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 transparent, allowing for better observation.

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

None

Which energy transformation occurs in an electrolytic cell?

Chemical energy to electrical energy

Electrical energy to chemical energy

Heat energy to electrical energy

Light energy to chemical energy

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 electrolyte is a solution of iron(II) sulfate.

Both the anode and cathode are made of iron.

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

None

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

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

It acts as the anode, which dissolves during electrolysis

None

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

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

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

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

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

None

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

Sodium

Oxygen

Hydrogen

Chlorine

None

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

To prevent them from evaporating quickly.

To keep the chemicals at a constant cool temperature.

To prevent chemical reactions with the glass container.

To protect them from decomposition caused by light.

None

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

Photosynthesis

Photolysis

Hydrolysis

Electrolysis

None

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

The glass absorbs light and then releases it as heat.

Silver halide crystals decompose into dark silver particles.

The glass undergoes a permanent chemical change

A heat-sensitive dye embedded in the glass changes color

None

10.

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.

Electrons from the copper strip react with the magnesium.

Copper ions from the solution deposit onto the magnesium strip.

Magnesium atoms lose electrons to become magnesium ions.

None

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