Chemistry concepts and calculations
117302 questions • Page 66 / 2347
1) How many moles of NH,CI and NH,OH must be added to 250 mL of water to make a
1) How many moles of NH,CI and NH,OH must be added to 250 mL of water to make a buffer of pH-9.0? Kb -1.8x10 2) How many milliters of 0.75 M HCI must be added to 120 mL of 0.90 M …
1) How many moles of NaOH would you need to neutralize 50.0 mL of 0.250M Acetic
1) How many moles of NaOH would you need to neutralize 50.0 mL of 0.250M Acetic Acid? 2) A student performs an aqueous titration between an unknown polyprotic acid with a knowrn c…
1) How many moles of S 2 O 3 2- are consumed for every mol of ClO - present in s
1) How many moles of S2O32- are consumed for every mol of ClO- present in solution? 2) In this experiment, the purpose of the standardization reaction is to convert the hypochlori…
1) How many moles of a gas fill a flask with a volume of 247mL at 102 degrees C
1) How many moles of a gas fill a flask with a volume of 247mL at 102 degrees C and a pressure of 774 torr? 2) If a student finds the molecular weight of an unknownliquid to be 14…
1) How many moles of sodium hydroxide would have to be added to 125 mL of a 0.49
1) How many moles of sodium hydroxide would have to be added to 125 mL of a 0.498 M hypochlorous acid solution, in order to prepare a buffer with a pH of 7.180? 2) An aqueous solu…
1) How many neutral resonance structures can you draw for benzene? Answer below
1) How many neutral resonance structures can you draw for benzene? Answer below only as a number - no signs or words. Draw them in your notebook. Leave a space for any revisions. …
1) How many neutral resonance structures can you draw for benzene? Answer below
1) How many neutral resonance structures can you draw for benzene? Answer below only as a number - no signs or words. Draw them in your notebook. Leave a space for any revisions. …
1) How many of the following names are incorrect? 3-methylbutane 5-ethyl-3-methy
1) How many of the following names are incorrect? 3-methylbutane 5-ethyl-3-methylhexane 1,3-dimethylpentane 2)How many of the following names are incorrect? 3-ethylhexane 4-ethyl-…
1) How many of the following names are incorrect? 3-methylbutane 5-ethyl-3-methy
1) How many of the following names are incorrect? 3-methylbutane 5-ethyl-3-methylhexane 1,3-dimethylpentane 2)How many of the following names are incorrect? 3-ethylhexane 4-ethyl-…
1) How many photons are emitted during a transition from a higher level orbit to
1) How many photons are emitted during a transition from a higher level orbit to a lower level orbit? a)1 b)2 c)3 d)4 2) Rank the following light regions in order of increasing wa…
1) How many photons are produced in a laser pulse of 0.225 J at 6100 nm? ______
1) How many photons are produced in a laser pulse of 0.225 J at 6100 nm? ______ photons 2) A line in the Brackett series of hydrogen has a wavelemgth of 26262 nm. From what state …
1) How many photons are produced in a laser pulse of 0.764 J at 593 nm? 2) Rank
1) How many photons are produced in a laser pulse of 0.764 J at 593 nm? 2) Rank the different types of electromagnetic radiation by wavelength from longest to shortest. (an orange…
1) How many significant figures are in the measurement, 263.900 m? 1) 2) What wa
1) How many significant figures are in the measurement, 263.900 m? 1) 2) What wavelength of light would you report in units of nm, if the light had a wavelength of 2) 1.65 x 10-10…
1) How many total atoms are in 0.640g of P2O5? - ________ atoms 2) A hydrated fo
1) How many total atoms are in 0.640g of P2O5? - ________ atoms 2) A hydrated form of copper sulfate (CuSO4 x H2O) is heated to drive off all the water. if we start with 8.64g of …
1) How many total atoms are in the formula Al2(CO3)3? A) 1 C) 12 D) 9 E) none of
1) How many total atoms are in the formula Al2(CO3)3? A) 1 C) 12 D) 9 E) none of the above 2) 2) Which among the following elements does NOT exist as a diatomic molecule in nature…
1) How manygrams of solute are present in 57.0 ml of 250 Mk2Cr2O7? 2) If 4.26 g
1) How manygrams of solute are present in 57.0 ml of 250 Mk2Cr2O7? 2) If 4.26 g of (NH4)2SO4 is dissolved in enough water toform 240 ml of solution, what is the molarity of…
1) How much did the Northwest Kansas Groundwater District 4 agree to decrease gr
1) How much did the Northwest Kansas Groundwater District 4 agree to decrease groundwater pumping over the next 5 years? 2a) How much irrigation water is supplied by the aquifer? …
1) How much heat energy in kJ must be removed from benzene, C6H6, at its freezin
1) How much heat energy in kJ must be removed from benzene, C6H6, at its freezing point to freeze 75.1 g benzene? The heat of fusion of benzene is 9.95 kJ/mol. 2)Calculate the hea…
1) How much heat is lost by 5 grams of a metal if the temperature changed from 9
1) How much heat is lost by 5 grams of a metal if the temperature changed from 90c to 40c? (c=3.95 J/gK) A) 987.5 J B) 63.3 J C) 177.5 J D) 790.0 J 2)Assume a piece of hot metal i…
1) How will you know when the pressure in the flask is equal to the pressure in
1) How will you know when the pressure in the flask is equal to the pressure in the room? ( Be specific) The volume of the container will be determined by using the density and ma…
1) Human activities contribute to climate change by causing changes in Earth’s a
1) Human activities contribute to climate change by causing changes in Earth’s atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The large…
1) Hydrates contain water in a stoichiometric quantity. What does this mean? 2)
1) Hydrates contain water in a stoichiometric quantity. What does this mean? 2) Why can you use calcium chloride to reduce the moisture in a humid basement area? 3) Plaster of Par…
1) Hydrogen bonding is shown by molecules containing hydrogen attached to: A) hi
1) Hydrogen bonding is shown by molecules containing hydrogen attached to: A) highly electronegative atoms B) highly electropositive atoms C) any atoms D) only oxygen 2) The equil…
1) Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, acc
1) Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, according to the equation 3H2(g) + N2(g)?2NH3 (g) a) How many grams of H2 are needed to produce 13.87 …
1) Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, acc
1) Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, according to the equation 3H2(g) + N2(g)?2NH3 (g) a) How many grams of H2 are needed to produce 13.87 …
1) Hydrogen peroxide, H2O2(aq), decomposes to H2O(l) and O2(g) in a reaction tha
1) Hydrogen peroxide, H2O2(aq), decomposes to H2O(l) and O2(g) in a reaction that is first order in H2O2 and has a rate constant k = 1.06×103 min1 at a given temperature. How long…
1) Hydrogen peroxide, H2O2(aq), decomposes to H2O(l) and O2(g) in a reaction tha
1) Hydrogen peroxide, H2O2(aq), decomposes to H2O(l) and O2(g) in a reaction that is first order in H2O2 and has a rate constant k = 1.06×103 min1 at a given temperature. How long…
1) I am considering remodeling my house, and have a 55 L tank of nitrogen in my
1) I am considering remodeling my house, and have a 55 L tank of nitrogen in my shed. This tank contains 15 kilograms of nitrogen gas and can withstand a pressure of 150 atm befor…
1) I had take-out Vietnamese soup for lunch on Saturday. To make sure the noodle
1) I had take-out Vietnamese soup for lunch on Saturday. To make sure the noodles did not get soggy, they packaged them separately, and then I mixed them to together to make my no…
1) I had take-out Vietnamese soup for lunch on Saturday. To make sure the noodle
1) I had take-out Vietnamese soup for lunch on Saturday. To make sure the noodles did not get soggy, they packaged them separately, and then I mixed them to together to make my no…
1) Identify the acid and the base in the following reactions. (Type your answer
1) Identify the acid and the base in the following reactions. (Type your answer using the format CO2 for CO2, (NH4)2CO3 for (NH4)2CO3, [NH4]+ for NH4+, and [Ni(CN)4]2- for Ni(CN)4…
1) Identify the effect of increasing acidity on the solubility of the following
1) Identify the effect of increasing acidity on the solubility of the following compounds.. Clasify the effect on each compound as either "increasie solubility" or "no change in s…
1) Identify the species oxidized, the species reduced, the oxidizing agent and t
1) Identify the species oxidized, the species reduced, the oxidizing agent and the reducing agent in the following electron transfer reaction. 3Sn2+ + 2Cr ----------> 3Sn + 2Cr…
1) Identify the species oxidized, the species reduced, the oxidizing agent and t
1) Identify the species oxidized, the species reduced, the oxidizing agent and the reducing agent in the following electron transfer reaction. 3Sn2+ + 2Cr ----------> 3Sn + 2Cr…
1) Identify whether entropy increases, decreases, or remains unchanged during ea
1) Identify whether entropy increases, decreases, or remains unchanged during each of the following processes. a) Freezing liquid water b) Dissolving sodium chloride crystals into…
1) If 0.235g of KHP requires 16.73 mL of NaOH solution to neutralize it, calcutl
1) If 0.235g of KHP requires 16.73 mL of NaOH solution to neutralize it, calcutlate the molartiry of the NaOH solution 2) If 21.32 mL of NaOH solution that was standardized in que…
1) If 0.2500 grams of potassium sulfate react with an excess of barium chloride,
1) If 0.2500 grams of potassium sulfate react with an excess of barium chloride, how many grams of barium sulfate will be produced? 2) What two things are done to maximize the siz…
1) If 1 drop (0.050 mL) of .20 M NaBr is added to 100.00 mL ofwater, what is the
1) If 1 drop (0.050 mL) of .20 M NaBr is added to 100.00 mL ofwater, what is the molarity of the NaBr in the resultingsolution? 2) Concentrated HNO3 is 15.4 M . How would you prep…
1) If 1.71g of the vapor of a volatile liquid is able to fill a 390-mL flask at
1) If 1.71g of the vapor of a volatile liquid is able to fill a 390-mL flask at 350C and 675mm Hg, what is the molecular weight of the liquid? 2) It was important that the flask b…
1) If 100.0mL water of at 50.0C is added to 100.0 mL of water at 20.0C. What tem
1) If 100.0mL water of at 50.0C is added to 100.0 mL of water at 20.0C. What temperature would the mixture of water reach? Assume the system is perfectly sealed and no heat is los…
1) If 100.0mL water of at 50.0C is added to 100.0 mL of water at 20.0C. What tem
1) If 100.0mL water of at 50.0C is added to 100.0 mL of water at 20.0C. What temperature would the mixture of water reach? Assume the system is perfectly sealed and no heat is los…
1) If 16.95 mL of 0.118 M NaOH is required to titrate a 10.00 mL of 0.100 M acid
1) If 16.95 mL of 0.118 M NaOH is required to titrate a 10.00 mL of 0.100 M acid, the acid could be a. H3AsO4 b. HNO2 c. H3PO4 d. HNO3 e. H2SO4 2.) 4.199 g of NaF(s) are dissolved…
1) If 1×10 3 of Cytosine is submitted to combustionanalysis, (a) Howmany moles o
1) If 1×103 ofCytosine is submitted to combustionanalysis, (a) Howmany moles of CO2 would be formed? (b) How manymoles of H2O would be formed? 2) How many moles …
1) If 2.566 g of Iron (II) chloride was dissolved in water and the final volume
1) If 2.566 g of Iron (II) chloride was dissolved in water and the final volume of solution was 250.00 mL, what is the molarity of total ions? 2) If 2.317 g of Iron (III) bromide …
1) If 2.566 g of Iron (II) chloride was dissolved in water and the final volume
1) If 2.566 g of Iron (II) chloride was dissolved in water and the final volume of solution was 250.00 mL, what is the molarity of total ions? 2) If 2.317 g of Iron (III) bromide …
1) If 20.0 g of MgSO47H2O is thoroughly heated, what mass of anhydrous magnesium
1) If 20.0 g of MgSO47H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain? 2) How many molecules are contained in a 4.50-g sample of dimethylmercury? Wh…
1) If 25.2 mL of 0.109 M acid with a pKa of 5.55 is titrated with 0.102 M NaOH s
1) If 25.2 mL of 0.109 M acid with a pKa of 5.55 is titrated with 0.102 M NaOH solution, what is the pH of the titration mixture after 13.7 mL of base solution is added? 2) If 28.…
1) If 5.00 ml of a solution containing 4.00 x 10 -2 M iron is placed in a 100.0
1) If 5.00 ml of a solution containing 4.00 x 10-2M iron is placed in a 100.0 ml volumetric flask and filled to themark with deionized water, what will be the concentration of iro…
1) If 570 mL of 0.96491 M aqueous CaCl 2 reacts stoichiometrically according to
1) If 570 mL of 0.96491 M aqueous CaCl2 reacts stoichiometrically according to the balanced equation, how many grams of solid Ca3(PO4)2 are produced? 3CaCl2(aq) + 2Na3PO4(aq) Ca3(…
1) If 6.02 x 10^23 molecules make up 28.0g of nitrogen, thenwhat is the mass of
1) If 6.02 x 10^23 molecules make up 28.0g of nitrogen, thenwhat is the mass of one molcule of nitrogen? 2) calculate the mass, in grams, of an oxygen atom. If oneoxygen atom has …
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