Paper1-SC1/SC2 Flashcards
What is fractional distillation?
When two or more liquids are separated(boiling points have to be different).
Can compounds be pure?
Yes.
What is a solution?
A mixture made of solutes(dissolved substances)in a liquid called the solvent.
Describe the equipment for distilation.
What is the residue?
The substance that is left behind in filtration.
Describe the equipment for filtration.
What is chemical analysis?
Using simple chemical reactions or sensitive machines to identify and measure the substance in a sample.
What is gas to solid called?
Deposition.
How can we make water pure?
Distilation.
Describe the equipment for simple distillation.
What is a saturated solution?
When as much of the substance can dissolve as possible.
Describe the equipment for crystalisation.
What is the composition of a pure substance?
Cannot be changed and is the same in all parts of a piece of substance. It cannot be separated into other substances using physical methods.
What is the Rf value?
The distance the compound has risen divided by the distance the solvent has risen. This does not change if the conditions.
What is the equation for Rf value?
What is a mixture?
Contains elements and/or compounds that are not chemically joined together. You can use physical methods to separate mixtures into different substances.
Is melting point a physical property?
Yes.
What is crystallisation?
Solutes can be separated from a solution by evaporating the solvent to leave the solutes behind. If the crystals form slower, the particles have longer to form the crystals will be larger.
What can chromatography be used for?
It can be used to find out which coloured compounds the mixture contains.
Describe the equipment for fractional distillation.
Describe the equipment for chromatography.
What is the positive of paper chromatography?
It is more simple as some compounds dissolve better in a solvent than others.
Explain the core practical on separating mixtures.
What is a hazard?
Something that could cause harm.
