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Particles, Mixtures and Solutions
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Particles, Mixtures and Solutions
Part 1: Particle Theory
Choose the best answer for each question.
1. Which statement is part of the particle theory of matter?
Matter is made of tiny particles.
Particles only exist in solids.
Particles cannot move.
All particles are the same size.
2. How are the particles arranged in a solid?
Far apart and moving freely
Close together in fixed positions
Close together but spreading out quickly
Not moving at all
3. What happens to particles when a substance is heated?
They usually move faster.
They disappear.
They become a different element.
They stop moving.
4. Which state of matter has a fixed volume but takes the shape of its container?
Solid
Liquid
Gas
Plasma
Part 2: Mixtures and Solutions
5. Select all the mixtures from the list below.
Air
Pure gold
Fruit salad
Salt water
6. Complete the sentences using the words solute, solvent and solution.
In salt water, salt is the ____________, water is the ____________, and the mixture formed is a ____________.
7. Match each term with its description.
A. Solute
B. Solvent
C. Mixture
_____ A substance that dissolves another substance
_____ Two or more substances together
_____ A substance that is dissolved
Part 3: Explain and Apply
8. Explain why a gas can be compressed more easily than a solid.
9. Describe one way to separate sand from water. Explain why this method works.
10. A student stirs sugar into warm water until it disappears. Is this a chemical reaction or a physical change? Give a reason for your answer.
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