Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Heat capacity is a measure of the heat required to A) expand the volume of a substance. B) evaporate a substance. C) freeze a substance. D) raise the temperature of 1 gram of a substance by 1°C

Write and balance the chemical equations for the synthesis of the triiodide and pentaiodide compounds.

2. How many moles of Na2CO3 are available? A. 566 moles B. 1,132 moles C. 13,030 moles D. 890 moles

What does the R stand for in the ideal gas law (PV=nRT) ?

What are the major causes of environmental problems?

Why is gold less reactive than iron?

Which statements about isozymes are true? Isozymes catalyze different reactions. Isozymes have identical kinetic properties. Isozymes are present in various developmental stages. Isozymes are encoded by the same gene.

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?