Questions and answers by

cheri

Questions (129)

if a movie theater holds 1200 and 2/3 of its seat how many tickets does sell
1. 5 answers
2. 772 views
What is the exposition in the book Poseidon's arrow?
1. 1 answer
2. 452 views
I am having problems writing a essay and not really sure how to start.
1. 1 answer
2. 337 views
Rank the compoundsCH3OH CH3CH2OH CH3CH2CH2OH in terms of increasing evaporation rate. 1. CH3CH2CH2OH < CH3OH < CH3CH2OH 2. CH3OH
1. 2 answers
2. 5,986 views
What amount of energy is required to com-pletely ionize 26.9 grams of carbon atoms in the gas phase (C(g)) if the ionization
1. 1 answer
2. 714 views
Benzene is a hydrocarbon that is commonlyused as a commercial solvent. However, it is carcinogenic; i.e., accumulations in the
1. 1 answer
2. 695 views
Use the Clausius-Clapeyron equation to cal-culate the temperature at which pure water would boil at a pressure of 434 torr. The
1. 4 answers
2. 662 views
If 310mL of 2.2molar HCl solution is added to135 mL of 3.6 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the
1. 1 answer
2. 540 views
A 37 mL sample of a solution of sulfuric acidis neutralized by 42 mL of a 0.113 M sodium hydroxide solution. Calculate the
1. 1 answer
2. 568 views
In neutralization reactions,acid + base ! salt + water HCl can be neutralized with NaOH. How many moles of NaOH will it take to
1. 1 answer
2. 559 views
If 300 mL of 3.9 molar HCl solution is addedto 200 mL of 2.2 molar NaOH solution, what will be the molarity of NaCl in the
1. 2 answers
2. 1,005 views
A 0.456 gram sample of an unknown mono-protic acid (let’s call it HZ) was dissolved in some water (you pick the amount). Then
1. 1 answer
2. 2,353 views
Which ofI) HCl II) HF III) LiOH IV) HClO2 V) HNO3 are strong acids or strong bases in water?
1. 4 answers
2. 2,415 views
Acid rain has a pH value of 3.0, whereasnormal rain has a pH value of 5.6. Calculate the ratio of the hydronium ion in acid rain
1. 2 answers
2. 1,584 views
Given the following information, which ofthe following shows the acids in order from strongest to weakest? The order of atomic
1. 2 answers
2. 2,738 views
Arrange the basesI) deuterated ammonia (ND3) Kb = 1.1 × 10−5; II) hydrazine (NH2NH2) Kb = 1.7 × 10−6; III) hydroxylamine
1. 0 answers
2. 1,203 views
Iron pyrite (FeS2) is the form in whichmuch ofthe sulfur exists in coal. In the combustion of coal, oxygen reacts with iron
1. 2 answers
2. 1,356 views
We drop 37.4 grams of magnesium into461 mL of a 3 M HCl solution. What is the maximum volume of dry hydrogen that could be
1. 0 answers
2. 679 views
We observe that 5 grams of a gaseous com-pound occupies 1526 mL at 49�C and 672 torr. What is the molecular weight of the com-
1. 1 answer
2. 388 views
An apparatus consists of a 2 L flask containingnitrogen gas at 25�C and 819 kPa, joined by a valve to a 12 L flask containing
1. 3 answers
2. 1,696 views
We observe that 5 grams of a gaseous com-pound occupies 1526 mL at 49�C and 672 torr. What is the molecular weight of the com-
1. 1 answer
2. 376 views
A 6.9 gram sample of a gaseous substanceoccupies 10 L at 63�C and 537 torr. What is the density of the gas under these
1. 3 answers
2. 1,025 views
We mix 146 grams of oxygen gas with117 grams of argon gas in a volume of 436 mL at 58�C. What will be the final pressure of the
1. 1 answer
2. 778 views
Jeff and Jill go canoeing. While reaching to feed a duck, the boat flips. Jeff and Jill blowup their inflatable life preservers
1. 1 answer
2. 714 views
What pressure would a mixture of 3.2 gramsof O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 5.1
1. 7 answers
2. 3,516 views
An oxygen sample has a volume of 5 L at 27�Cand 800 torr. How many oxygen molecules does it contain?
1. 2 answers
2. 1,772 views
Nitroglycerin is a shock-sensitive liquid thatdetonates by the reaction 4C3H5(NO3)3(`) −! 6N2(g) + 10H2O(g) + 12CO2(g) + O2(g)
1. 1 answer
2. 597 views
A 115 mg sample of eugenol, the compoundresponsible for the odor of cloves, was placed in an evacuated flask with a volume of
1. 1 answer
2. 2,022 views
What is the density of hydrogen sulfide (H2S)at 0.9 atm and 295 K? Answer in units of g/L
1. 2 answers
2. 674 views
A sample of gas occupies 4 mL at STP. Atwhat pressure would this sample occupy 500 mL if the temperature is changed to 525�C?
1. 2 answers
2. 919 views
To what temperature must a sample of heliumgas be cooled from 123�C to reduce its volume from 3.7 L to 0.27 L at constant
1. 1 answer
2. 580 views
A 1.50 liter tank filled with helium at 125 atmis used to fill balloons. The pressure in each balloon is 950 torr and the volume
1. 1 answer
2. 1,623 views
Suppose that a sample of gas occupies 117 mLof volume at 25�C and a pressure of 289 torr. What would be the volume if the
1. 1 answer
2. 679 views
On a hot sunny day in August, the weather-man reports that the barometric pressure is 49 atm atmospheres. How many Pascals is
1. 2 answers
2. 826 views
The systemCO2(g) + H2(g) *) H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00
1. 2 answers
2. 2,471 views
The numerical value of the concentrationequilibrium constant for the gaseous reaction 2 SO2 + O2 *) 2 SO3 is 0.5 at temperature
1. 1 answer
2. 1,314 views
At 350 K, Kc = 0.142 for the reaction2BrCl(g) *) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal
1. 1 answer
2. 663 views
At a certain temperature, the equilibriumconstant Kc is 0.154 for the reaction 2 SO2(g) + O2(g) *) 2 SO3(g) What concentration
1. 2 answers
2. 1,022 views
Consider the reactionNi(s) + 4CO(g) ! Ni(CO)4(g) Assuming the gases are ideal, calculate the work done on the system at a
1. 3 answers
2. 2,471 views
How much work is done by the system when2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 8.1 liters against a
1. 1 answer
2. 608 views
What is the value of w (work) when 1.3 molesof H2 expands from 25 liters to 50 liters against a constant external pressure of 1
1. 1 answer
2. 1,153 views
1.95 mol of an ideal gas at 300 K and 3.00atm expands from 16 L to 28 L and a final pressure of 1.20 atm in two steps: (1) the
1. 0 answers
2. 981 views
A sample of gas in a cylinder of volume 4.09 Lat 289 K and 3.43 atm expands to 7.73 L by two different pathways. Path A is an
1. 0 answers
2. 1,060 views
How much heat is released if 2.00 molesCF2Cl2 reacts with 70.0 g F2 with a 75.0 percent yield? CF2Cl2 + F2 ! CF4 + Cl2 �H for
1. 2 answers
2. 2,666 views
Propane (C3H8) is burned in oxygen to pro-duce carbon dioxide and water. The heat of combustion of propane is -2012 kJ/mole. How
1. 1 answer
2. 746 views
The energy change �H associated with thereaction NBr3(g) + 3H2O(g) ! 3HOBr(g) + NH3(g)is +81 kJ/mol rxn. These bond energy
1. 1 answer
2. 1,623 views
Which of the following reactions as writtencorresponds to a standard formation reaction? 1. 2H (g) + O2(g) ! H2O2 (`) 2. Na(s) +
1. 2 answers
2. 3,937 views
Carbon monoxide reacts with oxygen to formcarbon dioxide by the following reaction: 2CO(g) + O2(g) ! 2CO2(g) �H for this
1. 1 answer
2. 1,016 views
What types of intermolecular interactionsdoes chloroform (CH3Cl) exhibit? I) London dispersion II) dipole-dipole III) hydrogen
1. 1 answer
2. 2,754 views
Calculate the standard reaction enthalpy forthe reaction NO2(g) ! NO(g) + O(g) Given: O2(g) ! 2O(g) �H� = +498.4 kJ/mol NO(g) +
1. 1 answer
2. 916 views
Consider the reaction2 Al2O3(s) -> 4 Al(s) + 3 O2(g) . �H = +3339.6 kJ/mol How much heat is generated when 0.455 L of a 3.60 M
1. 2 answers
2. 1,175 views
3.5 g of a hydrocarbon fuel is burned in a ves-sel that contains 250. grams of water initially at 25.00 C. After the combustion,
1. 2 answers
2. 879 views
Consider the reaction2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . �H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al
1. 2 answers
2. 800 views
The reaction2Na+ + 2Cl− ! 2Na + Cl2 is indicative of ? cell; the sign of the anode is ? ; and ? forms at the cathode. 1. an
1. 2 answers
2. 3,015 views
Sodium, potassium, and rubidium are good1. oxidizing agents. 2. reducing agents. 3. bases.
1. 2 answers
2. 1,564 views
A saturated solution of which of the follow-ing substances in water would be the best conductor of electricity? 1. CH4 2. Hg2Cl2
1. 1 answer
2. 1,666 views
What is a poor conductor of electricity?1. mercury 2. molten NaCl 3. copper 4. potassium 5. sulfur
1. 1 answer
2. 889 views
For an electrochemical reduction process,electrons are 1. taken from solution species at the surface of the cathode. 2. added to
1. 1 answer
2. 986 views
Chlorine, bromine, and iodine are good1. oxidizing agents. 2. reducing agents. 3. bases.
1. 1 answer
2. 1,336 views
In a voltaic cell, electrons flow from the ?to the ? in the external circuit. 1. cathode; anode 2. products; reactants 3. anode;
1. 1 answer
2. 994 views
A battery has two electrodes labeled anodeand cathode. Electrons flow from the (anode, cathode) to the (anode, cathode) through
1. 1 answer
2. 865 views
Very small mercury batteries have been madeand used in a multitude of applications. Why have they been replaced by other kinds
1. 1 answer
2. 772 views
A ruptured tank in Anywhere, USA, spilledhydrochloric acid. Officials were reported to be concerned that the acid might mix with
1. 2 answers
2. 1,126 views
Which of the following metals or nonmetalsare expected to displace Mn or Cl (respec- tively) from MnCl2? 1. Cu should displace
1. 0 answers
2. 598 views
Classify the reaction(NH4)2Cr2O7 ! N2 + 4 H2O + Cr2O3 as one or more of the following: Z1) combination Z4) metathesis Z2)
1. 2 answers
2. 2,452 views
Identify the type of reactionC4H10(g) + O2(g) ! CO2(g) + H2O(g) 1. hydrocarbon synthesis 2. single displacement 3. incomplete
1. 1 answer
2. 3,773 views
The net ionic equation for ALL aqueous reac-tion of strong acids and strong soluble basesthat form soluble salts is 1. the
1. 1 answer
2. 961 views
Which of the following is best described as anacid-base reaction? 1. NaCl + AgNO3 !NaNO3 + AgCl 2. NH3 + H2O ! NH+ 4 + OH− 3.
1. 1 answer
2. 802 views
If aqueous hydrofluoric acid is reacted withsodium hydroxide, which of the following sub- stances are in the net ionic equation?
1. 1 answer
2. 710 views
A volume of equimolar strong acid like HClis mixed with an equal volume of equimolar strong base like NaOH in a beaker of water.
1. 0 answers
2. 1,362 views
An excess of aqueous AgNO3 reacts with44.5 mL of 5 M K2CrO4(aq) to form a precip- itate. What is the precipitate? 1. K2CrO4 2.
1. 2 answers
2. 1,033 views
An excess of aqueous AgNO3 reacts with44.5 mL of 5 M K2CrO4(aq) to form a precip- itate. What is the precipitate? 1. K2CrO4 2.
1. 2 answers
2. 1,197 views
Which compound on the left, when dissolvedin water, does not produce the corresponding compound(s) on the right? 1. CaO !
1. 1 answer
2. 497 views
HCN is mixed with water. Which is the bestdescription of what you would expect to find in the solution? 1. CN+, OH−, and water
1. 2 answers
2. 1,451 views
HBr is mixed with water. Which is the bestdescription of what you would expect to find in the solution? 1. Br1−, OH1−, and
1. 1 answer
2. 807 views
An ion can be removed from an aqueous solu-tion by 1. the formation of a gas that escapes. 2. formation of a precipitate. 3. the
1. 3 answers
2. 1,141 views
Suppose that you wanted to be sure that ametal ion, any metal ion, would dissolve in water. What salt of the metal ion compound
1. 3 answers
2. 3,608 views
Which of the speciesKClO2, NH4Br, HNO2, PbS is/are insoluble in water? 1. NH4Br and NH3 2. KClO3 3. PbS 4. HNO2 5. All of these
1. 3 answers
2. 2,146 views
Which response includes all of the followingLiOH, KOH, Ni(OH)2, Mg(OH)2, Ca(OH)2 that are insoluble bases, and no others? 1.
1. 2 answers
2. 3,152 views
Which one of the following substances isLEAST soluble in water? 1. BaCO3 2. KSCN 3. Na3PO4 4. RbOH 5. LiBr
1. 2 answers
2. 2,976 views
Although soluble barium compounds aretoxic, suspensions of insoluble barium sul- fate are routinely swallowed for upper gas-
1. 1 answer
2. 589 views
Which of the following aqueous solutionsshould NOT form a precipitate with aque- ous Ba(NO3)2? 1. K3PO4 2. K2SO4 3. K2CO3 4. KOH
1. 4 answers
2. 2,622 views
Which of the following aqueous solutionsshould form a precipitate with aqueous Fe(NO3)3? 1. KNO3 2. KCl 3. K2SO4 4. KOH
1. 3 answers
2. 8,092 views
Consider the following reactionCaCl2(aq) + 2Ag2SO4(aq) ! CaSO4(?) + 2AgCl(?) .Which of the following statements is true? 1. Both
1. 4 answers
2. 2,044 views
A variety of ions including Na+, K+, NH4+, Pb2+, Fe2+, NO3 −, Cl−, Br−, S2−, and CO3 2− are mixed in a beaker of
1. 2 answers
2. 2,149 views
If you analyzed each of the substancesNaBr, KOH, CrPO4, Pb(OH)2, RbCl, LiNO3 by mixing them with water in a beaker, which
1. 4 answers
2. 3,936 views
What volume of water was added to the 350mL of NaOH solution? Assume volumes are additive. Answer in units of mL
1. 2 answers
2. 714 views
An unknown amount of water is mixed with350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is
1. 1 answer
2. 624 views
In choosing a primary standard we generallychoose something that 1. All of these are properties we want in a primary standard.
1. 3 answers
2. 1,904 views
What mass of silver nitrate (AgNO3) is re-quired to prepare 400 g of a 3.50% solution of AgNO3? 1. 14 g 2. 0.00875 g 3. 114.28 g
1. 2 answers
2. 533 views
Listerine mouthwash is 21.6%ethyl alcohol byvolume. What mass of ethanol is contained in 20.0 mL of mouthwash? (The density of
1. 1 answer
2. 671 views
A solution of sodium hydroxide is standard-ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the
1. 1 answer
2. 504 views
We add excess Na2CrO4 solution to 27.0 mLof a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has
1. 2 answers
2. 632 views
We add excess NaCl solution (58.44 g/mol) to56 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid
1. 1 answer
2. 828 views
How many milliliters of a 0.5 molar HClsolution are needed to react completely with 11 grams of zinc according to the following
1. 1 answer
2. 672 views
Silver nitrate (AgNO3) reacts with sodiumchloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . How many grams of
1. 2 answers
2. 947 views
What volume of 0.402MK3PO4 is required toreact with 43 mL of 0.507 M MgCl2 according to the equation 2K3PO4 + 3MgCl2 ! Mg3(PO4)2
1. 1 answer
2. 451 views
How many milliliters of a 0.16 M HCl solutionare needed to react completely with 4.8 g of zinc to form zinc(II) chloride? Answer
1. 1 answer
2. 504 views
A sample of 7.45 grams of NaOH is dissolvedinto 609 mL of aqueous 0.250 M NaOH (as-sume no volume change). This solution is then
1. 3 answers
2. 1,809 views
A sample of air contains 38.5 ìg/m3 of beryl-lium dust. How many atoms of beryllium are present in a room with dimensions of 8
1. 3 answers
2. 1,073 views