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Definition
| anything that has mass and takes up space |
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| the study of matter and how matter changes |
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| Matter can be described in terms of two kinds of properties |
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Definition
| physical and chemical properties |
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| Changes in matter can be described in terms of |
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Definition
| physical changes and chemical changes |
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| a characteristic of a substance that can be observed without changing the substance into another substance |
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| a characteristic of a substance that describes its ability to change into other substances |
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Definition
| any change that alters the form or appearance of a substance but does not make the material into another substance |
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| the process in which substances undergo chemical changes that result in the formation of new substances |
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Definition
| when bonds break and new bonds form |
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| Chemical reactions involve two main kinds of changes that you can observe |
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Definition
| formation of new substances and changes in energy |
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Definition
| a solid that forms from a solution during a chemical reaction |
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Definition
| a reaction in which energy is absorbed |
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| a reaction that releases energy in the form of heat |
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Definition
| a short, easy way to show a chemical reaction, using symbols instead of words |
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| Chemical equations use... |
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Definition
| chemical formulas and other symbols instead of words to summarize a reaction |
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Definition
| the substance you have at the beginning. On the left side of equation |
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Definition
| new substance, the right side of the chemical equation |
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Term
principle of conservation of mass
states tat in a chemical reaction, |
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Definition
| the total mass of the reactants must equal the total mass of the products |
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Definition
| matter can enter from or escape to the surroundings |
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Definition
| matter is not allowed to enter or leave |
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| To describe a reaction accurately, |
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Definition
| a chemical equation must show the same # of each type of atom on both sides of the equations |
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Definition
| a number placed in front of a chemical formula in an equation |
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| Many chemical reactions can be classified in one of three categories: |
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Definition
| synthesis, decomposition, or replacement |
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Definition
| a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
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Definition
| a chemical reaction that breaks down compounds into simpler products |
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Definition
| a reaction in which one element replaces another in a compound or when two elements in different compounds trade places |
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Definition
| the minimum amount of energy needed to get a chemical reaction started |
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Definition
| the amount of one material in a certain volume of another material |
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Definition
| a material that increases the rate of a reaction by lowering the activation energy |
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Definition
| a biological catalyst that lowers that activation energy of reactions in cells |
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Definition
| a material that decreases the rate of a reaction |
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Definition
| a rapid reaction between oxygen and fuel that results in fire |
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Definition
| a material that releases energy when it burns |
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