reactions Flashcards
(8 cards)
1
Q
define chemical change
A
an irreversible change in which a new substance is made
2
Q
define physical change
A
a reversible change where no new substance is made
3
Q
how would we know if a chemical change has occured?
A
change in colour
change in temperature
bubbles
light
4
Q
what is conservation of mass?
A
mass cannot be created or destroyed
5
Q
what is an oxidation reaction?
A
where something reacts with oxygen to produce an oxide
6
Q
describe an oxidation reaction with a word equation
A
magnesium + oxygen -> magnesium oxide
7
Q
what is combustion?
A
reacting fuel with oxygen to release energy
8
Q
describe a combustion reaction with a word equation
A
carbon + oxygen -> carbon dioxide
