science vocab
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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| This principle is equivalent to the conservation of energy, in the sense when energy or mass is enclosed in a system and none is allowed in or out, its quantity cannot otherwise change (hence, its quantity is "conserved"). | law of conervation of mass
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| occur when objects or substances undergo a change that does not change their chemical composition | physical changes
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| occur when a substance combines with another to form a new substance | chemical change
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| one of a class of substances that cannot be separated into simpler substances by chemical means. | element
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| molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound. | chemical fomula
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| are molecules composed only of two atoms, of either the same or different chemical elements. | element (diatomic) molecule
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| a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds. | compound molecule
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| the symbolic representation of a chemical reaction where the reactant entities are given on the left hand side and the product entities on the right hand side | chemical equation
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| a process that leads to the transformation of one set of chemical substances to another. | chemical reaction
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| gives the reactants and products | reaction (in a chemical equation)
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| Chemical reactions are really the rearrangement of the connectivity between the atoms in the reagenmts to produce products | product ( in a chemical equation)
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| the numbers of molecules of reactants or product. | coefficient (in a chemical equation)
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| Subscripts are numbers used to tell you how many atoms of an element are present in the equation | subscript (in a chemical)
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