Across
- 4. In a system closed to matter transfer, the amount of mass of that system remains constant over time. (The mass of the reactants must equal the mass of the products.)
- 8. Using coefficients to make the number of each type of atom in the reactants equal to the number of each type of atom in the products.
- 9. The mass of 1 mole of a substance. Found by expressing the atomic or formula masses in grams.
- 10. A starting substance in a chemical reaction, appearing before the arrow in a chemical equation.
- 11. Numbers used in a chemical equation to indicate the number of atoms or molecules. Determined during balancing, they are written in front of the atomic symbol or chemical formula.
- 12. The mass of one atom of an element in atomic mass units (amu).
Down
- 1. A new substance formed in a chemical reaction, appearing after the arrow in a chemical equation.
- 2. The number of things in 1 mole -- 6.02 x 1023.
- 3. The sum of the atomic masses in a chemical formula in atomic mass units (amu).
- 4. There is usually only one correct ratio for the combination of elements in a compound.
- 5. The process of using the balanced chemical equation to predict the amounts (masses) of some substance in the chemical reaction.
- 6. A representation of the the submicroscopic rearrangement (new bonding) of atoms.
- 7. Numbers that denote the ratios between elements in a chemical formula. Determined by electrons/charges (stability or low energy), they are written below the line and after the atomic symbol.