Water Properties

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

The tightness across the surface of water that enables paper clips to float is ____________.

• adhesion

• capillary action

• surface tension

• polarity

Which statement explains why water molecules stick together?

• both sides are negative

• one side has a positive charge and the other side has a negative charge

• one side has a negative charge adn the other side has a neutral charge

• both sides are positive

When a molecule has an opposite electrical charge on each end, it is known as what?

• cohesion

• polar molecule

• hydrogen bond

• solution

When water molecules stick easily to other water molecules, this is called what?

• cohesion

• adhesion

• solution

• polar molecule

Tags

NGSS.MS-ESS2-4

Why does water move from the roots to the leaves of plants?

• Water is pushed by solutes

• Water is pulled by gravity

• Capillary action pulls the water molecules like a chain

• Water's cohesion causes it to "pull" towards the leaves

Water has an unusually high specific heat. What does this mean?

• At its boiling point, water changes from liquid to vapor.

• A large amount of heat is required to raise the temperature of water.

• Ice floats in liquid water.

• Salt water freezes at a lower temperature than pure water.

• Floating ice can insulate bodies of water.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

What word describes when water is attracted to other substances?

• cohesion

• adhesion

• capillary action

• surface tension

Why does ice float?

• As water freezes, it expands and its density decreases.

• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

What property of water allows it to dissolve many substances?

• A) Cohesion

• B) Adhesion

• C) Polarity

• D) Surface tension