Rates of Reaction facts Flashcards
(30 cards)
what does the rate of reaction tell us
it tells us the speed of which a reaction occurs
what are 4 factors that can change the rate of reaction
Increasing tempereture , increasing cosentration , decreasig particle size & adding a catalyst / enzyme
what will increasing temp do
speed up rate of reaction
what will decreasing temp do
slow down rate of reaction
what will increasing particle size do
slow down rate of reaction
what will decreasing particle size do
speed up rate of reaction
what will increasing concentration do
speed up rate of reaction
what will decreasing concentration do
slow down rate of reaction
what will adding a catalyst / enzyme do
speed up rate of reaction
what is a catalyst
A substance that increases the rate of a chemical reaction without being used up.
what is an enzyme
a biological catalyst & are found in all living cells
what temp does an enzyme work best at
human body temp - 37C
name 2 types of enzymes
Carbohydrase , Zymase , Invertase , Protease
factors of chemical reaction
colour change , Energy given out ( Light ,heat , sound) , Solid appears/disappears , Gas is produced
what is a physical change
a change of matter from one state to another ( without producing a new substance )
solid to liquid
melting
liquid to gas
boiling
gas to liquid
condensing
liquid to solid
freezing
what is concentration
how much
substance is dissolved in a volume
of water.
what is dilution
the action of e.g
adding more water to a
solution to decrease
concentration.
what is a salt bridge used for
a salt bridge is used to link two metals = without it w=there is no voltage
What is formed in all chemical reactions
A new substance ( called a product , the substances you start with are called reactants )
Exothermic reaction is when
Energy exits , temp of surroundings increases
