Term
| Matter can undergo two kinds of changes. Name them. |
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Definition
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Term
| What is a physical change? |
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Definition
| change in a substance that affects only properties like size and shape |
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Term
| What is a chemical change? |
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Definition
| change that produces new substances that have properties different from those of the original substances |
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Term
| What is a process that produces chemical changes? |
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Definition
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Term
| What are the substances that react called? |
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Definition
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Term
| Reactants are the substances that exist before what? |
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Definition
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Term
| What are the substances that form as a result of the reaction? |
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Definition
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Term
| What tells chemists at a glance the reactants, products, physical state, and the proportions of each substance present? |
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Definition
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Definition
| They tell you the number of atoms of each element in that compound |
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Term
| According to what law does the mass of the product must be the same as the mass of the reactants in that chemical reaction? |
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Definition
| law of conservation of mass |
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Term
| What kind of reactions absorb heat energy? |
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Definition
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Term
| What kind of reactions release heat energy? |
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Definition
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