Chemistry, 22.05.2020 02:08 onlymyworld27
Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture if you can. Sample A is 100 g of a coarse grey powder with a faint unpleasant smell. 15.0 g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. Most of the powder disappears, but of a gritty black sand-like material is left on the surface of the paper. Pouring more water over the black material doesn't change how much of it there is. Sample B is 100 ml of a clear liquid. The density of the liquid is measured and turns out to be 0.77 g/ml. The liquid is heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04 g/ml. (a) Is sample A made from a pure substance or a mixture?(b) Is sample B made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide."
Answers: 2
Chemistry, 22.06.2019 01:00, chrisxxxrv24
What are the variables in gay-lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas
Answers: 1
Chemistry, 22.06.2019 02:50, jordan5778
What is the overall order of reaction for rate = k[no]2[o2]
Answers: 3
Chemistry, 22.06.2019 05:40, Maryjasmine8001
Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml
Answers: 2
Read the descriptions below of two substances and an experiment on each. Decide whether the result o...
Mathematics, 21.05.2021 01:20
Social Studies, 21.05.2021 01:20
Mathematics, 21.05.2021 01:20
Mathematics, 21.05.2021 01:20
Mathematics, 21.05.2021 01:20
Chemistry, 21.05.2021 01:20
Mathematics, 21.05.2021 01:20
English, 21.05.2021 01:20