Explanation

CaCO₃ → CaO + CO₂ is an endothermic reaction because it absorbs heat to decompose calcium carbonate.

Exothermic reactions (like combustion reactions) release heat to the surroundings.

Explanation

Number of neutrons = Atomic mass - Atomic number

= 27 - 13 = 14

Atomic number (13) gives the number of protons, and subtracting it from the atomic mass gives the neutrons.

Explanation

Nylon 6,6 is a type of synthetic polymer made through a condensation reaction between adipic acid and hexamethylenediamine.

These two chemicals react to form a long-chain polymer with repeating units, creating the strong and durable material known as Nylon 6,6.

Explanation

F-block elements are also known as inner transition elements.

They include the lanthanides and actinides and are located at the bottom of the periodic table, separated into two rows.

This placement is due to their electron configuration, where the "n-2" f orbitals are being filled.

Explanation

The biosphere includes all of these: the Atmosphere, the Hydrosphere, and the Lithosphere.

The biosphere is the zone on Earth where life exists, encompassing the living organisms and their interactions with the surrounding environment, including the atmosphere, hydrosphere (water bodies), and lithosphere (land).

Explanation

Vacuum distillation is used to distill substances at lower temperatures by reducing the pressure, which lowers the boiling point of the substances.

Explanation

Hydrochloric acid (HCl) contains one ionizable hydrogen atom, which dissociates in water to form H⁺ and Cl⁻ ions.

It is classified as a monoprotic acid, meaning it donates only one proton (H⁺) per molecule.

Explanation

Explanation

Explanation

The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions.

When light passes through a colloidal solution, the dispersed particles scatter the light in different directions, making the path of the light visible.