Chemistry, 04.09.2019 00:30, my7butterflies
Aneutral isotope has a mass number of 65 and 36 neutrons. identify the element symbol of this isotope and determine the number of protons and electrons.
Answers: 3
Chemistry, 22.06.2019 02:10, fvmousdiana
Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %
Answers: 2
Chemistry, 22.06.2019 05:50, mrylenastewart
What are transitions between a liquid and a solid called? identify which way they are transitioning
Answers: 2
Chemistry, 22.06.2019 08:00, katelyn0579
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 14:40, elawnnalewis4855
Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d
Answers: 2
Aneutral isotope has a mass number of 65 and 36 neutrons. identify the element symbol of this isotop...
Mathematics, 31.12.2019 05:31
Mathematics, 31.12.2019 05:31
Mathematics, 31.12.2019 05:31
Mathematics, 31.12.2019 05:31
World Languages, 31.12.2019 05:31
Mathematics, 31.12.2019 05:31