Chemistry Jigsaw Puzzle

3. The chemical _________ tells us the types of atoms and the number of each type of atom in one molecule of substance.
5. Atoms are neither _________ nor created during a chemical reaction.
7. In general, a dilute acid reacts with a _________ to produce a salt, carbon dioxide and water.
9. An electron has _________ mass compared to protons and neutrons.
10. A liquid has a fixed _________ but does not have a fixed shape.
12. Chemical changes are permanent and _________.
14. When a matter is heated and its particles gain enough energy, the matter goes through _________.
17. An _________ is a substance which changes colour depending on whether the solution being tested is acidic or alkaline.
19. Among the sub-atomic particles, _________ contribute most to the mass of an atom.

1. A molecule of a _________ consists of a fixed number of different types of atoms chemically combined.
2. A _________is made up of two or more atoms chemically combined.
4. Gases have no definite shape or volume. Thus, gases can be _________.
6. _________ is the amount of matter packed into a unit volume.
8. Common indicators include red and blue _________ papers, and Universal Indicator.
9. When alkalis react with acids, a chemical reaction called _________ occurs.
11. _________ is the chemical decomposition of substances with the passage of an electric current.
13. An atom contains an equal number of protons and _________.
15. The particulate nature of matter is a model that describes matter as being made up of tiny _________ that are constantly moving in a random manner.
16. The proton number is also known as _________ number.
18. When matter expands, the _________ between particles increases and the amount of particles remain the same.