ch 2

In humans, water comprises approximately ______ of body weight.

60-70%

When water is heated, the rate at which bonds break increases, and water molecules are converted to the state.

Blank 1: hydrogen or H Blank 2: gaseous, gas, or vapor

pH is defined as the. to the base 10 of the. ion concentration.

Blank 1: negative or - Blank 2: logarithm or log Blank 3: H+, hydrogen, H, hydronium, proton, [H+], h positive, H positive, or H plus

Which ions are produced when water ionizes? Multiple select question. OH- OH+ O2 H+ H-

OH- H+

Pure water can ionize into which of the following?

Positively charged protons (H+) and negatively charged hydroxide (OH-) ions

What part of an amphipathic molecule would be oriented toward the center of a micelle?

The nonpolar region

In a micelle, which portion of the amphipathic molecules are oriented toward the surface of the sphere?

The polar region

What happens when water freezes? Multiple select question. Water molecules are packed into a less dense formation. The rate of hydrogen bond breakage slows. The H2O molecules in ice are in a much more orderly arrangement than in the liquid state. Water loses its hydrophilic status and becomes more hydrophobic.

Water molecules are packed into a less dense formation. The rate of hydrogen bond breakage slows. The H2O molecules in ice are in a much more orderly arrangement than in the liquid state.

Hydrolysis reactions ______.

a chemical reaction that utilizes water to break apart molecules

A liquid that can dissolve substances is known as a(n)

a solvent

Living organisms minimize changes in their internal pH using compounds called ______.

buffers

The amount of solute (in grams) dissolved in a given volume of solution is the solution's ______.

concentration

Water is used to break apart another molecule in a(n) reaction.

hydrolysis or hydrolytic

Which state of water is the most dense?

liquid

Which component of humans has the greatest percent of water?

lungs

Compared with liquid water, ice has ______. Multiple select question. more hydrogen bonds between individual water molecules a less orderly arrangement of water molecules a more orderly arrangement of water molecules fewer hydrogen bonds between individual water molecules

more hydrogen bonds between individual water molecules a more orderly arrangement of water molecules

The ______ of a solution is the negative base 10 logarithm of the H+ concentration of the solution.

pH

To freeze water, energy is ______.

released

The concentration of a liquid is defined as the amount of ______ dissolved in a unit volume of solution.

solute

Substances dissolved in liquid are called ______.

solutes