Questions asked by Nabil A.

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• A volume of saline solution weighed 25.6 g at 4 degrees C. An equal volume of water at the same temperature weighed 24.5 g. what is the density of the saline solution?
  
• Each 5-mL portion of Maalox contains 400 mg of magnesium hydroxide, and 40 mg of simethicone. If the recommended dose is 2 teaspoons 4 times a day, how many grams of each substance would an individual take in a 24-hour period? (1 teaspoon= 5 mL)
  
• If the proper dosage of a drug is 2 mg/kg of body weight, how many milligrams would a 110-lb individual need?
  
• The average nicotine (C10H14N2, molar mass 162.3 g/mol) content of a Camel cigarette is 1.93 mg. Suppose an individual smokes one pack of 20 cigarettes a day. How many moles of nicotine are smoked in a day?
  
• What is the molarity of an H2SO4 solution if 18.5 mL of 0.18 M NaOH are needed to neutralize 25.0 mL of the sample? H2SO4 + 2NaOH => Na2SO4 + 2H2O
  
• IUPAC Name for (ch3ch2)2chch(ch2ch3)2 and can you draw the structure corresponding to it?
  
• What are the structural isomers of cyclic C5H8CL2?
  
• How will we draw the following? and what functional group does it have? 2-pentoxynonane
  
• What is the main component of the cell membrane? Why is it the main component?
  
• How do you calculate the complementary strand of a DNA strand? How do you calculate the number of different trinucleotides that can be made from one guanine, one uracil and one adenine?
  
• What is the kinetic energy in kilojoules of a 2360 lb (1070 kg) car moving at 63.3 mi/h (28.3 m/s)?
  
• A Big Mac hamburger from McDonald’s contains 540 Calories. (a) How many kilojoules does a Big Mac contain? (b) For how many hours could the amount of energy in a Big Mac light a 100 watt light- bulb? (1 watt = 1 J/s)
  
• 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?
  
• How to factor cubic trinomials? x^3-7x-6
  
• In the U.S., the emissions limit for carbon monoxide in motorcycle engine exhaust is 12.0 g CO per km driven. What is this limit expressed in milligrams per mile (mg/mi)?
  
• A 1.0 oz piece of chocolate contains 15mg of caffeine, and a 6.0 oz cup of regular coffee contains 105mg of caffeine. How much chocolate in g, Ib, amu, and metric ton would you have to consume to get as much caffeine as you would from 2.0 cups of coffee?
  
• There are two compounds of titanium and chlorine. One compound contains 31.04% titanium by mass, and the other contains 74.76% chlorine by mass. What are the ratios of titanium and chlorine atoms in the two compounds?
  
• Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation? 2 S(s) + 3 O2(g) + 4 NaOH(aq) → 2 Na2SO4(aq) + 2 H2O(l)
  
• If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to produce 42.0 g of O2? 2 KClO3(s) → 2 KCl(s) + 3 O2(g)
  
• How many grams of glucose would you need to make 500ml of a 16% solution?
  
• Combustion analysis of a 31.472 mg sample of the widely used flame retardant Decabrom gave 1.444 mg of #CO_2#. Is the molecular formula of Decabrom #C_12Br_10O# or #C_12H_10O#?
  
• Which of the following species can be Bronsted-Lowry bases? a- -OH b- Ca2+ c- C2H6 d- PO43- e- -OCl f- MgCO3
  
• What is the oxidation state of the elements in the following compounds? Cu(NO3)2 ; KNO3
  
• Calculate in kilojoules per mole the energy necessary to completely remove an electron from the first shell of a hydrogen atom (Rq = 1.097 * 10-2 nm-1).?