Kuiz Sains Tambahan Tingkatan 5 Bab 4 Set 1

SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 4 Set 1

Tenaga Dan Perubahan Kimia (English)

KUIZ INI MENGANDUNGI 10 SOALAN

In an experiment to measure the heat of displacement, a plastic cup is used as the calorimeter. What is the main reason for this choice?

Plastic is transparent, allowing for better observation.

Plastic is less reactive than glass with the chemical solutions.

Plastic cups are cheaper and more readily available than glass beakers.

Plastic is a good insulator, minimizing heat loss to the surroundings.

None

In a simple chemical cell constructed with magnesium and copper electrodes in an electrolyte, why does the magnesium strip become thinner over time?

The magnesium strip physically flakes off due to the electric current.

Copper ions from the solution deposit onto the magnesium strip.

Electrons from the copper strip react with the magnesium.

Magnesium atoms lose electrons to become magnesium ions.

None

During the electrolysis of a dilute aqueous sodium chloride (NaCl) solution using inert electrodes, what gas is produced at the anode?

Sodium

Chlorine

Oxygen

Hydrogen

None

During the electrolysis of molten lead(II) bromide (PbBr2), which products are formed at the anode and cathode respectively?

Lead(II) ions at the anode and bromide ions at the cathode.

Lead metal at the anode and bromine gas at the cathode.

Bromine gas at the anode and lead metal at the cathode.

Hydrogen gas at the cathode and oxygen gas at the anode.

None

In a photochromic lens, what causes the glass to darken upon exposure to sunlight?

The glass undergoes a permanent chemical change

Silver halide crystals decompose into dark silver particles.

The glass absorbs light and then releases it as heat.

A heat-sensitive dye embedded in the glass changes color

None

When electroplating an iron spoon with copper, which of the following setups is correct?

The iron spoon is the anode, and a copper bar is the cathode.

Both the anode and cathode are made of iron.

The electrolyte is a solution of iron(II) sulfate.

The iron spoon is the cathode, and the electrolyte is copper(II) sulfate.

None

Why are photosensitive chemicals such as silver bromide and hydrogen peroxide typically stored in dark or opaque bottles?

To prevent chemical reactions with the glass container.

To protect them from decomposition caused by light.

To prevent them from evaporating quickly.

To keep the chemicals at a constant cool temperature.

None

What is the specific process that uses light energy to split water molecules into hydrogen ions and oxygen during photosynthesis?

Electrolysis

Photosynthesis

Photolysis

Hydrolysis

None

What is the primary function of adding cryolite (Na3AlF6) to aluminium oxide (Al2O3) during the industrial extraction of aluminium?

To significantly lower the melting point of aluminium oxide.

To increase the purity of the final aluminium product.

To act as a catalyst and speed up the reaction.

To prevent the carbon anodes from oxidizing.

None

10.

Which energy transformation occurs in an electrolytic cell?

Heat energy to electrical energy

Electrical energy to chemical energy

Light energy to chemical energy

Chemical energy to electrical energy

None

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