3rd LE

Question 1

The calorimeter is a device used to measure * that accompany a physical or a chemical process.

Answer 1

heat changes

Question 2

The * measured from a process conducted under * is referred to as enthalpy,

Answer 2

heat, constant pressure

Question 3

Retention factor: * parameter
B. Basis of separation: *
C. Stationary phase: *
D. Type of system: *

Answer 3

qualitative
Polarity
water adsorbed in the chromatographic paper
Close

Question 4

Chromatography is technique used to separate components of a mixture based on differences in *

Answer 4

intermolecular forces of attraction

Question 5

Paper chromatography is a chromatographic technique where the stationary phase is the * while the mobile phase is the * which can either be polar or nonpolar.

Answer 5

water bound to the cellulose of the paper

solvent

Question 6

Given a specific stationary and mobile phase, a component will always have the * retention factor (Rf). The retention factor is defined as the * which is retained in the *

Answer 6

same
fraction of a component
mobile phase

Question 7

endothermic (ΔHsoln = +),
exothermic (ΔHsoln = -)
* (ΔHsoln = 0).
This value will be dependent on the relative strengths of the * between like and unlike particles

Answer 7

athermic

interparticle forces of attraction

Question 8

Stronger forces of attraction between unlike particles result in an overall * in the volume of solution; otherwise an overall * in the volume of solution is observed.

Answer 8

contraction

expansion

Question 9

Glycerol – *

Naphthalene – *

Answer 9

polar

nonpolar

Question 10

chromatography (based on differences in * and ability to be * ), and distillation (based on differences in * or * of the mixture components)

Answer 10

solubility, adsorbed

volatility, boiling point

Question 11

simple distillation, which is typically used for two * liquids with boiling points that are * and far from each other.

Answer 11

miscible, below 150 °C

Question 12

• (for isopropyl alcohol) or about * (for ethyl alcohol).

Answer 12

82 to 84 °C

78 to 80 °C

Question 13

where Ptrapped air is the pressure of gas * , Pbar is the *

Answer 13

trapped in the eudiometer

barometric pressure

Question 14

For all cases, the pressure of gas produced in dry conditions can be calculated as

Answer 14

𝑃𝑑𝑟𝑦 𝑎𝑖𝑟 = 𝑃𝑡𝑟𝑎𝑝𝑝𝑒𝑑 𝑎𝑖𝑟 − 𝑃𝑤𝑎𝑡𝑒𝑟 𝑣𝑎𝑝𝑜𝑟

Question 15

Colligative properties are properties of solutions which depend on the * of the * solutes

Answer 15

concentration, non-volatile

Question 16

One of the general properties of acids and bases is their ability to * acids and bases, respectively, from their corresponding salts

Answer 16

displace weaker