1-The standard enthalpy change for the combustion of 1 mole of propane is -2043.

-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