Copy of Module 2 Week 2 - Individual worksheet template

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School

Michigan State University *

*We aren’t endorsed by this school

Course

LB172L

Subject

Chemistry

Date

Feb 20, 2024

Type

pdf

Pages

Uploaded by MagistrateMusic9946

LB 172L - CARBON DIOXIDE Individual summative writing. What did you learn? (8 pts) After your conference with your LAs, every individual should turn in an explanation to D2L. Each C-E-R can be written in three, complete sentences. What does it mean for a substance to be a greenhouse gas? ● Your explanation should address both the molecular and the macroscopic levels. ● A good explanation will put all of the pieces together from each of the lab components in a short and easy-to-understand explanation using claim-evidence-reasoning format. You are expected to pull data (spectra, screenshot of simulation, graph, values) from the group worksheet. A substance is a greenhouse gas if it has the ability to emit and absorb IR radiation, leading to the greenhouse effect. This ability is found in molecules that have dipoles which have a specific vibrational mode that match with the frequencies of IR radiation that causes absorption to occur. The NIST website shows that molecules like O2 and N2 don’t have an IR spectra because they are linear molecules that are non-polar or don’t have dipoles. This shows that atoms have to have matching vibrational modes to IR radiation and have to have dipoles in order to be a greenhouse gas. Is CO 2 a greenhouse gas? If yes, how does it act as a greenhouse gas? ● Your explanation should address both the molecular and the macroscopic levels. ● A good explanation will put all of the pieces together from each of the lab components in a short and easy-to-understand explanation using claim-evidence-reasoning format. You are expected to pull data (spectra, screenshot of simulation, graph, values) from the group worksheet. Yes, carbon dioxide (CO2) is a greenhouse gas. At the molecular level, CO2 absorbs and emits infrared radiation. In the Earth's atmosphere, solar radiation from the sun reaches the Earth's surface, and the Earth then emits infrared radiation back into space. CO2 absorbs the infrared radiation, stopping it from escaping directly into space, and instead re-emitting it back toward the Earth's surface and into the atmosphere. The absorption and re-emission of infrared radiation occur due to the vibration of the molecules. Looking at the “Collisional Heating in the Atmosphere” simulation, you can see that at 2350 cm^-1 and 675 cm^-1, the photon is absorbed but not at 1800 cm^-1. This shows that there are specific frequencies that coincide with the atoms in CO2, causing them to vibrate in a specific direction. In the case of CO2, it has a change in dipole moment that can absorb IR radiation in the Earth's emission spectrum. How well did your group work together on the group worksheet? Are you happy with how the work was shared and the timeliness of everyone’s contributions? What could YOU have done differently to better work with your group? Is there anything the teaching team should know? Is there any support / intervention / encouragement you or your group would like? (This question won’t be graded, but will be part of our “early warning system” about group issues.) 1

We worked well together to complete the worksheet, although I feel like there were some parts that were shared unequally. This was only due to time conflicts that were sorted out beforehand and will be solved for next time. I did have some conflicting events that made it so I couldn’t work on it as much as I had hoped but this issue won’t be recurring. I think our group collaborated well and we don’t need any intervention at this point. 2

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