Explanation

When NaCl (sodium chloride) is added to H₂O (water),

The solid salt dissolves and dissociates into its constituent ions, sodium (Na⁺) and chloride (Cl⁻),

Forming an aqueous solution called brine.

The equation for this process is: 

NaCl(s) + H₂O(l) → Na⁺(aq) + Cl⁻(aq) 

Explanation

An aqueous solution is one where the solute is dissolved in water.

"Aqua" means water, making it the key solvent in such solutions.

Explanation

Explanation

Diamond is a poor conductor of electricity

Because all of its carbon atoms are covalently bonded to four other carbon atoms,

Meaning there are no electrons available to move freely and conduct electricity. 

Explanation

A) Hydrogen - Very low solubility in water, decreases with increasing temperature.

B) Oxygen - Solubility decreases with increasing temperature; however, it is more soluble than hydrogen.

C) Air - A mixture of gases (mostly nitrogen and oxygen); individual gases like oxygen can dissolve, but overall solubility is affected by temperature.

Correct Answer: B) Oxygen

Oxygen is more soluble in water than hydrogen, and although its solubility decreases with increasing temperature, it remains the most soluble option among those listed.

Explanation

• When salt is added to pure water, the boiling point of the solution increases.
• This is known as boiling-point elevation.
• The boiling point of a solution is higher than that of the pure solvent (water)
• Because the dissolved salt particles disrupt the formation of vapor bubbles,
• Requiring more energy to overcome the surface tension and escape the solution as vapor.

Explanation

A bearing can be removed from a shaft by cooling or heating. 

This technique is based on thermal contraction, and it is used to remove bearings from shafts without causing damage. 

Method:

A coolant, such as liquid nitrogen or a dry ice mixture, is used to cool the shaft from the inside out.

Mechanism:

The shaft contracts more than the bearing as it cools, transforming the tight interference fit into a loose one, which allows for safe and easy removal.

Advantage:

This method prevents damage to the shaft and the bearing, so the components can be reused. 

Explanation

• As temperature increases, the heat energy of a substance also increases.
• This is because temperature is a measure of the average kinetic energy of the particles in a substance, and as temperature increases, the particles gain kinetic energy and therefore heat energy.

Explanation

• Reverse Osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
• This membrane has tiny pores that allow water molecules to pass through, but block larger particles and impurities.

Explanation