unit 3 Vocabulary

2. Number the number of particles in 1 mole (or mol) of a substance.
4. composition tells you by mass what percent of each element is present in a compound.
7. reaction a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
8. reaction the processes by which chemicals interact to form new chemicals with different compositions
13. formula a chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.
14. equation the symbolic representation of a chemical reaction in the form of symbols and formula
15. of Conservation of Matter The amount of matter stays the same, even when matter changes form.
16. mass the mass of one mole of any substance.
18. the number that you multiply a variable by
19. a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid.
20. replacement reaction a reaction in which one element is substituted for another element in a compound.

1. any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight.
3. reaction a chemical process in which two or more simple elements or compounds combine to form a more complex product.
5. any item or service you sell to serve a customer's need or want.
6. replacement reaction when parts of two ionic compounds are exchanged, making two new compounds.
9. formula a formula giving the number of atoms of each of the elements present in one molecule of a specific compound.
10. reaction a reaction in which a compound breaks down into two or more simpler substances.
11. ratio the ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction.
12. The substances which participate in a chemical reaction
17. a unit of measurement that is the amount of a pure substance containing the same number of chemical units