testing anions and gases

testing for anions and gases

​OBJECTIVES

preparing gases in the lab

preparing gases in the lab

​downward displacement of air

​upward displacement of air

Multiple Select

how to collect ammonia gas?

• downward displacement of air

• upward displacement of air

• over water

• gas syringe

Multiple Select

how to collect carbon dioxide gas?

• downward displacement of air

• upward displacement of air

• over water

• gas syringe

Multiple Select

how to collect hydrogen gas?

• downward displacement of air

• upward displacement of air

• over water

• gas syringe

testing gases (TB p261)

Multiple Select

tick all of the colorless gases

• ammonia, NH3

• carbon dioxide, CO2

• chlorine, Cl2

• hydrogen, H2

• sulfur dioxide, SO2

Multiple Select

tick all of the poisonous gases

• ammonia, NH3

• carbon dioxide, CO2

• chlorine, Cl2

• hydrogen, H2

• sulfur dioxide, SO2

Multiple Choice

which gas is known as bleaching gas?

• ammonia

• chlorine

• sulfur dioxide

• carbon dioxide

Multiple Choice

how ammonia gas is tested?

• using damp red litmus paper

• using limewater

• using glowing splint

• using filter paper soaked in KMnO4

• using lighted splint

Multiple Choice

how oxygen gas is tested?

• using damp red litmus paper

• using limewater

• using glowing splint

• using filter paper soaked in KMnO4

• using lighted splint

Multiple Choice

how hydrogen gas is tested?

• using damp red litmus paper

• using limewater

• using glowing splint

• using filter paper soaked in KMnO4

• using lighted splint

Multiple Choice

how carbon dioxide gas is tested?

• using damp red litmus paper

• using limewater

• using glowing splint

• using filter paper soaked in KMnO4

• using lighted splint

Multiple Choice

how sulfur dioxide gas is tested?

• using damp red litmus paper

• using limewater

• using glowing splint

• using filter paper soaked in KMnO4

• using lighted splint

Multiple Choice

when sulfur dioxide is passed through soaked filter paper in KMnO4, the color of KMnO4 changes from orange to free

• true

• false

Multiple Choice

when carbon dioxide passes through limewater, it changes limewater into cloudy and form CaCO3

• true

• false

Multiple Choice

what will happen when oxygen is tested using glowing splint

• it will re-light again

• it pops with squeaky sound

Multiple Select

tick the possible ways to test water vapor

• using anhydrous CuSO4 and it changes from white to blue

• using anhydrous CuSO4 and it changes from blue to white

• using anhydrous CoCl2 and it changes from blue to pink

• using anhydrous CoCl2 and it changes from pink to blue

testing for anions

TB 19.5 page 264-265

Multiple Choice

what is the chemical test for carbonate, CO3^2- ions?

• add aq NaOH and Al foil, heat and test the gas with damp red litmus paper

• add acidified KMnO4 and it changes from purple to colorless

• add dilute HCl and pass the gas through limewater, limewater turns milky

• add nitric acid followed by barium nitrate and it gives white ppt

Multiple Choice

what is the chemical test for sulfate, SO4^2- ions?

• add aq NaOH and Al foil, heat and test the gas with damp red litmus paper

• add acidified KMnO4 and it changes from purple to colorless

• add dilute HCl and pass the gas through limewater, limewater turns milky

• add nitric acid followed by barium nitrate and it gives white ppt

Multiple Choice

what is the chemical test for sulfite, SO3^2- ions?

• add aq NaOH and Al foil, heat and test the gas with damp red litmus paper

• add acidified KMnO4 and it changes from purple to colorless

• add dilute HCl and pass the gas through limewater, limewater turns milky

• add nitric acid followed by barium nitrate and it gives white ppt

Multiple Choice

what is the chemical test for nitrate, NO3^- ions?

• add aq NaOH and Al foil, heat and test the gas with damp red litmus paper

• add acidified KMnO4 and it changes from purple to colorless

• add dilute HCl and pass the gas through limewater, limewater turns milky

• add nitric acid followed by barium nitrate and it gives white ppt