unit 4: reactions

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Across
  1. 2. / a chemical reactions in which a substance reacts rapidly with oxygen, often producing heat and light.
  2. 5. / A change ( chemical) that requires or absorbs heat.
  3. 7. / A change (chemical reactions) that releases heat.
  4. 8. / A compound breaks down into 2 or more simpler substances(one thing becoming 2 or more.
  5. 11. Replacement / a chemical reaction in which two compounds exchange positive ions and form two new compounds.
  6. 12. Equation / a representation of a chemical reaction in which the reactants and products are expressed as formulas
  7. 14. Rate / the rate at which reactants change into products overtime
Down
  1. 1. / A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
  2. 3. / the number that is written below the element that lets you know the amount of atoms it has.
  3. 4. / a substance that undergoes change in a chemical reaction
  4. 6. Replacement / a chemical reaction in which one element takes the place of another element in a compound.
  5. 9. / (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
  6. 10. / the combination of 2 or more substances to form a compound (things combining together to become one.
  7. 13. / new substances formed as a result of a chemical reaction