Explanation

Polythene is a thermoplastic because it softens when heated and can be reshaped.

It is formed by polymerization of ethene molecules.

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

Neon is used in decorative lights.

Concept:

The color of the light depends on the gas in the tube.

Neon lights were named for neon, a noble gas that gives off a popular orange light

Explanation

In the Fahrenheit scale:

• The freezing point of water is 32°F
• The boiling point of water is 212°F

Explanation

Evaporation happens when a liquid turns into a gas.

It can be easily visualized when rain puddles “disappear” on a hot day or when wet clothes dry in the sun.

In these examples, the liquid water is not actually vanishing—it is evaporating into a gas, called water vapor.

Explanation

Gold is the most malleable metal, which means it can be beaten into thin sheets or shapes without breaking.

Gold is a soft, ductile metal with a high degree of plasticity, making it easy to work with.

It can be hammered, rolled, or bent into various forms without cracking or shattering.

Explanation

• The mass number (A) is the sum of protons and neutrons present in the nucleus of an atom.
• It is a measure of the total number of nucleons (protons and neutrons) in the nucleus.

Explanation

Antimony sulphide, sulphur, potassium chlorate are the chemicals present in match stick.

The head of safety matches is made of an oxidizing agent.

Such as potassium chlorate, mixed with sulfur, fillers, and glass powder.

Explanation

Explanation

Fluorine is the most electronegative element on the periodic table.

Fluorine is the most electronegative element because it has 5 electrons in its 2p shell.

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