5.07 Chemical behaviours

What converts chemical energy into electrical energy in a battery?

• Electrolyte

• Cell

• Electrode

• Circuit

Which type of cell has a high power density and is known as a dry cell?

• Primary cell

• Secondary cell

• Quaternary cell

• Tertiary cell

What is the process called where ionic substances become disassociated when an electric current is passed through it?

• Galvanization

• Anodising

• Electrolysis

• Electroplating

During electrolysis, where do positively charged ions (cations) move?

• Remain stationary

• Through the circuit

• To the negative electrode (cathode)

• To the positive electrode (anode)

What is the purpose of electroplating?

• To increase electrical conductivity

• To improve aesthetics and reduce corrosion

• To make the object magnetic

• To increase the weight of the object

What is the main use of anodising?

• To decrease the thickness of the oxide layer

• To prepare the metal for painting

• To clean the metal surface

• To increase the thickness of the natural oxide layer

What is the reaction formula when a metal reacts with an acid?

• metal + acid → salt + oxygen

• metal + acid → salt + carbon dioxide

• metal + acid → salt + hydrogen

• metal + acid → salt + water

Which metal is the most reactive according to the reactivity series provided?

• Gold

• Copper

• Iron

• Potassium

What does galvanic cathodic protection involve?

• Applying a plastic coating to the metal

• Using a more reactive metal to protect a less reactive one

• Using a less reactive metal to protect a more reactive one

• Using electrolysis to coat the metal

What determines whether an alloy reacts with an acid or alkali?

• The reactivity of the elements within the alloy

• The weight of the alloy

• The color of the alloy

• The temperature of the alloy