AP Biology (Midterm - Winter '24)

Which of the following is NOT one of the six elements that make up 96% of living matter?

• Sodium

• Oxygen

• Carbon

• Phosphorous

An atom of carbon with 6 neutrons and an atom of carbon with 7 neutrons are considered what?

• Isomers

• Isotopes

• Radioactive

• Ions

What quality leads atoms to interact and form polar covalent bonds?

• Equal electronegativities

• High electronegativities

• Unequal electronegativities

• Low electronegativities

Tags

NGSS.HS-PS1-1

When two atoms are equally electronegative, they will interact to form:

• Non-polar covalent bonds

• Ionic bonds

• Polar covalent bonds

• Hydrogen bonds

In a single molecule of water, what bond attracts the hydrogen atoms to the oxygen atom?

• Hydrogen bond

• Polar covalent bond

• Non-polar covalent bond

• Ionic bond

What force attracts water molecules to other water molecules?

• Hydrogen bond

• Polar covalent bond

• Non-polar covalent bond

• Ionic bond

Why is water a bent molecule?

• Unequal electronegativities of H atoms and the O atom

• Ionic bonding between the H atoms and the O atom

• Equal electronegativities of H atoms and the O atom

• Hydrogen bonding between the H atoms and the O atom

Which property of water allows this bug to walk on water?

• Cohesion

• Adhesion

• Solid water is less dense than liquid water

• High specific heat

When H bonds break and form, they absorb and release heat. This leads to:

• Water's high specific heat

• Water's high heat of vaporization

• The polarity of water

• Water being a "universal" solvent

Why does solid water float in liquid water?

• Air bubbles in the ice make it less dense

• The water molecules in ice are spread further apart

• The covalent bonds of ice make each atom more spread out

• Solid water is more dense than liquid water