Variables
What is the independent variable?
The factor that is changed in an experiment.
Which technique uses filter paper?
Filtration
Which separation technique removes a solvent by heating?
Evaporation
What is an educated guess about what will happen in an experiment called?
A hypothesis
Diffusion moves particles from ______ concentration to ______ concentration.
High concentration to low concentration.
What is the dependent variable?
The factor that is measured or observed.
What is the solid left on filter paper called?
Residue
Which technique separates liquids based on different boiling points?
Distillation
What should changing only one variable help create?
A fair test.
Does diffusion happen faster or slower when particles move more quickly?
Faster
In the balloon size experiment, what is the independent variable?
Temperature of the water.
Which technique requires a magnet?
Magnetic separation
Which technique is commonly used to separate dyes in ink?
Chromatography
A student changes both water temperature and type of food dye. Why is this poor experimental design?
It is difficult to determine which variable caused the result
In the balloon investigation, what is measured?
In the Diffusion experiment, what is the dependent variable?
The time it takes for the dye to dissolve.
Which technique uses rapid spinning?
Centrifuging
What is the main difference between evaporation and distillation?
Evaporation loses the gas particles.
Distillation captures the gas particles as the condensate and collects the cooled liquid.
In the filtration experiment, what is the independent variable?
The type of filter used.
In the Diffusion experiment, what is changed.
Water temperature.
Why should controlled variables remain the same?
To ensure a fair test and make results reliable.
Which method would best separate iron filings from sand?
Magnetic separation
Which technique would allow you to obtain pure water from salt water?
Distillation
In the diffusion experiment, name two controlled variables.
Beaker, amount of water, food dye type, food dye amount.
In the filtration experiment, why should the same the same amount of sand and water be used throughout the experiment?
To keep this variable controlled and ensure valid results.