Chapter 5 Pre Flashcards
The molecules that make up plasma membranes are amphipathic which means…
they have both hydrophobic and hydrophilic regions
The oxygen in a water molecule has a slight positive charge.
T or F
F
Molecules that can dissolve in water are called _________________.
hydrophilic
The hydrogen atom in a water molecule has a slight positive charge.
T or F
T
The chemical bonds between hydrogen and oxygen in a water molecule are ____________ bonds.
Select all
polar covalent
A solvent is _________________.
something that is capable of dissolving another substance
Substances that interact readily with water are __________________ and substances that repel water are _____________ .
hydrophilic
Hydrophobic
If you were to add a large amount of H2SO4 to water, the pH of the solution would:
H2SO4 ↔︎ H+ + HSO4-
Decrease
Given the following chemical reaction, is NH3 an acid or a base?
NH3 + H2O ↔︎ NH3+ + OH-
Base
Water retains a lot of heat, which is important for keeping homeothermic (“warm-blooded”) animals at the correct temperature to maintain life. This is due to which property of water?
its high specific heat capacity
Water molecules sticking to each other is called _________
; water molecules sticking to other polar or charged molecules is called _________
cohesion
adhesion
When sodium chloride (NaCl) is dissolved in water, what happens? (select ALL)
Na+ interacts with the partially negative oxygens of water
Cl- interacts with the partially positive hydrogens of water
Na+ and Cl- dissociate
Changing the pH can cause a protein to:
unfold
Atoms with a full outer electron shell will form chemical bonds with other atoms.
T or F
F
How many covalent bonds can each form?
H
O
N
C
H: 1
O: 2
N: 3
C: 4
