WorksheetsElectrochemistry Form 5 Science KSSM
Total questions: 12
Worksheet time: 6mins
Which of the following is true about an electrolyte?
I Electrolyte conducts electricity in molten state.
II Electrolyte conducts electricity in solid state.
III Electrolyte is soluble in water.
IV Electrolyte undergoes chemical decomposition when it conducts electricity.
I and II only
II and III only
II and IV only
I and IV only
What is formed at carbon electrode Q?
Hydrogen gas
Oxygen gas
Iron metal
Nitrogen gas
The electrolysis of aqueous sodium nitrate using carbon electrode was carried out in a lab. Which of the following is true about this experiment?
The sodium ions are discharged at the cathode.
The nitrate ions are discharged at the anode.
Hydrogen gas is produced in the anode
Oxygen gas is produced in the anode.
What need to be changed in order to get different gas from this experiment?
Substitute carbon electrodes with copper electrodes.
Use a more concentrated copper (II) chloride solution.
Change the position of the battery.
Substitute carbon electrodes with platinum.
Which of the following are the factors that determine the type of ions to be discharged at the electrodes?
I Type of electrode used.
II Concentration of ions in the solution.
III The molecular mass of the atom used.
IV Position of ions in electrochemical series.
I, II and III only
I, II and IV only
I, III and IV only
II, III and IV only
Jenny wants to make her ring more beautiful and prevent corrosion. What is the best way to achieve this?
Dip the ring in oil.
Wash the ring with soap.
Plate the ring with gold.
Polished the ring with water.
Which of the following ions present in the copper(II) sulphate solution?
Cu2+, SO42-, H+ and OH- ions
Cu2+ and SO42- ions
H+ and OH- ions
Cu2+ and H+ ions
Diagram shows an electrolytic circuit using solid sodium chloride. The bulb in the circuit does not light up.
Which of the following changes would cause the bulb to light up?
Add more solid sodium chloride into the beaker
Add water to the solid sodium chloride
Add ethanol to the solid sodium chloride
Replace the carbon electrodes with copper electrodes
Which anion present in zinc sulphate solution?
SO42-
Zn2+, H+
OH- , SO42-
Zn2+, SO42 , H+, OH-
Electrochemistry is
Study of electron in atom
Study of electricity in molecules
The relationship between chemical reactions and electricity
the study of electrons moving from one a tom to another
Which of the following substances can be used as an electrolyte in electrolysis?
Ethanol
Ester
Distilled water
Sodium Chloride solution
Which of the following shows the application of chemical cell?
Electroplating of iron spoon
Generating electrical energy from seawater
Purification of metal
Wastewater treatment using electro-coagulation
