Homework Sourse27 Hbonds a hold hydrophobic portions of integral proteins i
27. H-bonds….
a. hold hydrophobic portions of integral proteins in bilipid layers
b. cause the polarity of water molecules
c. increase the cooling effect of water evaporation
d. increase the cooling effect of water conduction
e. more than one of the above
4. Hydrogen bonds …
a. form between oxygens and hydrogens of adjacent water molecules
b. form between oxygen and hydrogen within the same water molecule
c. form between hydrogens of adjacent water molecules
d. from between oxygens of adjacent water molecules
35. Water molecules tend to bind to each other due to…
a. covalent attractions between hydrogens and oxygens of adjacent molecules
b. small charges on the water molecule\'s surface caused by polar covalent bonding
within each molecule of water
c. the colligative properties of water
d. the electronegativity of the water molecule
4. Dissolving solute in water increases the boiling point of the solution. This is due to ...
a. adhesion b. cohesion c. heat capacity d. colligative properties
5. Plasma, the liquid portion of the blood has a higher boiling point than pure water. This is due to.....
a. H-bonding and the specific heat of water b. plasma has many dissolved solutes
c. blood is thicker than water d. denaturation of proteins in blood
Solution
27. Answer is b: Hydrogen bonds or interactions are formed by the partially charged atoms or molecules. Partial charges are generated due to Dipole moment. Intern dipole moment is due to the presence of different electro negative atoms in the molecule.
4. Answer is a: form between oxygens and hydrogens of adjacent water molecules. Due to dipole moment, oxygen get partial negative charge and hydrogen get partial positive charge. Polarised oxygen of one water molecule form hydrogen interactions with polarized hydrogen atom of another water molecule and form inter molecular hydrogen interactions. These are the responsible for liquid nature of water. During evaporation at 1000C these interactions breakdown.
35. Answer is b: small charges on the water molecule\'s surface caused by polar covalent bonding within each molecule of water
4. Answer is D: Dissolving solute in water increases the boiling point of the solution called Elevation of Boiling point. It is a type of Colligative property. Colligative properties are quantitative properties of the solutions, in which depends only on number but not nature of the molecules. Eg. Osmosois, Elevation of boiling point, Depression in freezing point etc.
5. Answer is b: plasma has many dissolved solutes. So boiling point is more or elivated
