OK, you've finished the whole book now. In order to supplement (add to) the exercises at the end of each chapter, there is a big quiz you have to finish before getting to the end of this book so that you know how well you did. Older kids may want to use this to prepare for tests or exams. If your computer has flash player 8 or above, you should use the interactive version at this website. Are you ready? On your marks, get set, go!

Part 1: True or false?

Each question carries one mark only.

Part 2: Multiple-choice questions

Each question carries two marks.

1. Which of the following is not matter?
Choices Lava Dogs Carbon dioxide Sounds	Answer 4; see Introduction
2. Name the process in which water changes into gas at a fixed temperature.
Choices Condensation Evaporation Boiling Freezing	Answer 3; see Matter
3. Which of the following is incorrect according to the particle theory?
Choices Particles are infinitesimal, although some strong microscopes can see them. Different kinds of particles have different sizes. Particles are always moving. There are gaps between particles.	Answer 1; see Particle theory
4. Which of the following best describes the movement of pollen grains when hit by water particles?
Choices Diffusion Photosynthesis Brownian motion Distillation	Answer 3; see Brownian motion
5. Hi! If you put me in a box whose capacity is the same as my volume, I will fit nicely inside, but you cannot squash me. I am insoluble in water, and my density is a lot less than water. What could I be?
Choices Oxygen Mercury Antimony Oil	Answer 4; see Three states of matter
6. Hi! We are very good brothers. Once we come together, our total volume decreases. If some other particles come here, we welcome them happily, and let them spread evenly around us. What could we be?
Choices Mercury and Venus Alcohol and water Rubber and wood Water and oil	Answer 2; see Particle theory and Diffusion
7. In which state of matter can particles slide over one another but not move freely?
Choices Plasma Gases Solids Liquids	Answer 4; see Three states of matter.
8. Which of the following statements about air particles in a hot-air balloon is not true?
Choices They are spaced further apart than the particles outside. They float because they are more dense than the air outside. They are so small that microscopes cannot see them. They move more vigorously because they are heated by an engine.	Answer 2; see Float or sink?.
9. Given that the particles are gaseous and are enclosed in the boundaries of the diagram, what will the red particles do and why?	Diagram
Choices They will settle on the bottom of their container because of gravity. They will remain stationary because they are too dense. They will move in random directions because of Brownian motion. They will spread evenly in the box because of diffusion.	Answer 4; see Diffusion
10. Which of the following inventions is related to thermal expansion?
Choices The submarine The thermostat The suction cup The hot-air balloon	Answer 2; see Expand or contract?

How did you do?

If you got over 80% of the answers, congratulations! You are now familiar with the science of particles. If you got under 50%, you'd better read through the book again to ensure that your understanding of particles is good. Before you put down this book, we will look through the main points again. If you forgot about some of the things, you can always look at the summary again. This will save you a lot of time.