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| A concise statement that summarizes the results of many observations and experiments |
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| A mixture in which the composition is uniform throughout |
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| A mixture which composition is not uniform throughout |
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| A physical blend of two or more components |
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| A proposed explanation for an observation |
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| A substance present at the start of a reaction |
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| A substance produced in a reaction |
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| A substance that increases the rate of reaction by lowering the activation-energy barrier; the catalyst is not used up in the reaction |
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| Groups of 3 elements with similar properties |
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| Is a substance that contains two or more elements chemically combined in fixed proportion |
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| Is the ratio of the density of a given solid or liquid substance to the density of water at a specific temperature and pressure |
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| Is the ratio of the mass of an object to its volume |
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| Is the simplest form of matter that has a unique set of properties |
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| Matter that has a uniform and definite composition |
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| States that equal volumes of gases measured at the same temperature and pressure contain the same numbers of particles |
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| The law of definite proportion |
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| states that in samples of any chemical compound, the masses of the elements are always in the same proportions |
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| Responding or dependent variable |
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| The variable that is observed during the experiment |
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| Manipulated or independent variable |
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| The variable that you change in an experiment |
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| The zero point of the kelvin scale is 0k |
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| Well-tested explanation for a broad set of observations |
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Definition
| When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties |
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| The law of multiple proportions |
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| whenever the same two elements form more than |
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