Explanation

Silicon (Si) is the element most commonly used to fabricate solar cells and transistors.

Silicon is a semiconductor material that is widely used in the production of electronic components, including:

• Solar cells (photovoltaic cells)
• Transistors
• Microprocessors
• Diodes

Explanation

Dry ice is a solid form of carbon dioxide.

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"Dry ice" is solid, frozen carbon dioxide, which is sublimated at a chilly -78.5 °C (-109.3°F).

Dry ice is used primarily as a cooling agent.

Dry ice does not melt into a liquid when heated instead, it changes directly into a gas.

ND16-8-2023

Explanation

Diamond is an allotropic form of carbon.

Carbon is capable of forming many allotropes, which are structurally different forms of the same element, due to its valency.

Some of the well-known forms of carbon include:

• Diamond
• Graphite
• Graphene
• Lonsdaleite (hexagonal diamond)
• Graphenylene
• Carbophene
• AA'-graphite
• Diamane
• Amorphous carbon
• Nanocarbons
• Glassy carbon
• Carbon nanofoam
• Carbide-derived carbon
• Linear acetylenic carbon
• Cyclocarbons

Explanation

Limestone consists of calcium carbonate,

which has the chemical formula CaCO3.

Calcium carbonate is a chemical compound.

It is a common substance found in rocks as the minerals calcite.

Explanation

Aluminum is the most abundant metal in the Earth's crust.

It comprising about 8% of its weight.

It is primarily found in the form of bauxite ore.