EVERYDAY SCIENCE

Detailed explanation-1: -Answer: Air is composed of 78 percent nitrogen. Oxygen accounts for 21 percent, and the inert noble gas argon makes up 0.9 percent of the air.

Detailed explanation-2: -Calorimetry is the process of measuring the amount of heat released or absorbed during a chemical reaction.

Detailed explanation-3: -chemical kinetics, the branch of physical chemistry that is concerned with understanding the rates of chemical reactions.

Detailed explanation-4: -Chemistry is the study of matter, analysing its structure, properties and behaviour to see what happens when they change in chemical reactions. As such, it can be considered a branch of physical science, alongside astronomy, physics and earth sciences including geology.

Detailed explanation-5: -Geochemistry: Geochemistry examines the nature and properties of geological materials and processes. Nuclear Chemistry: While most forms of chemistry mainly deal with interactions between electrons in atoms and molecules, nuclear chemistry explores the reactions between protons, neutrons, and subatomic particles.