collision theory & surface area

Question 1

4 main factors affecting the rate of a chemical reaction

Answer 1

temperature, surface area of solids, concentration of solutions or pressure of gases, presence of a catalyst

Question 2

what is activation energy

Answer 2

min amount of energy that particles must have before they can react

Question 3

if you increase the chance of particles reacting you…

Answer 3

increase the rate of reaction

Question 4

if the surface area:volume of any solid reactants is increased…

Answer 4

the rate of the chemical reaction increases as it increases the frequency of collisions between reacting particles

Question 5

why does raising the temperature increase the rate of reaction

Answer 5

• particles collide more often
• particles collide with more energy

Question 6

what does increasing the concentration of reactants in a solution do?

Answer 6

increases the frequency of collisions between particles

Question 7

what does increasing the pressure of reacting gases do?

Answer 7

increases frequency of collisions

Question 8

what is a catalyst

Answer 8

a substance that can change the rate of reaction yet not changed chemically itself by the end of reactions

Question 9

how do catalysts increase the rate of reaction

Answer 9

by providing an alternative reaction pathway to the products and a lower activation energy

Question 10

when are catalysts used

Answer 10

whenever possible in industry to increase rates of reaction and reduce energy costs