Physical Science Semester 2 Review

What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"

• Purity
• Polarity and cohesion
• High heat capacity
• Expansion upon freezing

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.
• Water has a high heat capacity.
• Water acts as a buffer.
• Water is non-polar.

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
  
• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
  

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

What part of the hydrological cycle does this picture show?

• condensation

• precipitation

• evaporation

Which is the opposite of condensation?

• runoff
• evaporation
• precipitation
• transpiration

Which best explains why runoff is important?

• It returns water to other locations on Earth
• It increases the chance of flooding
• It makes evaporation occur faster
• It increases condensation

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-1

What does groundwater do?

• It sends water to our buildings, houses, and water transplant places
• to the sky
• to the sun
• To the Earth's surfaces

What is the hydrological cycle?

• the 3 forms of water

• the movement of water on, above, or below the surface of the Earth

• when water melts

• when clouds form

What do sedimentation tanks do at the waste water treatment plant?

• Kill the pathogenic bacteria.
• Aerate the water for good bacteria to grow.
• Allow heavy materials to sink to the bottom.
• Filter the large pieces of debris.