Chapter 25-Air And Oxygen Flashcards Preview

Science > Chapter 25-Air And Oxygen > Flashcards

Flashcards in Chapter 25-Air And Oxygen Deck (14):
1

How do we test for water?

We use anhydrous copper sulfate or cobalt chloride paper.

2

How do we make oxygen in the laboratory?

By decomposing hydrogen peroxide using manganese dioxide as a catalyst.

3

Name the 6 properties of oxygen.

Colourless, odourless, tasteless, supports combustion, neutral, slightly soluble in water.

4

What does carbon dioxide form when it dissolves in water?

Carbonic acid.

5

Magnesium burns in oxygen to form...

Magnesium oxide.

6

Magnesium dissolves in water to form...

Magnesium hydroxide.

7

Carbon burns in oxygen to form...

Carbon dioxide.

8

Name 3 uses of oxygen.

Burning and welding, space rockets, medicine.

9

How do we investigate what percentage of air is oxygen?

We burn a night light in a fixed volume of air.

10

How do we show that carbon dioxide is present in air?

We use a vacuum pump through limewater and observe how it turns milky.

11

How do we show that water vapour is present in air?

We use salt, ice and anhydrous copper sulfate/cobalt chloride paper.

12

What is air?

Air is a mixture of gases consisting of 21% oxygen, 78% nitrogen and 1% inert gases and carbon dioxide.

13

What is the chemical equation for the laboratory preparation of oxygen?

2H2O2-2H2O+O2

14

What is the word equation for the laboratory preparation of oxygen?

Hydrogen peroxide-water+oxygen
Catalyst=manganese dioxide. (MnO2)