science vocabulary
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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| law of conservation of mass | The law implies that mass can neither be created nor destroyed.states that the mass of an isolated system (closed to all matter and energy) will remain constant over time.
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| physical change | Physical changes are changes affecting the form of a chemical substance
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| chemical change | Chemical changes occur when a substance combines with another to form a new substance
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| element | one of a class of substances that cannot be separated into simpler substances by chemical means.
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| chemical formula | a way of expressing information about the atoms that constitute a particular chemical compound.
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| element molecule | the smallest particle in a chemical element or compound that has the chemical properties of that element or compound.
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| compound molecule | a compound made of 2 or more nonmetal elements
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| chemical equation | A symbolic representation of what happens when chemicals come in contact with one another.
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| chemical reaction | A process in which one or more substances (reactants) are chemically changed into one or more new substances
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| reactants | A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction.
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| products | A substance resulting from a chemical reaction.
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| coefficent | numerical measure of a physical or chemical property that is constant for a system under specified conditions
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| subscript | It is the number of atoms in the preceding element.
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