Marshmallow Calorimetry

~Marshmallow Calorimetry~

In this lab I learned a lot about how energy is transferred as well as how much energy can be in something. A small marshmallow could have more energy per gram than a large marshmallow. I learned that not everything is as straight-forward as it would seem. 

Extension (3) : We could use ice and the formula q=mHf to calculate the heat emitted from the marshmallow by knowing the ices temperature. We know the melting and boiling point of ice, there-go we can know the amount of temperature change that the ice went through when the heat was emitted from the marshmallow.

Thermal Energy

~Thermal Energy~

The metal block feels cooler than the wooden block because the metal block absorbs the thermal energy from our skin at a faster rate than wood. This makes it feel as if the metal block is colder even though they are the same temperature.

The metal block melted the ice faster because it was absorbing the heat from the metal block faster than it did the wood.

EXTENSION:
- Although there are no particles between the earth and the sun, the earth is still heated by the sun due to radiation. Heat is transferred through empty space by thermal radiation, often called infrared radiation.

Heating Curves

~Heating Curves~

I learned about heating curves!

I found the heating of ice to its melting and boiling point, the temperature does not increase very fast. With the experiment my group tested, saltwater slowly rose for a bit of time and then started to increase much faster. Sugar and Salt could change the way the heating curve was. 

I would think the cooling curve would be slightly similar to the heating curve. I think it wouldn't decrease immediately, but then slowly increase at its cooling rate.

5.2

~Molecules~

In 5.2 we learned about molecules and covalent bonds.We learned how atoms can share electrons. We also learned how to draw Lewis structures properly. We learned how to apply the relationship between bond energy and length of single, double, and triple bonds. Finally, we learned how to write names for binary covalent compounds.

Need to Know

- Difference between ionic and covalent bonds

- How nonmetals share electrons

- How to draw Lewis structures properly

- Bond energy and length of bonds

- How to write covalent compounds

5.2 was slightly challenging. The hardest part (without the flow chart) would be knowing the difference between ionic and covalent compounds and being able to write them properly.

We need to know about molecules as we move into inter-molecular forces..