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Chem - test 1
| Question | Answer |
|---|---|
| Two Broad Catagories of Matter | Pure Substances and Mixtures |
| Pure Substances are: | a single element or a single compound |
| A mixture is: | -Two or more substances that are physically mixed, not chemically combined -Two or more substances in different proportions |
| Homogeneous Mixture | a solution = uniform distribution of the components (solvents and solutes) throughout the mixture. |
| Heterogeneous Mixture | non-uniform or variable distribution of components throughout the mixture. |
| extensive property | property that depends on the amount of matter (ie. mass) |
| intensive property | property that does not depend on the amount of matter (ie. density, temperature) |
| theory | unifying principle that explains a body of experimental observations |
| law | concise, verbal or mathematical statement of a reliable relationship between phenomena |
| Accuracy | how close a measurement is to the true value of the property being measured. |
| Precision | repeatability of the measurement |
| Dalton's atomic theory | - Matter is composed of atoms. - All atoms of a given element are identical to one another - Atoms of two or more different elements combine in simple ratios to form compounds. - A chemical reaction involves changes in the arrangements of atoms. |
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