Chemistry IGCSE Revision (Double Award)
EXAM QUESTIONS AND ANSWERS 100%
SOLVED (Newest 2025) What are the characteristics of solids? - Correct Answers ✅1. strong forces
- fixed positions
- definite shape and volume
- particles vibrate in fixed position
- when heated they expand slightly
- definite volume but NOT definite shape
- they have constant movement with a random motion
- when heated they expand slightly
- no definite volume or shape
- they have a constant and random movement
- when heated their pressure increases
What are the characteristics of liquids? - Correct Answers ✅1. weak forces of attraction means they are free to move
What are the characteristics of gases? - Correct Answers ✅1. very weak forces of attraction
What happens when a solid becomes a liquid and how is this called? - Correct Answers ✅The particles have more energy when they are heated. The solid expands and as the forces of attraction become weaker some particles become free. This is called MELTING 1 / 4
Chemistry IGCSE Revision (Double Award)
EXAM QUESTIONS AND ANSWERS 100%
SOLVED (Newest 2025) What happens when a liquid becomes a solid and how is this called? - Correct Answers ✅The energy is slower, so the particles move less and less. As a result, the forces become stringer. This is called FREEZING.What happens when a liquid becomes a gas and how is this called? - Correct Answers ✅The liquid is heated, and the kinetic energy of the particles increases. As a result, the particles move faster and the bonds break. This is called
EVAPORATION.
What happens when a gas becomes a liquid and how is this called? - Correct Answers ✅The kinetic energy of the particles decreases. As a result, the bonds between the particles start becoming stronger. This is called
CONDENSATION.
What do we call it when a solid becomes a gas? How does it happen? - Correct Answers ✅This is called SUBLIMATION.The particles move so fast that the bonds are broken completely.What is diffusion? - Correct Answers ✅Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration against a concentration gradient. 2 / 4
Chemistry IGCSE Revision (Double Award)
EXAM QUESTIONS AND ANSWERS 100%
SOLVED (Newest 2025) Describe the experiment used to show the dilution of colors. - Correct Answers ✅1. You use Potassium Manganate (VII) as it has a bright purple color.
- You place the Potassiu Manganate in a beaker filled with
- Because of the particle movement in the water particles,
- The purple solution with have spread evenly throughout.
- To dilute the solution, just add some more water. The
- Hydrochloric acid=> gives off hydrogen chloride gas.
- a white ring will be formed, which is Ammomium Chloride,
water.
the Patassium Manganate will eventually diffuse to the whole beaker.
Potasium Manganate wil diffurse even more, which will give it a lighter purple color than it was before.Describe the two diffusion tests. - Correct Answers ✅1.Ammonia and Hydrogen Chloride.-You take aqueous NH3 => gives off Ammonium gas.
-soak two cotton wools with HCl and NH3 and place them in tube in opposite sides.
nearer to the HCl (the reason for this is because the particles of Ammonia are smaller and lighter than the particles of HCl => diffuse through air quicker. 3 / 4
Chemistry IGCSE Revision (Double Award)
EXAM QUESTIONS AND ANSWERS 100%
SOLVED (Newest 2025)
- Bromine Gas and Air
- Bromine gas is brown
- when the plate is taken away, the whole tube will have
- / 4
-fill half a jar with bromine gas and the other half will have oxygen.-you place a a glass plate to separate the bromine with air.
become brown as the bromine gas has diffused inside the tube.What is meant by an atom? - Correct Answers ✅An atom is the smallest particle of an element that can take part in a chemical reaction.What is meant by a molecule? - Correct Answers ✅A molecule is the smallest particle of a substance that can have a separate, independent existence.What is an element? - Correct Answers ✅An element is a substance made up of atoms that all contain the same number of protons.What is a compound? - Correct Answers ✅A compound is a substance made up of two or more elements chemically combined together.