Gas test 1

Question 1

What is a correct definition of Matter?

Answer 1

Anything that has mass and occupies space.

Question 2

What is a correct definition of Element?

Answer 2

A substance that cannot be chemically reduced any further.

Question 3

What is the difference between an Element and a Compound?

Answer 3

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

Question 4

What is the difference between a compound and a mixture?

Answer 4

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

Question 5

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

Answer 5

Gas.

Question 6

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

Answer 6

Lead melting.

Question 7

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

Answer 7

Separation of water into hydrogen and oxygen.

Question 8

Liquid dishwashing detergent could be classified as?

Answer 8

Adhesive.

Question 9

Mercury in a glass tube could be classified as?

Answer 9

Cohesive.

Question 10

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

Answer 10

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

Question 11

The flow of solder into joint is a result of:

Answer 11

Adhesion and capillary attraction.

Question 12

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

Answer 12

Pressure and temperature.

Question 13

How does a pressure cooker reduce cooking times?

Answer 13

Increased pressure and increased temperature.

Question 14

What is a correct definition of density?

Answer 14

The mass per unite of volume.

Question 15

Which of the following is densest?

Answer 15

Mercury.

Question 16

Which of the following are the correct densities of water?

Answer 16

1000 kg/m3 or 62.4 lb/ft3

Question 17

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

Answer 17

The pipe wall of cast iron is thicker.

Question 18

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

Answer 18

667lb/ft3

Question 19

Calculate the mass of 3.2m3 of water.

Answer 19

3200 kg.

Question 20

Calculate the mass of 250 litres of propane liquid.

Answer 20

125 kg.

Question 21

Calculate the mass of 11000ft3 of air.

Answer 21

836 lb.

Question 22

Calculate the mass of 30m3 of propane gas.

Answer 22

58.05 kg.

Question 23

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

Answer 23

702 lb.

Question 24

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

Answer 24

139.32 kg.

Question 25

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

Answer 25

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

Question 26

What is the relative density of mercury?

Answer 26

13.6.

Question 27

What is the relative density of propane gas?

Answer 27

1.5.

Question 28

What is the relative density of water and air?

Answer 28

Water 1, air 1.

Question 29

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

Answer 29

Propane 1.5, natural gas 0.6.

Question 30

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

Answer 30

2670 kg.

Question 31

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

Answer 31

154.105 lb.

Question 32

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

Answer 32

29.389 lb.

Question 33

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

Answer 33

1.25m3

Question 34

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

Answer 34

312 lb

Question 35

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

Answer 35

0.355 m3

Question 36

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

Answer 36

Barely float, with most of the object submerged.

Question 37

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)

Answer 37

2703.3 kg.