Term
| what are the two changes that matter can undergo? |
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Definition
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Term
| what do physical changes affect in a substance? |
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Definition
| size, shape, or whether its is a solid, liquid or gas |
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Term
| what do chemical changes produce? |
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Definition
| new substances that have properties different from those of the original substance |
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Term
| what is a process that produces chemical changes? |
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Definition
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Term
| what is the substance that exists before the reaction begins? |
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Definition
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Term
| what is the substances that form as a result of the reaction? |
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Definition
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Term
| what tell chemists at a glance the reactants, products, physical state, and proportions of each substance present? |
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Definition
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Term
| listed on the left side of an arrow, separated from each other by plus signs |
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Definition
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Term
| listed on the right side of the arrow, separated by plus signs |
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Definition
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Term
| what tells how many atoms of each element are in a compound? |
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Definition
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Term
| states that the number and kind of atoms must be equal for products and reactants |
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Definition
| the law of conservation of mass |
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Term
| what must you observe when you write the chemical equation for a reaction? |
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Definition
| the law of conservation of mass |
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Term
| who first stated the law and through experimentation realized when chemical reactions occured mothing is ever lost or created, however atoms do change partners? |
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Definition
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Term
| what can never be placed in the middle of a compound |
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Definition
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Term
| what do chemical reactions absorb and release? |
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Definition
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Term
| how are some ways energy is released |
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Definition
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Definition
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Term
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Definition
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Term
| in reactions that________ energy, the reactants are more________ , and their bonds have _____ energy than tose of the products |
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Definition
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Term
| minimum amount of energy need to start a chemical reaction |
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Definition
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Term
| tells how fast a reaction occurs after it has started |
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Definition
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Term
| what affects the rate of chemical reactions? |
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Definition
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Term
| most chemical reactions speed up with______ _______. |
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Definition
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Term
| what affects the rate of a chemical reaction? |
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Definition
| concentration of a substance; surface area |
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Term
| what is the amount of substance present in a certain volume? |
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Definition
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Term
| a substance that slows down a chemical reaction |
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Definition
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Term
| what can stop a chemical reaction |
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Definition
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Term
| a substance that speeds up chemical reactions |
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Definition
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Term
| large protein molecules that speed up reactants need for cell to work properly |
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Definition
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