A) Why is butter so difficult to wash off your hands with just water? butter, a

Question

A)

Why is butter so difficult to wash off your hands with just water?

butter, a lipid, is polar and hydrophilic

butter, a lipid, is polar and hydrophobic

butter, a lipid, is nonpolar and hydrophlic

butter, a lipid, is nonpolar and hydrophobic

B)

Benedict's reagent turns dark blue in the presence of monosaccharides. Which of the following would cause Benedict's to turn dark blue?

Glucose

Albumin

Cellulose

DNA

both glucose and cellulose

C) All of the following molecules are organic except

C6H12O6

MgCl2

CHNO3

CH4

D)

You are looking at a series of blocks whose surface area to volume ratio you have calculated. Which will have the fastest rate of diffusion of substances into the center of the block?

surface area to volume ratio of 10

surface area to volume ratio of 5

surface area to volume ratio of 2

surface area to volume ratio of 0.1

butter, a lipid, is polar and hydrophilic

butter, a lipid, is polar and hydrophobic

butter, a lipid, is nonpolar and hydrophlic

butter, a lipid, is nonpolar and hydrophobic

Explanation / Answer

a) butter, a lipid, is nonpolar and hydrophobic

Butter dissolves in oils and is lipophilic and does not dissolve in water. Thus, it is nonpolar and hydrophobic.

b) Glucose

Glucose is the only monosaccharide given. Albumin is protein, cellulose is a polysachharide and DNA is nucleic acid.

c) MgCl2

Organic molecules are made of carbon with different number of carbon-hydrogen bonds. Since MgCl2 does not contain chain of carbon and carbon hydrogen bond therefore, it is not an organic molecule.

d) surface area to volume ratio of 10

Larger surface area means faster rate of diffusion and it will reach to the center of the block fastest. Therefore, the answer will be 10.

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