Demonstrating oxygen is produced during photosynthesis

Question 1

How would you prove the gas collected is oxygen

Answer 1

Insert glowing splint, if it relights it is oxygenGi

Question 2

Three ways we could increase rate of production of bubbles

Answer 2

Move light closer (increase light intensity)
Increase temprarature (but not too much)
Increase C02 concentration (add sodium hydrogen carbonate)

Question 3

Is counting bubbles a good way to measure how fast photosynthesis is taking place

Answer 3

No not very accurate, bubbles can be different sizes

Question 4

Can you think of a better way to measure how fast photosynthesis is taking place (not counting bubbles)

Answer 4

Use an oxygen electrode and data logger to measure change in oxygen concentration