The hottest stars appear bluish and are around what temperature?
A. 20,000 degrees Celsius
B. 15,000 degrees Celsius
C. 8,000 degrees Celsius
D. 3,000 degrees Celsius

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.