16. calculate the amount of heat energy that is needed (7. calcula
to raise the temperature of 1000.0 g of sand from ll released
21.1 °c to 37.8 °c
temperat
q=m*c*a+
a = (1000.0 g)(0.670 j/g°c)(37.8 °c-21.1 °c)
a = 11189 j
q = 11200 j (sig figs)
18. if 11.500 t of energy is added to a 1000,0 9
19. if 11

What is the maximum number of electrons that an atomic orbital can contain?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°