Required practical 7b

Question 1

What type of method is being used

Answer 1

Continuous monitoring method

Question 2

Step 1

Answer 2

Add 50cm3 of 0.1moldm-3 hydrochloric acid into a conical fask

Question 3

Step 2

Answer 3

Set up the gas syringe equipment

Question 4

Step 3

Answer 4

Add 6cm strip of magnesium into the conical flask, place bung on top and start the timer

Question 5

What should be done every couple of seconds

Answer 5

Swirl the flask

Question 6

Step 4

Answer 6

Record the volume of hydrogen gas produced every 15 seconds for 150 seconds

Question 7

Step 5

Answer 7

Repeat the experiment, changing the concentration of hydrochloric acid

Question 8

Analysis - 1

Answer 8

Plot graph of volume of hydrogen gas (y axis) against time (x axis)

Question 9

Analysis - 2

Answer 9

Draw lines of best fit

Question 10

Analysis - 3

Answer 10

Draw a tangent to the lines of best fit for each concentration at t=0

Question 11

Analysis - 4

Answer 11

Calculate the gradient of each tangent

Question 12

What does the gradient of each tangent tell us

Answer 12

The initial rate of reaction

Question 13

Analysis - 5

Answer 13

Compare the rate values