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13 Cards in this Set
- Front
- Back
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What are reliable results?
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results that come from experiments that give the same data.
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What makes it reliable?
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Can be repeated by you or reproduced by other scientists.
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What are valid results?
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Are reliable and come from experiments that were designed to be a fair test
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What is a variable?
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Something that has the potential to change (e.g. temp)
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What do you usually do in a lab experiment?
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Change one variable and see how it affects another. e.g. you have an experiment to where you are trying to see if the colour of a beaker affects heat loss.
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What do you do to make it a fair test?
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anything, other than beaker colour, must stay the same else it will affect the results (e.g. in beaker example the initial temp of water must be consistent or don't know if colour or not)
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What type of variable is the variable you can change?
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The independent variable (surface colour of beaker)
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What is the variable that you measure?
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The dependant variable (water temp)
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What variables must you keep the same?
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The control variables (e.g. init water temp, volume of water, beaker material etc.)
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What is a control experiment?
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An experiment that's kept under the same conditions but doesn't have anything changed at all. This allows you to see if there are any other factors that might be affecting results.
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How can you improve reliability?
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Carry out repeat experiments. Measure/ record and use average
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How many times should you repeat ideally?
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At least three times
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Give example of how you can control variables in an experiment
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if heat radiation, then affected by surface area, volume of water and initial temp so need to keep these constant.
You'd control them by using same beaker (surface area), measure volume of water, measure water temp |
