Three hundred joules of heat are added to a system. The system uses 140 joules to do work.

By how much did the internal energy of the system change?

a 140 J

b 160 J

c 240 J

d 440 J

One chlorine atom combines with one sodium atom. how many potassium atoms do you think combine with a chlorine atom?

Make sure you have a copy of the Plan an Investigation Student Guide for this lab. Also, be sure to follow all safety guidelines. If you need to review them, refer to the Lab Safety Agreement. Use the drop-down menus to answer the questions.

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