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

A heat-sensitive dye embedded in the glass changes color

The glass absorbs light and then releases it as heat.

The glass undergoes a permanent chemical change

Silver halide crystals decompose into dark silver particles.

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 products have a higher energy content than the reactants.

The reaction is endothermic, absorbing heat from the surroundings.

The reaction is exothermic, releasing heat into the surroundings.

None

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

Photosynthesis

Electrolysis

Hydrolysis

Photolysis

None

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

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

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

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

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

None

Which energy transformation occurs in an electrolytic cell?

Chemical energy to electrical energy

Light energy to chemical energy

Electrical 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?

Chlorine

Sodium

Oxygen

Hydrogen

None

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

To keep the chemicals at a constant cool temperature.

To prevent them from evaporating quickly.

To protect them from decomposition caused by light.

To prevent chemical reactions with the glass container.

None

Which of the following reaction equations represents an endothermic process?

Zn+2HCl→ZnCl2 +H2 ΔH = −152 kJ mol−1

2Mg + O2 →2MgO ΔH = −1204 kJ mol−1

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

C+2S→CS 2 ΔH=+320 kJ mol−1

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 is used to stir the electrolyte solution.

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

It functions as the electrolyte for the cell

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10.

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

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

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

Both the anode and cathode are made of iron.

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

None

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