test
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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| Chemistry | is the study of the properties of matter how matter changes.
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| Element | Is a substance that cannot be broken into any other substances b chemical or physical means.
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| Compound | Is a substance made of two or more elements chemically combined in a specific ration, or proportion.
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| Mixture | Is made from two or more pure substances-elements, compounds, or both- that are in the same place but not combined as a new material.
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| Solution | is a well-mixed mixture.
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| Precipitate | A solid that forms from solution during a chemical reaction is called a
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| atom | The smallest particle of an element is an
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| Molecule | the combination of two or more atoms.
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| Chemical bonds | The force that holds atoms together is called
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| Chemical equation | is a shorter, easier way to show that chemical reactions, using symbols instead of words.
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| Symbol | Most elements are represented by a one-letter or two-letter
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| Chemical formula | A compound is represented by a "word", which shows the ratio of elements in the compound is called
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| subscript | shows the number of atoms of an element in a molecule.
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| reactants | The materials you have at the beginning of a chemical reaction are
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| products | When the reaction is complete, you have different materials, called the ____ of the reaction.
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| Conservation of matter | The principle stating that matter is not created or destroyed during a chemical reaction is
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| Coefficient | is a number in front of a chemical formula in the equation.
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| Synthesis | When two or more substances (elements or compounds) combine to make a more complex substance, the process is called
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| Decomposition | reaction breaks down compounds into simpler products.
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| replacement reaction | a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places, is called a
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| Exothermic reaction | A reaction that releases energy in the form of heat is called
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| endothermic reaction | A reaction that absorbs energy is called an
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| Activation Energy | is the minimum amount of energy that has to be added to start a reaction.
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| Concentration | is the amount of one material in a given 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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| Enzymes | provide a surface on which reactions take places.
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| inhibitor | A material used to decrease the rate of a reaction is called an
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| Combustion | a Rapid reaction between oxygen and a substance called a fuel
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| Fuel | is a material that releases energy when it burns
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