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- 1. Multiple ChoiceDefine Reactantsthe building block of mattera description of a reactionthe substances produced in a reactionthe starting substances in a chemical reaction
- 2. Multiple ChoiceWhich is a sign of a chemical reaction?chemical properties changea gas formsa solid formsphysical properties change
- 3. Multiple ChoiceExplain why subscripts cannot change when balancing a chemical equationGives the amount of atomsYou can change subscriptsThe identity of a substance changesNone of the above
- 4. Multiple ChoiceDefine productsThe substance produced in a chemical reactionAnother word for ionsA description of a reactionProcess in which atoms bond together
- 5. Multiple ChoiceWhich of these are signs that a chemical reaction has occurred?Change in colorRelease of lightChange in odorAll are correct
- 6. Multiple ChoiceWhat is a chemical reaction?produces or yieldsan attraction between atomsa process in which one or more substances rearrange to form a new onestate that the identity stays the same before and after
- 7. Multiple ChoiceA chemical equation is a description of a reaction using symbolsTRUEFALSE
- 8. Multiple ChoiceAtoms separate, rearrange, and new bonds form in a chemical reactionFALSETRUE
- 9. Multiple ChoiceThe arrow in a chemical equation separates two or more reactantsFALSETRUE
- 10. Multiple ChoiceWhat is a coefficient?Number of protons of that substance in a reactionNumber of electrons of that substance in the reactionNumber of units of that substance in the reactionNumber of metallic bonds
- 11. Multiple ChoiceHow many hydrogen atoms are in 2 molecules of water (2H2O)?23104
- 12. Multiple ChoiceThe law of conservation of mass states that the total mass of the reactants and the products before and after in a chemical reaction will not be the sameTRUEFALSE
- 13. Multiple ChoiceA physical change produces new substancesFALSETRUE
- 14. Multiple ChoiceWhich of these is NOT a step in balancing a chemical equationAdd or change subscriptsAdd coefficientsWrite the unbalanced equationCount atoms of each element in the reactants and in the products
- 15. Multiple ChoiceWhat is the correct form to balance this equation:
H2 + O2 --> H2O4H2 + O2 --> H2O2H2 + O2 --> 2H2O2H2 + 2O2 --> 4H2O5H2 + 2O2 --> 10H2O - Answer choicesTagsAnswer choicesTags