6: VALID Sample Test Review
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What are the three types of variables that you need to consider for an experiment
The independent, dependant and controlled variable(s)
What is the independent variable and which axis do you plot it on
the variable you are changing, plot it on the x axis
What is the dependant variable and which axis do you plot it on
the variable that you are measuring, plot it on the y axis
What is a controlled variable
Things that need to be kept the same in an experiment
What is a control sample
A way of comparing the results to a situation with no change
what are 4 ways of separating compounds from a mixture
sorting by magnetism, particle size, insolubility and different boiling points
How would I sort out iron filings from a mixture of sand
Magnet them out
How would I sort out sand and salt from a mixture of sand, salt and water
Decant to get the sand out, boil the water and condense it via a distillation apparatus
What is a distillation apparatus
a combination of condensation tubes, a bunsen burner and a beaker that separates insoluble things via boiling point
What separation process do tea bags use
filtration
What separation process is used when sifting flour
Using a sieve (particle size but bigger)
What’s the difference between a sieve and filter paper
A sieve is like filter paper as it sorts via particle size, but filter paper does so at the molecular level
What is the difference between validity and reliabillity
Validity is a measure of how accurately you address the aim whereas reliability how consistent your findings are with multiple trials TLDR; validity = how well you address the aim, reliability = consistency
what is the name of the process when a liquid turns into a solid
Freezing
what is the name of the process when a liquid turns into a gas
evaporation
what is the name of the process when a solid turns into a gas
sublimation
what is the name of the process when a solid turns into a liquid
melting
what is the name of the process when a gas turns into a liquid
condensation
What are the three types of heat transfer
conduction, convection and radiation
In what kind of heat transfer do objects touch to transfer heat
conduction
In what kind of heat transfer does hot air rise above cold air
convection
In what kind of heat transfer does heat get transferred by electromagnetic waves (light energy)
radiation
What is the SI for force
Newtons
What is the SI for mass
kg