Chemistry concepts and calculations

1) What is the pH value of 50ml of 0.01M of H2CO3? Ka1= 4.3*10^-7, Ka2= 5.6*10^-

1) What is the pH value of 50ml of 0.01M of H2CO3? Ka1= 4.3*10^-7, Ka2= 5.6*10^-11 2) what is the pH if 10ml of 0.01M of NaOH is added into the solution in (1)? 3) what is the pH …

1) What is the pH-value of a buffer formed from 5.00 mL of 0.500 M acetic acid a

1) What is the pH-value of a buffer formed from 5.00 mL of 0.500 M acetic acid and 10.00 mL of 0.100 M NaOH solution? 2) A student needs 0.500 L of a 0.250 M sulfuric acid solutio…

1) What is the pH-value of a buffer formed from 5.00 mL of 0.500 M acetic acid a

1) What is the pH-value of a buffer formed from 5.00 mL of 0.500 M acetic acid and 10.00 mL of 0.100 M NaOH solution? 2) A student needs 0.500 L of a 0.250 M sulfuric acid solutio…

1) What is the percent yield of the solid product when 10.68 g of iron(III) nitr

1) What is the percent yield of the solid product when 10.68 g of iron(III) nitrate reacts in solution with excess sodium phosphate and 4.603 g of the precipitate is experimentall…

1) What is the percentage of alcohol in the following prescription? Rx Chlorofor

1) What is the percentage of alcohol in the following prescription? Rx Chloroform Spirit 110.0 mL (88% alcohol) Aromatic Elixir 85.0 mL (22% alcohol) Terpin Hydrate Elixir 255.0 m…

1) What is the physical definition of Energy? 2) What is rest mass energy? 3) Wh

1) What is the physical definition of Energy? 2) What is rest mass energy? 3) What are some examples of using chemical energy? 4) What is Kinetic Energy? 5) What is Electrical Ene…

1) What is the pressure in atmospheres inside a container of gas connected to a

1)What is the pressure in atmospheres inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 23.6 mm Hg…

1) What is the purpose of the concentrated sulfuric acid in Pinacol rearrangemen

1) What is the purpose of the concentrated sulfuric acid in Pinacol rearrangement? (Pinacol to Pinacolone) 2) Discuss how infrared spectroscopy (IR) can be used to distinguish bet…

1) What is the purpose of the concentrated sulfuric acid in Pinacol rearrangemen

1) What is the purpose of the concentrated sulfuric acid in Pinacol rearrangement? (Pinacol to Pinacolone) 2) Discuss how infrared spectroscopy (IR) can be used to distinguish bet…

1) What is the purpose of the new operator? 2) Define the terms arguments and pa

1) What is the purpose of the new operator? 2) Define the terms arguments and parameters. How are they different? 3) Write a method called Greeting that displays a personalized gr…

1) What is the purpose of the new operator? 2) Define the terms arguments and pa

1) What is the purpose of the new operator? 2) Define the terms arguments and parameters. How are they different? 3) Write a method called Greeting that displays a personalized gr…

1) What is the reason for extracting the organic (ether) layer with 10 ml of wat

1) What is the reason for extracting the organic (ether) layer with 10 ml of water? 2) a.if during the extraction you observed a cloudy or milky solution what can you do to preven…

1) What is the reason for extracting the organic layer with 10 ml of water? 2) i

1) What is the reason for extracting the organic layer with 10 ml of water? 2) if during the extraction you observed a cloudy or milky solution what can you do to prevent this fro…

1) What is the reason for norethynodrel\'s ability to function as a contraceptiv

1) What is the reason for norethynodrel's ability to function as a contraceptive? A) Norethynodrel is capable of mimicking progesterone establishing a false pregnancy.    B) Noret…

1) What is the specific heat of the solid phase? Express your answer to two sign

1)What is the specific heat of the solid phase? Express your answer to two significant figures and include the appropriate units. 2)What is the specific heat of the liquid phase? …

1) What is the standard state of A in a mixture of 5% A and 95% B (A and B are b

1) What is the standard state of A in a mixture of 5% A and 95% B (A and B are both volatile liquids)? A)A hypothetical state with activity equal to 1 but no interactions B) Pure …

1) What is the value of K at 298K for the following reaction? (Please give your

1) What is the value of K at 298K for the following reaction? (Please give your answer to two significant digits) 3A2+(aq) + 2B(s) 2B3+(aq) + 3A(s) A2+(aq) + 2e- A(s) Eored = -0.3…

1) What is the value of Q when each reactant and product is in its standard stat

1) What is the value of Q when each reactant and product is in its standard state? (See Section 10.10 in the textbook for the definition of standard states.) What is the value of …

1) What is the wavelength of light (in nm) if the frequency is 9.8 x 10^14 (1/se

1) What is the wavelength of light (in nm) if the frequency is 9.8 x 10^14 (1/sec)? 2) What is the wavelength of light (in nm) if the energy of the wave is 2.40 x 10^-19 J? 3) Wha…

1) What is/are the spectator ion(s) for the following chemical reaction? Check a

1) What is/are the spectator ion(s) for the following chemical reaction? Check all that apply. Pb(NO3)2(aq) + Na2S(aq) --> PbS(s) + 2 NaNO3(aq) --------------------------------…

1) What is/are the spectator ion(s) of the following chemical reaction? NaOH(aq)

1) What is/are the spectator ion(s) of the following chemical reaction? NaOH(aq) + CH3COOH(aq) --> NaCH3COO(aq) + H2O(l) 2)A beaker of NaOH solution is mixed with another beake…

1) What kind of acid is the active component in \"The Works\" toilet bowl cleane

1) What kind of acid is the active component in "The Works" toilet bowl cleaner? 2) If 23 ml of 1.4 M NaOH was required to neutralize 10.0 ml of HCl, what is the molarity of the H…

1) What kind of acid is the active component in \"The Works\" toilet bowl cleane

1) What kind of acid is the active component in "The Works" toilet bowl cleaner? 2)If 33 ml of 1.7 M NaOH was required to neutralize 10.0 ml of HCl, what is the molarity of the HC…

1) What mass of NaCl is dissolved in 250 g of water in a0.050m solution. 2) calc

1) What mass of NaCl is dissolved in 250 g of water in a0.050m solution. 2) calculate the freezing points of aqueous solutions of 0.10m glucose and 0.10 m barium chloride (BaCl2) …

1) What mass of ammonium chloride should be added to 2.50 L of a 0.160 M NH3 in

1) What mass of ammonium chloride should be added to 2.50 L of a 0.160 M NH3 in order to obtain a buffer with a pH of 9.55? 2) A 350.0 mL buffer solution is 0.140 M in HFand 0.140…

1) What product(s) will be formed in the S N 2 reaction of (R)-2-bromopentane wi

1)What product(s) will be formed in the SN2 reaction of (R)-2-bromopentane with sodium cyanide? A) A racemic mixture of both enantiomers of 2-cyanopentane B) (S)-2-cyanopentane C)…

1) What quantitiy in moles of oxygen is consumed when 369.3 kJ of energy is evol

1) What quantitiy in moles of oxygen is consumed when 369.3 kJ of energy is evolved from the combustion of a mixture of H2 (g) and O2(g)? H2(g)+ 1/2 O2 (g) H2O (l) Enthalpy of rea…

1) What simple test can be performed to show that 3-chlorobenzoic acid is not el

1) What simple test can be performed to show that 3-chlorobenzoic acid is not eluted from the chromotography column?  TLC possibly? 2) Predict the order of elution of a mixture of…

1) What two properties does a gas chromatogram take advantage of to create a sep

1) What two properties does a gas chromatogram take advantage of to create a separation? A) density and polarity B) molecular weight and polarity C) polarity and boiling point D) …

1) What type of intermediate forms when a solvated electron adds to an alkyne? a

1) What type of intermediate forms when a solvated electron adds to an alkyne? a. Neutral radical b. Radical cation c. Cation d. Anion e. Radical anion 2) Which of the following s…

1) What type of intermediate is formed in the polymerization of styrene with but

1) What type of intermediate is formed in the polymerization of styrene with butllithium? a) radical b) carbanion c) carbine d) carbocation 2) Which of the following is not a copo…

1) What type of intermediate is formed in the polymerization of styrene with but

1) What type of intermediate is formed in the polymerization of styrene with butllithium? a) radical b) carbanion c) carbine d) carbocation 2) Which of the following is not a copo…

1) What type of intermolecular forces must be overcome in converting each of the

1) What type of intermolecular forces must be overcome in converting each of the following from a liquid to a gas? (circle all that apply) (a) CO2 dispersion dipole-dipole hydroge…

1) What volume (in liters) of water vapor will be produced when 38 L of H2 and 1

1) What volume (in liters) of water vapor will be produced when 38 L of H2 and 19 L of O2 react according to the equation given below? (assume that the reactants and product are a…

1) What volume of 0.25 M HNO3 (aq) reacts with 4.8 ml of 0.150 M Na2CO3 (aq) whe

1) What volume of 0.25 M HNO3 (aq) reacts with 4.8 ml of 0.150 M Na2CO3 (aq) when the two solutions are mixed?please show work step by step. 2)A solution of hydrogen peroxide, H2O…

1) What volume of 12.0 M HCl is needed to make 5.00 L of 0.211 M HCl solution? _

1) What volume of 12.0 M HCl is needed to make 5.00 L of 0.211 M HCl solution? _____ mL 2) A solution is made by adding 25.6 g of KNO3 to water until the solutions volume is 750.0…

1) What volume of water would you add to 15.0 mL of 12 M HCl to make it to 6 M s

1) What volume of water would you add to 15.0 mL of 12 M HCl to make it to 6 M solution? 2)To prepare 0.20 M NaOH (40.0 g/mol) you will need to dilute 34 g of NaOH to ____ mL. 3)T…

1) What volume will 300 mL of gas at 20 C and a pressure of 335 mmHg occupy if t

1) What volume will 300 mL of gas at 20 C and a pressure of 335 mmHg occupy if the temperature is reduced to -80 C and the pressure increased to 760 mmHg? 2) A sample of gas of ma…

1) What would be the effect of each of the following on the calculated molecular

1) What would be the effect of each of the following on the calculated molecular weight of a solute? a) Some cyclohexane evaporated while the freezing point of pure cyclohexane wa…

1) Whee the reaction ham bekw is coevecily halanced the coelSclents in order e D

1) Whee the reaction ham bekw is coevecily halanced the coelSclents in order e D) 3,2,362,6 2)Ralance cach of the following egations 3) Which sample contains the snallest number o…

1) When 0.119 g of Zn(s) is combined with enough HCl to make 51.6 mL of solution

1) When 0.119 g of Zn(s) is combined with enough HCl to make 51.6 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from …

1) When 10ug of an enzyme (MW 50,000) is added to a reaction mixture containing

1) When 10ug of an enzyme (MW 50,000) is added to a reaction mixture containing its substrate at a concentration one hundred times the Km, it catalyzes the conversion of 75umol of…

1) When 25.0 mL of a 4.14×10-4 M silver nitrate solution is combined with 25.0 m

1) When 25.0 mL of a 4.14×10-4 M silver nitrate solution is combined with 25.0 mL of a 3.60×10-5 M potassium iodide solution does a precipitate form? (yes or no) For these conditi…

1) When 5.00g of copper reacts with oxygen, the copper oxide product has a mass

1) When 5.00g of copper reacts with oxygen, the copper oxide product has a mass of 5.62g. What is the empirical formula of this copper oxide? MM Cu= 63.5, O= 16.0 2) What is the m…

1) When 5.00g of copper reacts with oxygen, the copper oxide product has a mass

1) When 5.00g of copper reacts with oxygen, the copper oxide product has a mass of 5.62g. What is the empirical formula of this copper oxide? MM Cu= 63.5, O= 16.0 2) What is the m…

1) When 6.580 grams of a hydrocarbon, C x H y , were burned in a combustion anal

1) When 6.580 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 20.16 grams of CO2 and 9.631 grams of H2O were produced. In a separate experiment, the …

1) When H 2 (g) reacts with C 2 H 4 (g) to form C 2 H 6 (g) , 137 kJ of energy a

1)WhenH2(g)reacts withC2H4(g)to formC2H6(g),137kJ of energy areevolvedfor each mole ofH2(g)that reacts. Write a balanced thermochemical equation for the reaction with an energy te…

1) When H 2 (g) reacts with C 2 H 4 (g) to form C 2 H 6 (g) , 137 kJ of energy a

1)WhenH2(g)reacts withC2H4(g)to formC2H6(g),137kJ of energy areevolvedfor each mole ofH2(g)that reacts. Write a balanced thermochemical equation for the reaction with an energy te…

1) When a mole fraction of a solute is one, based on the definition there is? a)

1) When a mole fraction of a solute is one, based on the definition there is? a) 1.0 g of solute per 100g of solution b) is a 1:1 ratio of solute to solvent c) only solute present…

1) When a sample of oxalic acid (H 2 C 2 O 4 ), which is a diprotic acid, is tit

1) When a sample of oxalic acid (H2C2O4), which is a diprotic acid, is titrated with 0.250 M potassium hydroxide solution, 24.44 mL of the potassium hydroxide solution are require…