A combination of symbols and numbers that represent the number and types of elements (atoms) present in a compound
A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance. No subscript means there is only one atom present.
When substances interact to form one or more new substances with different properties than the original substances
A combination of symbols and chemical formulas used to describe what happens in a chemical reaction. The equation identifies the reactants and resulting products.
A number written in front of a chemical formula to show how many molecules of that substance are present.
Formulas written on the left side of the arrow symbol ( ) are the starting substances in a chemical reaction.
Formulas written on the right side of the arrow symbol ( ) are the new substances formed in a chemical reaction.
An arrow symbol that shows a reaction has taken place. The reactants have reacted to produce a new substance (the product).
A substance composed of two or more elements chemically combined and in a definite proportion
A change in which the characteristics of a substance are only changed physically and the chemical composition stays the same.
A change in which a substance (or substances) is changed into one or more new substances with different properties than the original substances
law of conservation of mass
Matter is not created or destroyed, only changed. The number of atoms in the reactants must be equal to the number of atoms in the product.
A solid that forms as a result of a chemical reaction. It may appear cloudy and will fall to the bottom of the container over time.