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

The molar enthalpy of formation for H2O(l) is –285.8 kJ·mol–1.  Which expression describes the enthalpy change for the reaction: 2H2O(l)2H2(g) + O2(g)                ΔH° = ?   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

In which reaction is carbon reduced?     Data sheet and Periodic Table

Between HI and HF, which has the higher boiling point and why?   Data sheet and Periodic Table

What is the oxidation number of nitrogen in the nitrate ion?             Data sheet and Periodic Table

Nanomaterials can effect which of the following? 

There is plenty of information on health impacts of very small, nanoengineered particles under 20nm. 

What is the standard enthalpy change for the reaction?  2NH3(g)N2H4(l) + H2(g) N2H4(l) + O2(g)N2(g) + 2H2O(g)               ΔH°1 = –543 kJ·mol–1 2H2(g) + O2(g)2H2O(g)                              ΔH°2 = –484 kJ·mol–1 N2(g) + 3H2(g)2NH3(g)                               ΔH°3= –92 kJ·mol–1     Data sheet and Periodic Table

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