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13 Cards in this Set
- Front
- Back
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List the steps involved in the scientific method.
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1. observation and collection of quantitative or qualitative data
2. formulation of a hypothesis to explain the observation 3. prediction based on the hypothesis; and 4. testing the prediction |
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Theory
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-provides an explanation for a law
-theories cannot be proven |
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Phlogiston theory
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-materials that burned contained a substance called Phlogiston, and burning was thought to be the release of Phlogiston (The flame leaping from the fuel)
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What law did Lavoisier create?
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The Law of Conservation of Mass
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Law of Conservation of Mass
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during a chemical reaction, the total mass (reactants +products) remains constant; that is, mass is neither created nor destroyed during a chemical reaction.
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Element
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a pure substance that cannot be broken down by chemical means
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Compound
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a pure substance that consists of more than one element.
(magnesium oxide is a compound that is formed by the combination of two elements (magnesium and oxygen)). |
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Law of Definite Proportions
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the elements of a compound are present in definite (Fixed) proportions by mass.
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Law of Multiple Proportions
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when two different compounds are formed from the same two elements, the masses of one element that combine with a fixed mass of the other are in compounds that are composed only of the elements hydrogen and oxygen.
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Molecules
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the smallest units of a substance that have chemical properties of the substance
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What is the lightest of the known atoms?
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Hydrogen
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Law of Combining Volumes
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volumes of reacting gases are in simple whole number ratios.
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Avogadro's Law
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equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
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