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cheri
Questions and answers by visitors named
cheri
Questions (129)
Which response includes all of the following
LiOH, KOH, Ni(OH)2, Mg(OH)2, Ca(OH)2 that are insoluble bases, and no others? 1.
5 answers
3,002 views
Which of
I) HCl II) HF III) LiOH IV) HClO2 V) HNO3 are strong acids or strong bases in water?
6 answers
2,320 views
If 300 mL of 3.9 molar HCl solution is added
to 200 mL of 2.2 molar NaOH solution, what will be the molarity of NaCl in the
4 answers
849 views
If you analyzed each of the substances
NaBr, KOH, CrPO4, Pb(OH)2, RbCl, LiNO3 by mixing them with water in a beaker, which
6 answers
3,838 views
What types of intermolecular interactions
does chloroform (CH3Cl) exhibit? I) London dispersion II) dipole-dipole III) hydrogen
4 answers
2,634 views
What pressure would a mixture of 3.2 grams
of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 5.1
7 answers
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
4 answers
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 answer
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 answer
391 views
What number am I
My tens digit is double my ones digit. I am less than 70 greater than 60? How do u figure this out need help to
6 answers
226 views
An electronics store receives a shipment of 20 graphing calculators, including 3 that are defective. Four of the calculators are
5 answers
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 answer
327 views
5-(4y+5)=3+2(4y-6)
how do i combine like terms and what do i do with these()?
3 answers
333 views
If a metal ore contains 21.9% pure metal, how
many pounds of pure metal can be obtained from 68 pounds of metal ore? Answer in
2 answers
494 views
A 25.2 g of iron ore is treated as follows. The
iron in the sample is all converted by a series of chemical reactions to Fe2O3.
3 answers
1,125 views
An ore contains Fe3O4 and no other iron. The
iron in a 54.6-gram sample of the ore is all converted by a series of chemical
3 answers
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 answer
466 views
Sulfuric acid (H2SO4) is prepared commer-
cially from elemental sulfur using the contact process. In a typical sequence of
2 answers
1,182 views
In the reaction below, 22 g of H2S with excess
O2 produced 10 g of sulfur. ?H2S + ?O2 ! ? S + ?H2O. What is the percent yield of
4 answers
1,368 views
The reaction of 9.5 grams of fluorine with
excess chlorine produced 5.9 grams of ClF3. What percent yield of ClF3 was obtained?
3 answers
1,177 views
Sulfuric acid (H2SO4) is prepared commer-
cially from elemental sulfur using the contact process. In a typical sequence of
2 answers
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 answer
389 views
What volume of 6.58 M HNO3 is required to
prepare 671 mL of a 2.7 M HNO3 solution?
1 answer
378 views
What mass of MgSO4 · 7H2O is required to
prepare 300 mL of a 0.61 M MgSO4 solution? Answer in units of g
3 answers
2,686 views
What volume of 6.58 M HNO3 is required to
prepare 671 mL of a 2.7 M HNO3 solution? Answer in units of mL
2 answers
491 views
It takes 62 mL of 0.124 M KOH to neutralize
46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in
2 answers
1,109 views
How many milliliters of 5.5 M HCl must be
transfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of
4 answers
655 views
Sulfuric acid (H2SO4) is a very strong diprotic
acid. If 0.062 moles of sulfuric acid is mixed with water to make 200 mililiter
2 answers
1,038 views
We have an aqueous solution that contains
47% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 209
4 answers
735 views
When 0.025 moles of aluminum sulfate are
dissolved in enough water to make 115 milliliters of solution, what is the molarity of
3 answers
2,428 views
Calculate the molality of CsCl in a 19% by
mass aqueous solution.
3 answers
741 views
It takes 62 mL of 0.124 M KOH to neutralize
46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in
2 answers
779 views
What mass of MgSO4 · 7H2O is required to
prepare 300 mL of a 0.61 M MgSO4 solution? Answer in units of g
2 answers
684 views
How many milliliters of 5.5 M HCl must be
transfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of
1 answer
427 views
Calculate the molality of acetone in an
aqueous solution with a mole fraction for ace- tone of 0.171. Answer in units of m
2 answers
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
4 answers
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
4 answers
992 views
A sample of 7.45 grams of NaOH is dissolved
into 609 mL of aqueous 0.250 M NaOH (as-sume no volume change). This solution is then
4 answers
1,696 views
How many milliliters of a 0.16 M HCl solution
are needed to react completely with 4.8 g of zinc to form zinc(II) chloride? Answer
1 answer
451 views
What volume of 0.402MK3PO4 is required to
react with 43 mL of 0.507 M MgCl2 according to the equation 2K3PO4 + 3MgCl2 ! Mg3(PO4)2
1 answer
361 views
Silver nitrate (AgNO3) reacts with sodium
chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . How many grams of
3 answers
850 views
How many milliliters of a 0.5 molar HCl
solution are needed to react completely with 11 grams of zinc according to the following
2 answers
574 views
We add excess NaCl solution (58.44 g/mol) to
56 mL of a solution of silver nitrate (AgNO3 169.88 g/mol), to form insoluble solid
2 answers
747 views
We add excess Na2CrO4 solution to 27.0 mL
of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has
3 answers
553 views
A solution of sodium hydroxide is standard-
ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the
1 answer
431 views
Listerine mouthwash is 21.6%ethyl alcohol by
volume. What mass of ethanol is contained in 20.0 mL of mouthwash? (The density of
2 answers
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
3 answers
461 views
In choosing a primary standard we generally
choose something that 1. All of these are properties we want in a primary standard.
4 answers
1,825 views
An unknown amount of water is mixed with
350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is
2 answers
537 views
What volume of water was added to the 350
mL of NaOH solution? Assume volumes are additive. Answer in units of mL
4 answers
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
5 answers
2,057 views
Consider the following reaction
CaCl2(aq) + 2Ag2SO4(aq) ! CaSO4(?) + 2AgCl(?) .Which of the following statements is true? 1. Both
5 answers
1,961 views
Which of the following aqueous solutions
should form a precipitate with aqueous Fe(NO3)3? 1. KNO3 2. KCl 3. K2SO4 4. KOH
4 answers
7,996 views
Which of the following aqueous solutions
should NOT form a precipitate with aque- ous Ba(NO3)2? 1. K3PO4 2. K2SO4 3. K2CO3 4. KOH
5 answers
2,539 views
Although soluble barium compounds are
toxic, suspensions of insoluble barium sul- fate are routinely swallowed for upper gas-
2 answers
514 views
Which one of the following substances is
LEAST soluble in water? 1. BaCO3 2. KSCN 3. Na3PO4 4. RbOH 5. LiBr
4 answers
2,895 views
Which of the species
KClO2, NH4Br, HNO2, PbS is/are insoluble in water? 1. NH4Br and NH3 2. KClO3 3. PbS 4. HNO2 5. All of these
4 answers
2,087 views
Suppose that you wanted to be sure that a
metal ion, any metal ion, would dissolve in water. What salt of the metal ion compound
5 answers
asked by
cheri
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
4 answers
1,076 views
HBr is mixed with water. Which is the best
description of what you would expect to find in the solution? 1. Br1−, OH1−, and
2 answers
724 views
HCN is mixed with water. Which is the best
description of what you would expect to find in the solution? 1. CN+, OH−, and water
4 answers
1,345 views
Which compound on the left, when dissolved
in water, does not produce the corresponding compound(s) on the right? 1. CaO !
1 answer
444 views
An excess of aqueous AgNO3 reacts with
44.5 mL of 5 M K2CrO4(aq) to form a precip- itate. What is the precipitate? 1. K2CrO4 2.
3 answers
1,124 views
An excess of aqueous AgNO3 reacts with
44.5 mL of 5 M K2CrO4(aq) to form a precip- itate. What is the precipitate? 1. K2CrO4 2.
3 answers
954 views
A volume of equimolar strong acid like HCl
is mixed with an equal volume of equimolar strong base like NaOH in a beaker of water.
2 answers
1,278 views
If aqueous hydrofluoric acid is reacted with
sodium hydroxide, which of the following sub- stances are in the net ionic equation?
2 answers
623 views
Which of the following is best described as an
acid-base reaction? 1. NaCl + AgNO3 !NaNO3 + AgCl 2. NH3 + H2O ! NH+ 4 + OH− 3.
2 answers
735 views
The net ionic equation for ALL aqueous reac-tion of strong acids and strong soluble bases
that form soluble salts is 1. the
3 answers
863 views
Identify the type of reaction
C4H10(g) + O2(g) ! CO2(g) + H2O(g) 1. hydrocarbon synthesis 2. single displacement 3. incomplete
3 answers
3,685 views
Classify the reaction
(NH4)2Cr2O7 ! N2 + 4 H2O + Cr2O3 as one or more of the following: Z1) combination Z4) metathesis Z2)
4 answers
2,349 views
Which of the following metals or nonmetals
are expected to displace Mn or Cl (respec- tively) from MnCl2? 1. Cu should displace
2 answers
527 views
A ruptured tank in Anywhere, USA, spilled
hydrochloric acid. Officials were reported to be concerned that the acid might mix with
3 answers
1,066 views
Very small mercury batteries have been made
and used in a multitude of applications. Why have they been replaced by other kinds
2 answers
691 views
A battery has two electrodes labeled anode
and cathode. Electrons flow from the (anode, cathode) to the (anode, cathode) through
2 answers
755 views
In a voltaic cell, electrons flow from the ?
to the ? in the external circuit. 1. cathode; anode 2. products; reactants 3. anode;
2 answers
914 views
Chlorine, bromine, and iodine are good
1. oxidizing agents. 2. reducing agents. 3. bases.
3 answers
1,244 views
For an electrochemical reduction process,
electrons are 1. taken from solution species at the surface of the cathode. 2. added to
2 answers
938 views
What is a poor conductor of electricity?
1. mercury 2. molten NaCl 3. copper 4. potassium 5. sulfur
3 answers
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
3 answers
1,597 views
Sodium, potassium, and rubidium are good
1. oxidizing agents. 2. reducing agents. 3. bases.
4 answers
1,478 views
The reaction
2Na+ + 2Cl− ! 2Na + Cl2 is indicative of ? cell; the sign of the anode is ? ; and ? forms at the cathode. 1. an
5 answers
2,901 views
Consider the reaction
2 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
3 answers
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,
4 answers
809 views
Consider the reaction
2 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
4 answers
1,088 views
Calculate the standard reaction enthalpy for
the reaction NO2(g) ! NO(g) + O(g) Given: O2(g) ! 2O(g) �H� = +498.4 kJ/mol NO(g) +
2 answers
845 views
Carbon monoxide reacts with oxygen to form
carbon dioxide by the following reaction: 2CO(g) + O2(g) ! 2CO2(g) �H for this
2 answers
945 views
Which of the following reactions as written
corresponds to a standard formation reaction? 1. 2H (g) + O2(g) ! H2O2 (`) 2. Na(s) +
5 answers
3,835 views
The energy change �H associated with the
reaction NBr3(g) + 3H2O(g) ! 3HOBr(g) + NH3(g)is +81 kJ/mol rxn. These bond energy
4 answers
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
4 answers
659 views
How much heat is released if 2.00 moles
CF2Cl2 reacts with 70.0 g F2 with a 75.0 percent yield? CF2Cl2 + F2 ! CF4 + Cl2 �H for
4 answers
2,573 views
A sample of gas in a cylinder of volume 4.09 L
at 289 K and 3.43 atm expands to 7.73 L by two different pathways. Path A is an
1 answer
998 views
1.95 mol of an ideal gas at 300 K and 3.00
atm expands from 16 L to 28 L and a final pressure of 1.20 atm in two steps: (1) the
1 answer
897 views
What is the value of w (work) when 1.3 moles
of H2 expands from 25 liters to 50 liters against a constant external pressure of 1
2 answers
1,071 views
How much work is done by the system when
2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 8.1 liters against a
2 answers
523 views
Consider the reaction
Ni(s) + 4CO(g) ! Ni(CO)4(g) Assuming the gases are ideal, calculate the work done on the system at a
4 answers
2,376 views
At a certain temperature, the equilibrium
constant Kc is 0.154 for the reaction 2 SO2(g) + O2(g) *) 2 SO3(g) What concentration
3 answers
927 views
At 350 K, Kc = 0.142 for the reaction
2BrCl(g) *) Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal
2 answers
581 views
The numerical value of the concentration
equilibrium constant for the gaseous reaction 2 SO2 + O2 *) 2 SO3 is 0.5 at temperature
2 answers
1,250 views
The system
CO2(g) + H2(g) *) H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00
4 answers
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
4 answers
760 views
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