Chemistry, 09.12.2020 02:40 pulidoshorty
Discuss the difference in the densities of the two types of Earth's crust. Why are they different?
Answers: 2
Chemistry, 21.06.2019 15:30
How to solve 4 nh3(g) + 5 o2(g) > 4 no(g) + 6 h2o(g) in chemistry
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Chemistry, 21.06.2019 20:30
Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presiĂłn. Âżcual será el volumen del gas a condiciones normales? sĂ el gas es oxĂgeno, Âżcuál será su peso? y Âżcuántas molĂ©culas están presentes en el sistema?
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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 13:30
Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves
Answers: 1
Discuss the difference in the densities of the two types of Earth's crust. Why are they different?
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