1-The standard enthalpy change for the combustion of 1 mole

-241.8

 +104.7 kJ/mol
 -104.7 kJ/mol
 -4190.7 kJ/mol
-2043.0 kJ/mol
 +1407.7 kJ/mol

2-
Place the following atoms in order of increasing atomic radii: K, Na, Be, and Li?

 Li < Na < K < Be
 Be < K < Na < Li
 Be < Li < Na < K
 K < Na < Li < Be
 Li < Be < Na < K

3- The central atom in the triiodide ion, I3-, is surrounded by

 one single bond, one double bond, and one lone pair of electrons.
 two single bonds and no lone pairs of electrons.
 two double bonds and one lone pair of electrons.
 two single bonds and two lone pairs of electrons.
 two single bonds and three lone pairs of electrons.

4-
The ____ of a photon of light is ____ proportional to its frequency and ____ proportional to its wavelength.

energy, directly, inversely
 velocity, directly, inversely
 amplitude, directly, inversely
 intensity, inversely, directly
energy, inversely, directly