CHEMICAL AND PHYSICAL CHANGES OF SUBSTANCE

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Across
  1. 1. A chemical reaction where a substance gains oxygen. Rusting is a slow form of oxidation.
  2. 3. The new substances formed in a chemical reaction.
  3. 4. (Short for Conservation of Mass) The principle that mass is not created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.
  4. 5. A type of change that does not create a new substance (e.g., change of state, dissolving). It is usually reversible.
  5. 7. A special type of mixture where one substance (the solute) is dissolved in another (the solvent), like salt in water.
  6. 8. Two or more substances that are not chemically combined and can be separated by physical methods.
  7. 9. A process where substances interact and change into new substances.
  8. 11. A characteristic used to describe or identify a substance (e.g., colour, melting point, reactivity).
  9. 12. A type of change where new substances with different properties are formed. It is usually irreversible.
  10. 14. The starting substances in a chemical reaction.
Down
  1. 2. A change that cannot be easily undone to get the original materials back (a key feature of most chemical changes).
  2. 6. A chemical reaction where a substance reacts rapidly with oxygen, releasing heat and light (burning).
  3. 9. A change that can be undone to get the original materials back (a key feature of most physical changes).
  4. 10. A solid that forms and settles out of a liquid during a chemical reaction.
  5. 13. A physical separation method used to separate an insoluble solid from a liquid.