IndietroThe Chemical Basis of Life - General Biology
02:13
Termini in questo insieme (20)
Elements are substances that cannot be broken down into simpler substances by chemical means.
Atoms are the smallest units of an element that retain the properties of that element.
Compounds are substances formed when two or more different elements combine chemically.
Isotopes are atoms of the same element with different numbers of neutrons.
Ions are atoms or molecules that have gained or lost electrons, acquiring a charge.
A covalent bond is a chemical bond where atoms share one or more pairs of electrons.
An ionic bond is a chemical bond formed by the attraction between oppositely charged ions.
A hydrogen bond is a weak attraction between a hydrogen atom in one molecule and an electronegative atom in another.
Polarity refers to the uneven distribution of electrons in a molecule, resulting in partial positive and negative charges.
Water has cohesion, adhesion, high specific heat, solvent abilities, and expands when frozen.
Cohesion is the attraction between water molecules due to hydrogen bonding.
Adhesion is the attraction between water molecules and other substances.
Surface tension is the resistance of water's surface caused by cohesion of water molecules.
Water is a universal solvent because it dissolves many substances due to its polarity.
pH measures the acidity or alkalinity of a solution, based on hydrogen ion concentration.
An acid increases hydrogen ion concentration in a solution, lowering pH.
A base reduces hydrogen ion concentration, raising pH.
Acidification is the process of becoming more acidic, often due to environmental changes.
Water supports life by regulating temperature, dissolving substances, and enabling chemical reactions.
Scientists search for water because it is essential for life as we know it, indicating possible habitability.