Solubility, Dissociation, and Spectator Ions

What does it mean when a compound is soluble?

• It floats on the surface

• It dissolves in a solvent

• It sinks to the bottom

• It changes colour

What is the solute in a solution of saltwater?

• Water

• Salt

• Both water and salt

• Neither

What is the solvent in a solution of sugar dissolved in water?

• Sugar

• Water

• Sugar and water

• The air

What happens during dissociation?

• Covalent bonds break

• Ionic compounds split into ions in solution

• Solvent turns into gas

• Solid particles get bigger

Which of these compounds will dissociate into K⁺ and NO₃⁻ ions in water?

• KNO₃

• KCl

• • K₂SO₄

• KOH

True or False: All nitrates (NO₃⁻) are soluble in water.

• True

• False

What are spectator ions?

• Ions that change into new substances

• Ions that form the precipitate

• Ions that do not change and stay dissolved

• Ions that evaporate

Why do we use solubility rules?

• To know if something will dissolve or form a precipitate

• • To find the mass of a compound

• To measure the temperature of water

• To balance chemical equations

According to the solubility rules, which compound is insoluble?

• NaCl

• KNO₃

• BaSO₄

• K₂CO₃

If you mix BaCl₂ and Na₂SO₄, what solid (precipitate) will form?

• BaSO₄

• NaCl

• BaCl₂

• Na₂SO₄