Across
- 4. a compound breaks down into 2 or more simpler substances.
- 6. a process in which the substances exposure to each other increases
- 7. a reaction where forming bonds releases energy to the surroundings.
- 10. a substance reacts rapidly with oxygen.
- 11. Numbers that appear before a formula to show the relative proportions of each reactant and products.
- 14. Mass is neither created nor destroyed during a chemical reaction.
- 15. two different compounds exchange positive ions and form two new compounds.
- 16. substance that increases the reaction rate without being used up in the reaction.
- 17. the number of particles in a given volume of solution is called this
- 18. a reaction where breaking bonds requires energy and it absorbs energy from the surroundings.
Down
- 1. The new substance formed as a result of a change.
- 2. faster molecular motion causes rate of reaction to increase
- 3. The mass of the products if always equal to the mass of the reactants.
- 5. total energy before a reaction equals the total energy after a reaction.
- 8. the amount of surface available on a substance by crushing it or breaking it
- 9. two or more substances react to form a single substance.
- 10. Representation of a chemical reaction in which the reactants and products are expressed as formulas.
- 12. one element takes the place of another in a compound.
- 13. The substances that undergo change.