Chemical Reactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Physical Change | A change that alters the form or appearance of a material but does not make the material into another substance.
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| Chemical Change | A change in which one or more substances combine or break apart to form new substances.
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| Reactant | A substance that enters into a chemical reaction.
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| Product | A substance formed as a result of a chemical reaction.
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| Precipitate | A solid that forms from a solution during a chemical reaction.
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| Exothermic Reaction | A reaction that releases energy, usually in the form of heat.
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| Endothermic Reaction | A reaction that absorbs energy.
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| Chemical Equation | A short, easy way to show a chemical reaction, using symbols.
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| Law of Conservation of Mass | The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
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| Open System | A system in which matter can enter from or escape to the surroundings.
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| Closed System | A system in which no matter is allowed to enter or leave.
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| Coefficient | A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
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| Synthesis | A chemical reaction in which two or more simple substances combine to form a new, more complex substance.
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| Decomposition | A chemical reaction that breaks down compounds into simpler products.
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| Replacement | A reaction in which one element replaces another in a compound or when two elements in different compounds trade places.
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| Activation Energy | The minimum amount of energy needed to start a chemical reaction.
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| Concentration | The amount of one material in a certain volume of another material.
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| Catalyst | A material that increases the rate of a reaction by lowering the activation energy.
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| Enzyme | A type of protein that speeds up a chemical reaction in a living thing; a biological catalyst that lowers the activation energy of reactions in cells.
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| Inhibitor | A material that decreases the rate of reaction.
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