MTBS – iGCSE Chemistry States of Matter/Diffusion/Separating Paper 1 & 2
18 test answers
Unlock all answers in this set
Unlock answers 18question
Changing state - describe boiling (oppoisite of condensing)
answer
- Liquid heated, particles move more - Particles have enough energy to overcome the forces of attraction between partilces - Liquid turns into a gas
Unlock the answer
question
What is the difference between boiling and evaporating
answer
- Boiling requires heating. - Evaporation happens at any temperature. (Puddles evaporate)
Unlock the answer
question
Sublimation
answer
Solid changes directly into a gas
Unlock the answer
question
What happens if a solid piece of potassium permangenate is placed into a beaker of water
answer
- Purple colour from the pottasium permangenate spreads ot over time - Potassium permangenate diffuses
Unlock the answer
question
What happens when ammonia and Hydrogen chloride are put in a tube at opposite ends
answer
-Both gases spread out through the tube (diffusion) -Where they react a white solid Ammonium chloride forms - Ammonia (NH₃) diffuses faster than the Hydrogen chloride (HCl) because it is a smaller molecule. - The white solid appears nearer the Hydrogen Chloride end
Unlock the answer
question
What is the symbol equation for Hydrogen chloride reacting with ammonia
answer
NH₃(g) + HCl(g) ⇌NH₄Cl(s)
Unlock the answer
question
What happens when Bromine Liquid is put into a tube
answer
- The orange brown gas spreads out throughout the tube. - The bromine gas diffuses through the tube
Unlock the answer
question
What sort of reaction is Hydrogen chloride reacting with ammonia
answer
- A neutralisation reaction (It is also reversible)
Unlock the answer
question
How could you separate a solid from a liquid
answer
Filtration Using filter paper to catch the solid
Unlock the answer
question
How could you separate a soluble salt from water
answer
crystallisation Heat the solution - increases the concentraiton of the solution Leave to slowly evaporate and crystallise Dry the crystals in air or a warm oven
Unlock the answer
question
What two ways could you use to separate a mixture of two liquids.
answer
- Chromatography - identifies the substances - Distillation - collects the liquids (fractional distillation for crude oil)
Unlock the answer
question
Describe how you would undertake chromatography
answer
Draw a pencil line near the bottom (pen would spread) Spot mixture onto line Place into solvent - solvent below the pencil line Cover the container Leave to separate
Unlock the answer
question
Describe how you would undertake distillation
answer
Heat the solution One of the substances evaporates It cools and condenses and collected
Unlock the answer
question
A - compound B - Element C - Mixture of compound and element D - Mixture of elements
answer
Element mixture or compound
Unlock the answer
