Unit 5: Chemical Reactions Vocabulary

A unit of mass to express atomic + molecular weights

States that the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change

The sum of the atomic weights of the atoms in the empirical formula of the compound

The relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers

A substance that produces hydroxide ions (OH-) when dissolved in a water solution

Chemical reaction that occurs when the H3O+ ions from an acid react with the OH- ions from a base to produce water molecules and a salt

The number of atoms/molecules in one mole, equal to 6.023 x 10^23

Chemical reaction that requires thermal energy in order to proceed

In a chemical reaction, the new substance or substances formed

A substance that produces hydrogen ions in a water solution

H3O+ ion, forms when an acid dissolves in water and H+ ions interact with water

A measure of the concentration of the hydronium ions in a solution using a scale ranging from 0 to 14 being the most basic

Shorthand method used to describe chemical formulas and other symbols

Chemical reaction in which energy is primarily given off in the form of thermal energy

In a substance, the substance that reacts

A solution that has a high concentration of Hydrogen ions (H+) greater than the concentration of water

A solution that is neither acidic or basic, it has equal amounts of Hydrogen ions (H+) and Hydroxide (OH-)

Compound formed when negative ions from an acid combine with positive ions from a base