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FSS - INTERGRATED SCIENCE > F2 - SEM1 - Living things and air - 7.1 > Flashcards

F2 - SEM1 - Living things and air - 7.1 Flashcards

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Biology 101 flashcards
1
Q

Air is a ____ of gases.

7.1 Air

A

Air is a mixture of gases

7.1 Air

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2
Q

What are the components of air?

7.1 Air

A
  • 78% nitrogen
  • 21% oxygen
  • 0.04% carbon dioxide
  • 0.9% noble gases ( a group of unreactive gases)
  • water vapour
  • other gases

7.1 Air

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3
Q

How to test for oxygen?

7.1 Air

A

It relightens a glowing splint

7.1 Air

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4
Q

How to test for carbon dioxide?

7.1 Air

A
  • turns hydrogencarbonate indicator from red to yellow
  • turns lime water from colourless to milky

7.1 Air

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5
Q

How to test for Nitrogen?

7.1 Air

A

No simple test for nitrogen

7.1 Air

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6
Q

How to test for water?

7.1 Air

A

turns dry cobalt chloride paper from blue to pink

7.1 Air

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7
Q

Why you should not touch dry cobalt chloride paper with your hands?

7.1 Air

A

The moisture on your hands will change the colour of the paper

7.1 Air

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8
Q

Where do we keep the dry cobalt chloride paper?

7.1 Air

A

desiccator

7.1 Air

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9
Q

What are the properties of Oxygen?

7.1 Air

A
  • Colourless, Odourless
  • Supports burning

7.1 Air

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10
Q

What are the properties of Carbon dioxide?

7.1 Air

A
  • Colourless, Odourless
  • Does not support burning
  • Denser than air
  • Changes from solid (dry ice) to gas directly at -78C

7.1 Air

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11
Q

What are the properties of Nitrogen?

7.1 Air

A
  • Colourless, Odourless
  • Unreactive
  • Very low boiling point at -196C

7.1 Air

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12
Q

What are the uses of Oxygen?

7.1 Air

A
  • Mixed with a fuel gases to produce a flame for cutting and welding metals
  • Air with high oxygen content can be used to help patient with breathing difficulties

7.1 Air

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13
Q

What are the uses of Carbon dioxide?

7.1 Air

A
  • Used in some fire extinguishers
  • Used in stage shows to produce the effect of dense fog

7.1 Air

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14
Q

What are the uses of Nitrogen?

7.1 Air

A
  • Used in food packaging
  • Used in the storage of living cells

7.1 Air

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15
Q

What is Noble gases?

7.1 Air

A

A group of unreactive gases

7.1 Air

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16
Q

Give two examples of noble gases

7.1 Air

A
  • Helium
  • Neon

7.1 Air

17
Q

What are properties and uses of Helium?

7.1 Air

A
  • Properties: less dense than air
  • Uses: balloons filled with helium float in air

7.1 Air

18
Q

What are properties and uses of Neon?

7.1 Air

A

Properties: glows when electricity passes through it
Uses: often used to fill neon signs

7.1 Air

19
Q

True of False?

Glucose produced in plants can be stored as starch for later use

7.1 Air

A

True

7.1 Air

20
Q

True or False?

A burning splint burns more brightly in carbon dioxide

7.1 Air

A

False

A burning splint burns brightly in oxygen

7.1 Air

21
Q

True of False?

If a burning splint goes out quickly in a gas, the gas must be carbon dioxide

7.1 Air

A

False

Both carbon dioxide and nitrogen can

7.1 Air

22
Q

True or False?

Nitrogen can be used fill in packages of potato chips to keep the potato chips longer

7.1 Air

A

True

7.1 Air

23
Q

True or False?

Carbon dioxide can be used to produce a flame of very high temperature for welding metals

7.1 Air

A

False

Oxygen mixed with fuel gas to produce a flame of very high temperature

7.1 Air

24
Q

True or False?

Solid nitrogen is common known as dry ice

7.1 Air

A

False

7.1 Air

24
Q

True or False?

Solid carbon dioxide is common known as dry ice

7.1 Air

A

True

7.1 Air

25
Q

Suggest one daily use of the gas which turns the hydogencarbonate indicator yellow

7.1 Air

A

It can put out fire

Carbon dioxide

7.1

26
Q

True or False?

The percentages of different gases in the air are fixed

7.1 Air

A

False

7.1 Air

FSS - INTERGRATED SCIENCE (35 decks)

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