WorksheetsVandaman - Properties & Principles of Water
Total questions: 14
Worksheet time: 7mins
Hard water is produced when rainwater falls onto which type of ground?
Peat or moss
Limestone or chalk
Clay or sand
Sand or cement
Above what temperature do calcium carbonates start to leave hard water?
550C
600C
650C
700C
How does limescale affect a hot water system: pipework, cylinder, boiler and draw-off points? 3 answers
Blockages
Inefficient
Higher water temperature
Longer heat-up times
Discolouring of water
What is the pH number for pure water?
pH5
pH6
pH7
pH8
What is a drawback of soft water?
Takes longer for soap to lather
It is acidic and can affect the electrolytic corrosion
Soap lathers too quickly
It is alkaline can affect the electrolytic corrosion
What is latent heat?
The heat that is required to bring a about a physical change in a substance
The heat that is required to bring about a change in temperature of a gas or object with no change in phase
Water is defined in chemical terms as a compound of which two gasses:
Hydrogen & Carbon dioxide
Carbon dioxide & Oxygen
Hydrogen & Oxygen
Methane & Carbon dioxide
What is the boiling point of water at sea level?
1000C
1100C
950C
870C
At what temperature is water at its maximum density?
40C
140C
400C
4000C
Steam expands by:
160 times
1,600 times
16,000 times
1.6 times
Ice expands by:
5%
10%
15%
50%
What is the freezing point of water?
00C
-40C
4 0C
-100C
The water in a hot water cylinder exerts its pressure:
Sideways only
Downwards only
Upwards only
Downwards and sideways
Sideways only
Atmospheric pressure at sea level is:
303.1Pa
201.3Pa
101.3Pa
111.3Pa
