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38 Cards in this Set

  • Front
  • Back

the most important factor in the evolution of life on earth is

water

a hydrogen bond is best defined as

a relatively strong elctrostatic bond between hydrogen and oxygen or nitrogen

which of the following compounds is capable of bonding with like molecuels

both c and d

which of the following is not a type of van der waals force

chemical bond

which of the following is not an example of noncovalent interactions between molecules

chemical bonds

which of the following factors is responsible for the fact that water is a liquid at room temperature

hydrogen bonds

which of the following properties of water promotes the relatively constant climate of earth

high- heath of fusion, high heat of vaporization, high heat capacity

which of the following compounds is amphipathic

ch3ch2ch2ch2ch2cooh

which of the following statements is true of weak acids dissolve in water

they are partially ionized in water

what is the pH of a solution where the concentration of hydrogen ions is 2x10^-5

4.7

which of the following would not form a suitable buffer

hydrochloric acid/ chloride

buffering capacity is directly proportional to which of the following factors

concentraction of both components of the buffer

the most important buffer in blood is

carbonate/bicarbonate buffer

when an individual breathes very rapidly, large amounts of carbon dioxide are exhaled. what effect does this have on blood pH

alkalosis


salt bridges in proteins are an example of

ionic interactions

which of the following molecules will have a dipole moment

CHCl3

which of the following molecules would form a micelle

ch3(ch2)10COO- Na+

which of the following molecules are weak acids

HCO3

which of the following ions would have the largest hydration sphere

Li+

Hydration is best defined as

Noncovalent interactions between water and a solute

the noncovalent interactions between an amide and an alcohol would be which of the following

hydrogen bonding

crenation would result when cells are placed in a ____ solution

hypertonic

which of the following is not a important noncovalent interaction of living organisms

Carbon hydrogen bonds

which of the following molecules would have unusually high heat capacities

ammonia and methyl alcohol

the hybridization of a water molecule is

SP3

the strongest type of non covalent force is

hydrogen bonds

which of the following ions would have the strongest tendency to form an ion pair with carboxylate groups the surface of a protein

potassium

which of the following species would for a buffer with HPO4^-2

H2PO4^-1

water can form how many hydrogen bonds

four

which of the following solutions will be isotonic with 3m sucrose

1 mole sodium sulfate

which of the following is hydrophobic

hexane

in biological systems buffers usually contain an excess of ____

weak base

the tendency of nonpolar molecules aggregate in water medium called

hydrophobic effect

the high heat of fusion of water is due to its

hydrogen bonding

which of the following species can form a buffer system

acetic acid/sodium acetate

which of the following are unsusual properties of water that suit it to be the matrix of life

solvent characteristics

what percent of the world water is drinkable

3%

the immediate effect of deforestation is

erosion