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chemical reaction
Term | Definition |
---|---|
Activation Energy | What is needed to start a chemical reaction. |
Arrow -----> | you read the arrow as "yields" in a chemical reaction |
Characteristics of a Chemical Reaction | changes 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 of molecules of each reactant and product take part in the reaction. |
Conservation of Mass | the amount of matte involved in a chemical reaction does not change. The total mass of the reactants must equal the total mass of the products. |
Decomposition Reaction | a compound breads 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 | n observable change in energy that shows a chemical reaction took place; a reaction that releases heat; gives of energy, makes it feel warmer; most chemical reactions are this type. |
Physical Changes | alter only the physical properties of matter; no new substances are formed. Can be a change 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. |