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How to tell if a molecule is polar or nonpolar with electronegativity

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Global climatic patterns are changing because of the melting of polar ice caps. the melting of polar ice caps is an example of the interaction between the atmosphere and cryosphere cryosphere and geosphere hydrosphere and geosphere biosphere and cryosphere