Calculate the lattice energy of calcium chloride given that the heat of sublimation of Ca is 121 kJ/mol and ¢H°f (CaCl2) 5 2795 kJ/mol.

The diameter of an average size penny was found to be 1.95 cm. Which digit in the diameter of the penny represents the estimated digit? A 1 B 9 C 5

Which of the following is the correct word equation for the reaction described below? Mercury (II) oxide breaks down when it is heated to form oxygen gas and liquid mercury.

The variety of organism living in an area

Why is it important for the nuclear membrane to disintegrate during mitosis

How is a bunsen burner different than burning a candle?

Cracks in rocks chemical or mechanical

A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins. A) 0.5 sec B) 0.3 sec C) 2.3 sec D) 1.9 sec

Given 4.80g of ammonium carbonate, find: Number of moles of the compound Number of moles of ammonium ions Number of moles of carbonate ions Number of moles of hydrogen atoms Number of hydrogen atoms

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.