Explanation

The first scientist who gave the concept of gravitation was Sir Isaac Newton.

He published his groundbreaking work, "Universal Law of Gravitation," in 1687.

It explained how gravity works and how it affects objects on Earth and in the universe.

Explanation

A tightrope walker carries a long pole to lower their center of gravity, making it easier to balance and maintain equilibrium.

By spreading their weight over a larger area (including the pole), they reduce the risk of toppling over.

Explanation

• A solution that contains a solid solute dissolved in a liquid solvent is called a solid-in-liquid solution or a solute-solvent solution.
• This is the most common type of solution, where a solid substance (the solute) is dissolved in a liquid substance (the solvent).

Explanation

• At room temperature, most ionic compounds are crystalline solids, meaning they have a rigid and orderly crystal structure.
• This is because the strong electrostatic forces between the oppositely charged ions hold them in a fixed position, creating a three-dimensional lattice.

Explanation

• Electronegativity is the ability of an atom to attract a shared pair of electrons in a covalent bond.
• It measures the ability of an atom to pull electrons towards itself.

Explanation

• Animals that migrate long distances need a compact and energy-dense source of fuel to sustain them during their journey.
• Fat is the most energy-dense nutrient, providing approximately 9 kcal/g, compared to carbohydrates (4 kcal/g) and protein (4 kcal/g).

Explanation

• Chemical reactions require specific conditions to proceed at a proper rate.
• Temperature and pressure are two of the most important factors that influence reaction rates.

Explanation

Eutrophication occurs when excess nutrients from fertilizers enter water bodies, stimulating excessive plant growth and depleting oxygen, harming aquatic life.

This can lead to the formation of "dead zones" where few organisms can survive, degrading the ecosystem.

Explanation

Fertilizers are substances containing chemical elements that provide essential nutrients for plant growth, including:

• Nitrates (N) for leaf growth and development
• Phosphates (P) for root development, flower and fruit formation
• Potassium (K) for overall plant health and resistance to disease

Explanation

Seafood is an excellent source of protein because it is typically low in fats (lipids) and high in protein.

Many types of seafood, such as fish and shellfish, are lean sources of protein, making them a popular choice for those looking to reduce their fat intake.