class 8 set A

1. Point the temperature at which a liquid changes to a gas.
3. a constant flow of electrons through a conductor.
5. the amount of matter in an object.
6. the temperature at which a liquid changes to a solid.
9. the path along which electrons (electricity) flow.
10. a mixture in which two substances are evenly mixed and cannot be easily separated.
11. rapid back and forth movement of matter that produces sound.
13. a material that allow the flow of energy.
15. heat energy.
18. matter that has a definite volume but takes the shape of its container.
21. a form that matter can take----solid, liquid, or gas.
24. the process by which a liquid changes into a gas.
25. to form a solution with another substance.
26. anything that has mass and takes up space.
28. the bouncing of light (or sound) off objects.

2. a material that stops or slows the flow of energy.
4. the process by which a gas changes into a liquid.
5. a combination of two or more different kinds of matter, each of which keeps its own physical properties.
7. a form of energy that is produced when electrons move from one place to another.
8. a force that acts against motion when two surfaces rub against each other.
10. the movement of energy caused by vibrations.
12. energy an object has because of its motion or position.
14. a force that pulls magnetic materials across a distance.
16. the density of an object relative to that of water: objects having a relative density less than water will float; objects having a relative density greater than water will sink.
17. the bending of light rays when they pass from one substance into a different substance.
19. matter with no definite shape or volume.
20. the temperature at which a solid changes to a liquid.
22. a force that pulls all objects in the universe toward one another.
23. push or pull on an object---can cause an object to move, change direction, or stop moving.
27. matter that has a definite shape and volume.