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1. Using a diagram, show how the components of a discarded dry cell can be recycled based on the procedure given.
2. What are the separation techniques used in this experiment, draw the set up and explain the principle behind each technique.
3. Draw your conclusion.
Cross section of a battery
When 10.0 grams of A was heated, 4.40 grams of B was given off, leaving 5.60 grams of E. The same quantity of B can also be prepared by combination of 1.2 grams of C and 3.2 grams of D. C decomposes to form a new substance while D was found to contain two chemical elements. The E can be electrolyzed after melting to yield 4.0 grams of F and 1.6 grams of G, neither of which can be further decomposed by ordinary chemical means. E combines with water to give 1.3 grams of J per gram of E and gas L. The gas L has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen.
Identify each lettered material as element, compound and mixture.
a base.
3NaHCO3(aq)
Four litres of 0.4M 3-(N-morpholino) propane sulfonic acid (MOPS) buffer of pH 7.5 are required. Available in the laboratory are 10M HCl and 10M NaOH and the zwitterionic form of MOPS (M.Wt = 210.3). The pKa for the MOPS zwitter ion is 7.2. Describe, showing the relevant calculations, the procedure for preparing the buffer
calculate the dosage in milligrams per kilogram body weight for a 135 lb adult who takes two aspirin tablets containing 0.324 g of aspirin each. calculate the dosage for a a 40 lb child who also takes two aspirin.
Calculate the number of moles of solute present in 255 mL of 0.250 M CaBr 2.
Calculate the heat change in kilocalories for condensation of 3.5 kg
kg of steam at 100
∘
C
Draw lewis structures and spatial build of the following compounds
H2XeO4
H4XeO6
HXeO3^-1
He then started to separate lead chloride from the other cations in the group. Properly noting to maintain the mixture hot, he successfully separated the residue and the centrifugate using a micropipette. After adding Potassium Chromate solution to the centrifugate, a yellow precipitate was not observed;
