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 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.

Plastic is transparent, allowing for better observation.

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.

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

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

Both the anode and cathode are made of iron.

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 protect them from decomposition caused by light.

To prevent them from evaporating quickly.

To prevent chemical reactions with the glass container.

None

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

Hydrogen

Chlorine

Oxygen

Sodium

None

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

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.

The surroundings would feel colder as the reaction proceeds.

None

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

The glass undergoes a permanent chemical change

A heat-sensitive dye embedded in the glass changes color

Silver halide crystals decompose into dark silver particles.

The glass absorbs light and then releases it as heat.

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 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.

They combine with the atoms of the cathode material.

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

C+2S→CS 2 ΔH=+320 kJ mol−1

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

None

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

Magnesium atoms lose electrons to become magnesium ions.

Copper ions from the solution deposit onto the magnesium strip.

Electrons from the copper strip react with the magnesium.

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

None

10.

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

Photolysis

Hydrolysis

Photosynthesis

Electrolysis

None

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