heat on chemicals Flashcards
1
Q
what are reactants
A
substances present at the start of the reaction
2
Q
what are products
A
substances that are produced as a result of a chemical reaction
3
Q
combustion reaction
A
reaction which takes place in the presence of oxygen
4
Q
activation energy
A
energy required for a reaction to begin
5
Q
spontaneous reaction
A
reaction which takes place immediatly
6
Q
exothermic reaction
A
reaction that gives off heat
7
Q
endothermic reaction
A
reaction which requires heat to take place
8
Q
chemical change
A
when new compounds are formed
9
Q
physical change
A
a visible change occurs
10
Q
ph scale
A
a scale from 1-14 which determines if a substance is acidic, neutral or basic
10
Q
A
