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Topics 7-8 Unit 2

Topics 7-8 Matter and Chemical Change Study Set

QuestionAnswer
when does a chemical reaction occur? when one or more substances changes
what are the substances that go into a chemical reaction called? reactants
what are the substances produced by a chemical reaction called? products
what are 5 examples of evidence of a chemical change? formation of a gas, formation of a solid (precipitate), odour change, colour change, energy change
what is an energy change? an increase or decrease in certain properties.
what are examples of properties that increase or decrease as a result of an energy change? temperature, light, sound, electricity
what are reactions that release energy called? exothermic
what are exothermic reactions caused by? chemical bonds breaking
what are reactions that absorb energy called? endothermic
what are endothermic reactions caused by? chemical bonds forming
what is a reaction rate? how fast a reaction occurs
true or false: the rate of a chemical reaction can be sped up or slowed down. true
what are 4 ways a chemical reaction's speed can be changed? changing the temperature, stirring, changing the size of the reactants, changing the concentration of the reactants
(question XYZ) - true or false: at higher temperatures, the rate of ALL chemical reactions increases false
why is (question XYZ) true or false, depending on what you chose? it is false because at higher temperatures, the rate of MOST chemical reactions increases
what is another way to change the rate of a chemical reaction? to add or remove a substance called a catalyst
what is a catalyst? a substance that speeds up the rate of a reaction without being changed itself
does a catalyst affect the amount of product produced in a chemical reaction? If not, what does it affect? If so, the second question doesn't matter. no, it only affects the speed of a chemical reaction
what is an enzyme? a natural catalyst
what is an inhibitor substances that slow down chemical reactions
what is corrosion the oxidation of metals or rocks the presence of air and moisture
what is a common example of corrosion rust
what is combustion the highly exothermic reaction between a substance and oxygen
Created by: studycat420