Physical Chemistry Answers

1) 89.3 Joules of heat is required to raise the temperature of 10.0 grams of copper by 100 degrees celsius . Calculate the heat capacity of copper?

2) 88.2 Joules of heat raises temperature of 45.8 grams lead by 15.0 degrees celsius. Calculate the specific heat capacity of lead?

Calculate the amount of calcium chloride (MW = 147.02 g/mol) required to make a 20 mM solution in the 500 ml of a 200 mM triethanolamine

In the distribution of succinic acid between ether and water at 15ºC, 20 ml of the ether layer contains 0.092 g of the acid. Find out the weight of the acid present in 50 ml of the aqueous solution in equilibrium with it if the distribution coefficient for succinic acid between water and ether is 5.2

calculate how much myoglobin (MW= 16,700) is required to prepare 250ml of a 1.5 mg/ml in a mM HCl solution to carry out an oxygen binding experiment. Please provide the numerical value in mg without units and terms

(a). Mass spectrometry (MS) is a powerful analytical technique widely used by chemists, biologists, medical researchers, and environmental and forensic scientists, among others. (i). Describe how the two methods, Electron and Chemical ionization methods are used in the gas phase to generate ion fragments for generation of mass spectra of compounds. (ii). Explain main differences between the two methods and explain why they are considered to be complementary to each other. (b). The following spectra A and B are for 2-methyl-2-hexene and 2-heptene, not necessarily in that order. Decide which spectrum belongs to the correct molecule. Explain your answers

Explain in details the theory behind the atomic spectroscopy which embraces AAS, AES and AFS. (ii). Briefly explain the different principles in the AAS, AES and AFS. (iii). Explain how the Hollow Cathode Lamp (HCL) functions and what is its role in the Atomic spectrometry. (iv). Distinguish clearly between Flame photometry and the Electrothermal atomic spectroscopy. 

What is the procedure for obtaining an alkyl group?

A. Removal of a hydrogen atom from an alkane

B. Cyclic transformation

C. Nitration

D. Sulphonation

When solutions of barium Chloride and sodium sulphate are mixed, the spectator ions in the resulting reaction are?

In a certain reaction, 3.45g of Sodium reacted with 5.43g of Chlorine. What is the mass of the product formed in mg

A. 3.45 x 10^-3 mg

B. 5.43 x 10^-4 mg

C. 5.345 x 10^-5 mg

D. 3.4 x 10^-2 mg

Lithium atom has two naturally occurring isotopes ₂⁶Li and ₂⁷Li. Given that the relative molecular mass of Lithium is 6.94. What is the abundance of these isotopes?