Oxygen & Oxides Flashcards
1
Q
What are gases present in air and what are their percentages?
A
Nitrogen - 78%
Oxygen - 21%
Argon - 0.93%
Carbon dioxide - 0.04%
2
Q
How can you make oxygen in the lab?
A
Hydrogen peroxide will decompose into water and oxygen. The reaction is sped up by manganese(IV) oxide catalyst
3
Q
What colour flame does magnesium burn with?
A
Bright white flame
4
Q
What colour flame does carbon burn with?
A
Orange/yellowy flame
5
Q
What colour flame does Sulfur burn with?
A
A pale blue flame
6
Q
Give one way that carbon dioxide can be produced?
A
Calcium carbonate is put at the bottom of a flask and dilute hydrochloric acid is added. The HCl and calcium carbonate react to produce calcium chloride, water and carbon dioxide. The carbon dioxide gas is collected in a gas syringe
