Term | Meaning |
acid | a substance with a sour taste and low pH that conducts electricity when dissolved in water and that neutralizes bases |
atom | a tiny particle of matter consisting of protons, nuetrons, and electrons |
atomic number | the number of protons on the nucleus of an element |
base | a substance with a high pH that conducts electricity when disolved in water and that neutralizes acids |
chemical reaction | a process in which one substance or set of substances is changed into another substance or set of substances |
compound | a substence made of two or more elements chemically combined in exact proportion |
covalent bond | the combining of two or more atoms by the sharing of electrons |
electron | a negatively charged particle orbiting the nucleus of an atom |
element | a substance that cannot be broken down into a simpler substance by chemical means |
ion | an atom or molocule with an electric charge |
Inoic bond | The combing of two or more atoms by the transfering electrons |
mixture | a substance made up of two or more different substances that are not chemically combined; for example, salt water |
molecule | a group of two or more atoms held together by the sharing of electrons |
neutron | a neutral particle in the nucleus of an atom |
periodic table | chart in which the elements are arranged according to atomic weight and the number of electrons in their outer shells |
polymer | a compound that has very large molecules made up of thousands of smaller, identical molecules joined together |
proton | a positively charged particle in the nucleus of an atom |
states of matter | the different forms substances can take: solid, liquid, or gas |