Atoms are the smallest particle of matter. Each has a nucleus of protons and neutrons surrounded by electrons.
An element is an atom with a particular atomic number, that is, a certain number of protons. Each element has a different number of protons.
A compound is something formed by two or more atoms.
is the tendency of a substance to stick (or adhere) to a different (an
unlike) substance. An example of adhesion is the tendency of a Band-aid
to stick to your skin.
Cohesion is the tendency of a substance to stick to itself. An example of cohesion is the tendency of water to bead on a waxy surface. The water molecules tend to stick to themselves as opposed to other substances.
An aqueous solution contains one or more chemicals (or solutes) dissolved in water (the solvent). The most common way to describe the concentration of a solute in an aqueous solution is to use a unit of measurement called molarity.
Acids donate protons while bases accept protons. Therefore an acid-base reaction involves the giving and receiving of protons for neutralisation. Acids have a pH of below 7, and bases have a pH of above 7 to 14.
a pH of 7, however, is considered neutral. that is, neither acidic nor basic.
A chemical reaction is a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.
enzyme is a biological term for a catalyst. Both speed up various
reactions. All enzymes are catalysts, whereas not all catalysts are
necessarily enzymes. Kinda like how all squares are quadrilaterals,
whereas not all quadrilaterals are squares.
Content will be erased after question is completed.