HESI A2 Chemistry Latest Update 2024

HESI A2 Chemistry Acid a compound that is a hydrogen or proton donor. It is corrosive to metals, changes blue litmus paper red, and becomes less acidic when mixed with bases Atom the basic building block of a molecule that contains a nucleus and orbits Atomic mass the average mass of each of that element's isotopes Base a hydrogen or proton acceptor and generally has a hydroxide (OH) group in the makeup of the molecule. Bases are also called alkaline compounds and are substances that denature proteins, making them feel very slick; they change red litmus paper blue and become less basic when mixed with acids. basic unit of measure standard unit of a system by which a quantity is accounted for and expressed (grams, liters, or meters) catalysts substances that accelerate a reaction by reducing the activation energy or the amount of energy necessary for a reaction to occur Celsius a temperature system used in most of the world and by the scientific community; It has these characteristics: zero degrees = freezing point of pure water at sea level 100 degrees = boiling point of pure water at sea level. Most people have a body temperature of 37 degrees Celsius. Chemical equations combination of elements or compounds called reactants responding to create a product or end result. Equations are written in the following manner: reactants --- products. The arrow can go the other way or both ways