Mole and Chemical Reactions Crossword

2. The simplest whole-number ratio of elements in a compound.
4. A substance that is formed as a result of a chemical reaction.
7. The reactant that is used up first in a chemical reaction, limiting the amount of product that can form.
9. A scientific law stating that matter cannot be created or destroyed in a chemical reaction, so the total mass of reactants equals the total mass of products.
10. A small number written below and to the right of an element in a chemical formula, showing how many atoms of that element are in one molecule of the compound.
11. The mass of one mole of a substance, usually measured in grams per mole (g/mol). It is calculated by adding up the atomic masses of all the atoms in a molecule.
13. A process where substances, called reactants, change to form new substances, called products.

1. A chemical equation in which the number of atoms for each element is the same on both sides of the equation, following the law of conservation of mass.
3. The percentage by mass of each element in a compound.
5. A substance that starts a chemical reaction and is used up during the reaction.
6. The reactant that is left over after the limiting reactant is completely used up in a chemical reaction.
8. The number of particles in one mole, which is 6.022 × 10²³.
11. The actual number of atoms of each element in a molecule of a compound.
12. A unit used to measure the amount of a substance. One mole contains 6.022 × 10²³ particles (atoms, molecules, or ions) of that substance.