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1 Ch - Phy Sci M 5B

Apologia Physical Science Module 5B

QuestionAnswer
chemical energy the energy stored in chemical bonds
activation energy the energy required to START a reaction
Avogadro's number one mole of any substance = 6.02 x10 to the 23rd power particles
mole an amount of a substance that contains approximately 6.02x10 to the 23rd power particles of a substance
bond energy a measure of how STRONG a chemical bond is
exothermic reaction a chemical reaction that RELEASES energy to its surroundings
endothermic reaction a chemical reaction that ABSORBS energy from its surroundings
law of the conservation of energy energy cannot be created or destroyed, it can only be transformed from one type of energy to another
dissociation when ionic compounds SPLIT into their ions
catalyst a substance that speeds up a reaction but is not changed in the process
combustion reaction a chemical reaction in which a substance reacts rapidly with OXYGEN, often producing heat and light
catching a marshmallow on fire while roasting example of a combustion reaction
fossil fuels such as natural gas referred to as hydrocarbons, composed of only carbon & hydrogen atoms
If a hydrocarbon & oxygen are reactants and _________ & __________ are products, this is a combustion reaction. CO2, H2O
In a double replacement reaction, the positive cations _________________ to form 2 new ionic compounds. exchange places
double replacement reaction a chemical reaction in which two compounds exchange positive ions and form new compounds
Breaking or forming bonds requires energy.
Energy is measured in joules or kilojoules (kJ).
reactants = products + energy exothermic reactions
reactants + energy = products endothermic reactions
Created by: MrsHough
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