Biology Chapter 3 Test

the slight negative charge at one end of the one water molecule is attracted to the slight positive charge of another water molecule. what is this attraction called

a hydrogen bond

in a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by

a polar covalent bond

which of the following effects is produced by the high surgface tension of water

a water strider can walk across the surface of a small pond

waters high specific heat is mainly a consequence of the

absorption and release of heat when hydrogen bonds break and form

when an ionic compound such as sodium chloride (NaCl) is placed in water the component atoms of the NaCl crystal dissocates into

...

what is the hydroxide ion concentration of the lake described in question 7

10-10

measurements show that the pH of a particular lake is 4.0 What is the hydrogen ion concentration of the lake?

10-4

how many grams of acetic acid (C2H4O2) would you use to make 10 L of a 0.1 M aqueous solution of acetic acid?

60.0g

a given solution contains 0.0001 (10-4) moles of hydrogen ions [H+] per liter. Which of the following best describes this solution

acidic; H+ donor

carbon dioxide (CO2) is readily soluble in water, according to the equation CO2 + H2O -> H2CO3 Carbonic acid (H2CO3) is a weak acid. Respiring cells release CO2. What prediction can we make about the pH of blood as that blood first comes in contact with respiring cells?

blood pH will decrease slightly

the molefular mass of glucose is 180 g. Which of the following procedures should you carry out to make 1 M solution of glucose

dissolve 180 g of glucose in water, and then add more water until the total volume of the solution is 1 L

buffers are substances that help resist shifts in pH by

donation h+ to a solution when they have been depleted, accepting H+ when the are in excess

which of the following solutions has the greatest concentration of hydrogen ions [H+]

gastric juice at pH 2

what gives rise to the coheasiveness of water molecules

hydrogen bonds

the bonds that are broken when water vaporizes

hydrogen bonds between water molecules

what is the pH of a solution with a hydrogen ion [H+] concentration of 10-8

pH8

which of the following solutions has the greatest concentration of hydroxyl ions [OH-]

seawater at pH8

one of the buffers that contribute to pH stability in human blood is the carbonic acid (H2CO3). Carbonic acid is a weak acid that dissocates into a bicarbonate ion (HCO3-) and hydrogen ion (H+) thus

the HCO3- to act as a base and remove excess H+ with the fomation of H2CO3

many mammals control their body temperature by sweating. which property o water is most directly responsible for the ability of sweat to lower body temperature

the absorption of heat by the breaking of hydrogen bonds

Which of the following statements correctly defines a kilocalorie

the amount of heat required to raise the temperature of 1kg of water by 1 degree C

Water is able to form hydrogen bonds because

the bonds that hold together the atom in water molecules are polar covalent bonds

which of the following statements is true about buffer solutions

they maintain a relatively constant pH when ether acids or bases are added to them

which of the following is a hydrophobic material

wax