Questions

Explanations

31 Which ion has the smallest radius?

(1) O^2-

(2) S^2-

(3) Se^2-

(4) Te^2-

32 Equal amounts or ethanol and water are mixed at room temperature and at 101.3 kPa. Which process is used to separate ethanol from the mixture?

(1) distillation

(2) reduction

(3) filtration

(4) ionization

• melting point or 9811 K

• hard. brittle solid at room temperature

• poor conductor of heat and electricity as a solid

• good conductor of electricity as a liquid or in an aqueous solution

This sample is classified as

(1) a metallic element

(2) a radioactive element

(3) a molecular compound

(4) an ionic compound

34 Given the balanced equation representing reaction:

N₂ + energy ==> N + N

Which statement describes this reaction?

( I) Bonds are broken, and the reaction is endothermic.

(2) Bonds are broken , and the reaction is exothermic.

(3) Bonds are formed, and the reaction  is endothermic.

(4) Bonds are formed, and the reaction  is exothermic.

35 When lithium reacts with bromine to form the compound LiBr each lithium atom

(1) gains one electron and becomes a negatively charged ion

(2) gains three electrons and becomes a negatively charged ion

(3) loses one electron and becomes a positively charged ion

(4) loses three electrons and becomes a positively charged ion

36 A beaker with water and the surrounding air are all at 24°C. After ice cubes are placed in the water, heat is transferred from

(2) the beaker to the air

(3) the water to the ice cubes

(4) the water to the beaker

37 A sample of chlorine gas is at 300. K and 1.00 atmosphere. At which temperature and pressure would the sample be have more like an ideal gas?

(1) 0 K and 1.00 atm

(2) 150. K and 0.50 atm

(4) 600. K and 0 .50 atm

Like an ideal vacation

38 When a sample of a gas is heated in a sealed, rigid container from 200. K to 400. K, the pressure exerted by the gas is

(1) decreased by a factor of 2.

(2) increased by a factor of 2.

(3) decreased by a factor of 200.

(4) increased by a factor of 200.

Kelvin temp doubles so does pressure

Which elements are present in this mixture?

( I) A and D       (3) Z and D

(2) Aand X        (4) Z and X

40 The graph below represents the relation ship between time  and temperature as heal is added at a constant rate to a sample or a substance.

During interval AB, which energy change occurs for the particles in this sample?

( l ) The potential energy or the particles increases.

(2) The potential energy or the particles decreases.

(3) The average kinetic energy of the particles increases.

(4) The average kinetic energy or the particles decreases.

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