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29 maj 2023 · Air. 1. The Fluid which we Breathe, and which surrounds the earth; the Atmosphere. It is Invisible, inodourous, Insipid, transparent, compressible, Elastic, and ponderable.
29 lis 2019 · Air is the general name for the mixture of gases that makes up the Earth's atmosphere. This gas is primarily nitrogen (78%), mixed with oxygen (21%), water vapor (variable), argon (0.9%), carbon dioxide (0.04%), and trace gases. Pure air has no discernible scent and no color.
Atoms are the building blocks of molecules found in the universe—air, soil, water, rocks—and also the cells of all living organisms. In this model of an organic molecule, the atoms of carbon (black), hydrogen (white), nitrogen (blue), oxygen (red), and sulfur (yellow) are shown in proportional atomic size.
The process of reorganizing atoms by breaking one set of chemical bonds and forming a new set is known as a chemical reaction. Chemical reactions occur when chemical bonds between atoms are formed or broken.
The Gibbs free energy ( G) of a system is a measure of the amount of usable energy (energy that can do work) in that system. The change in Gibbs free energy during a reaction provides useful information about the reaction's energetics and spontaneity (whether it can happen without added energy).
21 mar 2024 · Chemistry is chemistry, whether in a cell or outside it, but biological chemistry is a particular subset of organic chemistry that often involves enormous macromolecules, and that happens in the aqueous environment of the cell.
Matter and elements. The term matter refers to anything that occupies space and has mass—in other words, the “stuff” that the universe is made of. All matter is made up of substances called elements, which have specific chemical and physical properties and cannot be broken down into other substances through ordinary chemical reactions.
