chem-2-revision2

Which of the following correctly describes a non-electrolyte?

A substance that dissolves in water without forming ions.

A substance that partially dissociates into ions in solution.

A substance that completely dissociates in water into ions.

A substance that conducts electricity due to ion formation.

None

Which of the following is the best explanation for why polar substances dissolve in water?

They form hydrogen bonds or ion-dipole interactions with water, stabilizing their dissolved state.

They form hydrogen bonds or ion-dipole interactions with water molecules.

They form dipole-dipole interactions with water molecules, allowing dissolution.

They interact with water molecules through electrostatic forces, enabling dissolution.

None

Which of the following best explains why NaCl dissolves in water?

Water molecules react chemically with NaCl to form new covalent bonds.

Water molecules stabilize the dissociated Na+ and Cl- ions via ion-dipole interactions.

Water molecules repel Na+ and Cl- ions, causing them to separate.

Water molecules form hydrogen bonds with Na+ and Cl- ions.

None

The __________ of a solution describes the amount of solute dissolved in a given volume of solvent.

Concentration.

Solubility.

Mass.

Molarity.

None

Which of the following statements is true?

Strong electrolytes only partially dissociate in water.

The solubility of gases in water increases with increasing temperature.

Water molecules can form hydrogen bonds due to their polarity.

Non-polar substances dissolve easily in water due to hydrogen bonding.

None

Which of the following compounds is classified as a strong electrolyte?

NO3-

NaCl.

CO2

Ca+

None

Which of the following best describes why ice is less dense than liquid water?

Water molecules in ice are closer together than in liquid water.

Ice has more dissolved oxygen molecules, making it lighter.

Ice forms stronger ionic bonds compared to liquid water.

Water molecules in ice form a more open hydrogen-bonded structure.

None

A substance that dissolves in water without forming ions is known as a __________.

Weak electrolyte.

None of the above

Strong electrolyte.

Non-electrolyte.

None

Which of the following statements correctly describes hydration?

It involves the interaction of solvent molecules with solute particles.

It only occurs when a solute is fully soluble in water.

It refers to the ability of water molecules to surround and stabilize dissolved ions.

It refers to the breaking of covalent bonds within a solute.

None

10.

Which of the following factors increases the solubility of a gas in water?

Increasing both temperature and pressure.

Decreasing the temperature and increasing pressure.

Decreasing both temperature and pressure.

Increasing the temperature and decreasing pressure.

None