Waiting for the popcorn to finish popping so we can enjoy.
Weighing the popcorn!
It looks delicious!
Question: Will the total mass of the popcorn stay the same as the mass of the kernels?
Hypothesis: If the temperature and the volume go up, resulting in popcorn, then the popcorn will have the same amount of matter as the kernel because the mass stays the same during a chemical change according to the Law of Conversation of Mass.
Materials: Air popper, serving bowl, kernels for making popcorn.
Procedures:
1. First, take some kernels out of the bag.
2. The, distribute the kernels to each group.
3. After that, count how many kernels your group has.
4. After you have the total number of kernels in your group, weigh them.
5. After you weigh the kernels, pour them into the serving bowl.
6. Then, pop the kernels.
7. When you have popcorn, take it out of the air popper.
8. Then, weigh your popcorn.
9. Count how much popcorn you have.
10. If there is any fluctuation, record your information.
11. Then, see why there is a difference.
12. Write your conclusion.
13. You are finished with this delicious lab. Have fun!
Data: Before After
Total Mass: 522 kernels 408 popcorn and about 20 unpopped kernels
Amount of kernels: 190.1 g 170.7 g
Conclusion: According to the Law of Conservation of Gas the mass should be the same before and after a chemical change, but in our group, the mass decreased from 190.1 grams to 170.7 grams, and the total amount changed from 522 kernels to 408 popcorn and there were 20 unpopped kernels at the end. The mass was different because some of the mass changed to become a gas, and it evaporated.
Popcorn Lab:
1)According to the
Law of Conservation of Mass, the mass of 4 kernels before being popped should
be (more than, the same, less than) after being popped.
According to the Law of Conservation of Mass, the mass of 4 kernels before being popped should be the same after being popped
2) In reality, the mass before was (more or less) than
after.
In reality, the mass before was more than the mass after.
3) Explain why the mass of the kernels (before and after)
was different (hint: use states of matter and water in your explanation).
The mass of the kernels after was different than the mass of the popcorn after, because some of the mass evaporated straight from a solid kernel to a gas, and that is why that mass is not included in the total mass.
4) Why does the popcorn, pop?Explain this using the gas laws.(Hint: What is the relationship between
temperature & volume.Don’t forget
about pressure).
Popcorn pops because according to Boyles's Law, as the temperature stays at a constant amount, the volume increased and the pressure decreased.
5)Define heat and
explain why heat conducts best through a solid?
Heat conducts best through a solid, because the particles in a solid are in one place so the heat can travel better than in a liquid or a gas, where the particles have some movement.