2. Which statement concerning Hess's Law is FALSE?
the change in enthalpy is the same regardless of the number of steps DH is also reversed">if reaction is reversed, the sign of DH is also reversed DH is directly proportional to the quantities of reactants and products in a reaction">the magnitude of DH is directly proportional to the quantities of reactants and products in a reaction DH indicates the direction of heat flow">the sign of DH indicates the direction of heat flow all statements are true

3. Petroleum is mainly composed of a compound called:
helium krypton sodium energy hydrocarbons

4. Which statement is FALSE?
extensive properties depend directly on the amount of substance temperature is an extensive property intensive properties do not depend on the amount of substance mass is an extensive property all statements are true

5. What is pyrolytic cracking?
process in which larger kerosene molecules are broken down into smaller molecules of hydrocarbon a procedure in which a more a practical source of energy is produced the use of pyrotechnics to mine coal a process of coal conversion none of the above

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