Gasses Flashcards

1
Q

How are the particles in a gas arranged?

A

They are widely spread out.

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2
Q

Do gasses have mass?

A

Yes. Particles have mass; therefore, gas must have mass. This can be proven by weighing a balloon once it is deflated and inflated.

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3
Q

Can gasses be compressed?

A

Yes. If a syringe is plugged at the bottom but pushed, a gap will remain as the gas is still there — just very compressed. They can compress because of the space between particles.

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4
Q

Can gasses diffuse?

A

Yes, very easily. The particles of two gasses will collide and begin to diffuse, spreading from an area of high concentration to one of low concentration.

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5
Q

What are some properties of carbon dioxide?

A

Colourless,
Odourless,
Denser than air/oxygen.

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6
Q

How can carbon dioxide be tested for?

A

Bubble the gas sample through colourless limewater. It will turn milky/cloudy white if CO2 is present.

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7
Q

What are some properties of oxygen?

A

Colourless.
Odourless.
~Same density as air.

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8
Q

How can oxygen be tested for?

A

It will relight a ‘glowing’ splint that has just gone out. This is because the other two components of the fire triangle (heat + fuel) are present.

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9
Q

What are some properties of hydrogen?

A

Colourless.
Odourless.
Rarer (less dense) than oxygen/air.

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10
Q

How is hydrogen tested for?

A

The ‘squeaky pop’ test. A lit splint will make a ‘pop’ sound in a hydrogen sample.

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11
Q

How percentage of air is nitrogen?

A

78%.

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12
Q

What percentage of air is oxygen?

A

21%

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13
Q

What percentage of air is argon?

A

0.93%

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14
Q

What percentage of air is neon?

A

<1% (0.0018%).

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15
Q

What percentage of air is carbon dioxide?

A

<1% (0.03 recurring %).

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16
Q

What percentage of air is helium?

A

<1% (0.0005%).

17
Q

What percentage of air is water vapour?

A

0.1 — 6%.

Varies depending on temp., time and location.

18
Q

What percentage of air is xenon?

A

<1% (negligible).

19
Q

What percentage of air is krypton?

A

<1% (negligible).

20
Q

What percentage of air is radon?

A

<1% (negligible).

21
Q

What kinds of substance does air contain?

A

Gases.
Bacteria.
Dust.
Spores.

22
Q

What are some uses for CO2?

A

Fire extinguishers — will smother oxygen.
Global warming.
Carbonated soft drinks.
Dry ice.

23
Q

What are some uses for O2?

A
Ærobic respiration.
Combustion.
Baking.
Pressurised oxygen.
Ventilator.
Balloons.
Aqualungs.
24
Q

What are some uses for H2?

A

Fuel.

Weather balloons.

25
Q

How can O2 be created?

A

A reaction of hydrogen peroxide w/ magnesium oxide.

26
Q

How can CO2 be created?

A

Reacting a metal carbonate and acid together.

27
Q

How can H2 be created?

A

Reacting a metal and acid together.