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Name the method used to separate sand from water.
Filtration
Name the method used to separate the different colours in black ink.
Chromatography
Name the technique that uses a high-speed spinner to separate mixtures.
Centrifugation
This is the name for the variable that a scientist measures in an experiment.
Dependant Variable (DV)
This method is used to get copper sulphate crystals back from a light blue copper sulphate solution.
Evaporation
In chromatography, what phase is the filter paper which the ink travels up through referred to?
The Stationary phase
What do we call an educated guess or prediction in a scientific report?
Hypothesis
Using a very precise digital thermometer to measure temperature improves the [...] of the experiment
accuracy
This property describes whether a solid can dissolve in a liquid.
Solubility
This technique involves boiling a liquid and then cooling the vapour to collect the pure liquid.
Distillation
Centrifugation separates parts of a mixture based on this property.
Density
In the aim "To investigate the effect of temperature on how fast sugar dissolves," what is the independent variable?
Temperature
What property of sugar stops it from being separated from water by filtration?
It is soluble (its ability to dissolve in water)
Distillation is able to separate two liquids because they have different... what?
Boiling points
What is the most important safety rule when loading tubes into a centrifuge?
You must balance the tubes with each facing opposite sides.
Give one major reason why the hypothesis "I think plants will grow" is a weak scientific hypothesis.
It is not specific and uses first person.
To separate a mixture of tiny pieces of wood and copper sulphate, you add water first. What are the next two separation steps, in order?
Filtration, then evaporation.
If a single ink dot separates into three different colours during chromatography, what does this prove about the ink?
The ink is a mixture (not a pure substance).
Why is centrifugation much faster than simply letting a mixture like muddy water settle on its own?
The spinning force is much stronger than gravity.
If you test different fertilisers on plants but give each plant a different amount of water, your experiment is no longer what?
No longer valid