2.1 Dissolving

What is a solution?

• A mixture of two or more substances

• A pure substance that cannot be separated into simpler substances

• A homogeneous mixture of two or more substances

• A heterogeneous mixture of two or more substances

When sugar is dissolved in water, what is the sugar called?

• Solvent

• Solute

• Dissolvent

• Suspension

What is the name of the substance that the solute dissolves into?

• Solute

• Solvent

• Solution

• Dissolvent

What happens to the sugar particles when they dissolve in water?

• They disappear completely

• They remain as large, visible particles

• They spread out among the water particles

• They form a suspension

Why are solutions transparent?

• Because the solute and solvent particles are the same size

• Because the solute particles are too small to see

• Because the solvent particles are too small to see

• Because solutions do not contain any particles

Which of the following is an example of an opaque liquid, not a solution?

• Saltwater

• Lemonade

• Milk

• Copper sulfate solution

How does dissolving differ from melting?

• Dissolving requires a solute and a solvent, while melting only requires one substance

• Melting results in a homogeneous mixture, while dissolving results in a heterogeneous mixture

• The mass is conserved during dissolving but not during melting

• Dissolving happens at the particle level, while melting happens at the macroscopic level

What is true about the mass of a solution?

• The mass of the solution is greater than the combined mass of the solute and solvent

• The mass of the solution is less than the combined mass of the solute and solvent

• The mass of the solution equals the combined mass of the solute and solvent

• The mass of the solution cannot be determined without knowing the individual masses

Which of the following is a characteristic of a solution?

• It is a heterogeneous mixture

• It contains visible particles of the solute

• It has a variable composition

• It is a transparent, single-phase mixture

Why do the sugar particles no longer appear visible after dissolving in water?

• The sugar molecules have been destroyed

• The sugar has sunk to the bottom of the container

• The sugar particles have become too small to see

• The sugar has evaporated from the solution