Understanding molecular behaviour.

Are the following questions true or false? If false explain why. a) A carboxylic acid favours the ion form (R-COO-) and its pH is higher than its pKa. b)In most membranes, the polar heads of the phospholipids align towards the middle of the membrane. c)All proteins contain either an alpha helix or beta sheets.

Calculate the weight percentage of chloromycetin in the sample

Chloromycetin is an antibiotic with the formula C11H12O5N2CL2. A 1.03-g sample of an phthalmic ointement contining choloromycetin was chemically treated so as to convert its chlorine into Cl~ ions. The Cl~ was then precipitated as AgCl. If the AgCl weighed .0129g, calculate the weight percentage of chloromycetin in the sample.

Step-wise procedure for balancing redox reactions

Balance the following redox reaction: MnO4-(aq) + C2O42-(aq) -> Mn2+(aq) + CO2(g)

Calculating the amount of material reduced through electrolysis

Calculate the amount of gold deposited (in grams) from a solution of Au3+ if the electrolysis lasted 30 minutes at a current of 5.00A.

Synthesis and Analysis of a Transition Metal Complex

I need help with my lab. Here are the questions. What is the Calculation of % yeild of hexaamminenickel (II) Chloride? use 7 grams of NiCl26H2O and its mass is 237.71. I got 6.83g but what is its % yeild? It asked to estimate the amount of hexaaminenickel chloride that is neutralized by 25 ml of 0.10 M HCL and I got 97mg. The mass I started with Ni(NH3)6Cl2 for trail 1 and trail 2 are both 100 mg. The molarity std HCl for both trail is .1M and the vol I titrated for Trail 1 is 26.8 ml and Trail 2 is 25.8 ml from the buret. From the given information, please answer: (a) the moles of HCl used for both trail (b) the moles of NH3 in product for both trail (c) the mass of NH3 in pr... click for more