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Tasks
Task 1: Hydrogen bond is a weak bond in terms of bond energy but very important in deciding physical and chemical properties of few important molecules. Discuss three examples of molecules having hydrogen bonding and their important properties. Answer must include scientific information about:
a. Effect of hydrogen bonding on physical and chemical properties of those molecules.
b. How the property of molecules change if Hydrogen bond is not present in the molecule.
c. Structure, data and technical explanations for observations.
(Word limit 750 words)
Task 2: Position of an element in modern periodic table is important factor in deciding its physical and chemical properties like reactivity of compounds, nature of bonding etc. Considering this observation answer following questions:
i. Suggest which block and group elements preferably make ionic bonding and covalent bonding. Justify answer with proper example and data. (Word limit 500 words)
ii. Discuss how the discovery of modern periodic table has made the study of physical and chemical properties of elements easy and scientific? (Word limit 500 words)
If aluminum, with an atomic weight of 27, combines with oxygen, with an atomic weight of 16, to form aluminun oxide, how much aluminum would be required to react completly with 84g if oxygen
The following temperature/ composition data were obtained for a mixture of two liquids A and B at 1.00 atm, where x is the mole fraction in liquid and y the mole fraction in the vapor at equilibrium.
An object has a mass of 185 grams, and density of 1.27 g/mL. What is the volume of this object, in milliters?
Calcium chloride reacts with silver nitrate. how many moles of AgCl are produced when 0.50 mol of CaCl2 reacts with an excess of AgNO3
Polyethylene is a polymer consisting of only carbon and hydrogen. If 2.300 g of the polymer is burned in oxygen it produces
To what volume should you dilute 124 mL of an 7.95 M CuCl2 solution so that 49.5 mL of the diluted solution contains 5.8 g CuCl2
suppose you had a detection device that could count every decay from a radioactive sample of plutonium-239 t12 is 24000
a sample of nitrogren gas is collected in a 100 mL container at a pressure of 688 mm Hg and a temperature of 565 degrees C. how many grams of nitrogen gas are present in gas sample?
This molecule has a charge of n-. By changing the overall charge, n, from 1- to 2- to 3- we get three different polyatomic ions. For each of these ions a) identify the central atom and b) determine the formal charge of the central atom, X.
The most prominent line in the spectrum of Neon is found at 865.438 nm. Other lines are found at 837.761 nm, 878.062 nm, 873.375 nm, and 1885.387 nm.
Calculate the pH of the solution that results from adding 28.0ml of 0.100M NaOH to 50.00 mL of a 0.0500 M solution of hydrochloric acid
Calculate the de Broglie wavelength of an neutron moving at 1% the speed of light. Calculate the velocity of a neutron with a wavelength of 75pm.
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