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THE PROPERTIES OF OXYGEN AND CARBON DIOXIDE CHAPTER 5: CHAPTER 5: THE AIR AROUND US THE AIR AROUND US

Properties of Oxygen and Carbon Dioxide

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Page 1: Properties of Oxygen and Carbon Dioxide

THE PROPERTIES OF OXYGEN AND CARBON

DIOXIDE

CHAPTER 5: CHAPTER 5: THE AIR AROUND US THE AIR AROUND US

Page 2: Properties of Oxygen and Carbon Dioxide

ACTIVITY 5.4 Activities Observation and inferences

Oxygen Carbon dioxide

A. Solubility in water

1. Invert a test tube full of oxygen into a beaker of water as shown in the diagram.

2. Do the same with a test tube of carbon dioxide.

3. Record your observations.

Level of water rises a little in the test tube.

Level of water rises a little in the test tube.

Gas

Water

Page 3: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

B. Solubility in sodium hydroxide

1.Invert a test tube full of oxygen into a beaker of sodium hydroxide as shown in the diagram.2.Do the same with a test tube of carbon dioxide.3.Record your observations.

Sodium hydroxide solution does not rises in the test tube.

Oxygen is not soluble in sodium hydroxide solution.

Sodium hydroxide solution rises to fill up the test tube.

Carbon dioxide is soluble in sodium hydroxide solution.

Gas

Sodium hydroxid

e

Page 4: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

C. Testing with a burning wooden splinter

1.Insert a burning wooden splinter into a test tube of oxygen. 2.Do the same with a test tube of carbon dioxide.3.Observe what happen to the burning wooden splinter.

Wooden splinter continues to burn.

Oxygen supports combustion but does not burn

Flame of wooden splinter goes out.

Carbon dioxide does not support combustion and does not burn.

Gas

Burning

wooden

splinter

Page 5: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

D. Testing with a glowing wooden splinter

1.Insert a glowing wooden splinter into a test tube of oxygen. 2.Do the same with a test tube of carbon dioxide.3.Observe what happen to the glowing wooden splinter.

The glowing wooden splinter ignites.

Oxygen supports combustion but does not burn

The glowing wooden splinter goes out.

Carbon dioxide does not support combustion and does not burn.

Gas

Glowing

wooden

splinter

Page 6: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

E. Testing with litmus paper.

1.Open the rubber stopper of test tube containing oxygen and insert red litmus paper and blue litmus paper.2.Close the test tube with the stopper.3.Record any change to the litmus paper.4.Do the same with the test tube containing carbon dioxide.

No change in colours of the litmus paper.

Oxygen is neutral.

The moist blue litmus paper turns red

Carbon dioxide is acidic.

Gas

Red litmu

s pape

r

Blue litmu

s pape

r

Page 7: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

F. Testing with limewater.

1.Open the rubber stopper of test tube containing oxygen and add a few drops containing limewater. 2.Close the test tube with the stopper and shake it.3.Record any change to the colour of limewater.4.Do the same with the test tube containing carbon dioxide.

The limewater remains clear.

Oxygen does not react with limewater.

The limewater turns cloudy.

Carbon dioxide reacts with limewater to form insoluble calcium carbonate which look cloudy.

limewater

Gas

Page 8: Properties of Oxygen and Carbon Dioxide

Activities Observation and inferences

Oxygen Carbon dioxide

G. Testing with bicarbonate indicator.

1.Open the rubber stopper of test tube containing oxygen and add a few drops containing bicarbonate indicator. 2.Close the test tube with the stopper and shake it.3.Record any change to the colour of bicarbonate indicator.4.Do the same with the test tube containing carbon dioxide.

The colour of the bicarbonate indicator remains red.

Oxygen is neutral.

The colour of the bicarbonate indicator changed from red to yellow. .Carbon dioxide is acidic.

Gas

Bicarbonate

indicator

Page 9: Properties of Oxygen and Carbon Dioxide

Comparison between oxygen and carbon dioxide

Properties Oxygen Carbon dioxide

Solubility in water

Solubility in sodium hydroxide solution

Effect on a burning wooden splinter

Effect on a glowing wooden splinter

Effect on red and blue litmus paper

Effect on limewater

Effect on bicarbonate indicator

Slightly soluble Slightly soluble

Very soluble

Splinter burns more brightly.

Limewater turns cloudy

Changes the colour of indicator from

red to yellowNo changes

Not soluble

Splinter goes out

Splinter is ignited Splinter goes out

No changes. Oxygen is neutral

Changes the moist blue litmus paper

to red.

No changes

Page 10: Properties of Oxygen and Carbon Dioxide

Test for oxygen and carbon dioxide Test

1. Test for oxygen a) the presence of oxygen can

be test with a glowing splinter.

b) When a glowing splinter is put into a test tube containing oxygen, it will light up.

c) This is because oxygen support combustion.

2. Test for carbon dioxidea) the presence of carbon dioxide can be test with limewater.b)Limewater becomes cloudy in the presence of carbon dioxide c) This is because carbon dioxide reacts with limewater to form calcium carbonate which is insoluble in water. .

Gas

Glowing

wooden

splinter

Before

After

limewater

Gas

Before

After

Page 11: Properties of Oxygen and Carbon Dioxide

Exercise:

Page 60Exersices 5.2 (all)

Buat semua 1,2 dan 3Buku amali

Page 12: Properties of Oxygen and Carbon Dioxide

THE END