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Which of the following is true about ionic bonds? Select one: a. They are common when a metal atom bonds to other metal atoms. b. They are basically a van der Waals attraction. c. They are unidirectional in nature. d. They occur when fermions interact with bosons. e. The metal atom typically loses one or more electrons to become a positively charged ion. Question 2 Complete Properties typical of substances which exhibit ionic bonding include: Select one: a. They have low melting points. b. The liquid form conducts electricity well. c. They are malleable. d. They are nontoxic. e. They have rather low boiling points. Question 3 ________________________ is held together with ionic bonds. Select one: a. Table salt b. Table sugar c. Steel d. Polyethylene e. Gasoline Question 4 Which of the following is NOT true about covalent bonds? Select one: a. They are common when a nonmetal atom bonds to a metal atom. b. They are not an electrostatic attraction. c. They have specific direction to them. d. They have specific shapes to them. e. All of the above are true. Question 5 The atoms in molecules of __________________________ are held together with covalent bonds. Select one: a. polyethylene b. salt c. iron d. calcium sulphate e. helium Question 6 The band gap model for metallic bonds involves the orbitals of many, closely packed metal atoms interacting to create numerous, closely spaced orbitals. This feature of the band gap model explains Select one: a. the malleability of metals. b. the ductility of metals. c. the shininess of metals. d. the conduction of heat by metals e. dislocations in the crystal lattice of meta
If a 2.1 L reaction vessel initially contains 723 torr of cyclopropane at 485 degrees C , how long will it take for the partial pressure of cylclopropane to drop to below 105 torr ?
A mysterious material was purified from safflower oil (hint: full of fatty acids). Upon ozonolysis it gave the following compounds in their respective molar ratios.
Find the change in entropy (S) for the system, surroundings and universe for the conversion of 1 mol of ice at 0 degrees C and 1.00 atm to 1.0 mol of steam (vapor) at 100 degrees C and 0.50 bar. Useful data might be
An aqueous solution is 13.0% by mass ethanol, CH3CH2OH, and has a density of 0.978 g/mL. The molality of ethanol in the solution is?
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 7.00 nm in diameter? Take the m..
start with 4-cyclopentylphenol and react with NaOH, CH3I, NBS, heat show each step to get the final product.
A 3.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure. What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?
When 1.00 g of urea (CO(NH2)2) is dissolved in 200g of solvent A, the freezing point is lowered by 0.250C. When 1.50 g of the nonelectrolyte Y is dissolved in 125 g of the same solvent
What is the freezing point of a solution that contains 23.0g of urea, CO(NH2)2, in 275mL water, H2O. Assume a density of water of 1.00 g/mL
A 25 ml sample of .30M sodium acetate is titrated with .3M HCl. What is the pH after addition of 12.5 ml of HCl. (Ka= 1.8e-5)
43 kg person drinks 410. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work.
A chemistry student needs 80.0mL of acetone for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of acetone is 0.790g cm^-3.
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