Chemistry, 17.10.2020 21:01 annikafischer
Part A
In this activity, you'll grow bacteria in four prepared petri dishes. The first petri dish will have a sample
swabbed from your unwashed hands. The second petri dish will have a sample swabbed from your hands
after washing them with regular soap. The third petri dish will contain another sample from your
unwashed hands. The fourth petri dish will contain a sample taken after cleaning your hands with hand
sanitizer. What do you think the results will be? Write down your predictions for which samples will show
the greatest and least bacteria growth.
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Chemistry, 21.06.2019 14:00
Which of the following best defines homeostasis? forming identical cells breaking down glucose maintaining stable internal conditions increasing an organism's temperature
Answers: 3
Chemistry, 22.06.2019 08:00
Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?
Answers: 1
Chemistry, 22.06.2019 08:30
What are the first three quantum numbers for the electrons located in subshell 2s?
Answers: 2
Chemistry, 22.06.2019 14:30
Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous
Answers: 1
Part A
In this activity, you'll grow bacteria in four prepared petri dishes. The first petri dish w...
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