Question

1.Pentane (C5H12) has a surface tension of 1.61 x 10 ^ -2, while ethanol (C2H5OH) has a surface tension of 2.23 x 10 ^ -2, which would have the highest viscosity?

A) pentane

B) ethanol

C) both have the same viscosity

D) cannot be determined with the information provided

2.Which of the following is true for surface tension?

l is a measure of the surface area exposed by the liquid

ll increases with increasing intermolecular attraction forces

lll decreases with increasing intermolecular attractions

A) ll and lll

B) l and lll

C) l and ll

D) l, ll and lll

3.The pressure exerted by the vapor on the surface of its liquid increases when the temperature _________ and the intermolecular forces _______.

A) increase / increase

B) increase / decrease

C) decrease / increase

D) decrease / decrease

4.In which of the following the vapor pressure in equilibrium with its liquid is higher

A) C2H5OH at 25C

B) C2H5OH at 50C

C) C2H6 at 25C

D) C2H6 at 50C

Answer 1

1.Pentane (C5H12) has a surface tension of 1.61 x 10 ^ -2, while ethanol (C2H5OH) has a surface tension of 2.23 x 10 ^ -2, which would have the highest viscosity?

B) ethanol

2.Which of the following is true for surface tension?

C) l and ll

3.The pressure exerted by the vapor on the surface of its liquid increases when the temperature _________ and the intermolecular forces _______.

B) increase / decrease

4.In which of the following the vapor pressure in equilibrium with its liquid is higher

D) C2H6 at 50C