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Flashcards 8
Mrs. Lopes
| Term | Definition |
|---|---|
| Chemical change/ Chemical reaction | A change that results in the formation of new substances. |
| Symbol | one or two letters that represents an element |
| Formula | 2 or more elements together |
| Catalyst | A substance that increases the rate of a chemical reaction without being permanently altered by the reaction. |
| Equation | another way to write a chemical reaction, has the → |
| Subscript | A number representing the number of atoms in an element in one molecule. For example, the subscript “2” in H₂0 - indicates there are 2 hydrogen atoms in a water molecule. |
| Coefficient | A number that multiplies a term in an equation For example, 6H₂0 means that there are 6 water molecules. |
| Yields | →, creates |
| Conservation of Matter | Matter cannot be created or destroyed |
| Reactants | Substances you start with in a reaction |
| Products | Substances you end with in a reaction |
| Decomposition | Substances broken down into two or more products, + sign on the right |
| Synthesis | Substance combine, there is a + on the left |
| Replacement | Elements trade places, + signs on both sides |
| Endothermic | A process that absorbs heat energy it gets colder around it Endo = Enter → heat enters (goes in) |
| Exothermic | A process that releases heat energy It gets warmer around it Exo = Exit → heat exits (leaves) |
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