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

A chemical reaction has a change in enthalpy value of ΔH=−1204 kJ mol−1. Which statement accurately describes this reaction?

The surroundings would feel colder as the reaction proceeds.

The reaction is exothermic, releasing heat into the surroundings.

The products have a higher energy content than the reactants.

The reaction is endothermic, absorbing heat from the surroundings.

None

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 cups are cheaper and more readily available than glass beakers.

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

Plastic is transparent, allowing for better observation.

Plastic is less reactive than glass with the chemical solutions.

None

Which energy transformation occurs in an electrolytic cell?

Electrical energy to chemical energy

Chemical energy to electrical energy

Light energy to chemical energy

Heat energy to electrical energy

None

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

Sodium

Hydrogen

Chlorine

Oxygen

None

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

Hydrolysis

Photosynthesis

Electrolysis

Photolysis

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 prevent the carbon anodes from oxidizing.

To increase the purity of the final aluminium product.

To act as a catalyst and speed up the reaction.

None

In the industrial process of purifying copper, what is the role of the impure copper block?

It acts as the anode, which dissolves during electrolysis

It functions as the electrolyte for the cell

It serves as the cathode, where pure copper is deposited.

It is used to stir the electrolyte solution.

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.

Magnesium atoms lose electrons to become magnesium ions.

Electrons from the copper strip react with the magnesium.

Copper ions from the solution deposit onto the magnesium strip.

None

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

To protect them from decomposition caused by light.

To prevent them from evaporating quickly.

To prevent chemical reactions with the glass container.

To keep the chemicals at a constant cool temperature.

None

10.

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

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