Atoms that have the same number of valence electrons in their outer shell

How many moles of phosphorus are in 12.0 grams of phosphorus

Explain how you can estimate the number of neutrons in the atoms of an element.

Real gases may be expected to deviate from Charles' Law at A.) low B.) medium C.) high pressures near the A.) liquefaction B.) melting C.) freezing temperature.

Which of these does not describe a significant ethical dilemma in the drug industry? A. A new drug effectively relieves blood pressure but erodes the stomach's lining. B.

Is smoke a solution, colloid, or suspension

A 27.40 g sample of liquid mercury is initially at 158.30°C. If the sample is heated at constant pressure ( = 1 atm), kJ of energy are needed to raise the temperature of the sample to 376.20°C. How much energy in kJ is required?

When a sample of gas is cooled, it condenses into a liquid. In which of the following ways do the molecules of the original gas sample compare with the molecules of the liquid? a. The molecules weigh less as a gas than they do as a liquid. b.

In a group 1 analysis, a student obtained a precipitate containing both AgCl and PbCh. Which of the following reagents would enable separation of AgCl (s) from PbCl (s) ? O Hys 0 Na2CO3 o KOH O NH3 O

Round to four significant figures 0.00238866

Gases are unique because it is the only phase that can be compressed can flow is composed of moving particles cannot be compressed