Chemical behaviours​

What process should learners be able to describe that involves the separation of substances using electricity?

• Filtration

• Electrolysis

• Distillation

• Sedimentation

Learners should be able to describe the reactions of which materials with acids and alkalis?

• Plastics and polymers

• Metals and alloys

• Gases and liquids

• Ceramics and glasses

What is the function of a cell in a battery?

• To store electrical energy

• To convert chemical energy into electrical energy

• To separate different metals

• To generate light energy

What are the two different metals in a simple cell known as?

• Electrolytes

• Batteries

• Cells

• Electrodes

What is the substance called that separates the two different metals in a simple cell?

• Electrode

• Battery acid

• Electrolyte

• Conductor

In a simple cell, how do electrons flow between the metals?

• From the less reactive metal to the more reactive metal

• From the positive electrode to the negative electrode

• From the more reactive metal to the less reactive metal

• From the electrolyte to the electrodes

What is a characteristic of primary cells?

• They have low energy density and are rechargeable.

• They contain fluid inside and have low internal resistance.

• They have high power density and are not rechargeable.

• They are made of molten salts and have reversible chemical reactions.

What is true about the chemical reaction in secondary cells?

• It is irreversible and produces high power density.

• It is reversible and the cells are made of dry materials.

• It is reversible and the cells have low internal resistance.

• It is irreversible and the cells have high internal resistance.

Why are primary cells also known as dry cells?

• Because they are made of dry materials and have reversible chemical reactions.

• Because they have no fluid inside and the chemical reaction is irreversible.

• Because they are made of molten salts and have low internal resistance.

• Because they have high energy density and are rechargeable.

What distinguishes secondary cells from primary cells in terms of internal resistance?

• Secondary cells have higher internal resistance than primary cells.

• Secondary cells and primary cells both have high internal resistance.

• Secondary cells have lower internal resistance than primary cells.

• Secondary cells and primary cells both have low internal resistance.