Water Properties and Polarities

The picture shows water droplets hanging on the tips of pine needles. How do the physical properties of water result in the image shown?

• Cohesion allows droplets to form, and adhesion keeps the droplets on the needles.

• Adhesion allows droplets to form, and cohesion keeps the droplets on the needles.

• Cohesion allows droplets to form, and capillary action keeps the droplets on the needles.

• Adhesion allows droplets to form, and capillary action keeps the droplets on the needles.

Which property of water molecules explains the other properties listed below?

• adhesion

• cohesion

• hydrogen bond

• surface tension

One property of water that makes it unique is its density. Which example describes a result of this property?

• Polar bear float on ice floes to hunt for food.

• Tree transport water from their roots to their leaves.

• Water strider insects walk on the surface of pond water.

• Plants receive enough light to grow under the surface of a lake.

Which statement correctly describes one way that the properties of water affect heat and temperature?

• Water retains more heat than other materials, allowing coastal regions to remain warmer in winter seasons.

• Water absorbs heat when it freezes, helping it to insulate lakes and ponds from cold temperatures.

• Water looses heat when it changes to a vapor, helping to keep animals cool through perspiration.

• Water retains less heat than other materials, keeping aquatic ecosystems cooler than those on land.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

• Water is an acid.
• Water is a versatile solvent.
• Water has a high heat capacity.
•  Water acts as a buffer.

 Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

• The insects are light enough so that 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 insects' 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

Tags

NGSS.MS-PS2-5

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

• Specific heat 
• Surface tension
• Cohesion and adhesion of water molecules 
• Formation of covalent bonds between hydrogen and oxygen molecules

What is water?

• An atom

• A molecule composed of 2 parts Oxygen and one part Hydrogen

• A molecular compound composed of 2 parts Hydrogen and one part Oxygen

• An ionic compound composed of 2 parts Hydrogen and one part Oxygen

Tags

NGSS.MS-PS1-1

What is adhesion?

• Water's ability to stick to itself
• Water's ability to stick to other substances
• The strength of the cohesion of all the water molecules combined
• Tape, glue and other adhesives

What is cohesion?

• Water's ability to stick to itself
• Water's ability to stick to other substances
• The strength of the cohesion of all the water molecules combined
• Tape, glue and other adhesives