Module 1 Water Temp nd Heat

Question 0

What does acidic and alkaline water do to pipes?

Answer 0

Acidic is soft water and damages pipes and alkaline is hard water and can clog pipes

Question 1

What are the properties of water?

Answer 1

Odourless/ tasteless/ transparent/ freezes at 0’c/ boils at 100’c/ universal solvent/ necessary for all life/ ph of 7/ only 3% of worlds water is fresh/ occurs in 3 states at ordinary temp gas liquid and solid

Question 2

Talk about the ph scale

Answer 2

It goes from 0-14 / 7 is neutral less is acidic and more is alkaline/

Question 3

Composition of water explain?

Answer 3

Water is made of 2part hydrogen to 1 part oxygen

Question 4

Water has weight explain?

Answer 4

At 4’c eAch litre of water weighs 1kg and it expands above or below that temp

Question 5

What is the classification of water?and explain

Answer 5

Hard and soft,,, hard when in contact with calcium and magnesium salts usually rocks SOFT is caused when falling through the air ith impurities picked up such as sulphur

Question 6

What is desalinisation?

Answer 6

It is the removal of salt from seawater

Question 7

Water is incompressible but fresh water does contain microscopic air bubbles which can allow for very minimal compression in certain conditions

Answer 7

Heating fresh water or reducing its pressure allows these microscopic air bubbles to expand and join together to form larger bubbles of air

Question 8

At 1lt water will take up different volumes at different temperatures name them?

Answer 8

ICE has 10% immediate expansion WATER has 4% expansion from 4’c - 100’c STEAM(gas) has some 1600lt times

Question 9

Specific gravity and relative density define it for water?

Answer 9

Pure water is the standard substance to which the weight & volume of all substances are compared

Question 10

What are the chemical symbol for - water / lead/ copper / cast iron?

Answer 10

Water h2o - lead pb- copper cu - cast iron fe

Question 11

What is the melting point of copper and steel ?

Answer 11

Copper 1080’c. Steel 1926’c

Question 12

Specific gravity it can also be defined as??

Answer 12

The weight of a given volume of any substance in comparison to the same volume of water at 4 degrees Celsius

Question 13

Lead 11.3 is 4 times heavier than aluminium 2.7 and cork 0.15 is 10 times heavier than polystyrene @ 0.015

Answer 13

Learn

Question 14

Define temperature ?

Answer 14

Temperature is measure of heat energy and dictates the rate of heat “flow “ to a cooler object

Question 15

What are the scales temperature are measured on?

Answer 15

The Celsius the Fahrenheit and the kelvin

Question 16

How do u convert to the Kelvin scale?

Answer 16

C’ to k’ add 273 K’ to c’ add - 273

Question 17

Heat transfer CONDUCTION explain?

Answer 17

Is the transfer of heat through or along a solid without the particles actually moving ( gold silver copper aluminium brass and bronze) are good conductors of heat

Question 18

Convection explain???

Answer 18

Is the transfer of heat through the air or a liquid cause when the molecule rise upwards after heating because they become lighter ( radiators)

Question 19

Radiation explain??

Answer 19

Is the transfer of heat to a solid objects in straight lines without heating the air ( the sun or hot fire)