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- 1. Multiple ChoiceWhat is the Law of Conservation of mass?Mass is created in a chemical reactionMass is created in a physical changeNew chemicals formed from a chemical reaction have a larger overall mass than the original reactantsMass is never created or destroyed
- 2. Multiple ChoiceIn a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?4g5g9g14g
- 3. Multiple ChoiceThe number in front of a compound or element is aSubscriptCoefficientSuperscriptCharge
- 4. Multiple ChoiceThe number to the lower side of an element is aSubscriptSuperscriptCoefficientCharge
- 5. Multiple ChoiceMatter can not be created nor destroyed: it can only beDestroyed a little bitInvisibleTransformed, changedNone of the above
- 6. Multiple ChoiceWhich is Chemical Equation is Balanced?CH₄+O₂------CO₂+2H₂OH₂+O₂-----2H₂O₄4Al+3O₂-----2Al₂O₃
- 7. Multiple ChoiceIs this equation balanced or unbalanced?
2Fe2O3 + 3C --> 4Fe + 3 CO2balancedunbalanced - 8. Multiple ChoiceIf a reaction starts with a total 75g of reactants it should producea total of 40g of productsa total of 75g of productsa total of 180 g of productsNone of the above
- 9. Multiple ChoiceIn the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?17g2g7gNone of the above
- 10. Multiple ChoiceBob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?200 g700 g1,100 g
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