1. 2Cr(OH)₃ + 3Br₂+ 10OH^-6Br^- + 2CrO₄^2-+ 8H₂O

In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.

2. A tank contains 231 gallons of oil. This is the equivalent of 3.38×10¹⁰ J of energy. How many BTU of energy does this oil represent?

BTU

3. A gas is compressed and during this process the surroundings do 143 J of work on the gas. At the same time, the gas absorbs 206 J of heat from the surroundings. What is the change in the internal energy of the gas? 

J

4. The nutritional label on the package indicates that a package of crackers contains 140. Calories. Express this value in kJ and in J.

5.  chemical reaction is run in which 263 Joules of heat are generated and the internal energy changes by -128 Joules.  

What is w for the reacting system?

w =   Joules

6. A chemical reaction is run in which 263 Joules of heat are generated and 729 Joules of work are done by the system.  

Calculate the change in the internal energy of the chemical system.

E =   Joules