Across
- 2. Solid formed from liquid reactants during a chemical reaction
- 3. a number placed in front of a chemical formula in an equation
- 5. substance that undergoes a chemical change
- 6. compounds break down into simpler products
- 8. the new substance formed from a chemical change
- 10. matter doesn’t enter or leave
- 12. matter can enter or escape the surroundings
- 13. 1 element replaces another element in a compound
- 16. reaction in which energy is absorbed
- 17. way to show a chemical reaction, using symbols instead of words
- 18. any change that alters the form or appearance of a substance but does not create a new substance
- 19. minimum amount of energy need to start a chemical reaction
- 20. increases the reaction rate by lowering the activation energy needed
Down
- 1. a change in matter that produces one or more substances
- 4. material used to decrease the rate of a chemical reaction
- 7. reaction that releases energy in the form of heat
- 9. during a chemical reaction, matter is neither created or destroyed
- 11. 2 or more elements or compounds combine to make a more complex substance
- 14. help reactions occur at body temperature
- 15. the amount of substance in a given volume