3. predict whether each of the following molecules is polar or non-polar: a) if, b) cs2, c) so3, d) pcl3, e) sf6, f) if5

a) IF = polar

b) CS2 = non-polar

c) SO3 = non-polar

d) PCl3 = polar

e) SF6 = non-polar (bonds are polar, but the molecule is non-polar, since the                                                                                                                                    net dipole moment is zero)

f) IF5 = polar

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).