Across
- 2. a distinctive smell, especially an unpleasant one.
- 3. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
- 5. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.
- 7. (of a reaction or process) accompanied by the release of heat.
- 8. relating to things perceived through the senses as opposed to the mind; tangible or concrete.
- 9. a reaction in which a compound breaks down into two or more simpler substances.
Down
- 1. (of a reaction or process) accompanied by or requiring the absorption of heat.
- 4. the joining together of two reactants, or compounds, to produce a complex product, also called a compound.
- 6. a compound or substance that has been purified or prepared, especially artificially.
- 8. cause (a substance) to be deposited in solid form from a solution.