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Chemistry Part 2
Vocabulary
| Term | Definition |
|---|---|
| Activation Energy | What is needed to start a chemical reaction |
| Arrow | you read arrows as "yields" in a chemical equation or formula |
| Characteristics of a Chemical Reaction | changes in energy or changes in properties (produce a gas (bubbles form), color change, precipitate forms or temperature change) |
| Chemical Changes | alter the chemical properties of matter; new substances with new properties are formed |
| Chemical Equations | a shorter, easier way to show chemical reactions by using symbols instead of words |
| Coefficient | a number placed in front of a chemical formula in an equation. Tells how many atoms or molecules of each reactant and product take part in the reaction |
| Conservation of Mass | the amount of matter involved in a chemical reaction does not change. The total mass of the mass of the reactants must equal the total mass of the products |
| Controlling Rates of Reaction | Concentration, Temperature, Surface, Area, Catalysts, Enzymes,Inhibitors |
| Decomposition Reaction | a compound breaks down into simpler substances |
| Endothermic Reaction | an observable change in energy that shows a chemical reaction took place; A reaction that takes heat from the solution, absorbs energy, makes it feel cooler |
| Exothermic Reaction | an observable changes in energy that shows a chemical reaction took place; A reaction that releases heat; gives off energy, makes it feel warmer; most chemical reactions are this type |
| Physical Change | alter only the physical properties of matter; no new substances are formed. Can be changed in size, shape or color; change in phase (by increasing or decreasing temperature: solid, liquid, gas) |
| Precipitate | a solid that forms from solution during a chemical reaction; observable change that shows a chemical reaction took place |
| Products | the materials you have after a chemical reaction; written on the right side of the formula |
| Reactants | the materials you have at the beginning of a chemical reactions; written on the left side of the formula |
| Replacement Reaction | one part of a compound is displaced by an element or compound from another substance ( also called displacement reaction) |
| States of Matter | solid, liquid, and gas |
| Subscripts | show the number of atoms of an elements in a molecule or the ratio of elements in a compound |
| Synthesis reaction | two substances combine to form a new compound (also composition reaction) |
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