Identifying Gases

Question 1

Carbon Dioxide (CO2)

Answer 1

When passed through limewater (Ca(OH)2), a white precipitate forms (CaCO3)

Question 2

Carbon Monoxide (CO)

Answer 2

After being burned, the product passed through limewater (Ca(OH)2) forms a white precipitate

Question 3

Hydrogen (H2)

Answer 3

Gas explodes after being mixed with air and ignited

Burns with blue flame and product H2O turns cobalt chloride paper from blue to pink

Question 4

Hydrogen Chloride (HCl)

Answer 4

Choking odor
Vapor fumes form when you exhale over this gas
After dissolving this in water, it turns blue litmus red
White precipitate forms when this is mixed with AgNO3

Question 5

Hydrogen Sulfide (H2S)

Answer 5

Rotten egg smell

Turns brown-black when tested with moist lead acetate paper (forms PbS)

Question 6

Oxygen (O2)

Answer 6

If glowing splint inserted into this gas, bursts into flames
Add NO gas (nitric oxide) then this turns reddish brown

Question 7

Ammonia (NH3)

Answer 7

Sharp odor
Turns red litmus blue
White fumes form when exposed to HCl (NH4Cl)