Dissolving sugar in water is a physical change as it does not alter the chemical composition of sugar.

Dissolving ammonium nitrate in water absorbs heat, making it an endothermic reaction.

All the given relationships are correct and represent the conversion between moles, mass, and molar mass.

The correct relationship is mass = moles × molar mass.

The enthalpy change for a reaction at constant pressure is represented by ΔH.

Avogadro's number is 6.022 x 10^23, which represents the number of particles in one mole.

4 - x < 1 => -x < -3 => x > 3

4 - x < 2 => -x < -2 => x > 2.

6x - 4 ≤ 2x + 8 => 4x ≤ 12 => x ≤ 3.

7x - 4 < 10 => 7x < 14 => x < 2.

x/3 + 2 < 5 => x/3 < 3 => x < 9.

x/3 - 2 < 1 => x/3 < 3 => x < 9.

Lithium has the highest melting point among the alkali metals due to its small size and strong metallic bonding.

Mercury is a liquid at room temperature, but it is not an s-block element; however, among the options, it is the only liquid.

Sodium, calcium, and potassium are all essential s-block elements for human health, playing vital roles in various physiological processes.

Magnesium forms a protective oxide layer that prevents further oxidation.

Lithium is widely used in batteries, especially in rechargeable lithium-ion batteries.

Lithium is the least reactive among the alkali metals.

Rubidium is the most reactive among the s-block elements listed.

Lithium is the least reactive among the alkali metals.

Lithium is used in fireworks to produce a bright red color.

Lithium (Li) is used in fireworks to produce a bright red color.

Sodium is commonly used in fireworks for its bright yellow color.

Na2CO3 is a salt of a weak acid (H2CO3) and a strong base (NaOH), thus it will produce a basic solution.

The power set of F = {1, 2} is {{}, {1}, {2}, {1, 2}}.

The power set of F = {a, b} is {∅, {a}, {b}, {a, b}}.

A universal set contains all elements under consideration. Here, {1, 2, 3} contains all elements from both A and B.

The power set of a set with n elements has 2^n subsets. For G, n=2, so the power set is {∅, {x}, {y}, {x, y}}.

A subset can only contain elements from the original set. {5} is not a subset of {1, 2, 3, 4}.

The set {0} is not a subset of the natural numbers, as natural numbers start from 1.