Lower Primary 2 - SCIENCE revision

What is a solute?

• A substance that is mixed with a solvent but does not dissolve
• A substance that separates from a solution
• A substance that is dissolved in a solvent to form a solution.
• A substance that is a type of solvent

Which is an example of a solute?

• Salt

• Oxygen

• Water

• Sugar

What is a solvent?

• A solvent is a substance that evaporates quickly.
• A solvent is a substance that solidifies a solute.
• A solvent is a substance that increases the volume of a solute.
• A solvent is a substance that dissolves a solute.

Which of the following is a solvent?

• Vinegar
• Oil
• Water
• Salt

What is a solution?

• A solution is a type of gas.
• A solution is a solid substance.
• A solution is formed when a solute is mixed into a solvent.

• A solution is a heterogeneous mixture composed of two or more substances.

Which of the following when mixed can make a solution?

• Vinegar and flour
• Sugar and oil
• Baking soda and lemon juice
• Salt and water

What is a soluble substance?

• A soluble substance is one that can be solid at room temperature.
• A soluble substance is one that cannot be dissolved in any solvent.
• A soluble substance is one that can dissolve.

• A soluble substance is one that can only be dissolved in water.

What is an insoluble substance?

• A substance that changes color when mixed with a solvent.
• A substance that evaporates quickly in a solvent.
• A substance that dissolves in any solvent.
• A substance that cannot dissolve in a solvent.

Which of the following is NOT a method of separation?

• Crystallisation

• Filtration

• Evaporation

• Hand-picking

What is hand-picking?

• Choosing something randomly
• Selecting something with a machine
• Picking something with a spoon
• Separating a mixture carefully by hand.