Chemistry Homework Help: Answers & Questions Page 93

• What is activation energy? What is threshold energy? What are the differences between them?

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• Did Rutherford's gold foil experiment change the view of the atom?

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• Why is boron trifluoride a trigonar planar and phosphorus triflouride a trigonar pyramidal?

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• Is the molar mass of oxygen 16 or 32?

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• How do you calculate the percent yield of triphenylmethanol?

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• What is the atomic model timeline?

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• What is the electron configuration for the element Pb?

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• What are the steps in the scientific method?

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• How to balance the equation H2So4 + Fe = Fe2(So4)3 + H2?

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• A sample of calcium nitrate, ##Ca(NO_3)_2##, with a formula weight of 164 g/mol, has ##5.00 x 10^25## atoms of oxygen. How many kilograms of ##Ca(NO_3)_2## are present?

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• Why is ammonia not an arrhenius base?

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• From the Heisenberg uncertainty principle how do you calculate Δx for each of the following: (a) an electron with Δv = 0.340 m/s (b) a baseball (mass = 145 g) with Δv = 0.200 m/s?

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• What is the electron configuration for bromine?

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• How many electron shells does the element nitrogen have?

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• Is the SI unit of volume derived from the unit of length?

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• How can I use scientific notation on casio calculator?

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• How would you classify each of the following as element, compound, or mixture?

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• 2.4g/mL to mg/L?

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• Why are metallic compounds insoluble in water?

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• How does pH affect Gibbs free energy?

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• Explain Back Bonding in B2H6. Is it a 3 center bond?

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• What is the nuclear equation for uranium-238 after alpha radiation is emitted?

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• The volume of a sphere is given by V = (4/3)πrr3 , where r is the radius. Compute the volume of a sphere with a radius of 199 pm. State your answer in units of m3?

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• Please describe each mixture separation technique?

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• What is the difference between tautomerism and metamerism?

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• What is the decay equation for the beta decay of uranium 237?

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• How can molarity be used as a conversion factor?

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• Calculate the mass ratio of zinc to iodine in zinc iodide .( mass of zinc consumed is 1.05g and mass of iodine consumed is 1.98g)Mass of ZnI2 after reaction is 2.45g ?????

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• What is a formula unit?

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• What is the empirical formula of calcium sulfate?

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• What does a negative heat capacity mean?

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• The density of liquid mercury is 13.6g/ml. What is it's density in units of lb/in³ ?

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• How many bonding orbitals are in Silicon Tetraflouride, or ##SiF_4##?

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• How do you name alkanes from Newman projections?

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• How do you find pH if given osmotic pressure and temperature?

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• How do polyatomic ions bond?

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• Can you explain the deviation of real gases using Van der Waals equation?

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• Is this equation right HCl + NaOH ---> H2O + NaCl or NaOH+HCl--> NaCl + H2O & what the difference ?

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• What is a physical change?

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• Write an equilibrium expression for each chemical equation involving one or more solid or liquid reac- tants or products. CO2−3(aq)+H2O(l)⇌HCO−3(aq)+OH−(aq) Use A for [CO2−3], B for [H2O], C for [HCO−3], D for [OH−] Can someone help?

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• What is the oxidation number of phosphorus in KH2PO4?

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• Does anyone know what an excited state configuration is? Pls Help!

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• What is electron affinity's definition?

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• The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for a mass of 62.93 amu and 30.8% for a mass of 64.93 amu. What is the average atomic mass of copper?

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• What are the three main types of intermolecular forces?

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• Write balanced equation for proton-transfer reaction between HCl and PO43−?

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• Why is sulfuric acid considered a Bronsted acid?

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• Calculate the molar mass of carbon tetrafluoride ?

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• The density of ethanol, a colorless liquid that is commonly known as grain alcohol, is 0.798 g/mL. How would you calculate the mass of 17.4 mL of the liquid?

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• How do resonance structures affect bond length?

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