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Ch 1 Chemisty part 2
Vocab Words
Question | Answer |
---|---|
chemical bond | The force that holds two atoms together. |
molecule | A particle made of two or more atoms bonded together. |
compound | A pure substance made of two or more elements chemically combined. |
chemical formula | A formula that gives the elements in a compound and the ratio of atoms. |
mixture | Two or more substances that are mixed together but not chemically combined. |
heterogeneous mixture | A mixture in which pure substances are unevenly distributed throughout the mixture. |
homogeneous mixture | A mixture in which substances are evenly distributed throughout the mixture. |
solution | An example of a homogeneous mixture; forms when substances dissolve. |
weight | A measure of the force of gravity on an object. |
mass | A measure of how much matter is in an object. |
International System of Units | The system of units (SI) used by scientists to measure the properties of matter. |
volume | The amount of space that matter occupies. |
density | The measurement of how much mass of a substance is contained in a given volume. |
physical change | A change in a substance that does not change its identity. |
chemical change | A change in which one or more substances combine or break apart to form new substances. |