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21 Cards in this Set
- Front
- Back
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chemical change |
A change in matter in which the substances that make up the matter change into other substances with different chemical and physical properties |
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Chemical properties |
The ability or inability of a substance to combine with or change into one or more new substances |
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Substance |
Matter with composition that is always the same |
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Deposition |
The process of changing directly from a gas to a solid |
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Physical changes |
Change in the size, shape, form, or state of matter that does not change the matter's identity |
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Physical properties |
A characteristic of matter that you can observe or measure without changing the identity |
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Melting |
The change of a solid to a liquid when thermal energy is added |
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Dissolving |
Forming a solution by mixing evenly a solvent and a solute |
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Boiling |
The change of a liquid to a gas when thermal energy is added |
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Freezing |
The change of a liquid to a solid when thermal energy is taken away |
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Element |
Substance that consists of only one type of atom |
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Compound |
Substance containing atoms of two or more different elements |
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Homogeneous mixture |
A mixture in which two or more substances are evenly mixed but not bonded together |
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heterogeneous mixture |
A mixture in which substances are not evenly mixed |
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When a one kg log burns, its mass stays the same. why is that ? |
this is due to the law of conservation of mass which states that the mass before and after a chemical change is even |
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What happens when sugar dissolves into tea and how can it be separated ? |
The process is dissolving and can be separated and reversed by evaporation. |
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What's the difference between the nucleus of on oxygen and boron atom? |
The oxygen nucleus has 8 protons. The boron only has 5. |
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Two ways chemical reaction rate can be increased ? |
an increased surface area and or temperature |
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color change, odor change, and bubbles are a sign that what occurred ? |
a chemical change |
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Name a mixture that can be separated by magnetism. |
iron filings and sand |
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What are chemical equations used for ? |
describing the chemical formula of each substance in a reaction |
