What makes a molecule polar?

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

Tags

NGSS.MS-PS1-1

The atoms in a CO₂ molecule are held together by _____ bonds.

• covalent

• adhesive

• ionic

• cohesive

Covalently bonded molecules are made of atoms that

• share electorns
• shoot their electrons out into space
• move their electrons to the nucleus of the atom
• give electrons to and accept electrons from each other

Tags

NGSS.MS-PS1-1

In an aqueous environment which of the following is the strongest bond?

• covalent

• ionic attraction in solution

• van der Waals

• hydrogen

Tags

NGSS.HS-PS1-4

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

• amphipathic
• hydrophobic
• polar
• nonpolar

Tags

NGSS.HS-ESS2-5

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

• density
• polarity
• solvency
• specific heat

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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.

Which of the following is not an element found in large abundance in organisms?

• Calcium
• Carbon
• Hydrogen
• Nitrogen

The elements: C H O N typically represent what proportion of an organism's element make up?

• 78%
• 68%
• 96%
• 82%

Attractions between water molecules are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds