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Chemvocab
Chemistry Vocabulary Words
Question | Answer |
---|---|
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. |