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- Multiple ChoicePlease save your changes before editing any questions.
What kind of change is a phase change?Physical - it's still the same substancechemical - it's made of chemicals - Multiple ChoicePlease save your changes before editing any questions.A chemical change happens when...a substance is changed at the atomic levelbonds are broken and formeda new substance is madeall of the above!
- Multiple ChoicePlease save your changes before editing any questions.A catalystis added to a reaction to make it slow downbreaks apart and is changedprovides an energetic short cut to the products
- Multiple ChoicePlease save your changes before editing any questions.Chemical Formulas ...are written in alphabetical orderrepresent the destruction or creation of atomsrepresent how atoms are arranged in a chemical reaction
- Multiple ChoicePlease save your changes before editing any questions.The compounds or elements present at the end of a reactionreactantscatalystproductsenergy
- Multiple ChoicePlease save your changes before editing any questions.The compounds and elements that are present at the beginning of a reaction:reactantscatalystproductsenergy
- Multiple ChoicePlease save your changes before editing any questions.Which of the following reactions is a combustion reaction ?MgCO3 + O2 → MgO + CO2C3H8 + 5O2 → 3CO2 + 4H2O6CO2 + 6H2O → C6H12O6 + 6O26CO2 + 6H2O → C6H12O6 + 6O2
- Multiple ChoicePlease save your changes before editing any questions.What 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.
- Multiple ChoicePlease save your changes before editing any questions.Explain 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
- Multiple ChoicePlease save your changes before editing any questions.Which of the following is a decomposition reaction?MgCo3 --> MgO + CO2SO3 + H2O --> H2SO42 Mg + O2 --> 2MgO