Air Flashcards

1
Q

Air consists of the elements

A

Nitrogen (78%), oxygen (21%), argon (<1%), and the compounds carbon dioxide (0.03%) and water vapor (0-4%).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Air is a mixture because

A

It’s composition varies from place to place and the different gases condense as liquids at different temperatures.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Cobalt chloride papers

A

Used to test for the presence of water. It is blue when dry, pink when wet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Limewater is used to

A

test for carbon dioxide. Carbon dioxide turns limewater milky.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Oxygen is prepared

A

By the breakdown of hydrogen peroxide (H2O2) into oxygen and water in the presence of manganese dioxide (MnO2).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Manganese dioxide is a catalyst

A

It speeds up the breakdown of the hydrogen peroxide.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A glowing splint

A

Used to test for oxygen. Oxygen relight a glowing splint.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Carbon dioxide is prepared by

A

The reaction between dilute hydrochloric acid (HC1) and marble chips (calcium carbonate (CaCO3).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Oxygen is used for

A

Breathing, welding and burning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Carbon dioxide is used in

A

Photosynthesis, fire extinguishers and fizzy drinks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly