Consider an unknown metal sample that weighs 10.0 g. If the unknown metal absorbs 309 J of energy to heat up from 10.0°C to 27.0°C, what is the most likely identity of the metal?  

What is the oxidation number for the chlorine atom in the compound, potassium perchlorate, KClO4?

Three separate 3.5 g blocks of Sn, Hg and Cr are heated from 25°C is heated to 75°C. Which block requires absorbtion of the most amount of heat (q) to reach the final temperature?  

Consider the reaction where hydrogen gas reacts with bromine gas to form hydrogen bromide gas: H2 (g) + Br2 (g) →  2 HBr (g)      

Consider the reaction below: H2S (g) + Cl2 (g) → S (s) + 2 HCl (g) The element                   is undergoing reduction and                     is the reducing agent.

A system releases 89 kJ of heat and has 111 kJ of work done on it. What is the value of ΔE (in kJ) for the system?

Of the following, the heat of formation,  ΔH°f, is zero for              .  

In this first week, which of the following unusual diseases was NOT reported?

In this first week, which of the following is NOT a food that caused disease?

  Identify number 8