chem-2-revision2

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

Strong electrolyte.

Weak electrolyte.

None of the above

Non-electrolyte.

None

Which of the following statements correctly describes hydration?

It involves the interaction of solvent molecules with solute particles.

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.

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

None

Which of the following correctly describes a non-electrolyte?

A substance that completely dissociates in water into ions.

A substance that conducts electricity due to ion formation.

A substance that partially dissociates into ions in solution.

A substance that dissolves in water without forming ions.

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

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

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

None

Which of the following statements is true?

Strong electrolytes only partially dissociate in water.

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

The solubility of gases in water increases with increasing temperature.

Water molecules can form hydrogen bonds due to their polarity.

None

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

Concentration.

Molarity.

Mass.

Solubility.

None

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

Decreasing both temperature and pressure.

Increasing both temperature and pressure.

Increasing the temperature and decreasing pressure.

Decreasing the temperature and increasing pressure.

None

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

CO2

NaCl.

NO3-

Ca+

None

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

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

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

Ice forms stronger ionic bonds compared to liquid water.

Ice has more dissolved oxygen molecules, making it lighter.

None

10.

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

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

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.

None