Chemistry Key Terms

2. The change in the state from gas to solid is called ______.
8. The state of matter which moves in random or Brownian motion.
11. The process of change of state from liquid to gas over a range of temperatures.
13. The melting point and ________ point of any substance are both the same temperature.
14. Every substance around us is made up of incredibly small particles known as _____.
15. The process of conversion of solid to liquid.
17. A substance formed by the chemical combination of two or more elements in fixed proportions.
18. Electrons are present in energy levels or electron ______.
20. An uncharged subatomic particle.

1. ______ have a fixed volume but no definite shape.
3. A substance that cannot be further divided into simpler substances by chemical methods.
4. The direct change of state from solid to gas.
5. The _______ point increases in an impure substance.
6. Anything that occupies space, has mass and can be perceived by our senses is known as ______.
7. Atoms with same proton number but a different atomic mass.
9. The movement of particles from higher concentration to lower concentration.
10. This state of matter has the highest intermolecular forces.
12. The central region of an atom made up of protons and neutrons.
16. A subatomic particle with negligible mass.
19. A positively charged subatomic particle.