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Chemvocab

Chemistry Vocabulary Words

QuestionAnswer
Chemistry the study of the properties of matter, and how matter changes.
Physical Property characteristic of a substance that can be observed without changing it into something else. Examples: density,meltingpoint, boiling point.
Density a measure of how heavy something is for its size. MASS /Volume
Chemical Property Characteristic observed when a substance changes into a different substance. Examples: burning, rusting
Element substance that can't be broken into other substances by either physical or chemical means. Represented by a 1 or 2 letter SYMBOL. Examples: hydrogen(H)
Compound two or more elements chemically combined in a set ratio.
Formula uses symbols and numbers to show the ratio of elements in a compound. Examples: H2O
Mixture two or more substances in the same place that are not chemically combined. Examples: milk, salt, and pepper
Chemical Reaction a change in matter that forms 1 or more new substances. Also called a CHEMICAL CHANGE. Example: the reaction of sodium and water.
Chemical Equation short, simple way to describe a chemical reaction using symbols and formulas instead of words. Example: C + 02
Reactants the substances you start with in a chemical reaction. To the left of the arrow.
Products the substances you end up with in a chemical reaction. To the right of the arrow.
Atom the smallest particle of an element
Molecule a particle made up of 2 or more atoms.
Chemical Bond the force that holds atoms together. During a chemical reaction, chemical bonds are either formed or broken apart.
Created by: pated