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

Which energy transformation occurs in an electrolytic cell?

Heat energy to electrical energy

Chemical energy to electrical energy

Electrical energy to chemical energy

Light energy to chemical energy

None

What happens to the electrons at the positive terminal (cathode) of a simple chemical cell, such as one made of zinc and copper?

They combine with the atoms of the cathode material.

They flow from the cathode to the anode through the external wire.

They are released by the copper electrode into the solution.

They are accepted by positive ions from the electrolyte.

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

Plastic is less reactive than glass with the chemical solutions.

Plastic is transparent, allowing for better observation.

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

None

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

Photosynthesis

Photolysis

Electrolysis

Hydrolysis

None

Which of the following reaction equations represents an endothermic process?

C+2S→CS 2 ΔH=+320 kJ mol−1

2Mg + O2 →2MgO ΔH = −1204 kJ mol−1

Zn+2HCl→ZnCl2 +H2 ΔH = −152 kJ mol−1

C2H5OH + 3O2 →2CO2 + 3H2O ΔH = −1270 kJ mol−1

None

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 endothermic, absorbing heat from the surroundings.

The reaction is exothermic, releasing heat into the surroundings.

The products have a higher energy content than the reactants.

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.

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

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

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

None

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

Both the anode and cathode are made of iron.

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

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

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

None

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

To increase the purity of the final aluminium product.

To prevent the carbon anodes from oxidizing.

To significantly lower the melting point of aluminium oxide.

To act as a catalyst and speed up the reaction.

None

10.

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

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