Energy Changes Flashcards
how do you calculate Rate
amount of product formed or amount of reactants used up / time
two things for a reaction to take place
particles must collide
with sufficient energy called activation energy
name factors affecting rate of reaction
temperature catalyst pressure concentration surface area
describe the effect of temperature on rate of reaction
when temperature is increased
the rate of reaction increases
because particles have more energy
therefore they collide more frequently
therefore faster rate of reaction
describe the effect of temperature decrease on rate of reaction
when temperature is decreased
the rate of reaction decreases
because particles have less energy
therefore they collide less frequently
therefore slower rate of reaction
describe the effect of high concentration on rate of reaction
high concentration means there are more particles in the given volume
there fore
rate of reaction is faster
particles collide more frequently
what is a rate of reaction
how fast the reactants are changed into products
what is a catalyst
a chemical which speeds up an reaction without it being used up
how do catalysts work
they provide an alternate route of lower activation energy
how do u calculate gradient
change in y / change in x
what is the collision theory
for reaction to occur
particles must collide with each other
with certain amount of energy
activation energy?
minimum amount of energy needed to start a reaction
what would happen if particles collide with less energy than activation energy
no product would be formed, they bounce off
advantages of a catalyst
less energy is needed as reaction occurs at low temperature
disadvantages of catalyst
expensive
reaction specific
