Explanation

Kirchhoff's Voltage Rule (KVL) states that the sum of potential differences (voltages) in a closed loop is zero.

This is based on the conservation of energy, as energy gained equals energy lost in a loop.

Explanation

Attainment means حصول

Achievement means حصول

Explanation

• The brain, situated in the cranial cavity is an important internal organ.
• It is the control centre of our body.
• It controls the movements and all that we do.
• The brain is protected by the skull.

Explanation

Explanation

Aldol condensation can occur between two aldehydes, two ketones, or an aldehyde and a ketone if they have at least one α-hydrogen.

The reaction forms a β-hydroxy compound, which often dehydrates to an α,β-unsaturated product.

Explanation

Reactivity in organic compounds is largely determined by the presence of multiple bonds.

Ethyne has a triple bond, which is the most reactive bond due to the greater electron density and availability for participation in reactions.

Explanation

 Cyclohexane is an alicyclic compound. 

Alicyclic compounds are cyclic (meaning they form a ring) and saturated (meaning they only have single bonds between carbon atoms).

Cyclohexane fits this description as it is a six-membered ring with only single bonds connecting the carbon atoms. 

Explanation

Molarity is calculated by dividing the number of moles of solute by the volume of solution in liters. 

Therefore, the molarity of pure water is approximately 55.56 moles/L, or approximately 55.5 M. 

Explanation

Radon (Rn) is a radioactive noble gas that is formed naturally from the decay of uranium and thorium in the Earth’s crust.

It is colorless, odorless, and radioactive.

It is often found in soil and rock.

Explanation