| Light and atoms | Mixtures I | Mixtures II | Chemical changes I | Chemical changes II |
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
What is matter?
What is matter?
Matter is everything around us.
What are the main components of an atom?
What are the main components of an atom?
Electrons, protons and neutrons.
What is light?
What is light?
Light is a form of energy that travels in waves.
What is reflection?
What is reflection?
Reflection happens when light hits the surface of a solid or liquid matter.
What is electricity?
What is electricity?
It is a form of energy produced when electrons move from the orbit of one nucleus to another atom.
What is a mixture?
What is a mixture?
It is a substance made up of two or more types of matter that aren't chemically combined.
What is the difference between a homogeneous mixture and a heterogeneous mixture?
What is the difference between a homogeneous mixture and a heterogeneous mixture?
Iin a homogeneous mixture, the components can't be differentiated. In heterogeneous mixtures, the components can be differentiated.
What is a compound?
What is a compound?
It is a substance made up of two or more types of matter that are chemically combined.
What kind of mixture is a solution?
What kind of mixture is a solution?
It is a homogeneous mixture.
What are the components of a solution?
What are the components of a solution?
The liquid ones are called solvents. The other components are called solutes,
Name three techniques used to separate mixtures.
Name three techniques used to separate mixtures.
Filtration, distillation, dissolution, evaporation...
What is an insoluble substance?
What is an insoluble substance?
It is a substance that can't be joined with water.
If you want to separate sand from water, which method of separation should you use?
If you want to separate sand from water, which method of separation should you use?
Filtration.
Why do we use distillation to separate a mixture of alcohol and water?
Why do we use distillation to separate a mixture of alcohol and water?
Because water and alcohol have different boiling points. Alcohol evaporates faster than water.
Explain the process of dissolution.
Explain the process of dissolution.
1. Add water to the mixture and mix it. 2. The soluble substance dissolves in the water. 3. Filter the mixture. 4. Evaporate the solution.
What is a chemical change?
What is a chemical change?
Two or more substances combine chemically to form a new substance. It is a non-reversible change.
What is an endothermic reaction?
What is an endothermic reaction?
It is a chemical reaction that requires thermal energy from matter around in order to happen.
Is combustion an endothermic reaction or an exothermic reaction?
Is combustion an endothermic reaction or an exothermic reaction?
It is an exothermic reaction.
Name the problems that combustion can cause.
Name the problems that combustion can cause.
Global warming, health problems, acid rain...
What is acid rain?
What is acid rain?
It is a mixture of rainwater and sulphur dioxide. It can cause health problems in people and animals, destroy forests and buildings.
What is oxidation?
What is oxidation?
It is a chemical reaction in which an atom loses one or more electrons to oxygen atoms.
Name three types of chemical changes.
Name three types of chemical changes.
Combustion, oxidation and fermentation.
Why do apples turn brown when they are cut?
Why do apples turn brown when they are cut?
Because they oxidise in the air.
This is yeast. How can we use it?
This is yeast. How can we use it?
We can use yeast to produce wine, cheese, bread...
What can we do to protect iron from becoming brittle?
What can we do to protect iron from becoming brittle?
We can paint it. Paint forms a barrier between the ion and the oxygen in air.
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