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Is Aluminium (Al) a network solid or molecular solid? What is the nature of the forces of attraction in it? Explain in terms of their structures why each of the following pairs of substances have very different chemical and physical properties? (a) silica and carbon dioxide (b) oxygen and sulfur Explain the difference between a cubic close packed structure and a hexagonal close packed structure
What property of the atom did Moseley associate with the wavelength of X-rays emitted from an element in his experiments?
Outline a reasonable synthetic scheme to effect the conversion of cyclohexene to 2-ketoheptanoic acid
which compartment (A or B) will increase in volume for each of the following pairs of solutions separated by a semipermiable membranes: a) A.20%(m/v) starch B.10%(m/v) starch. b) A.10%(m/v) albumin B.2%(m/v) albumin. c) A. .5%(m/v) sucrose B. 5%(m..
A 2.00L flask originally containing 0.500M disulfur decaflouride is allowed to reach equilibrium and found to contain 0.023M disulfur decaflouride. If an additional 0.125mol of the disulfur decaflouride is added and equilibrium re-established, wha..
A list of the calorie content of foods indicates that a 10 oz chocolate thick shake contains 331 Calories. Express this value in kJ and in J
Dimethyl ether and ethanol are structural isomers of C2H6O. Which one will have a higher boiling point? Explain why and do the same for their melting points.
what volume will a 300.0 mL sample of gas at STP occupy when the pressure is doubled at constant temperature
Phenol is a weak organic acid with Ka=1.0x10^-10. How many grams of phenol do you need to add to 500. mL of water to make a pH=5.75 solution
solution of the nonvolatile solute ethylene glycol, C2H4(OH)2, in water is prepared. Calculate the vapor pressure of the solution to three significant figures.
Calculate the concentration of chloride ions when 100.0 mL of 0.205 M sodium chloride is mixed with 250.0 mL of 0.150 M calcium chloride.
The famous Hope Diamond at the Smithsonian National Museum of Natural History wieghs 45.52 carats. Diamond is a crystalline form of carbon.
A solution is made witmlh 20.2ml of CH3OH ( density= 0.782g/ml), dissolved in 100.ml of water (density = 1.00 g/ml). Calculate the concentration in the units of:
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