Across
- 4. the chemical present before a chemical reaction occurs
- 5. the chemicals present after a chemical reaction occurs
- 7. a reaction that releases heat to the surroundings
- 8. a reaction that absorbs heat from the surroundings
- 9. a shorthand that uses chemical symbols and molecular formulas to show what occurs during a chemical reaction
- 10. the addition of oxygen to a chemical substance
- 11. a natural law stating that the same amount of mass is present before and after a chemical reaction
Down
- 1. a type of chemical reaction that involves the combination of oxygen and fuel
- 2. a type of chemical reaction in which two or more substances combine and form one compound
- 3. a type of chemical reaction that involves one chemical compound that breaks into two or more separate compounds or elements
- 4. a type of chemical reaction that involves the exchange of ions in ionic compounds
- 6. the rearrangement of atoms by the breaking and reforming of chemical bonds