chapter 17

Question 1

How to measure rate of reaction

Answer 1

change in volume
change in mass

Question 2

how to measure change volume

Answer 2

measaure volume of gas at fixed time intervals, using gas syringe
measure time interval with stopwatch

Question 3

how to measure change in volume

Answer 3

measure the mass of flask contents at fixed time intervals, using electronic balance
measure time interval with stopwatch

Question 4

How does graph change as time passes

Answer 4

rate of reaction is the highest at the start ( steepest gradient)
rate of reaction decreases over time
reach 0 at the end

Question 5

why reaction changes

Answer 5

lower concentration of limiting reactant

Question 6

how to measure average speed

Answer 6

speed=total vol/time taken

Question 7

speed

Answer 7

g/r

Question 8

what affects rate of react

Answer 8

concentration of reactants
temperature of reactants
pressure of gas
particle size of solid reactants

Question 9

describe how concentration effects

Answer 9

increase speed, more particles per unit volume
frequency of effective collisions increase

Question 10

how temp of reactants

Answer 10

particles gain more energy and move faster
more particles have energy equal or greater to activation energy
frequency of effective colisions increase

Question 11

how pressure affects

Answer 11

particles are forced closer to together in smaller vol
more particle per unit vol
freq of effective collisions increases

Question 12

How particle size affects

Answer 12

greater surface area for particles to collide
freq of effective collisions increases

Question 13

how does catalyst effect rate of reaction

Answer 13

provide alternate pathway of lower activation egery for the reaction to occur. this speeds up rate of reaction as particles will have energy greater than or equal to activation energy

Question 14

how does acid of diff ph scale affect ror

Answer 14

higher concentration of h+ ions
2:1 ratio