cheri

Questions and answers by visitors named cheri

Questions (129)

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.
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2. 3,001 views
Which ofI) HCl II) HF III) LiOH IV) HClO2 V) HNO3 are strong acids or strong bases in water?
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2. 2,319 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. 4 answers
2. 849 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. 6 answers
2. 3,838 views
What types of intermolecular interactionsdoes chloroform (CH3Cl) exhibit? I) London dispersion II) dipole-dipole III) hydrogen
1. 4 answers
2. 2,634 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. 3,412 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. 4 answers
2. 2,247 views
There is a regression model. E= a+bn. Where E is total earnings of the motion pictyre industry measured in dollars per year and
1. 1 answer
2. 432 views
Number sence What is the number?It is greater than 43 and less than 52. If you add the digit, the sum is 8. write the number
1. 1 answer
2. 391 views
What number am IMy tens digit is double my ones digit. I am less than 70 greater than 60? How do u figure this out need help to
1. 6 answers
2. 226 views
An electronics store receives a shipment of 20 graphing calculators, including 3 that are defective. Four of the calculators are
1. 5 answers
2. 7,412 views
a 7 yr old boy breaks his tibia and requires immobility by a hard cast for 6 weeks initl it heals. a potential consequence of
1. 1 answer
2. 327 views
5-(4y+5)=3+2(4y-6)how do i combine like terms and what do i do with these()?
1. 3 answers
2. 333 views
If a metal ore contains 21.9% pure metal, howmany pounds of pure metal can be obtained from 68 pounds of metal ore? Answer in
1. 2 answers
2. 494 views
A 25.2 g of iron ore is treated as follows. Theiron in the sample is all converted by a series of chemical reactions to Fe2O3.
1. 3 answers
2. 1,125 views
An ore contains Fe3O4 and no other iron. Theiron in a 54.6-gram sample of the ore is all converted by a series of chemical
1. 3 answers
2. 1,061 views
A 26.3754 g sample of impure magnesium car-bonate was heated to complete decomposition according to the equation MgCO3(s) !
1. 1 answer
2. 466 views
Sulfuric acid (H2SO4) is prepared commer-cially from elemental sulfur using the contact process. In a typical sequence of
1. 2 answers
2. 1,182 views
In the reaction below, 22 g of H2S with excessO2 produced 10 g of sulfur. ?H2S + ?O2 ! ? S + ?H2O. What is the percent yield of
1. 4 answers
2. 1,368 views
The reaction of 9.5 grams of fluorine withexcess chlorine produced 5.9 grams of ClF3. What percent yield of ClF3 was obtained?
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2. 1,177 views
Sulfuric acid (H2SO4) is prepared commer-cially from elemental sulfur using the contact process. In a typical sequence of
1. 2 answers
2. 573 views
It takes 62 mL of 0.124 M KOH to neutralize46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution?
1. 1 answer
2. 389 views
What volume of 6.58 M HNO3 is required toprepare 671 mL of a 2.7 M HNO3 solution?
1. 1 answer
2. 378 views
What mass of MgSO4 · 7H2O is required toprepare 300 mL of a 0.61 M MgSO4 solution? Answer in units of g
1. 3 answers
2. 2,686 views
What volume of 6.58 M HNO3 is required toprepare 671 mL of a 2.7 M HNO3 solution? Answer in units of mL
1. 2 answers
2. 491 views
It takes 62 mL of 0.124 M KOH to neutralize46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in
1. 2 answers
2. 1,109 views
How many milliliters of 5.5 M HCl must betransfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of
1. 4 answers
2. 654 views
Sulfuric acid (H2SO4) is a very strong diproticacid. If 0.062 moles of sulfuric acid is mixed with water to make 200 mililiter
1. 2 answers
2. 1,038 views
We have an aqueous solution that contains47% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 209
1. 4 answers
2. 735 views
When 0.025 moles of aluminum sulfate aredissolved in enough water to make 115 milliliters of solution, what is the molarity of
1. 3 answers
2. 2,428 views
Calculate the molality of CsCl in a 19% bymass aqueous solution.
1. 3 answers
2. 741 views
It takes 62 mL of 0.124 M KOH to neutralize46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in
1. 2 answers
2. 779 views
What mass of MgSO4 · 7H2O is required toprepare 300 mL of a 0.61 M MgSO4 solution? Answer in units of g
1. 2 answers
2. 684 views
How many milliliters of 5.5 M HCl must betransfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of
1. 1 answer
2. 427 views
Calculate the molality of acetone in anaqueous solution with a mole fraction for ace- tone of 0.171. Answer in units of m
1. 2 answers
2. 982 views
How many grams of sucrose (C12H22O11)must be dissolved in 200 g water to make a solution in which the mole fraction of su- crose
1. 4 answers
2. 2,325 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. 4 answers
2. 992 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. 4 answers
2. 1,696 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. 451 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. 361 views
Silver nitrate (AgNO3) reacts with sodiumchloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . How many grams of
1. 3 answers
2. 850 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. 2 answers
2. 574 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. 2 answers
2. 747 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. 3 answers
2. 553 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. 431 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. 2 answers
2. 586 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. 3 answers
2. 461 views
In choosing a primary standard we generallychoose something that 1. All of these are properties we want in a primary standard.
1. 4 answers
2. 1,825 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. 2 answers
2. 537 views
What volume of water was added to the 350mL of NaOH solution? Assume volumes are additive. Answer in units of mL
1. 4 answers
2. 661 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. 5 answers
2. 2,057 views
Consider the following reactionCaCl2(aq) + 2Ag2SO4(aq) ! CaSO4(?) + 2AgCl(?) .Which of the following statements is true? 1. Both
1. 5 answers
2. 1,961 views
Which of the following aqueous solutionsshould form a precipitate with aqueous Fe(NO3)3? 1. KNO3 2. KCl 3. K2SO4 4. KOH
1. 4 answers
2. 7,996 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. 5 answers
2. 2,539 views
Although soluble barium compounds aretoxic, suspensions of insoluble barium sul- fate are routinely swallowed for upper gas-
1. 2 answers
2. 514 views
Which one of the following substances isLEAST soluble in water? 1. BaCO3 2. KSCN 3. Na3PO4 4. RbOH 5. LiBr
1. 4 answers
2. 2,895 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. 4 answers
2. 2,087 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. 5 answers
2. asked by cheri
3. 3,460 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. 4 answers
2. 1,076 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. 2 answers
2. 723 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. 4 answers
2. 1,345 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. 444 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. 3 answers
2. 1,124 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. 3 answers
2. 954 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. 2 answers
2. 1,278 views
If aqueous hydrofluoric acid is reacted withsodium hydroxide, which of the following sub- stances are in the net ionic equation?
1. 2 answers
2. 623 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. 2 answers
2. 735 views
The net ionic equation for ALL aqueous reac-tion of strong acids and strong soluble basesthat form soluble salts is 1. the
1. 3 answers
2. 863 views
Identify the type of reactionC4H10(g) + O2(g) ! CO2(g) + H2O(g) 1. hydrocarbon synthesis 2. single displacement 3. incomplete
1. 3 answers
2. 3,685 views
Classify the reaction(NH4)2Cr2O7 ! N2 + 4 H2O + Cr2O3 as one or more of the following: Z1) combination Z4) metathesis Z2)
1. 4 answers
2. 2,349 views
Which of the following metals or nonmetalsare expected to displace Mn or Cl (respec- tively) from MnCl2? 1. Cu should displace
1. 2 answers
2. 527 views
A ruptured tank in Anywhere, USA, spilledhydrochloric acid. Officials were reported to be concerned that the acid might mix with
1. 3 answers
2. 1,066 views
Very small mercury batteries have been madeand used in a multitude of applications. Why have they been replaced by other kinds
1. 2 answers
2. 691 views
A battery has two electrodes labeled anodeand cathode. Electrons flow from the (anode, cathode) to the (anode, cathode) through
1. 2 answers
2. 755 views
In a voltaic cell, electrons flow from the ?to the ? in the external circuit. 1. cathode; anode 2. products; reactants 3. anode;
1. 2 answers
2. 914 views
Chlorine, bromine, and iodine are good1. oxidizing agents. 2. reducing agents. 3. bases.
1. 3 answers
2. 1,244 views
For an electrochemical reduction process,electrons are 1. taken from solution species at the surface of the cathode. 2. added to
1. 2 answers
2. 938 views
What is a poor conductor of electricity?1. mercury 2. molten NaCl 3. copper 4. potassium 5. sulfur
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2. 792 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. 3 answers
2. 1,597 views
Sodium, potassium, and rubidium are good1. oxidizing agents. 2. reducing agents. 3. bases.
1. 4 answers
2. 1,478 views
The reaction2Na+ + 2Cl− ! 2Na + Cl2 is indicative of ? cell; the sign of the anode is ? ; and ? forms at the cathode. 1. an
1. 5 answers
2. 2,901 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. 3 answers
2. 735 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. 4 answers
2. 809 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. 4 answers
2. 1,088 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. 2 answers
2. 845 views
Carbon monoxide reacts with oxygen to formcarbon dioxide by the following reaction: 2CO(g) + O2(g) ! 2CO2(g) �H for this
1. 2 answers
2. 945 views
Which of the following reactions as writtencorresponds to a standard formation reaction? 1. 2H (g) + O2(g) ! H2O2 (`) 2. Na(s) +
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2. 3,835 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. 4 answers
2. 1,534 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. 4 answers
2. 659 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. 4 answers
2. 2,573 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. 1 answer
2. 998 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. 1 answer
2. 897 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. 2 answers
2. 1,071 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. 2 answers
2. 523 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. 4 answers
2. 2,376 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. 3 answers
2. 927 views
At 350 K, Kc = 0.142 for the reaction2BrCl(g) *) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal
1. 2 answers
2. 581 views
The numerical value of the concentrationequilibrium constant for the gaseous reaction 2 SO2 + O2 *) 2 SO3 is 0.5 at temperature
1. 2 answers
2. 1,250 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. 4 answers
2. 2,366 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. 4 answers
2. 760 views