Chemistry Homework Help: Answers & Questions Page 71

• What is benzene used for today?

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• Gasoline has a density of ##"0.73 g/cm"^3##. How many liters of gasoline would be required to increase the mass of an automobile from 1271 kg to 1303 kg?

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• Calculate the number of grams of copper(I) oxide reacted and the number of grams of copper and sulfur dioxide produced when 20 g of copper(I) sulfide is reacted?

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• Does the nitrate ion have one long ##N¬O## bond and two short ##N¬O## bonds?

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• What is the law of conservation of mass in mathematical terms?

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• What is surface tension?

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• If Sr 90 undergoes beta decay, then what is the resulting element and atomic weight of the product after the beta decay has occurred?

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• An acid-base titration is performed but some base that splashed onto the sides of the flask is not rinsed down prior to the endpoint measurement. Will the calculated molarity of the acid sample be erroneously high or low, and why?

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• What is the number of dots in the electron dot symbol of nitrogen?

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• What is the pH of the equivalence point solution in the titration of 25.00 mL of 0.100 M CH3COOH (pKa = 4.76) with 0.125 M NaOH solution?

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• Is hydrolysis exothermic or endothermic?

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• What is a cresol? and what are the different types of cresol?

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• Is the term "buffered aspirin" used correctly?

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• Why is amide protonated on oxygen rather then in nitrogen ??

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• Why do your ears ''pop'' as you drive up a mountain?

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• Novocaine, which is used by dentists as local anaesthetic, is a weak base with Kb = 8.91 x 10-6. Blood has a pH of 7.4. What is the ratio of concentrations of novocaine to its conjugate acid in the blood stream?

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• Why is the reactivity series of metals important?

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• What is the electron configuration for a phosphorous anion with a charge of ##-2##?

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• What is the definition of a covalent compound?

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• What is the formula for calcium sulfate?

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• How can atomic emission spectra be useful?

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• How does gas exerts pressure on its container?

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• How do specific heat capacity and thermal conductivity differ?

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• A perfect cube was found to have a mass of 16.2 g . If the density of aluminum is 2.7 g/cm what is the length of each side of aluminum?

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• What is the molecular geometry of BCl3? Draw its VSEPR and Lewis structure.

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• What is a mole and why are moles used?

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• In ocean water, is salt a solvent or a solute?

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• Write the correct chemical formula to distinguish between?..... calcium sulfide and calcium hydrogen sulfide

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• How do you calculate concentration of ions in a solution?

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• Given that Ka for HBrO is 2.8 × 10-9 at 25 °C, what is the value of Kb for BrO– at 25 °C? Given that Kb for (CH3)2NH is 5.4 × 10-4 at 25 °C, what is the value of Ka for (CH3)2NH2 at 25 °C?

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• How would you define density?

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• A substance Q conducts electricity both when solidand molten. What is Q?

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• What is a binary acid and how do you name them?

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• What is the molecular weight of H2SO4?

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• How much 2% glucose solution can be made from 50.0 mL of 35% glucose solution?

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• What is the conjugate acid of ClO4-?

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• What is delta G?

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• What vsepr shapes are polar?

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• Which one gives an acidic pH in aqueous solution ? 1- NaCl 2-NaHCO3 3-Ca3(PO4)2 4-Nh4Cl 5-CH3COOK

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• How do you calculate buffer pH for polyprotic acids?

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• I don't understand the concept of hydrates; A 2.78g sample of hydrated FeSO4 was heated to remove all the water of the hydration. The mass of the anhydrous FeSO4 was 1.52g. Calculate the number of water molecules associated with each unit of FeSO4?

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• What is the maximum number of pi bonds that can exist in a given pair of atoms?

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• What is the empirical formula for the compound P4O6?

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• Determine the pH of a .22-M ##NaF## solution at ##25^@"C"##? The ##K_a## of ##HF## is ##3.5xx10^(-5)##

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• Are the electrons in a coordinate covalent bond donated by both the bonded atoms?

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• What are the units for k in first, second, and third order reactions?

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• Why does ice float on water?

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• What is the structure of L(+) Glucose and L(-) Glucose? What does +, -, and L tell you?

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• What is the gram formula mass of ##KMnO_4##?

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• What are the conjugate bases of the acids HF and HClO ?

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