What is the formal charge on nitrogen in the nitrate ion?           Data sheet and Periodic Table

What is the atomic number of an ion with a –2 charge when it has 18 electrons?   Data sheet and Periodic Table

How many valence electrons are in one acetate ion, CH3COO–?  Data sheet and Periodic Table

In the compound (NH4)2S2O3, which element is present in the largest percent by mass?  Data sheet and Periodic Table

What is the final temperature when a 5.0 g sample of brass initially at 25 oC absorbs 75 J of heat?  The specific heat of brass is 0.38 J·g–1·°C–1. Data sheet and Periodic Table

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.Data sheet and Periodic Table

Which arrow on the phase diagram corresponds to the particle-level phase change shown?         Data sheet and Periodic Table

Which set of quantum numbers is correct and consistent with n = 4?  Data sheet and Periodic Table

What is the formal charge on nitrogen in the nitrate ion?           Data sheet and Periodic Table

What is the orbital diagram for the valence electrons in a ground state atom of nitrogen?   Data sheet and Periodic Table