Across
- 4. An element takes the place of a element in a compound.
- 5. substance resulting from a chemical reaction
- 6. type of reaction that releases thermal energy into the environment in the form of thermal of light energy
- 8. Reactants combine to make a compound
- 9. Hydrogen or a Hydrocarbon burn in Oxygen to produce water, energy, and often CO2
Down
- 1. electrons located in the outer energy level
- 2. type of reaction that absorbs thermal energy from the environment
- 3. Elements in two compounds switch places
- 7. substance that are combined and changed during a chemical reaction