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2nd Year SM > Gas test 1 > Flashcards

Gas test 1 Flashcards

1
Q

What is a correct definition of Matter?

A

Anything that has mass and occupies space.

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2
Q

What is a correct definition of Element?

A

A substance that cannot be chemically reduced any further.

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3
Q

What is the difference between an Element and a Compound?

A

A compound is a chemical union of different molecules while an element contains only molecules of that element.

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4
Q

What is the difference between a compound and a mixture?

A

A compound is a chemical union of different molecules while a mixture contains different molecules of different elements but not chemically united.

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5
Q

What is the category of a substance that has indefinite shape, indefinite volume and definite mass?

A

Gas.

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6
Q

Which of the following would be an example of a physical change?

A

Lead melting.

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7
Q

Which of the following is an example of a chemical change?

A

Separation of water into hydrogen and oxygen.

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8
Q

Liquid dishwashing detergent could be classified as?

A

Adhesive.

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9
Q

Mercury in a glass tube could be classified as?

A

Cohesive.

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10
Q

Which of the following is a correct definition of surface tension?

A

The molecular attraction of the molecules to each other at the surface of the liquid.

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11
Q

The flow of solder into joint is a result of:

A

Adhesion and capillary attraction.

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12
Q

The two factors that affect the state in which matter exists are:

A

Pressure and temperature.

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13
Q

How does a pressure cooker reduce cooking times?

A

Increased pressure and increased temperature.

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14
Q

What is a correct definition of density?

A

The mass per unite of volume.

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15
Q

Which of the following is densest?

A

Mercury.

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16
Q

Which of the following are the correct densities of water?

A

1000 kg/m3 or 62.4 lb/ft3

17
Q

If cast iron is less dense than copper, why is cast iron pipe heavier than copper tube?

A

The pipe wall of cast iron is thicker.

18
Q

Calculate the density of a metal block if 3 cubic feet weigh 2001 lb.

A

667lb/ft3

19
Q

Calculate the mass of 3.2m3 of water.

A

3200 kg.

20
Q

Calculate the mass of 250 litres of propane liquid.

A

125 kg.

21
Q

Calculate the mass of 11000ft3 of air.

A

836 lb.

22
Q

Calculate the mass of 30m3 of propane gas.

A

58.05 kg.

23
Q

What is the mass of water contained in a cylindrical tank that has a volume of 11.25ft3?

A

702 lb.

24
Q

What is the mass of methane gas contained in a spherical tank with a volume of 180m3?

A

139.32 kg.

25
Q

Which of the following is a correct definition of relative density for liquids and solids?

A

The mass of a substance compared to the mass of an equal volume of water.

26
Q

What is the relative density of mercury?

A

13.6.

27
Q

What is the relative density of propane gas?

A

1.5.

28
Q

What is the relative density of water and air?

A

Water 1, air 1.

29
Q

What is the relative density of propane gas and natural gas?

A

Propane 1.5, natural gas 0.6.

30
Q

What would be the mass of 3000L of a liquid with a relative density of 0.89?

A

2670 kg.

31
Q

What would be the mass of 10 gallons (US) of a liquid with a relative density of 1.85?

A

154.105 lb.

32
Q

What would be the mass of 300ft3 of a gas with a relative density of 1.289?

A

29.389 lb.

33
Q

An object has a mass of 1875 kg and a relative density of 1.5. Calculate the volume of the object.

A

1.25m3

34
Q

What is the buoyant force available on a 5ft3 object if it is immersed in water?

A

312 lb

35
Q

What is the volume of a object that weighs 925kg when weighed in air, but only 570kg when weighted in water?

A

0.355 m3

36
Q

What will an object with a volume of 0.658ft3 and a weight of 40 lb do when placed in water?

A

Barely float, with most of the object submerged.

37
Q

How much extra weight would be required to sink a sealed drum with a volume of 2.725m3 and a mass of 22.7kg? (Add 1kg extra to cause the drum to sink)

A

2703.3 kg.

2nd Year SM (8 decks)

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