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Across 3. the mass of a mole of an element 6. two elements form more than one compound 7. small whole numbers that are placed in front of the formulas in an equation 10. ratio of the actual yield to the theoretical yield expressed as a percent 12. representation of a chemical reaction 14. 6.02 x 10^23 15. two elements and can be either ionic or molecular 17. each side of the equation has the same number of atoms of each elements and mass 18. states that equal volumes of gases that contain equal numbers of particles 19. substance that speeds up the reaction but is not used up in the reation 20. composed of more than one atom

Down 1. states that in samples of any chemical compound 2. volume occupied by 1 mole of a gas at standard temperature and pressure 4. representative particles in a mole 5. conversion factor derived from the coefficients of a balanced chemical equation 8. single atom with a positive or negative charge 9. chemical equation that does not indicate the relative amounts of reactants and products 11. percent by mass of each element in the compound 13. contains one or more hydrogen atoms and products hydrogen ions 16. ionic compound that produces hydroxide ions when dissolved in water