Chem - test 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Two Broad Catagories of Matter | Pure Substances and Mixtures
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| Pure Substances are: | a single element or a single compound
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| A mixture is: | -Two or more substances that are physically
mixed, not chemically combined
-Two or more substances in different proportions
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| Homogeneous Mixture | a solution = uniform
distribution of the components (solvents and solutes) throughout the mixture.
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| Heterogeneous Mixture | non-uniform or
variable distribution of components throughout
the mixture.
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| extensive property | property that depends on the amount of matter (ie. mass)
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| intensive property | property that does not depend on the amount of matter (ie. density, temperature)
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| theory | unifying principle that explains a body of experimental observations
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| law | concise, verbal or mathematical statement of a reliable relationship between phenomena
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| Accuracy | how close a measurement is to the true value of the property being
measured.
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| Precision | repeatability of the
measurement
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| 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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