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Chemistry pt.2
| Term | Definition |
|---|---|
| Activation Energy | what is needed to start a chemical reaction |
| Arrow | you read the arrow 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 a 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 reactants must equal the total mass of products |
| controlling rates of a reaction | concentration, temperature, surface area, catalysts, enzymes, and inhibitors |
| decomposition reaction | a compound breaks down into smaller 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 change in energy that shows a chemical reaction took place; gives off energy and makes it feel warmer, most chemical reactions are this type |
| physical changes | alter only the physical properties of matter; no new substances are formed, change in size, shape or color. |
| percipitate | a solid that forms from a solution during a chemical reaction; |
| products | the materials you have after a chemical reaction; writtin on the right side of the formula |
| reactants | the materials you have at the beginning of a chemical reaction; written on the left side of the formula |
| replacement reaction | one part of a compound id displaced by an element or a compound from another substance |
| subscripts | show the number of atoms in an element in a molecule or the ratio of element in a compound |
| synthesis reaction | two substances combine to form a new compound (also called a composition reaction) |
Created by:
Alexissanders
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