How can we tell when something is polar or non-polar in an inter-molecular force?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

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What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate