Rate of Reaction Experiments

Question 1

Carry out a experiment to measure how surface area affects the rate of reaction

Answer 1

• pour dilute HCl into flask
• place Maribel chips into HCl
• close flask with a bung attached to a syringe
• measure the volume of CO2 produced using gas syringe
• take readings at regular time intervals
• repeat experiment with exactly same mass and concentration of acid + exactly same mass of marble chips, but more crushed up
• then repeat with same mass of marble powder / chalk

Question 2

Using finer particles of solid mean the rate is higher/lower

Answer 2

Higher

Question 3

What is the effect on the surface area if there are finer particles of marble

Answer 3

Surface area increases

Question 4

What would a line graph of volume of gas produced and time show if the finer particles where placed into the dilute acid and why?

Answer 4

• the initial rise would be steeper and the lines will flatten out sooner
• the finer the particles and greater the surface area = sooner the reaction finishes = faster reaction

Question 5

What will the line look like if the is a greater mass of marble chips and why?

Answer 5

• the rise of the line will be steeper and it will rise above the lines showing a smaller mass.
• extra surface area = faster reaction = more gas evolved overall

Question 6

How to carry out a experiment to measure how changing the concentration of acid affects the rate?

Answer 6

• carry out the same experiment as the surface area one
• but repeat with exactly same mass and surface area of marble chips + same volume of acid but different concentration of acid

Question 7

What will a line look like with higher concentration and why?

Answer 7

• steeper line and plateau earlier
• higher concentration = faster reader = finishes sooner

Question 8

Sodium thiosulfate and hydrochloric acid are both c….. solutions

Answer 8

Clear

Question 9

Sodium thiosulfate and hydrochloric acid React together to form what?

Answer 9

yellow precipitate of sulfate

Question 10

Carry out an experiment to measure how changing the temperature affects the rate?

Answer 10

• same principle as precipitation reaction
• measure time for how long black mark disappears through looking through cloudy sulfur
• heat both solutions in water bath before mixing
• REPEAT at different temperatures