4C Physical changes - Dissolving

What type of water will dissolve a substance faster?

• Cold

• Warm

• Hot

True or false...

When a substance dissolves it is a chemical reaction.

• true

• false

True or false...

When a substance melts it is a physical change.

• true

• false

Which of the following factors DOES NOT effect solubility?

• Temperature

• Stirring (agitation)

• Colour

• Surface Area of solute (size)

What could you do to allow more solute to be dissolved in a solvent?

• add more solute

• evaporation

• cool the solution

• heat the solution

Lonnie stirred some sugar into a jug of lemon squash.

What happened to the sugar?

• The sugar floated to the top surface

• The sugar disappeared after it was stirred.

• The sugar dissolved in the lemonade

• The sugar all settled to the bottom of the pitcher

Is wood burning a physical change or chemical reaction?

• Physical

• Chemical

Is milk going sour a physical change or chemical reaction?

• Physical

• Chemical

What is a solvent?

• The liquid part - the substance that does the dissolving in a solution.

• The solid part - the substance that is being dissolved in a solution.

• The mixing of different substances.

• The process of adding or removing electrons

What is the SOLID part of a solution that has been dissolved?

• Solute

• Solvent

• Solution

• Mixture