Fourth Page of Notes

Question 1

Draw a diagram and explain how to find the percentage of oxygen used up when copper gains its black coating.

Answer 1

Check notes.

Question 2

What is copper oxide and what percentage of the air is oxygen?

Answer 2

• compound
• copper + oxygen goes to COPPER OXIDE
• 20%

Question 3

What is oxygen, nitrogen, carbon dioxide and argon need for?

Answer 3

• oxygen respiration burning
• cb photosynthesis
• nitrogen contains compound to make proteins
• argon light bulbs so filament does not burn out

Question 4

Does copper increase in mass if it is heated? Why?

Answer 4

• yes
• extra layer - copper oxide
• oxygen added
• weight increases.