Explanation

• Ionic crystals are typically characterized by high melting points due to the strong electrostatic forces between the positively and negatively charged ions.
• The attractive forces between oppositely charged ions are strong, requiring a significant amount of energy to overcome, resulting in high melting points.

Explanation

• When the pressure on a gas increases, the molecules are forced closer together, resulting in a higher density.
• This is because the volume of the gas decreases as the pressure increases, causing the molecules to be more concentrated.

Explanation

• Magnesium (Mg) is an alkaline earth metal that loses two electrons from its outer shell to form a divalent cation (Mg²⁺).
• This means that it typically loses two electrons to form compounds, resulting in a valency of +2.

Explanation

• Atomic radius decreases along a period as you move from left to right.
• This is because the number of protons in the nucleus increases, which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.

Explanation

• In a suspension, the particle size is typically larger than 10 nm (nanometers) in diameter.
• Suspensions are heterogeneous mixtures where the particles of the solute (solid, liquid, or gas) are dispersed in a solvent (liquid, gas, or solid) and are visible to the naked eye or under a microscope.

Explanation

• An example of a true solution is Ink in water.
• In a true solution, the solute particles are completely dissolved and cannot be seen or separated by filtration, which is characteristic of ink dissolved in water.

Explanation

• The initial temperature of a liquid does not affect its boiling point.
• The boiling point is the temperature at which a liquid changes state to a gas at a given pressure.
• It is a physical property of the substance itself.

Explanation

• A covalent bond is a chemical bond formed by the mutual sharing of electrons between two atoms.
• This type of bond typically occurs between nonmetal atoms, such as in molecules and organic compounds.

Explanation

• Lone pairs are electron pairs that are not shared by atoms in a covalent bond.
• They are pairs of electrons that are localized on a single atom and are not involved in bonding.
• Lone pairs are also known as non-bonding pairs or free pairs.

Explanation

• A molecular formula is a chemical formula that shows the actual number and type of atoms in a molecule.
• It is a way to represent the composition of a molecule using symbols and numbers.

For example:

• Water: H2O (two hydrogen atoms and one oxygen atom)