Periodic+Pop+Quiz

The "periodic pop quiz" serves as a "random" check of student knowledge as well as a quick way to assess if students are keeping up with their learning. Not everyone will participate in the pop quiz- only 1 person per group, but this person is RANDOM so its important that students work together to learn the material. As you are walking around and observing group work you may decide that its time for a pop quiz, but you really don't want to come up with 5 questions for everyone to answer. Simple, pull one student aside so you don't disturb all productive work, and ask that student to solve a problem for you. If they answer correctly their group get full credit; incorrect answers can either result in a zero for that question or you may want to take a point or two away from another assignment. It is highly encouraged that if a student fails to answer correctly that you give this student the rest of the period to "relearn" the material. However, you must be sure to give this student a completely different problem, preferably solving for a different variable. This way you aren't teaching students to simply learn how to solve these problems in only one way, for only one variable.


 * **Sample pop quiz questions** || **Answers** ||
 * 1) What is the specific heat of a substance that absorbs 2.5 x 103 joules of heat when a sample

of 1.0 x 104 g of the substance increases in temperature from 10.0C to 70.0C?

2) A 1.0 kg sample of metal with a specific heat of 0.50 KJ/KgC is heated to 100.0C and then

placed in a 50.0 g sample of water at 20.0C. What is the final temperature of the metal and

the water?

3) A 2.8 kg sample of a metal with a specific heat of 0.43KJ/KgC is heated to 100.0C then

placed in a 50.0 g sample of water at 30.0C. What is the final temperature of the metal and

the water? || 1) cp = 0.0042 J/gC 2) final temperature of metal and water is 76C 3) final temperature of metal and water is 97C || You can reuse these problems over and over by simply changing the numbers in the problem. Be sure to solve them yourself first!

Additional resources: [|Specific Heat Capacity Problems]

