Chemistry concepts and calculations

1.) If the temperature increases while keeping n and V unchanged, what must happ

1.) If the temperature increases while keeping n and V unchanged, what must happen to the pressure according to the Ideal Gas Law? 2.) If the volume increases while keeping n and …

1.) If the volume of the oceans is 1.35 x 10^18 m^3 and the abundance of deuteri

1.) If the volume of the oceans is 1.35 x 10^18 m^3 and the abundance of deuterium is 0.0156 atom%, how many kilograms of deuterium are present in the oceans?  (Neglect the presen…

1.) If your Aspirin sample did not dry completely and contained water in the sam

1.) If your Aspirin sample did not dry completely and contained water in the sample would it require more or less NaOH solution to reach the endpoint of the titration? 2.) The con…

1.) In Experiment 1: Melting point and IR, a student measured the spectra below

1.) In Experiment 1: Melting point and IR, a student measured the spectra below with their unknown sample. The melting point was 68-70 C. From your list of choices in Table 1.1 of…

1.) In a reaction between pure acetic acid and sodium bicarbonate, 9.59 grams of

1.) In a reaction between pure acetic acid and sodium bicarbonate, 9.59 grams of sodium bicarbonate was added to 18.0 mL of acetic acid. Which reactant is the limiting reactant in…

1.) In a reaction between pure acetic acid and sodium bicarbonate, 9.59 grams of

1.) In a reaction between pure acetic acid and sodium bicarbonate, 9.59 grams of sodium bicarbonate was added to 18.0 mL of acetic acid. Which reactant is the limiting reactant in…

1.) In black-and-white film developing (an ancient technology for most of you),

1.) In black-and-white film developing (an ancient technology for most of you), excess AgBr is removed from the film negative by an aqueous solution of sodium thiosulfate (Na2S2O3…

1.) In order to determine the value of the activation energy for a particular ch

1.) In order to determine the value of the activation energy for a particular chemical reaction, A. two experiments must be performed at the same temperature, but with different c…

1.) In the Mythbuster\'s burning thermite video 1000 lb of thermite were used. T

1.) In the Mythbuster's burning thermite video 1000 lb of thermite were used. That's 454 kg. A mole of thermite (1 Fe2O3 + 2 Al) weighs 213.7 g. The thermite reaction produces 280…

1.) Indicate which aqueous solution has the lowest vapor pressure: a. 0.2 M MgCl

1.) Indicate which aqueous solution has the lowest vapor pressure: a. 0.2 M MgCl2   b. 0.1 M MgCl2   c. 0.2 M NaCl d. 0.1 M KCl e. 0.1 M Na2CO3 2.) Indicate which aqueous solution…

1.) Infrared spectroscopy relies on what phenomenon? A.) electronic transitions

1.) Infrared spectroscopy relies on what phenomenon? A.) electronic transitions B.) molecular rotations C.) nuclear alignments D.) molecular stretching and bending E.) conformatio…

1.) Is a penny pure copper? No, not if it was minted after 1982. What else is in

1.) Is a penny pure copper? No, not if it was minted after 1982. What else is in that thing? Why? 2.) Exactly how much copper is in one penny? You probably don't know the answer t…

1.) Iso-octane has the condensed formula CeHre a.) Write the com plete balanced

1.) Iso-octane has the condensed formula CeHre a.) Write the com plete balanced reaction for combustion of iso-octane where the water produced is in liquid form. b.) Iso-octane ha…

1.) ItIt is desired to make 1.00 L of 1.34 M NaNO2 from a more concentrated 5.48

1.)  ItIt  is desired to make 1.00 L of 1.34 M NaNO2 from a more concentrated 5.48 M NaNO2. a.     How many moles of NaNO2 will be contained in the 1 liteer, 1.34 solution after i…

1.) Nitric oxide, NO reacts with H 2 to give N 2 O and H 2 O according to 2NO(g)

1.) Nitric oxide, NO reacts with H2 to give N2O and H2O according to 2NO(g) + H2(g) N2O + H2O(g) In a series of experiments, the following initial rates of disappearance of NO wer…

1.) Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide

1.) Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation:        3NO2(g)+H2O(l)?2HNO3(l)+NO(g) Suppose that 3.7mol NO2 and 1.2mol…

1.) One of the main ingredients in most household and industrial cleaners is a l

1.) One of the main ingredients in most household and industrial cleaners is a liquid known as butyl cellosolve, C6H14O2. How many grams of C6H14O2 are needed to produce 125.5 gra…

1.) Order the intermolecular forces (dipole-dipole, London dispersion, ionic, an

1.) Order the intermolecular forces (dipole-dipole, London dispersion, ionic, and hydrogen-bonding) from weakest to strongest. 2.) Which of the species below would you expect to s…

1.) PLEASE ANSWER ALL THE FOLLOWING A.) Complete the row for KNO3. Enter your an

1.) PLEASE ANSWER ALL THE FOLLOWING A.) Complete the row for KNO3.Enter your answers numerically separated by a comma. B.) Complete the row for NaHCO3.Enter your answers numerical…

1.) Please match each statement to the best available keyword or phrase provided

1.) Please match each statement to the best available keyword or phrase provided. Note that there are more keywords and phrases then needed for the sentences available. [ ] NOx an…

1.) Please only answer if your 100% correct, This is the third time ive posted t

1.) Please only answer if your 100% correct, This is the third time ive posted this question and everyone keeps getting this question and its parts wrong. So i wrote underneath ea…

1.) Predict if one or more precipitates will form when aqueous solutions of pota

1.) Predict if one or more precipitates will form when aqueous solutions of potassium nitrate (KNO3) and sodium hydroxide (NaOH) are mixed. 2.) Predict if one or more precipitates…

1.) Pure air” best described as A.) A mixture because it contains CO 2 which is

1.) Pure air” best described as A.) A mixture because it contains CO2 which is composed of two different elements. B.) A pure substance C.) A mixture because it contains N2, CO2, …

1.) Show the types of solvation interactions that might be expected when ammoniu

1.) Show the types of solvation interactions that might be expected when ammonium chloride is dissolved in ethanol. Consider solvation of both the cation and the anion. 2.) What s…

1.) Silver Chromate may be prepared by the following reaction. 2 AgNO 3 (aq) + K

1.)    Silver Chromate may be prepared by the following reaction. 2 AgNO3(aq) + K2CrO4(aq) ----> Ag2CrO4(s) + 2 KNO3(aq) Calculate the mass of silver chromate produced when 0.6…

1.) Sodium-24 has a half-life of 15 hours. How much of a 40 mg sample would rema

1.) Sodium-24 has a half-life of 15 hours. How much of a 40 mg sample would remain after four half-lives? 2.) Which physical state has the lowest entropy? a.) Solids b.) liquids c…

1.) Suppose you have 2 moles of NaCl. You dissolve it in 500 mL of water. What i

1.) Suppose you have 2 moles of NaCl. You dissolve it in 500 mL of water. What is the molarity of this solution? 2.) From the solution you just made in Question 1, you transfer 2 …

1.) Suppose you want to make 1000 kg of NH3 per hour. How many moles per hour of

1.) Suppose you want to make 1000 kg of NH3 per hour. How many moles per hour of N2 and H2 will be needed? N2 + 3H2 ----> 2NH3 2.) The pure N2(g) needed for the ammonia synthes…

1.) The amount of energy in electromagnetic radiation is related to the frequenc

1.) The amount of energy in electromagnetic radiation is related to the frequency and wavelength of the radiation. Low energy radiations like radio waves have a _____(Long or Shor…

1.) The average atomic mass of naturallyoccuring neon is 20.18 amu. There are 2

   1.) The average atomic mass of naturallyoccuring neon is 20.18 amu. There are 2 common isotopes ofnaturally occuring neon as indicated below.    Isotope:        Ne-20      Ne-2…

1.) The average molecular speed in a sample of CO2 gas at a certain temperature

1.) The average molecular speed in a sample of CO2 gas at a certain temperature is 416 m/s. The average molecular speed in a sample of O2 gas is________ m/s at the same temperatur…

1.) The combustion of a mol of an unidentified carbohydrate yields 6 mol CO2 and

1.) The combustion of a mol of an unidentified carbohydrate yields 6 mol CO2 and 6 mol H2O. a. How many moles of CO2 can be produced from 60 g of the carbohydrate used in Question…

1.) The combustion of a mol of an unidentified carbohydrate yields 6 mol CO2 and

1.) The combustion of a mol of an unidentified carbohydrate yields 6 mol CO2 and 6 mol H2O. a. How many moles of CO2 can be produced from 60 g of the carbohydrate used in Question…

1.) The combustion of propane (C3H8) produces carbon dioxide and steam: C3H8(g)+

1.) The combustion of propane (C3H8) produces carbon dioxide and steam: C3H8(g)+5O2(g)===>3CO2(g)+4H2O(l) How many moles of CO2 are produced when 9.0 mol of propane are burned …

1.) The common laboratory solvent diethyl ether (ether) is often used to purify

1.) The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of diethyl ether, CH3CH2OCH2CH3, is 463.57 mm Hg at …

1.) The conversion of pyruvate to lactate by lactate dehydrogenase (LDH) is acco

1.) The conversion of pyruvate to lactate by lactate dehydrogenase (LDH) is accompanied by the consumption of (chose one) a. ATP b. ADP c. NAD+ d. NADH 2.)Which is the best explan…

1.) The density of air at STP is 1.29g/L. If your stoppered \"250mL\" flask cont

1.) The density of air at STP is 1.29g/L. If your stoppered "250mL" flask contains 242 ml of water ( also the volume of air it would contain), calculate the mass of air in the fla…

1.) The equilibrium constant for the chemical equation N 2(g) +3H 2(g) 2NH

1.) The equilibrium constant for the chemical equation N2(g)+3H2(g) <--> 2NH3(g) is Kp = 1.09 at 209 °C. Calculate the value of the Kc for the reaction at 209 °C. 2.) At a c…

1.) The figure schematically represents a living cell. The minimum work required

1.) The figure schematically represents a living cell. The minimum work required to transfer one mole of K+ cation from the cell interior solution to the exterior solution through…

1.) The first reaction in glycolysis is the phosphorylation of glucose Pi+glucos

1.) The first reaction in glycolysis is the phosphorylation of glucose Pi+glucose <>glucose-6-phosphate delta G knot prime=+14 kj/mol A.) In a liver cell at 37 degrees C the…

1.) The following reaction was carried out in a 2.50L reaction vessel at 1100 K:

1.) The following reaction was carried out in a 2.50L reaction vessel at 1100 K: C(s)+H2O(g)?CO(g)+H2(g) If during the course of the reaction, the vessel is found to contain 5.50m…

1.) The following reaction was carried out in a 2.50L reaction vessel at 1100 K:

1.) The following reaction was carried out in a 2.50L reaction vessel at 1100 K: C(s)+H2O(g)?CO(g)+H2(g) If during the course of the reaction, the vessel is found to contain 5.50m…

1.) The heat of fusion, ?Hfus, of ethanol (C2H5OH) is 4.9 kJ/mol. The heat of su

1.) The heat of fusion, ?Hfus, of ethanol (C2H5OH) is 4.9 kJ/mol. The heat of sublimation of ethanol, for the process C2H5OH(s) ? C2H5OH(g) , is 43.5 kJ/mol. What is the heat of v…

1.) The heat of fusion, ?Hfus, of ethanol (C2H5OH) is 4.9 kJ/mol. The heat of su

1.) The heat of fusion, ?Hfus, of ethanol (C2H5OH) is 4.9 kJ/mol. The heat of sublimation of ethanol, for the process C2H5OH(s) ? C2H5OH(g) , is 43.5 kJ/mol. What is the heat of v…

1.) The mass of 1.21 × 10 20 atoms of phosphorous is 3.88 × 10 21 g. 2.00 mg. 30

1.) The mass of 1.21 × 1020 atoms of phosphorous is 3.88 × 1021 g. 2.00 mg. 30.97 g. 6.22 mg. 2.01 × 10-4 g. 2.) Samples of the following volatile liquids are opened simultaneousl…

1.) The organic solvent phenol, C6H5OH dissociates to a small extent in water ac

1.) The organic solvent phenol, C6H5OH dissociates to a small extent in water according to the following equilibrium equation: C6H5OH(aq) C6H5O - (aq) + H + (aq) Use Le Chatelier’…

1.) The synthesis of alum crystals takes place according to four different chemi

1.) The synthesis of alum crystals takes place according to four different chemical reaction steps, the first and fourth of which are detailed in the Introduction. Identify the ba…

1.) The valve between a 10 L tank containing a gas at 7 atm and a 15 L tank cont

1.) The valve between a 10 L tank containing a gas at 7 atm and a 15 L tank containing a gas at 10 atm is opened. What is the final pressure in the tanks? 2.) Derive an expression…

1.) To convince yourself that entropy of a bath changes even though its temperat

1.) To convince yourself that entropy of a bath changes even though its temperature remains unchanged, consider the following case: A tub that contains water at 40C receives 100 k…

1.) Understanding the contractile response of an animal skeletal system is impor

1.) Understanding the contractile response of an animal skeletal system is important in bio-mechanical studies. Towards this end, the studies have measured velocity-force data and…