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the time required for half the atoms present in an object have undergone radioactive decay and changed into something else.
molecular covalent compounds that do not conduct electricity in water.
numbers that are used to keep track of the transfer of electrons during redox reactions.
group or organic hydrocarbons, having single bonds between carbon atoms.
small electrical cells such as those in watches, pacemakers, hearing aids and calculators.
calculating the volume of a substance when the volume of another substance is given.