Chemistry Homework Help: Answers & Questions Page 59

• What's wrong with Bohr's model of the atom?

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• Explain the use of preparing standard solutions and titrations?

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• Why is KOH considered an Arrhenius base?

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• Why is the filter paper in the buchner funnel moistened?

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• What are the bases on which the potential of standard hydrogen elctrode is considered as zero? and i can't understand why it is difficult to measure the electric potential of each half cell without using the standard hydrogen electrode

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• The density lead is 11.3 g/mL. What is the mass of 45 mL of the of metal?

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• What are some examples of biological effects of radiation?

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• How many valence electrons does fluorine have?

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• Calculate the pH of a buffer when sodium hydrogen sulfate 0.1M and sodium sulfate has a concentration of 0.230M. (Give that Ka of hydrogen sulfate ion is 1.2*10^-2)?

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• Why is iron hard and sodium is soft, yet they are both metals?

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• How would you determine the formula and molar mass of aluminum sulfide?

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• How can I balance this chemical equation Pb(NO3)2 + K2CrO4 = PbCrO4 + KNO3?

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• Which type of hybridization is found in the compound PF5 ?

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• What is a radioactive isotope? Describe two scientific uses of radioactive isotopes.

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• How many sig figs for this question: now determine the grams per litre (g/L) concentration of acetic acid in the undiluted vinegar (assume the molar mass of acetic acid is 60.0 g/mol)? I don't want the answer I'm asking for how many sig figs ?

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• Why are dispersion forces weaker than dipole-dipole forces?

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• What is the formula for calcium hydroxide?

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• Why is HF a weak acid, and not a strong acid?

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• What are vitamins made of?

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• What is the pH of a saturated zinc hydroxide solution?

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• What is the effect of the temperature on the evaporation rate of ethyl alcohol?

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• Write the equation for the ionization of HC2H3O2?

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• What is Chromatography?

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• How do I use the algebraic method to balance the equation CaCO₃ + H₃PO₄ → Ca₃(PO₄)₂ + H₂CO₃?

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• What is the electron configuration for a nitride ion?

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• How would you balance Ag2O --> Ag + O2?

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• The formula for ethanol is CH3CH2OH what is the mole ratio of H to C?

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• Please explain how to determine what is oxidized and what is reduced in the following reaction: PbS + 4H2O2 --> PbSO4 + 4H2O

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• How can I balance this equation? ____ ##KClO_3 ->## ____ ##KCl +## ____ ##O_2##

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• The work function of an element is the energy required to remove an electron from the surface of the solid element. The work function for lithium is 279.7 kJ/mol. What is the maximum wavelength of light that can remove an electron from an atom ?

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• What are ketones?

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• Why is phenyl carbocation unstable?

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• What is the molar mass of aspirin, ##C_9H_8O_4##?

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• When sodium metal is dissolved in liquid ammonia a blue solution is formed which is highly conducting because electrons are solvated. Dissolving more sodium in solution results in a reduction in conductivity. Why is this?

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• What is the chemical formula of gold?

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• What is a Facile reaction?

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• What is the standard and easy definition of atomic mass?

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• The formula of sulfuric acid is what? (A) ##HCl## (B) ##HNO_3## (C) ##HClO## (D) ##H_2SO_4##?

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• How do you find percent composition from an empirical formula?

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• What are the values of the bond angles in SiCl4 ?

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• How to calculate standard enthalpy formation of Ca(OH)2 from the following data? 2 H2 (g) + 1/2O2--> 2H20 (l) Delta H1 = -571.66 kJ mol ^-1 CaO (s) + H2O (l) --> Ca(OH)2 (s) Delta H2= -65.17 kJ mol ^-1 2Ca(s) + O2 (g) --> 2 CaO (s) Delta H3= -127...

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• Solution A has a a hydronium ion concentration of 1.3 x 10^-3 M. Solution B has a hydroxide ion concentration of 4.5 x 10^-8M. Calculate the pH of solutions A and B Show all calculations?

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• How can you memorize oxidation number rules?

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• What is the electronegativity math for LiCl? Please and thank you

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• What is the formal charge on each atom in sulfuric acid?

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• How can I find the percent compositions of CuBr2?

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• What is difference a between a concentrated and a dilute solution ?

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• Zinc phosphide, ##Zn_3P_2##, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

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• What is the percent concentration of sodium chloride in normal saline?

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• How much heat, in joules and in calories, must be removed from 1.75 mol of water to lower its temperature from 25 degree celsius to 15 degree celsius?

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