Which of the following does not have eight valence electrons?  

The ________ ion has a noble gas electron configuration. 

A sample of gas originally at 25 °C and 1.00 atm pressure in a 2.5 L container is subject to a pressure of 0.85 atm and a temperature of 15 °C. The final volume of the gas is ________ L. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

The Lewis structure of AsH3 shows ________ nonbonding electron pair(s) on As.

What are the respective concentrations (M) of Fe3+ and I- afforded by dissolving 0.200 mol FeI3 in water and diluting to 725 mL? YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

Arrange the following gases in order of increasing average molecular speed at 25 °C.                                           He, O2, CO2, N2

 When the following equation is balanced, the coefficients are ________.                                       Al(NO3)3 + Na2S → Al2S3 + NaNO3

The correct answer (reported to the proper number of significant figures) to the following is _______.                                           6.3 × 3.25 = ________

A 17.2 g sample of potassium chlorate is dissolved in 250 g of water at 65 °C. The solution is cooled to 30.0 °C and no precipitate is observed. This solution is ________.

Which one of the following conditions would always increase the internal energy of a system?