Question 1

Which type of intermolecular force exists between all molecules, whether polar or nonpolar?

Accepted Answer

London dispersion forces

Answer

Ionic bonding

Answer

Hydrogen bonding

Answer

Dipole-dipole forces

Question 2

Which of the following has hydrogen bonding between its molecules?

Accepted Answer

H₂O

Answer

CO₂

Answer

CH₄

Answer

NaCl

Question 3

Which substance would have the highest boiling point due to strong intermolecular forces?

Accepted Answer

NH₃

Answer

CH₄

Answer

CO₂

Answer

H₂

Question 4

What causes dipole-dipole forces?

Accepted Answer

Attraction between oppositely charged ends of polar molecules

Answer

Attraction between ions and polar molecules

Answer

Movement of electrons between atoms

Answer

Instantaneous temporary dipoles

Question 5

The weak forces between nonpolar molecules are called:

Accepted Answer

London dispersion forces

Answer

Hydrogen bonds

Answer

Covalent bonds

Answer

Metallic bonds

Question 6

The process by which a solid changes directly into a gas is called:

Accepted Answer

Sublimation

Answer

Vaporization

Answer

Deposition

Answer

Condensation

Question 7

When water freezes, it:

Accepted Answer

Releases heat

Answer

Maintains heat

Answer

Neither absorbs nor releases heat

Answer

Absorbs heat

Question 8

Which of the following phase changes is endothermic?

Accepted Answer

Evaporation

Answer

Deposition

Answer

Condensation

Answer

Freezing

Question 9

The temperature at which a liquid changes to a gas is called:

Accepted Answer

Boiling point

Answer

Freezing point

Answer

Melting point

Answer

Critical point

Question 10

What happens to the kinetic energy of particles during melting?

Accepted Answer

It increases

Answer

It becomes zero

Answer

It remains constant

Answer

It decreases

Question 11

What is the unit of molarity (M)?

Accepted Answer

mol/L

Answer

mol/kg

Answer

g/L

Answer

g/mol

Question 12

How many moles of solute are present in 2.0 L of a 0.5 M NaCl solution?

Accepted Answer

1 mol

Answer

50 mol

Answer

25 mol

Answer

0 mol

Question 13

Which of the following will increase the rate at which a solid dissolves in a liquid?

Accepted Answer

Stirring the solution

Answer

Using larger solute particles

Answer

Adding more solvent

Answer

Lowering the temperature

Question 14

When a solution contains the maximum amount of solute at a given temperature, it is:

Accepted Answer

Saturated

Answer

Concentrated

Answer

Unsaturated

Answer

Dilute

Question 15

A 250 mL solution contains 10 g of NaOH (M = 40 g/mol). What is its molarity?

Accepted Answer

1 M

Answer

50 M

Answer

25 M

Answer

0 M

Question 16

Colligative properties depend on:

Accepted Answer

The number of solute particles

Answer

The color of the solution

Answer

The chemical nature of the solvent

Answer

The type of solute particles

Question 17

Adding salt to water causes its boiling point to:

Accepted Answer

Increase

Answer

Stay the same

Answer

Decrease

Answer

Drop to 0°C

Question 18

The freezing point of a solution compared to that of a pure solvent is:

Accepted Answer

Lower

Answer

Higher

Answer

Unchanged

Answer

The same

Question 19

Which of the following solutes would cause the greatest freezing point depression when dissolved in water?

Accepted Answer

CaCl₂

Answer

NaCl

Answer

Glucose (C₆H₁₂O₆)

Answer

CH₃OH

Question 20

Boiling point elevation and freezing point depression are both examples of:

Accepted Answer

Colligative properties

Answer

Solution saturation

Answer

Chemical reactions

Answer

Physical constants

Question 21

The study of energy changes during chemical reactions is called:

Accepted Answer

Thermochemistry

Answer

Kinetics

Answer

Thermodynamics

Answer

Calorimetry

Question 22

An exothermic reaction is one in which:

Accepted Answer

Heat is released

Answer

No energy is exchanged

Answer

Temperature decreases

Answer

Heat is absorbed

Question 23

Which of the following represents an endothermic process?

Accepted Answer

Photosynthesis

Answer

Condensation of steam

Answer

Combustion of fuel

Answer

Freezing of water

Question 24

The unit of heat in the SI system is:

Accepted Answer

Joule

Answer

Watt

Answer

Newton

Answer

Calorie

Question 25

In a reaction where ΔH = –120 kJ, the reaction is:

Accepted Answer

Exothermic

Answer

Neutral

Answer

Isothermal

Answer

Endothermic

Question 26

The rate of a chemical reaction refers to:

Accepted Answer

The change in concentration per unit time

Answer

The energy released

Answer

The total mass of reactants

Answer

The amount of product formed

Question 27

Increasing the temperature of a reaction usually:

Accepted Answer

Speeds up the reaction

Answer

Has no effect

Answer

Slows the reaction

Answer

Stops the reaction

Question 28

A catalyst works by:

Accepted Answer

Lowering activation energy

Answer

Increasing product stability

Answer

Increasing reaction temperature

Answer

Increasing activation energy

Question 29

Which of the following does not affect reaction rate?

Accepted Answer

Color of reactants

Answer

Concentration

Answer

Pressure

Answer

Temperature

Question 30

Grinding a solid reactant into powder increases reaction rate because it:

Accepted Answer

Increases surface area

Answer

Decreases energy of molecules

Answer

Decreases surface area

Answer

Increases activation energy

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