Plumbing Science Level 1, Properties of water

What is the most abundant compound on Earth?

• Oxygen

• Water

• Carbon Dioxide

• Nitrogen

Approximately what percentage of Earth's surface is covered by water?

• 50%

• 60%

• 70%

• 80%

What are the properties of water in its purest form?

• Colorless, odourless, and tasteless

• Colorful, fragrant, and sweet

• Bitter, odourless, and colorful

• Sweet, fragrant, and tasteless

What causes the taste in water?

• The minerals dissolved in it

• The temperature of the water

• The color of the water

• The source of the water

In how many states of matter can water exist?

• One

• Two

• Three

• Four

Which of the following is NOT a state of matter in which water can exist?

• Solid

• Plasma

• Fluid

• Gas

What is the freezing point of pure water at sea level?

• 0°C (or 273K)

• 100°C (or 373K)

• -10°C (or 263K)

• 50°C (or 323K)

How can the freezing point of water be lowered in plumbing systems?

• By adding salt

• By adding anti-freeze (glycol)

• By increasing the temperature

• By decreasing the pressure

What happens to the freezing point of water if the surrounding pressure is increased above sea level?

• It increases

• It decreases

• It remains the same

• It becomes unpredictable

What happens to water molecules when water freezes?

• They move further apart.

• They become gaseous.

• They are packed together to form a solid.

• They dissolve in air.