axis does not matter).
Interpret and analyse your results (ie
explain what the results mean).
Explain how your results fit in with
current knowledge about rust
protection and prevention.
Describe a range of random and
systematic errors and how they could
have impacted on the results.
Describe what you would change if
had to test the same hypothesis again
and why you would need to make
those changes.
Conclusion - did your results support
your hypothesis? Why or why not?
Describe how you could use the
results of your experiment in your
everyday life.
Name: ________________________________________
C
A
B
D
E
Accurate and
detailed
description
Detailed
description
General
description
with few
details
missing
General
outline only
Very limited
detail
Logical,
detailed and
effective
Detailed
and
effective
General with
a few
sections
missing
Outline only
Very little
detail
Excellent
preparation
and
organisation
Good
preparation
and
organisation
Adequate
preparation
and
organisation
Some
preparation
and
organisation
Insufficient
preparation
and
organisation
Logical,
detailed and
effective
Detailed
and
effective
General with
a few
sections
missing
Outline only
Very little
detail
Accurate and
highly
effective
Accurate
and mostly
effective.
Some errors
but
generally
accurate and
effective.
Conventions
used
inconsistently
occasional
accuracy and
effective.
Attempted
but with
limited
accuracy and
effectiveness.
Logical
evaluation
and analysis
and range of
improvements
Evaluation
and analysis
done with
consistent
conclusions.
Some
evaluation
and analysis
with a
conclusion.
Some
connections
and simple
conclusion.
Basic
connections
and some
meaning
made.
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