Chapter 5 Vocab

Chemical Change: A change that produces one or more new substances with new chemical properties For example: Burning paper (combustion in general ) digestion of food, rusting, fireworks exploding, cooking an egg, any chemical reaction

Physical Change: A change in which the appearance (physical properties) of a substance changes but its chemical properties stay the same. Examples: Crushing a can, Melting an ice cube, Boiling water, Mixing sand and water, Breaking a glass, Dissolving sugar and water, Shredding paper, Chopping wood

Energy Level: One of the spaces around the nucleus of an atom in which an electron

Ion: An atom that has either a positive or negative change

Chemical Bond: The attractive force that holds atoms together

Subscript: A number in a formula that tells the number of atoms of an element in a compound

Radicals: A group of two or more atoms that acts like one atom Lye is a an example the formula is NaOH. The OH is the radical Compounds containing more then one radical are written with the radical in parentheses. Ba(OH)2

Chapter 6 How Matter Changes

A chemical change in which elements are combined or rearranged Chemical Reaction A chemical change in which elements are combined or rearranged

Mixture A combination of substances in which no reaction takes place

Dissolve To break apart

Solute The substance that is dissolved in a solution

A mixture in which one substance is dissolved in another Solution A mixture in which one substance is dissolved in another

Solvent A substance capable of dissolving one or more other substances

Chemical Equation A statement that uses symbols, formulas, and numbers to stand for a chemical reaction.

A substance that is altered in a chemical reaction. Reactant A substance that is altered in a chemical reaction.

A substance that is formed in a chemical reactions Product A substance that is formed in a chemical reactions

Law of Conservation of Matter Matter cannot be created or destroyed in chemical and common physical change

Balance To keep the number of atoms the same on both sides of the equation.

Coefficient A number placed before a formula in a chemical equation

A reaction in which elements combine to form a compound Synthesis Reaction A reaction in which elements combine to form a compound

Decomposition Reaction A reaction in which a compound break down into two or more simple substance

Single Replacement Reaction A reaction in which one element replaces another compound

Double Replacement Reaction A reaction in which the elements in two compounds are exchanged

Precipitate A solid that is formed and usually sinks to the bottom of a solution