Chemistry Homework Help: Answers & Questions Page 66

• What is the percent by mass of water in barium bromide tetrahydrate ##BaBr_2 * 4H_2O##?

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• What is a particle that rapidly moves around the outside of the nucleus and carries a negative charge?

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• Show the bond dipoles in the molecules CF4 and CHF3?

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• How many resonance structures does N3- have?

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• C2H5OH (l) + 3O2(g)->2CO2 (g) + 3H2O (l) Delta H -1367kJ H2 (g) + 1/2 O2-> H2O (l) Delta H -286kJ C(graphite) + O2 (g) -> CO2 (g) Delta H -394 Calculate the change in enthalpy for this equation 2C (g) + 3H2 (g) + 1/2 O2-> C2H5OH (l) Delta H??

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• Dot structure of K3N?

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• How can metals be distinguished from non metals on the periodic table?

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• Write a balanced equation for the reaction of copper (II) hydroxide with aqueous ammonia to produce tetraamminecopper dihydroxide. Can you help plz?

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• What does it mean to say that the condition of chemical equilibrium is a dynamic situation?

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• How do you convert 1 mol/L HNO3 to % v/v HNO3?

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• What are the colors of light in the visible spectrum in order of increasing frequency?

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• The density of water is 1.00 g/mL at 4°C. How many water molecules are present in 2.46 mL of water at this temperature?

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• Name each of the following compounds?

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• According to the following reaction, how much energy is evolved during the reaction of 0.111 mol B2H6 and 0.252 mol Cl2 (Both gases are initially at STP)? The molar mass of B2H6 is 27.67 g/mol. B2H6(g) + 6 Cl2(g) → 2 BCl3(g) + 6 HCl(g) ΔH°rxn = -1396 kJ

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• What would distinguish the mass spectrum of 2,2-dimethylpropane from the mass spectra of pentane and 2-methylbutane?

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• Can you explain the formation of an ionic compound from zinc and chlorine?

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• What is the formula for potassium sulfide?

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• What is the balanced molecular equation for the neutralization reaction between HCl and Ba(OH)2 in aqueous solution? Include physical states.

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• What is the formula for magnesium nitride?

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• Zero is the freezing temperature of water on which temperature scale?

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• How does the octet rule relate to alkali metals?

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• What SI units are used to measure density?

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• How would you find the percent abundance of 2 isotopes of an element, given the atomic weight and mass number of each isotope?

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• How do you calculate molality from molarity?

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• Benzene is a hydrocarbon, a compound of carbon and hydrogen only. It is found to contain 7.74% H by mass. Its molar mass is 78.10 gmol^-1. Determine its empirical and molecular formula. Help?

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• If first order reaction x tend to y 40% of given sample of compound remain unreacted in 45min.Calculate rate constant of reaction?

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• How is Le Chatelier's Principle used in the Haber process?

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• How many NaOH is required to neutralize 1500##cm^3## of 0.1N HCl? a. 60g b. 6g c. 4g d. 40g

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• A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

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• What is the oxidation number for ethyne?

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• Can't we use hybridization concept for ionic compounds?with the help of hybridization we can predict shape of compound ,so if it is not applicable in ionic compounds how can we predict shape of ionic compounds?

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• What is the net ionic equation of the reaction of ##FeCl_2## with ##NaOH##?

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• A sample of 0.0512 mol of iron(III) chloride, FeCl3, was dissolved in water to give 25.0 mL of solution. What is the molarity of the solution?

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• How can I draw a perspective formula for ( S )-2-chlorobutane?

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• How do you convert 355 kJ to cal?

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• What is the net ionic equation that represents a neutralization reaction between H2SO4 and NaOH?

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• Is calcium oxide (CaO) an ionic compound or covalently bonded molecule?

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• How does a positive ion form?

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• What is the oxidation number for all elements of ClO2-?

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• The pH of 0.1 M HClO2 was measured to be 1.2, what is the value of pKa for chlorous acid?

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• How many grams of solute are present in 50 mL of 0.360 M sodium chloride?

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• In Bohr's model of the atom, where are the electrons and protons located?

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• How can I balance this equation? ___ AlBr3 + ____ K2SO4 ---> ____ KBr + ____ Al2(SO4)3

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• What is biochemistry?

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• What is the Arrhenius acid that contains the bromite anion?

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• What is the empirical formula of potassium chloride?

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• Why is ozone, ##O_3##, bent and not linear ?

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• How do you calculate osmolarity from molarity?

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• How many sp2 and sp3 hybridized carbons are in naproxen?

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• How would you balance the following equation: K2SO3(aq)+MnCl2(aq)→MnSO3(s)+KCl(aq)?

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