8 - Science Chemical Reactions
energy
Breaking bonds requires _____ and forming bonds releases _____.
endothermic reaction
A reaction in which energy is absorbed is called an_____.
exothermic reaction
A reaction in which energy is released is called _______.
exothermic
All combustion reactions are ___________.
bonds
Chemical reactions break chemical ______ and then form new _______.
absorb
Endothermic reactions ____ energy.
bond energy
Energy used to bread bonds and form bonds is called ___________.
supply
Exothermic and endothermic reactions work together to ____ energy.
release
Exothermic reactions _____ energy.
plant, glucose
Fossil Fuels come mostly from ____ material that used photosynthesis to produce ____.
Exothermic releases energy; endothermic absorb energy.
How are exothermic and endothermic reactions different?
heat and light
In which ways might an exothermic reaction release energy?
light
Sometimes energy is released as ______ instead of heat, like glow sticks, fireflies, jelly fish.
bonds, released
The energy stored in these ____ remains over time and is then ____ when fossil fuels are burned.
photosynthesis
The most important endothermic reaction on Earth is _____.
more
There is _____ energy released when are bonds formed than is used to break the bonds
exothermic reactions
________ produce a great deal of heat and raise the temperature of their surroundings.