Question

The table shows the melting and boiling points of four pure substances.
Which substance is a liquid at room temperature and rapidly evaporates if left exposed to air?​

Answer 1

Answer:

substance A...

is correct

Answer 2

Answer:

Explanation:

Melting point definition:

The temperature at which a pure substance's solid and liquid states can coexist in equilibrium is known as the melting point. A solid's temperature will rise when heat is added to it until the melting point is reached. The solid will then turn into a liquid with further heating without changing temperature.

Boiling point definition:

Boiling point is the temperature at which a liquid's internal pressure equals the external pressure exerted by the liquid's vapour; in this situation, the addition of heat causes the liquid to turn into its vapour without rising the temperature.

Pure substance:

Pure substances have a stable or unchanging structure and are made up of just one type of particle.

Elements and compounds are subclasses of pure substances.

• A material that solely contains one type or class of atom is said to be an element. Since it cannot be altered through physical or chemical means to break down or create new substances, an element is a pure material. The majority of elements are metals, nonmetals, or metalloids.
• Contrarily, compounds are also pure substances when two or more elements are chemically united in a predetermined ratio. However, via chemical processes, these chemicals can be divided into different elements.

Examples of pure substance:

Most of the elements are made up of pure materials. Gold, copper, oxygen, chlorine, diamond, and so on are just a handful of them. Pure substances also include mixtures like water, salt crystals, baking soda, and others.

Melting point and Boiling point of pure substance:

When a substance is pure, it has a sharp melting point (melts at a certain temperature) and boiling point (boils at one temperature). A mixture can melt at different temperatures and can boil at different temperatures. Solutions are homogeneous mixtures.

Substance A is a liquid at room temperature and rapidly evaporates if left exposed to air.

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