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Chemisrty
| Question | Answer |
|---|---|
| What is needed to start a Chemical Reaction? | Activation Energy |
| What is an Arrow? | -->s are "yeilds" in an chemical formula or equation |
| What are some Charistics of an Chemical Reaction? | changes in energy or changes in properties produce: Gas (bubbles form), color change, precipitate forms, and temperature changes. |
| Alter the chemical properties of matter; new substances with new properties are formed | Chemical Changes |
| What is a shorter, easier way to show chemical reactions by using symbols instead of words? | Chemical Equations |
| 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. | Coeffient |
| What is the amount of matter involved in a chemical reaction that does not change. The total mass of the reactants must equal the total mass for the products. | Conservation Mass |
| What are the controlling rates of Reaction? | Concentration, temperature, surface area, catalysts, enzymes and inhibitors. |
| What is the amount of one material in a given amount of another material? | Concentration |
| Temperature | higher heat causes faster reactions |
| Surface area | increased surface area= increased reaction |
| Catalysts | materials that increases the rate of reaction |
| Enzymes | biological catalysts |
| Inhibitors | decreases the rate of a reaction |
| 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 |
| 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 size, shape or color; change in phase( by increasing or decreasing temperature: solid, liquid or 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 formula |
| Replacement Reaction | one art of a compund is displayed 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 element in a molecule or the ratio of elements in a compound |
| Synthesis Reaction | two substances combine to form a new compound ( also called composition reaction) |
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