rate of reaction ✓

Question 1

what effect does surface area of a solid have on the rate of reaction ?

Answer 1

larger surface area means faster reaction

Question 2

what effect does concentration of a solution have on the rate of reaction ?

Answer 2

higher the concentration means faster the reaction

Question 3

what effect does temperature have on the rate of reaction ?

Answer 3

higher temperature increases rate of reaction

Question 4

what effect does a catalyst have on the rate of reaction ?

Answer 4

increases rate of reaction

Question 5

why does a large surface area create an increased rate of reaction ?

Answer 5

• an increased chance of collisions between reactant particles
• so there are more collisions in any given time and the rate of reaction increases

Question 6

why does a higher concentration of a solution create an increased rate of reaction ?

Answer 6

• increases the number of particles moving around in the same volume
• the more crowded they are the more collisions occur and the rate of reaction increases.

Question 7

why does a higher temperature create an increased rate of reaction ?

Answer 7

• reactant particles move more quickly
• the energy of the particles increases
• the frequency of successful collisions between reactant particles increases
• the proportion of collisions which are successful also increases
• the rate of reaction increases

Question 8

why does a catalyst create an increased rate of reaction ?

Answer 8

• catalyst lowers the activation energy
• more particles can attain activation energy
• faster rate of reaction

Question 9

what is an experiment to investigate surface area of a solid on the rate of reaction ?

Answer 9

• get conical flask, a capillary tube coming out of bung in conical flaks attached to a gas syringe
• in the flask put some marble chips and some dilute hydrochloric acid
• measure volume of gas produces using gas syringe at regular time intervals
• repeat experiment with same volume of concentration of acid and same mass of marble chips but make the chips smaller
• repeat again but have the marble chips as a powdered chalk

Question 10

what is an experiment to investigate concentration of a solution on the rate of reaction ?

Answer 10

• get conical flask, a capillary tube coming out of bung in conical flaks attached to a gas syringe
• in the flask put some marble chips and some dilute hydrochloric acid
• measure volume of gas produces using gas syringe at regular time intervals
• repeat experiment with same mass and surface area of marble chips and same volume of acid but using different concentrations of acid

Question 11

what is an experiment to investigate temperature on the rate of reaction ?

Answer 11

• put some Sodium thiosulfate and hydrochloric acid into a conical flask
• time how long it takes for the reactants to react together to create a yellow precipitate of sulphur with will overtake the black mark
• repeat this experiment with different temperatures and time to see which goes faster

Question 12

what is an experiment to investigate the use of a catalyst on the rate of reaction ?

Answer 12

• get conical flask, a capillary tube coming out of bung in conical flaks attached to a gas syringe
• in the conical flask put a catalyst with some sodium peroxide
• measure the volume of gas produced at regular time intervals
• repeat experiment with same volume and concentration but using a different catalyst

Question 13

what does a catalyst provide and what is a catalyst ?

Answer 13

an alternative reaction pathway with lower activation energy but are chemically unchanged at the end of a reaction