AP Biology Chemistry and Enzymes

What is the pH level of an acid?

• 7.1-14
• 14-21
• 0-6.9
• 7

What is the pH level of a base?

• 7.1-14
• 0-6.9
• 14-21
• 7

A solution that keeps pH from changing.

• glucose
• carbohydrate
• monomer
• Buffer

Which of the following properties of water enables it to move from the roots to the leaves of plants?

• Water is less dense as a solid than as a liquid.
• Water has a high specific heat.
• Cohesion due to hydrogen bonding  and adhesion due to water's polar nature.
• Water is a solvent.

What property of water allows it to be such a versatile solvent that it is often called the "universal solvent?"

• Water is very pure.
• Water is polar.
• Water has surface tension.
• Water is less dense as a solid than as a liquid.

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.

molecule with the same molecular structure but different structural formula

• fats

• lipids

• fossil fuels

• isomers

which bond does carbon mostly form

• hydrogen bond

• dipole-dipole

• covalent bond

What is FALSE about the elements in group 18?

• Their valence energy levels are full.

• They are inert.

• They have eight electrons in their valence energy levels.

• They are non-reactive.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which electrons determine the behavior of an atom?

• Valence electrons

• The ones in the inner-most energy level.

• Positive electrons

• Pfluberonic electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2