SCH4U - Chemistry 12 (2024-25) - A

Energy changes in chemical reactions and changes of state can be directly connected to the processes that are occuring at the molecular level.  During changes of state, molecules move closer together or further apart which requires either the absorption or release of energy.  Chemical reactions involve the breaking or forming of bonds which again involves the absorption or release of energy.  By understanding the molecular processes that occur during these processes, chemists can predict energy changes that may occur, and conversely, by measuring energy changes, they can predict the types of reactions occuring in an unknown process.

Learning Goals:

By the end of this lesson you will:

• • • Understand and predict the energy changes associated with changes of state.
    • Understand and predict the energy changes associated with chemical reactions in which bonds are broken and bonds are formed.
    • Understand the energy changes associated with nuclear reactions: fission & fusion.

Success Criteria:

I know I have achieved the learning goals when I can predict and explain the energy changes that occur when matter changes state, when chemical bonds are broken or formed and during nuclear reactions.