When atoms bond together to form molecules, they share or give electrons. If the electrons are shared equally by the atoms, then there is no resulting charge and the molecule is nonpolar.
The CH4 molecule has the lowest molecular weight, so it has the lowest boiling point.
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Answer: D, splitting water into hydrogen and oxygen is a chemical change.
The Answer to your question would be A
The closeness of a measurement to its true value is a measure of its Accuracy.