collision theory

Question 1

what is kinetics ?

Answer 1

the study of factors that affect chemical rates ?

Question 2

breifley describe collision theory ?

Answer 2

for a reaction to take place between two molecules , they must collide with enough energy to break bonds .the collision must also take place between the parts of the molecule that are going to react together so they have to collide at the correct point .
most collisions don’t lead to a reaction

Question 3

list the 5 factors affecting rate of reaction

Answer 3

temprature
concentration of a solution
pressure of gas or reactant
surface area of solid reactants
use of a catalyst

Question 4

how does increasing the temperature affect rate of reaction ?

Answer 4

increases speed of molecules , in turn increases both their energy and the number of collisions

Question 5

how does increasing the concentration of a solution affect the rate of reaction?

Answer 5

more particles present in a given volume = collisions more likely = rate of reaction faster
however it gets used up so in most reactions the rate of reaction drops

Question 6

how does increasing the pressure of a gas affect rate of reaction ?

Answer 6

more molecules or atoms in a given volume= faster rate of reaction

Question 7

how does increasing the surface area of solid reactants affect rate of reaction?

Answer 7

greater the total surface area of a solid=more particles are available to collide with molecules in a gas or a liquid

Question 8

define catalyst ?

Answer 8

a substance that that can change rate of a chemical reaction without being chemically changed itself

Question 9

what is activation energy ?

Answer 9

the minimum energy required to start a reaction

Question 10

will endothermic or exothermic reactions require more energy

Answer 10

endothermic

Question 11

what is the top of the curve on a enthalpy diagram called ?

Answer 11

transition state/activated complex