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Barnett6 - Matter
Barnett - 6th grade matter vocabulary
Question | Answer |
---|---|
matter | anything that has mass and takes up space |
energy | ability to do work or cause a change |
chemistry | study of the properties of matter and how matter changes |
substance | single kind of matter that has distinct physical and chemical properties |
compound | substance made of two or more elements chemically combined in a set ratio or proportion |
element | substance that cannot be broken down into any other substance by physical or chemical means |
mixture | made of two or more substances (can be elements, compounds, or both) that are in the same place but are NOT chemically combined |
atom | smallest unit of an element that keeps the properties of that element |
nucleus | the tiny, central core of an atom, contains protons and neutrons |
proton | small, positively (+) charged particle in the nucleus of an atom |
neutron | small, uncharged particle in the nucleus |
electron | tiny, negatively charged (-), high-energy particle that moves in the space around the nucleus |
chemical bond | the force that holds two atoms together |
molecule | two or more atoms that are bonded together |
chemical formula | a shorthand way to represent a compound. Elements are indicated using symbols from the periodic table and the number is indicated with subscripts |
chemical equation | a shorter, easier way to show chemical reactions, using symbols instead of words |
subscripts | numbers in the formula that are written smaller and lower than the letters. They show the ratio of the atoms in a molecule |
reactants | the materials at the beginning of a reaction. Written first in a chemical equation (what you start with) |
products | the materials that are at the end of the reaction. Written after the arrow in a chemical equation. (what you end up with) |
conservation of mass | matter cannot be created or destroyed |