Explanation

Approximately 70% of the Earth's surface is covered with water.

This includes oceans, seas, lakes, rivers, and other bodies of water.

Explanation

CH3-CH2- is the ethyl radical.

The ethyl radical is a functional group derived from ethane (C2H6) by removing a hydrogen atom.

It leaving a highly reactive species with an unpaired electron.

Explanation

Chlorine (Cl) is a strong oxidizing agent.

It means it can accept electrons from other substances and cause them to be oxidized.

Explanation

• When a saturated solution is diluted, the concentration of the solute decreases, and the solution becomes unsaturated.
• This means that the solution can still dissolve more solute than it currently contains.

Explanation

• An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal, in a solid state.
• The components of an alloy are typically mixed when they are molten, and then solidified to form a uniform solid solution.

Explanation

• The freezing point of a liquid can be affected by pressure.
• This is known as the "pressure melting point" effect.
• As pressure increases, the freezing point of a liquid can also increase.

Explanation

• Henry Moseley's famous work in 1913 showed that the chemical properties of elements are a periodic function of their atomic number (Z), not their atomic mass.
• This discovery led to the modern periodic table, where elements are arranged in order of increasing atomic number (Z), rather than atomic mass.

Explanation

Explanation

When ethanol is in excess and the temperature is around 140°C, concentrated H₂SO₄ acts as a dehydrating agent and promotes the formation of diethyl ether:

2CH₃CH₂OH → CH₃CH₂–O–CH₂CH₃ + H₂O

So, the major product is ether (specifically diethyl ether) under these conditions.

Explanation

A gas being cooled is a system where entropy is decreasing. 

When a gas is cooled, its molecules slow down and become more ordered, leading to a decrease in entropy.