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Khaled Maan

Khaled M.

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Indicate the number of significant figures in each of the following: a. This book contains more than 1000 pages. b. A mile is about 5300 ft. c. A liter is equivalent to 1.059 qt. d. The population of the United States is approaching $3.1 \times 10^{2}$ million. e. A kilogram is 1000 g. f. The Boeing 747 cruises at around 600 mi/h.

Indicate the number of significant figures in each of the following: a. This book contains more than 1000 pages. b. A mile is about 5300 ft. c. A liter is equivalent to 1.059 qt. d. The population of the United States is approaching $3.1 \times 10^{2}$ million. e. A kilogram is 1000 g. f. The Boeing 747 cruises at around 600 mi/h.

Chemistry

Use exponential notation to express the number 385,500 to a. one significant figure. b. two significant figures. c. three significant figures. d. five significant figures.

Use exponential notation to express the number 385,500 to a. one significant figure. b. two significant figures. c. three significant figures. d. five significant figures.

Chemistry

Questions asked

INSTANT ANSWER

Draw the first Brillion zone a) b) - - Brillouin zone Draw [110] vector, show the (001) plane CRYSTAL LATTICE simple cuble \[ a=b=c \] \[ \alpha=\beta=\gamma=90^{\circ} \]

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ANSWERED

Aparna Shakti verified

Numerade educator

Q26. What is the type of intermolecular forces between the N2 molecules: a) hydrogen bonding b) the London dispersion force c) dipole-dipole interaction d) covalent bonding e) All of them

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ANSWERED

David Collins verified

Numerade educator

Q25. Which of the following substances will have the lowest boiling point? a) Ne (MM = 20.0 g/mol) b) H2O (MM = 18.0 g/mol) c) NH3 (MM = 17.0 g/mol) d) He (MM = 4.0 g/mol) e) CH3OH (MM = 32.0 g/mol)

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ANSWERED

Ronald Prasad verified

Numerade educator

Q21. A large equilibrium constant a) indicates that a reaction has a small rate constant. b) indicates that the reaction favors the formation of reactants. c) indicates that a reaction has a large rate constant. d) indicates that the reaction favors the formation of products. e) results from the addition of a catalyst to a reaction mixture.

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ANSWERED

Rashmi Sinha verified

Numerade educator

Q20. Which statement concerning the autoionization (self-ionization) of water is FALSE? 2H2O(l) <=> H3O+ + OH-(aq) a) This reaction is an acid-base reaction according to the Bronsted-Lowry theory. b) Water is amphiprotic. c) A H2O molecule may react as an acid by donating a proton. d) In this reaction H3O+ and OH- are a conjugate acid- base pair. e) A H2O molecule may react as a base by accepting a proton.

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ANSWERED

David Collins verified

Numerade educator

Q17. Which salt dissolved in water will give the highest pH? a) NaCl b) KBr c) NaNO3 d) NH4Cl e) NaF Q18. The conjugate base of ammonia is: a) NH3 b) NH4+ c) NH2- d) OH- e) none of these Q19. Which of the following is a triprotic acid? a) H2SO3 b) H2S c) H2Te d) H3As e) [Sn(OH)3]+

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ANSWERED

Ronald Prasad verified

Numerade educator

Q14. Identify the INCORRECT statement below: a) In spontaneous changes the universe tends toward a state of greater disorder. b) The Gibbs free energy of a system is increasing in any spontaneous process going on at constant T and P. c) The entropy of a pure, perfect crystal at T = 0 K is zero. d) The entropy of a system decreases in a spontaneous process, if the surrounding entropy is increasing even more. e) The expansion of a gas into a vacuum is an example of an increase in entropy. Q15. The reaction that occurs when NH4Br dissolves in water is __________. a) NH4+ + OH- ? NH4OH b) Br- + H3O+ ? HBr + H2O c) NH3 + H2O ? NH4+ + OH- d) NH4+ + H2O ? NH3 + H3O+ e) Br- + H2O ? HBr + OH-

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ANSWERED

Rachel Levin verified

Numerade educator

Q12. There are two properties of a reacting system that determine whether a process at constant pressure an temperature can occur spontaneously. These are: a) kinetic and potential energy change b) heat and work c) energy change and enthalpy change d) enthalpy change and entropy change e) None of the above Q13. Calculate the pH of 0.10 M solution of aqueous ammonia. Kb = 1.8 x 10^-5. a) 9.36 b) 10.89 c) 11.11 d) 12.00 e) 2.89

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ANSWERED

Luke Humphrey verified

Numerade educator

Q9. The Ksp of Bi2S3 is 1.6 x 10^-72. What is the molar solubility of this compound in aqueous solution? a) 1.6 x 10^-72 M b) 4.4 x 10^-15 M c) 1.7 x 10^-15 M d) 1.2 x 10^-24 M e) 7.5 x 10^-7 M Q10. The molar solubility of calcium fluoride in water is 2.1 x 10^-4 moles/L. What is the Ksp of CaF2? a) 3.7 x 10^-11 b) 2.14 x 10^-4 c) 4.6 x 10^-8 d) 9.8 x 10^-12 e) 7.3 x 10^-6 Q11. Which of the following 0.10 M solution of salts is the MOST basic? Given the following data: Ka(HF) = 7.2x10^-4; Ka(HNO2) = 4.5x10^-4; Ka(HC2H3O2) = 1.8x10^-5; Ka(HOCl) = 3.5x10^-8; Ka(HCN) = 4.0x10^-10 and Kb(NH3) = 1.8x10^-5 a) NH4F b) NH4NO2 c) NH4CH3COO d) NH4OCl e) NH4CN

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ANSWERED

David Collins verified

Numerade educator

Q8. When a weak acid is titrated with a strong base the following pH curve is obtained, beside. What is the approximate pKa of the weak acid? a) 1 b) 3 c) 6 d) 7 e) 14

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