Chemistry

6. taking off what rises to the top of the container in water or another liquid
8. the positive part of an atom
9. separating chemicals of different colours
12. a type of secure tether which two atoms share with one or more other atoms
14. taking out magnetic things using a magnet
15. the negative part of an atom
16. a describing word for a substance which is made up of more than one element
17. a state of matter whose atoms are slow
19. a describing word for a non-uniform-looking mixture
21. something which has mass

1. the neutral part of an atom
2. smallest part of matter
3. heating liquid and keeping it, moving it to another container and keeping the solid
4. a state of matter whose atoms are so fast they have broken away from each other
5. blocking some things and throwing others away
7. a describing word for a substance which is made up of only one element
10. a describing word for a uniform-looking mixture
11. a result of two elements combining
13. the result of two atoms tethering together
18. a state of matter whose atoms are medium pace
20. heating liquid so the solid stays behind