Chemistry Homework Help: Answers & Questions Page 50

• Why is PtCl4^2- square planar?

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• How do you convert 8 milliliters to fluid ounces?

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• What is the difference between atomic mass, atomic weight, and mass number?

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• What is the molecular shape of phosphorus trichloride (##PCl_3##)? What are the bond angles in this molecule?

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• How do you convert 190 mm Hg to atmospheres of pressure?

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• Why does NaH2PO4 become acidic in water? I thought this reaction would yield NaOH and HPO4- and NaOH is a strong base! Please explain what happens to the sodium ION. Does it accept a hydroxide?

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• The density of copper is ##8.96 "g/cm"^3"##. The density of zinc is ##7.14 "g/cm"^3"##. A sample of brass has 70% copper and 30% zinc by mass. What would be the density of this brass sample?

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• How would you balance Na2B4O7 + H2SO4 + H2O --> H3BO3 + Na2SO4?

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• How do you calculate percent composition of a mixture?

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• Why is surface tension important to life on earth?

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• Is BI3 a stronger Lewis acid than BCl3 and BF3?

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• What peaks in their mass spectra could be used to distinguish between 4-methyl-2-pentanone and 2-methyl-3-pentanone?

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• What shape is CH4O?

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• Methane (CH4) has a normal boiling point of -161.6 C. At this temperature, the delta H condensation= -8.17KJ/mol. If 16.5g of the liquid methane vaporize, how much energy is absorbed. ? Thank you

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• How can you calculate partial pressure?

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• A. How many grams of KOH are needed to neutralize 18.25 g of HCl? b. How many moles of each are involve in this reaction? Thanks

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• How many millimoles of HCl are contained in ##5.00 xx 10^1 "mL"## of 5.00% (by mass) aqueous HCl solution (density = ##"1.02 g/mL"## )? What volume of 5.00 M NaOH solution would be needed to neutralize ##5.00 xx 10^1 "mL"## of 5.00% HCl solution?

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• What characteristics define a chemical system in equilibrium?

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• Is CH3NH2 an acid or a base?

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• What is the molecular formula of potassium permanganate?

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• What are examples of colloids?

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• What is the molar mass for 2H2O?

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• What is system international unit of atomic radius ?

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• What is the formula of ammonium carbonate?

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• What is the molar mass of magnesium nitride, ##"Mg"_3"N"_2##, if the mass of one mole of magnesium is 24.31 g and of one mole of nitrogen is 14.01 g?

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• Butane , octane and hexane in order of increasing boiling point?

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• How can I calculate the empirical formula of butane?

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• Ksp=2.4x10-5 for calcium sulfate What is the molar solubility of calcium sulfate in pure water? What is the mass solubility of calcium sulfate in pure water, expressed in g/L

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• Sulfur forms two chlorides ##"S"_2"Cl"_2## and ##"SCl"_2##.The equivalent mass of sulfur in ##"SCl"_2## is ##"16 g"## .The equivalent weight of sulfur in ##"S"_2"Cl"_2## is ?

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• What is the oxidation state of phosphorus in PCl5?

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• Is this a Buffer? 25 ml of 0.60 M HClO4 + 45 ml 0.60 M KF. Please show how you determined its a buffer and mention the concentration of weak base and weak acid. PH= Pka + log(weak base/weak acid). (buffer equation)

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• What was Democritus's atomic theory?

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• How do you define atomic number?

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• What is the balanced equation for the neutralization of hydrobromic acid with calcium carbonate?

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• How would you find the molar enthalpy of vaporization for a substance, given 3.21 mol of the substance absorbs 28.4 kJ of energy as heat when the substance changes from a liquid to a gas?

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• How do you balance this equation H2SO4+NH4OH--->(NH4)2SO4+H2O?

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• What is metallic bonding, how does it work, and is it strong or weak and why?

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• What is the molar mass of glucose (C6H12O6)???

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• What element in the fourth period of the periodic table has 5 valence electrons?

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• How do you find volume when given mass?

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• Why are valence electrons important in chemical bonding?

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• What is the oxidation number of ##C_2O_4^(2-)##?

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• Are changes in state "physical" or "chemical" changes for molecular solids, and why?

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• Is the Avogadro constant used in the Avogadro's law formula?

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• What functional groups are there in caffeine?

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• N2O4(g) ⇌ 2 NO2(g). For the reaction, Kc = 0.513 at 500 K. If a reaction vessel initially contains an N2O4 concentration of 0.0500 M at 500 K, what are the equilibrium concentrations of N2O4 and NO2 at 500 K?

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• Is 2-methylpentane an alkane, alkene, or an alcohol?

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• Why is dissolving potassium nitrate in water an endothermic process?

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• If sodium peroxide is added to water, elemental oxygen gas is generated: Na2O2(s) + H2O(l) → NaOH(aq) + O2(g) Suppose 1.15 g of sodium peroxide is added to a large excess of water. What mass of oxygen gas will be produced in grams?

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• What is the molar mass of sodium hydroxide?

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