UMD is committed to providing a positive, safe, and inclusive place for all who study and work here. Making hostile, threatening, discriminatory or disparaging remarks toward or about the instructor, other members of the class or groups of people [willnot] be tolerated. 

The electron configuration of a manganese (Mn) ion is [Ar] 3d3.  What is the charge on this ion?

How many nitrogen atoms are there in 51.0 g of (NH4)2SO4 (ammonium sulfate, 132.14 g/mol)?

How often should you check your d.umn.edu email/Canvas Announcements for information about this course?

Complete the orbital diagram for a ground state chlorine atom matching the letters in the boxes to their corresponding numbers/arrows.

Which of the following compounds contains the most hydrogen atoms per formula?

The electron configuration of a manganese (Mn) ion is [Ar] 3d3.  What is the charge on this ion?

What is the ground-state electron configuration of titanium (Ti)?

When a 45.0 g sample of an alloy at 100.0°C is dropped into 100.0 g of water at 25.0°C, the final temperature is 37.0°C.  What is the specific heat of the alloy?  The specific heat of H2O(l) is  4.184 J∙g–1∙°C–1. 

Anthracene is a polycyclic aromatic hydrocarbon that is a component of tar. Mass analysis reveals that it has the empirical formula C7H5. If the molar mass is 178.23 g/mol, which molecular formula is correct?