Endo and exothermic reactions year 8

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Across
  1. 2. Reaction where energy is taken in from surroundings.
  2. 6. In an exothermic reaction which has higher energy the reactants or the products?
  3. 8. A change in which a new substance if formed.
  4. 10. Conservation of _________ when the mass of reactants = mass of products in a closed system.
  5. 11. Biological catalyst
  6. 13. Force that holds atoms together in molecules.
Down
  1. 1. One that changes the physical properties of a substance, but no new substance is formed.
  2. 3. ____________ variable the thing you change (x axis).
  3. 4. Substances formed in a chemical reaction, shown after the reaction arrow in an equation
  4. 5. balanced or equal
  5. 6. Substances that react together, show before the arrow in an equation.
  6. 7. ___________ variable things you keep the same to make results valid.
  7. 8. Substance that speeds up a chemical reaction but are unchanged at the end (can be reused).
  8. 9. Reaction where energy is given out (transferred to surroundings) as heat
  9. 12. ___________ variable the thing you measure (y axis).