# Benchmark Review / Unit 4

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 Author: GRIZELLE ID: 175666 Filename: Benchmark Review / Unit 4 Updated: 2012-10-05 08:33:01 Tags: Science Folders: Description: Science/ Unit 4 Show Answers:

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1. B.
2. F. same mass
3. B. Liquid WaterÂ  ->> Boils ->> Water Vapor
4. I. Adding heat causes a chemical change in the particles of the egg that makes it solid.
5. A.
6. G. As the metal lid was heated, it expanded so that it was not as tight.
7. A.Chemical changes generally happen faster at higher temperatures.
8. F. All matter is made up of atoms.
9. D. Graph D
10. F. raw sugar, cold water
11. C. Cool the solution
12. F. Sugar
13. D. By letting the oil float to the top and skimming it off
14. F. Use a magnet
15. C. 2: solid
16. G. Energy of water particles decreases in steps 1 and 2.
17. A. It has its own shape.
18. H. The particles in a liquid are much closer together than the particles in a gas.
19. B. Divide the mass by the volume.
20. I. The atoms in the can are different from the atoms in the wire.
21. What is matter?
It is something that has mass and it has volume.
22. What is volume?
It is the amount of space something takes up.
23. What is temperature?
It is a measure of energy of motion of the particles in matter.
24. Where is density found?
Every substance has its own density.
25. How do you calculate density?
You divide the mass of an object by its volume.
26. How can you measure mass?
Mass can be measured by using a balance.
27. What is a liquid?
It is a substance that has a definite volume but does not have a definite shape.

The particles in a liquid move slower than the particles in a gas, and they slide by each other.
28. What is a gas?
It is a substance that does not have a definite shape or volume.

The particles in a gas move very quickly and are far apart from each other.
29. What is a solid?
It is a substance with a definite shape and volume.

The particles in a solid are very close to each other. They don't move from place to place. They just vibrate where they are.
30. What is a physical change?
A change in which the form or shape of a substance changes but the substance still has the same chemical makeup.
31. What is a chemical change?
A change in one or more substances, caused by a reaction, that forms new and different substances.
32. What is a reaction?
The process in which new substances are formed during a chemical change.
33. What is a mixture?
It is a combination of two or more substances that keep their identities.

The parts of a mixture don't undergo a chamical change.

Making a micture is a physical change.
34. What is a solution?
It is a mixture that has the same composition throughout.
35. What is an atom?
Is is the smallest unit of an element that maintains the properties of that element.
36. What is the atomic theory?
Is is a scientific explanation of the structure of atoms and how they interact with other atoms.
37. What is an element?
It is the type of matter made of just one kind of atom.

All atoms have the same number of protons.
38. What is a compound?
It is a substance formed by at least two types of atoms thta are chemically combined.
39. What is a proton?
It is a positively charged particle found in the nucleus of an atom.
40. What is a neutron?
Neutrons are particles found in the nucleus, but a neutron has no charge.
41. What is an electron?
Electrons are negatively charged particles that speed through an area around the nucleus called the electron cloud.
42. Which are protons, the neutrons and the electrons?
43. What did Democritus state?
All matter is made of tiny, solid balls called atoms.

The word atom means "indivisible."

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