S: U6
Endothermic
A chemical reaction that ABSORBS energy
Chemical equations
A short, easy way to show a chemical reaction using symbols
Exothermic
Chemical reaction that RELEASES energy
Law of conservation of energy
Energy cannot be created or destroyed but only changed from one form to another
Mass
Measure of how much matter an object is made of
Fusion
Process in which 2 atomic nuclei combine to form a larger nucleus; produces heavier elements and releases a huge amount of energy; produces energy in stars
Law of conservation of matter (mass)
Regardless of how substances (in a closed system) are changed, the total mass remains the same
Products
Substance formed by a chemical reaction; product is made of the rearrangement of atoms and bonds in reactants
Reactants
Substance that is present at the beginning of a chemical reaction & is changed into a new substance
Fission
The process of splitting the nucleus of a radioactive atom; produces lighter elements & releases a huge amount of energy