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    1. What do all chemicals reactions involve?

    2. What do different reactions require?

    3. What can hydrogen do?

    4. What are the substances in a reaction called?

    5. Calcium + water= ?

    6. Are the reactants on the _______ or right?

    7. What is oxidation?

    8. What happens to atoms in a reaction?

    9. What does a balanced formal equation show?

    10. What is thermal decomposition reaction?