Which contain polar bonds?

I. carbon dioxide, CO2

II. ammonia, NH3

III. methane, CH4

Your roll: experienced electron speech is adressed to: a new "freshman class" of electrons job: write a speech task: you are to pretend that you are giving a speech to a new group of electrons. be sure to mention their placement in an atom, their charge, and their role in chemical bonding (ionic and covalent) be specific!

In a floral arrangement, the focal area is often

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland