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Chemical Reactions
| Question | Answer |
|---|---|
| Activation Energy | What is needed to start a chemical reaction. |
| Arrow (-->) | You read the arrow as "yields" in a chemical equation and formula. |
| Characteristics of a chemical reaction | Changes in energy or change 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 formed. |
| Chemical Equasions | 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 reactants must equal the total mass of the products. |
| Controlling rates of reaction | (concentration, Temperature, Surface area, Catalysts, enzymes and 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 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; a reaction that releases heat;gives off 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 a 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 reaction; written on the left side of the fomula |
| replacement reaction | one part of a compound is displaced by an element or compound from another substance (also called displacement reaction) |
| States of matter (pp. 46-50) | Solis, Liquid, And gas |
| Subscipts | Show the number of atoms of an element in a molecule or the ratio in a compound |
| Synthesis Reaction | Two Substances combine to form a new compound (also called composition reaction) |
Created by:
zoeolivia368
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