Chemistry concepts and calculations

1) A volume of 10.00 L pure liquid H 2 O at 90.0 A volume of 10.00 L pure liquid

1) A volume of 10.00 L pure liquid H2O at 90.0 A volume of 10.00 L pure liquid H2O at 90.0 degree C has a specific gravity of 1.036. What is the mass (in kg) of this system? Show …

1) A web cache A) pays out a lot of money to the network provider B) increases t

1) A web cache A) pays out a lot of money to the network provider B) increases traffic and response times for network end-users C) can be performed at the individual browser level…

1) A) An electron in the n = 4 level of the hydrogen atom relaxes to a lower ene

1) A) An electron in the n = 4 level of the hydrogen atom relaxes to a lower energy level, emitting light of = 97.3 nm . Find the principal level to which the electron relaxed.   …

1) A) How many kilograms of water can be evaporated from a 1 m 2 surface of wate

1) A) How many kilograms of water can be evaporated from a 1 m2 surface of water in a lake on a hot, clear summer day, if it is assumed that the limiting factor is the Sun's heat …

1) A) How many moles of Br are there in a sample of Br that contains 3.15×10 24

1) A) How many moles of Br are there in a sample of Br that contains 3.15×1024atoms? moles B) How many Ba atoms are there in 4.39 moles of Ba? atoms 2) How many moles of Br are th…

1) A) a calorimeter contains 33.0mL of water at 13.0 Celcius. when 2.50 g of X (

1) A) a calorimeter contains 33.0mL of water at 13.0 Celcius. when 2.50 g of X ( a substance with a molar mass of 82.0g/mol) is added, it dissolves via the reaction               …

1) A) a calorimeter contains 33.0mL of water at 13.0 Celcius. when 2.50 g of X (

1) A) a calorimeter contains 33.0mL of water at 13.0 Celcius. when 2.50 g of X ( a substance with a molar mass of 82.0g/mol) is added, it dissolves via the reaction X(s)+H2O(L)---…

1) A) two properties are consider in comparing the strength of intermolecular fo

1) A) two properties are consider in comparing the strength of intermolecular forces in solids and liquids. those are : 1) vapour pressure 2) boiling point. vapour pressure is mor…

1) A- In this reaction, the position of equilibrium can be shifted to the right

1) A- In this reaction, the position of equilibrium can be shifted to the right by continuously removing cyclohexene or water as they are formed. If we use a fractional distillati…

1) ATP is primarily generated by which organelle? nucleus mitochondria lysosome

1) ATP is primarily generated by which organelle? nucleus mitochondria lysosome gogli 2) Which of the following is an example of a serine threonine kinase? Jak - STAT receptor TGF…

1) According to Le Châtelier\'s principle, if the volume of the vessel containin

1) According to Le Châtelier's principle, if the volume of the vessel containing the equilibrium system shown below is decreased, there will be an increase in the concentration of…

1) According to the activity series, which of these metals will react with most

1) According to the activity series, which of these metals will react with most acids to produce H2 gas? Ag, Ni, or K? 2) Calculate the molarity: a) 0.750 mol of Na2S in 1.30L of …

1) According to the following reaction, how many grams of water are required for

1) According to the following reaction, how many grams of water are required for the complete reaction of 28.3 grams of silicon tetrafluoride? silicon tetrafluoride (s) + water (l…

1) Acetate buffer is often used as a buffer solution for proteinstudies at acidi

1) Acetate buffer is often used as a buffer solution for proteinstudies at acidic pH (from 3.6 to 5.6). The dissociation reaction is: CH3COOH CH3COO- +H+ Here CH3COOH (abbreviated…

1) Air is 21% oxygen and .03% carbon dioxide STP a)Asume a person expands their

1) Air is 21% oxygen and .03% carbon dioxide STP a)Asume a person expands their lungs to breath 1.4 L of air. How many moles of oxygen gas have they inhaled? b) This same person v…

1) All atoms consist of a central nucleus surrounded by one or more orbital elec

1) All atoms consist of a central nucleus surrounded by one or more orbital electrons. The nucleus always contains proton and all nuclei heavier than hydrogen contain neutrons too…

1) All of the common noble gasses are monotomic and low boiling. Their boiling p

1) All of the common noble gasses are monotomic and low boiling. Their boiling points in degrees celcius are: Ne, -245; Ar -186; Kr -152; Xe -107. Using the Periodic Table, predic…

1) Along with the pH scale, there is the pOH scale, which indicates the level of

1) Along with the pH scale, there is the pOH scale, which indicates the level of "basicity" in a solution. Accordingly, pOH = -log[OH-]. What is the sum of the pH and the pOH of a…

1) Although we have not yet discussed fatty acid catabolism in detail, you have

1) Although we have not yet discussed fatty acid catabolism in detail, you have been exposed to enough information to answer the following. Which “fuel” molecule provides the grea…

1) Alum is a compound used in a variety of applications including cosmetics, wat

1) Alum is a compound used in a variety of applications including cosmetics, water purification, and as a food additive. It can be synthesized from aluminum metal, sulfuric acid, …

1) Aluminum reacts with aqueous sodium hydroxide to produce hydrogen gas accordi

1) Aluminum reacts with aqueous sodium hydroxide to produce hydrogen gas according to the following equation: 2Al(s) + 2NaOH(aq) + 6H2O(l) =====> 2NaAl(OH)4(aq) + 3H2(g) The pr…

1) Americium-241 is used in some smoke detectors. It is an alpha emitter with a

1) Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 33.0 % of an Am-241 sample to decay? Exp…

1) Ammonia (NH 3 ) accepts a proton from water. Which of the statements listed b

1) Ammonia (NH3) accepts a proton from water. Which of the statements listed below is true according to Bronsted-Lowry definitions? a) Ammonia is a base. b) Ammonia is an acid. c)…

1) An alkane is a compound having only C-C and C-H single bonds. A. true B. fals

1) An alkane is a compound having only C-C and C-H single bonds. A. true B. false 2) An alkene is a compound having a carbon-carbon double bond. A. True B. False 3) An cycloalkane…

1) An alkane is a compound having only C-C and C-H single bonds. A. true B. fals

1) An alkane is a compound having only C-C and C-H single bonds. A. true B. false 2) An alkene is a compound having a carbon-carbon double bond. A. True B. False 3) An cycloalkane…

1) An antacid was mixed with a known concentration of hydrochloric acid 2) After

1) An antacid was mixed with a known concentration of hydrochloric acid 2) After the reaction above was completed, a titration was conducted using NaOH(known concentration). 3) Th…

1) An aqueous solution contains 0.22 M ammonium perchlorate . One liter of this

1) An aqueous solution contains 0.22 M ammonium perchlorate. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains consta…

1) An aqueous solution is 13.6% nonvolatile and nonelectrolyte solute (32.05 g/m

1) An aqueous solution is 13.6% nonvolatile and nonelectrolyte solute (32.05 g/mol) by mass and has a density of 0.981 g/mL. If Kf of water is 1.86 oC/m, what is the freezing poin…

1) An aqueous solution of calcium hydroxide is standardized by titration with a

1) An aqueous solution of calcium hydroxide is standardized by titration with a 0.144 M solution of nitric acid. If 15.3 mL of base are required to neutralize 26.9 mL of the acid,…

1) An electric range burner weighing 669.0 grams is turned off after reaching a

1) An electric range burner weighing 669.0 grams is turned off after reaching a temperature of 463.8°C, and is allowed to cool down to 22.2°C. Calculate the specific heat of the b…

1) An energetically excited hydrogen atom has its electron ina 5f sublevel. The

1) An energetically excited hydrogen atom has its electron ina 5f sublevel. The electron drops down to the 3d sublevel,releasing a photon in the process. Given the values:     R =…

1) An ideal gas flows through a throttle whose inlet pipe diameter is the same a

1) An ideal gas flows through a throttle whose inlet pipe diameter is the same as the exit pipe diameter and the pressure drops. Will the velocity: a) increase b) stay the same c)…

1) An idela gas in a sealed container has a initial volume of 2.45 L. At constan

1) An idela gas in a sealed container has a initial volume of 2.45 L. At constant pressure, it is cooled to 19.00°C where its final volume is 1.75 L. Wht was the initial temperatu…

1) An important organic solvent is: A) citral. B) menthone . C) acetone. D) benz

1) An important organic solvent is: A) citral. B) menthone . C) acetone. D) benzaldehyde. 2) Formaldehyde is a __________ at room temperature. A) Liquid. B) can't tell. C) solid. …

1) An object is 32 cm in front of a convex mirror with a focal length of -20 cm.

1) An object is 32 cm in front of a convex mirror with a focal length of -20 cm. Use ray tracing to determine the position of the image. Express your answer to two significant fig…

1) An old sample of concentrated sulfuric acid to be used in the laboratory is a

1) An old sample of concentrated sulfuric acid to be used in the laboratory is approximately 97.5 percent H2SO4 by mass. Calculate the Molarity of the acid solution. The density o…

1) An old sample of concentrated sulfuric acid to be used in the laboratory is a

1) An old sample of concentrated sulfuric acid to be used in the laboratory is approximately 97.5 percent H2SO4 by mass. Calculate the Molarity of the acid solution. The density o…

1) An open tubular GC column has an inner diameter of 300 micrometer and it is c

1) An open tubular GC column has an inner diameter of 300 micrometer and it is coated inside with a layer of stationary phase that is 2.0 micrometer in thickness. On this column, …

1) An solution of an equimolar mixture of propanoic acid (propionic acid), CH3CH

1) An solution of an equimolar mixture of propanoic acid (propionic acid), CH3CH2COOH, and its conjugate base has a pH of 4.87. Draw the structural formula that predominates at pH…

1) An unavoidable side reaction of alkyl halides with active metals which lowers

1) An unavoidable side reaction of alkyl halides with active metals which lowers the yield of Grignard reagents is called coupling. 2RX + Mg ------> R-R + MgX2 Although the mec…

1) An unavoidable side reaction of alkyl halides with active metals which lowers

1) An unavoidable side reaction of alkyl halides with active metals which lowers the yield of Grignard reagents is called coupling. 2RX + Mg ------> R-R + MgX2 Although the mec…

1) An unavoidable side reaction of alkyl halides with active metals which lowers

1) An unavoidable side reaction of alkyl halides with active metals which lowers the yield of Grignard reagents is called coupling. 2RX + Mg ------> R-R + MgX2 Although the mec…

1) Answer 2) On a Txy or Hxy diagram, a \'tie line\' .... (select all that apply

1) Answer 2) On a Txy or Hxy diagram, a 'tie line' .... (select all that apply) Answer is an isotherm - a line of constant temperature. connects two points in equilibrium, one on …

1) Answer the following question based on a 0.002 M solution of chloroacetic aci

1) Answer the following question based on a 0.002 M solution of chloroacetic acid. Ka = 1.4x10-3 a) Calculate the equilibrium concentration of CH2ClCOOH, H3O+, CH2ClCOO- b) Calcul…

1) Answer the following the questions regarding an acetic acid buffer solution.

1) Answer the following the questions regarding an acetic acid buffer solution. a) A solution was prepared by dissolving 0.024 moles of acetic acid (HOAc; pKa =4.8 ) in water to g…

1) Aqueous ammonia solution NH3(aq) + H2O (l) arrows NH4+1 (aq) + OH-1 (aq) upon

1) Aqueous ammonia solution NH3(aq) + H2O (l) arrows NH4+1 (aq) + OH-1 (aq) upon addition of NH4Cl in what direction did equilibrium shift? What ion caused shift?why 2) cobalt(ii)…

1) Are all infinite sets the same size? Is the set of even integers the same siz

1) Are all infinite sets the same size? Is the set of even integers the same size as the set of integers? How do you tell? Is the set of complex numbers significantly larger than …

1) Arrange the following in order of decreasing base strength (strongest base fi

1) Arrange the following in order of decreasing base strength (strongest base first) A. CH,CH2O B. NH2 C. CH,CH2 D. H-CEC 2) When an aldehyde is reacted with an alkyl lithium comp…

1) Arrange the following in order of decreasing base strength (strongest base fi

1) Arrange the following in order of decreasing base strength (strongest base first). A. CH,CH20 C. CH,CH2 D. H-CEC a) D B>C>A b)C>B>A D cA>CD B d)C> B>D>A…

1) As a city planner, you receive complaints from local residents about the safe

1) As a city planner, you receive complaints from local residents about the safety of nearby roads and streets. One complaint concerns a stop sign at the corner of Pine Street and…