Chemistry Homework Help: Answers & Questions Page 60

• According to Avogadro's law, why dies the ideal gas constant has the same value for all gases?

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• Why is knowing the number of valence electrons important in chemical bonding?

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• What happens during a chemical reaction?

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• Which is stronger: a polar covalent bond or a nonpolar covalent bond?

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• Calculate the mass of calcium carbonate that is required to dissolve in 100cm cubed of water in order to produce a solution of concentration of 0.5mol/dm cubed?

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• What is the charge on the iron cations in iron(II) chloride and iron (III) chloride, respectively?

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• Write the formula for iron (III) sulfate. What would this be?

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• Why is ##FeBr_3## a lewis acid?

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• What are optical isomers? Give me an example

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• The density of silver is 10.5 ##"g/cm"^3##, what mass of silver would occupy a volume of 24.0 ##"cm"^3##?

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• Is H2O2 -- H2O+O2 a balanced equation?

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• Which is predicted to have the shorter sulfur–oxygen bonds: a sulfite ion or a sulfate ion?

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• What are the pKas of ##HCN##, hydrocyanic acid and ##HF##, hydrofluoric acid?

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• The Henry's law constant for the solubility of ##N_2## gas in water at 298K is ##1*10^(-5)## atm. The mole fraction of ##N_2## in air is 0.8. The number of moles of ##N_2## from air dissolved in 10 moles of water at 298K and 5 atm pressure is ____ . Answer?

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• Is the molecule ##SF_4## polar or non polar?

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• Draw and energy-level diagram that shows all energy levels from n=5 to n=1. Draw all possible emissions lines between these levels?

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• Calculate the ##pH## of ##10^-8## ##M## ##HCl##?

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• What is the conjugate acid of HPO42− ?

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• Counter-current mechanism of kidney

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• What is the molar mass of ammonia (NH3)?

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• How can I identify ion-dipole forces?

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• How does atmospheric pressure affect boiling point?

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• Why are metallic compounds malleable?

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• How can I write the formula for magnesium sulfide?

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• An oxygen atom has a total of 8 elections. How do you write the 4 quantum numbers for each of the 8 electrons in the ground state ?

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• Calculate the pH at the equivalence point for the titration of 0.20 M ##"HCl"## with 0.20 M ##"NH"_3##? ##K_b = 1.8 xx 10^(–5)##

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• What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

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• In the equation: Pb(no3)2(aq) + 2ki(aq) → pbi2(s) + 2kno3(aq), which compound would not form ions in the complete ionic equation?

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• What temperature scale is used in Canada?

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• Find the amount in Grams of Fe2O3 required to make 1000 Kilograms of Fe. 2Fe2O3 + 3C ------> 4Fe + 3Co2?

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• Which one of the following ions has zero CFSE (crystal field stabilisation energy) in octahedral field ? Options 1. Fe3+ (low spin) 2. Fe3+ (high spin) 3. Co2+ (low spin) 4. Cr+3 (high spin)

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• What type of chemical changes can be reversed?

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• A 1.0 ounce piece of chocolate contains 15 mg of caffeine, and a 6.0 ounce cup of regular coffee contains 105 mg of caffeine. How much chocolate would you have to consume to get as much caffeine as you would from 2.0 cups of coffee?

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• Why is radioactive half-life important?

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• Why are metals malleable?

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• What is the oxidation state of chromium in the dichromate ion, ##"Cr"_2"O"_7^(2-)##?

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• What is the mass of 3 molecules of ##"NaOH"## in a.m.u ?

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• What is rate constant and what is specific rate constant?

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• A student is given a sample of a green nickel sulfate hydrate. She weighs the sample in a dry covered crucible and obtains a mass of 22.326 g for the crucible, cover, and sample. earlier she had found that the crucible and cover weighed 21.244 g?

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• What is the limiting reagent in grignard reaction?

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• You have three covalent compounds with three very different boiling points. All of the compounds have similar molar mass and relative shape. Explain how these three compounds could have very different boiling points ?

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• What are the quantum numbers of the electrons that are lost by an atom of iron when it forms the ion ##"Fe"^(2+)## ?

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• How does electronegativity affect ionic bonding?

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• How does concentration affect SN2 reactions?

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• What is the Lewis dot symbol for lead?

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• What is an indicator that a chemical reaction has taken place?

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• What are conjugated and unconjugated carbonyl groups?

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• What is the De Broglie equation?

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• What is the role of buffer solution in complexometric titrations?

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• What is the VSEPR shape of the molecule ##PF_3##?

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