Chem 1LD Green Questions Review Pack with correct answers 100% 2026

Chem 1LD Green Questions Review Pack with correct answers 100% 2026 Why do we need to pre-rinse all glassware? - Correct Answer We pre-rinse all glassware in order to remove any chemicals that may be lingering in the glassware. If we do not pre-rinse all glassware before use, the data we collect may be altered and inaccurate. Why is it okay to reuse the same glassware for all the solutions above? Which step would you have to repeat each time if you used a new volumetric flask for each ratio? - Correct Answer It is okay to reuse the same glassware because we are only using each glassware for the exact same solution. EtOH had its own glassware and H2O had its own glassware. The solution in the glassware are also being drawn from the same ratio and are dispensed into their own beakers. If we were to use a new volumetric flask for each ratio then we would have to pre-rinse before/after each chemical being used. This would take more time. According to section 2.2 of the SDS sheets, what should you do if you or a labmate inhales the fumes from heptane or acetone? - Correct Answer If my labmate were to inhale the fumes from heptane or acetone, I would immediately notify a TA and take my labmate outside to get some fresh air. Then I would loosen their clothing and put them into a comfortable position, if necessary. If they do not feel well, I would get medical assistance. Which chemical is the bottom layer and which chemical is the top layer (Figure 2)? What physical property determines this? - Correct Answer The top layer is ethyl acetate and the bottom layer is DI water. Ethyl acetate is a nonpolar liquid that is less dense than DI water which is polar liquid. What happens if you shake it vigorously? - Correct Answer It is possible for an emulsion to form when shaking the separation funnel too quickly. The food coloring has mixed with the DI water layer What physical property causes this? - Correct Answer Both DI water and food coloring are polar liquids which is why they mix. They are miscible. Ethyl acetate is a polar liquid, but it lacks the ability to form H bonds like water and food color do, which is why it does not mix with the polar food coloring. This obeys the theory of "like dissolves like." Why will the funnel not drain if you do not follow this step? - Correct Answer If the glass stopper is not removed, then the lack of atmospheric pressure and the formed vacuum will prevent the solution from draining. Why can the aqueous layer + food coloring be poured down the drain but not the organic layer? - Correct Answer The organic layer ethyl acetate is a highly nonpolar solution. These types of solutions are very volatile and flammable, and they are not able to mix with water (as seen in the video.) However, the aqueous layer and food coloring are miscible and polar solutions. They are do not pose a great threat to the environment. What do the pressure and temperature values in open air tell you about the nature of lab work