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- 1. Multiple Choice
What kind of change is a phase change?Physical - it's still the same substancechemical - it's made of chemicals - 2. Multiple ChoiceA chemical change happens when...a substance is changed at the atomic levelbonds are broken and formeda new substance is madeall of the above!
- 3. Multiple ChoiceA catalystis added to a reaction to make it slow downbreaks apart and is changedprovides an energetic short cut to the products
- 4. Multiple ChoiceChemical Formulas ...are written in alphabetical orderrepresent the destruction or creation of atomsrepresent how atoms are arranged in a chemical reaction
- 5. Multiple ChoiceThe compounds or elements present at the end of a reactionreactantscatalystproductsenergy
- 6. Multiple ChoiceThe compounds and elements that are present at the beginning of a reaction:reactantscatalystproductsenergy
- 7. Multiple ChoiceWhich of the following reactions is a combustion reaction ?MgCO3 + O2 → MgO + CO2C3H8 + 5O2 → 3CO2 + 4H2O6CO2 + 6H2O → C6H12O6 + 6O26CO2 + 6H2O → C6H12O6 + 6O2
- 8. Multiple ChoiceWhat is the law of Conservation of Mass?A measure of how much mass is created or destroyed.Mass can neither be created nor destroyed during a chemical reaction.
- 9. Multiple ChoiceExplain this graphA catalyst is used to speed up the reaction rateThe catalyst provides a short cut to the productsThe red line shows how the catalyst saves energyAll of these choices
- 10. Multiple ChoiceWhich of the following is a decomposition reaction?MgCo3 --> MgO + CO2SO3 + H2O --> H2SO42 Mg + O2 --> 2MgO
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