Understanding Solubility and Electrolytes in Chemistry

What does the term 'insoluble' mean in chemistry?

• A liquid that can mix with water

• A gas that reacts with water

• A substance that cannot dissolve in a particular solvent

• A substance that can dissolve in any solvent

Which salt did not dissolve at any temperature in the classroom experiment?

• Ammonium chloride

• Potassium nitrate

• Sodium chloride

• Calcium sulfate

At what temperature did potassium nitrate completely dissolve in the experiment?

• 45 degrees Celsius

• 30 degrees Celsius

• 20 degrees Celsius

• 5 degrees Celsius

What does a solubility curve represent?

• The time it takes for a solute to dissolve

• The dependency of solubility on the amount of solute

• The relationship between solute and solvent at constant temperature

• The dependency of solubility on temperature

What is the effect of temperature on the solubility of gases in water?

• Only high temperatures increase solubility

• Temperature increase leads to higher solubility

• Temperature decrease leads to higher solubility

• Temperature has no effect on solubility

What is a supersaturated solution?

• A solution with the maximum amount of solute dissolved at a specific temperature

• A solution that contains more dissolved solute than it can normally hold at a given temperature

• A solution that can dissolve more solute

• A solution that rapidly crystallizes

What happens during the crystallization of a supersaturated solution?

• The solution heats up

• The solute precipitates out rapidly

• The solution becomes clear

• The solute dissolves further

Which type of compound is sodium chloride classified as when dissolved in water?

• Insoluble substance

• Strong electrolyte

• Weak electrolyte

• Non-electrolyte

Why are sports drinks advertised to replenish electrolytes?

• They increase hydration

• They replenish ions lost through sweat

• They replenish fluids only

• They replenish energy

What is the primary reason some solutes do not dissolve in certain solvents?

• Mismatch of intermolecular forces

• Excess solute

• Presence of impurities

• Lack of heat