Chemistry Unit 4

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Across
  1. 3. the mass of one mole of a substance
  2. 8. lowest whole number ratio of the atoms of the elements in a compound
  3. 11. the molar mass of a substance is expressed in... per mol
  4. 12. we use molar mass to convert between mass and... of a substance
  5. 13. the chemical reaction in which two or more substances react to form one new substance
  6. 14. atoms, molecules, or formula units
  7. 15. we use... to convert between moles and volume of a gas at STP
Down
  1. 1. tells the actual number of each kind of atom present in a molecule of the compound
  2. 2. avogadro's... assumes equal volumes of gases at the same temp. and pressure contain equal numbers of particles
  3. 4. ... replacement is the chemical reaction in which there is an exchange of positive ions between two compounds
  4. 5. the arrow in a chemical reaction that separates reactants and products
  5. 6. the chemical reaction in which one compound breaks down into two or more simpler products
  6. 7. percent by mass of each element in a compound
  7. 9. in a chemical reaction, one or more... change into one or more products
  8. 10. ... gas is always a reactant in a combustion reaction