Key Principles 2

At what temperature does water have its maximum density?

• 0°C

• 4°C

• 99°C

• 100°C

What is the freezing point of water?

• 0°C or 273°K

• 4°C

• 99°C

• 100°C

From 4°C to 99°C, water expands by ____%.

• 4%

• 1%

• 10%

• 25%

Ice expands by ____%.

• 10%

• 5%

• 20%

• 15%

When water exceeds 100ºC it can turn to steam and expand to almost ______ times its original volume.

• 1,600

• 16

• 160

• 16,000

What likely caused the damage to the tank shown in the image?

• Water freezing

• Water expanding as it turned to steam

• Electrical fault

• Rusting

What is water a chemical compound of?

• Hydrogen and nitrogen

• Hydrogen and oxygen

• Oxygen and carbon

• Carbon and nitrogen

It is very rare to get pure water (H2O) and nothing else, as water is a very powerful _______.

• solvent

• acid

• metal

• fuel

Given enough time, water will ______, corrode, absorb almost anything.

• erode

• evaporate

• freeze

• boil

What is the process called when water changes from a liquid to a gas?

• Evaporation

• Condensation

• Precipitation

• Transpiration