Which type of chemical bond is formed when electrons are shared and is a stronger bond that is not easily broken?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Van der Waals force

Which type of water property explains water's ability to stick to other material.

• Cohesion

• Surface tension

• Adhesion

• High specific heat

Tags

NGSS.HS-ESS2-5

A material is hydrophobic, that means it...

• Doesn't mix with water or dissolve in water easily

• Mixes with water or dissolves in water easily

Water is...

• Polar

• Nonpolar

Tags

NGSS.HS-ESS2-5

What makes a molecule polar?

• Equal sharing of valence electrons
• Unequal sharing of valence electrons
• Stealing of electrons
• Temporary charges that come and go

Water molecules require a lot of energy to break the hydrogen bonds.  This gives water a high

• density
• polarity
• solvency
• specific heat

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Because water has a positively charged end and a negatively charged end, it can be described as

• amphipathic
• hydrophobic
• polar
• nonpolar

Tags

NGSS.HS-PS1-3

Which of the following properties of water enables molecules to cling together as they move from the roots to the leaves of plants?

• Water expands as it freezes.
• Water is an excellent solvent.
• Water exhibits cohesive behavior.
• Water moderates temperature.

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

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

Tags

NGSS.HS-ESS2-5

Some insects can stand on 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
  

Tags

NGSS.MS-PS2-5