Laser_3

a solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution..

a solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution..

...which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10.

A. Assuming that the hydroxide is 1.0 x 10^-2 M, calculate the concentration of Fe2+ ions in the solution.

B. A battery is prepared using th

1234

freddy0622   9535   47 Replies

Kerem Duyar

The Ksp of AgCl is 1.7 10-10. How many moles of MnCl2 can be dissolved in one liter of an aqueous ...

The Ksp of AgCl is 1.7 10-10. How many moles of MnCl2 can be dissolved in one liter of an aqueous ...

[html]The Ksp of AgCl is 1.7 × 10-10. How many moles of MnCl2 can be dissolved in one liter of an aqueous solution in which [AgNO3] = 3.4 × 10-4 M before a precipitate appears?

▸ 5.0 × 10

Zrayzhang   306   3 Replies

Deicy101

Gases in Balloon for Inflation.

Gases in Balloon for Inflation.

Which gases from the periodic table (oxygen, hydrogen, nitrogen, inert gases, nobel gases etc.) can a balloon be filled up?

Thanks & Regards,
Prashant S Akerkar

prashantakerkar   331   8 Replies

prashantakerkar

The scattering of helium atoms by a solid can be used to gain information about the lattice of ...

The scattering of helium atoms by a solid can be used to gain information about the lattice of ...

[html]The scattering of helium atoms by a solid can be used to gain information about the lattice of atoms, provided the wavelength of the helium atoms is comparable to the dimensions of the lattice. What is the wavelength, in picometers, of a helium

CountrySlim84   574   3 Replies

krafty

What is the sign on S for the following reactions?

What is the sign on S for the following reactions?

What is the sign on ${\Delta}$S for the following reactions?
a.   2 C8H18(l) + 25 O2(g)  16 CO2(g) + 18 H2O(g)
b.   NaCl(s)  Na+(aq) + Cl–(aq)
c.   1 N2(g) + 3 H2(g)  2 NH3(g)

mikael   1400   2 Replies

Anonymous

Which of the following is not a unit factor related to a 5.00% aqueous solution

Which of the following is not a unit factor related to a 5.00% aqueous solution

Which of the following is not a unit factor related to a 5.00% aqueous solution of lithium chloride, LiCl?

OldSpice   1867   4 Replies

makala1

The following galvanic cell has a potential of 1.214 V at 25 ∘C: ...

The following galvanic cell has a potential of 1.214 V at 25 ∘C: ...

The following galvanic cell has a potential of 1.214 V at 25 ∘C:
Hg(l)|Hg2Br2(s)|Br−(0.10M)||MnO4−(0.10M),Mn2+(0.10M),H+(0.10M)|Pt(s)
Calculate the value of Ksp for Hg2Br2 at 25 ∘C.

12

pcp98   3115   22 Replies

Trevor Bui1

A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia (Kb for ammonia is 1.8 10-5) and 1.00 ...

A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia (Kb for ammonia is 1.8 10-5) and 1.00 ...

[html]A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia (Kb for ammonia is 1.8 × 10-5) and 1.00 mol of ammonium chloride in water to form a solution with a volume of 1.00 L. To a 200.0 mL aliquot of this solut

makmim3   293   2 Replies

Anonymous

The reactants A and B are mixed, and the reaction is timed until a color change occurs. The data are ...

The reactants A and B are mixed, and the reaction is timed until a color change occurs. The data are ...

[html]The reactants A and B are mixed, and the reaction is timed until a color change occurs. The data are as follows:

Jeffwo   229   3 Replies

zobashaikh

What is the correct molecular geometry for the carbon atom in urea (NH2)2CO?

What is the correct molecular geometry for the carbon atom in urea (NH2)2CO?

What is the correct molecular geometry for the carbon atom in urea (NH2)2CO?

▸ Tetrahedral

▸ T-Shaped

▸ Trigonal planar

▸ Trigonal pyramidal

▸ Trigonal bipyramidal

EliseJasa12   172   3 Replies

rockshim

The nighttime and daytime temperatures on Mercury are 13 K and 683 K respectively. The melting point

The nighttime and daytime temperatures on Mercury are 13 K and 683 K respectively. The melting point

The nighttime and daytime temperatures on Mercury are 13 K and 683 K respectively. The melting point and boiling point of sulfur is 246°F and 832°F. Which of the following statements is true? On Mercury sulfur exists
A) only in the liquid state.

Whelan   504   3 Replies

hbutler2

Electrolysis of 12.6 g of water would produce what volume of O2 gas at 640 torr

Electrolysis of 12.6 g of water would produce what volume of O2 gas at 640 torr

Electrolysis of 12.6 g of water would produce what volume of O2 gas at 640 torr and 22.0 °C?
   2 H2O (l) + electricity   2 H2(g) + O2(g)
A) 101 L
B) 44.8 L
C) 22.4 L
D) 68.4 L

xlr300   1797   7 Replies

bagev24799

How many moles of C are in 1.22 moles of C6H12O6?

How many moles of C are in 1.22 moles of C6H12O6?

How many moles of C are in 1.22 moles of C6H12O6?

▸ 7.32 moles C

▸ 87.9 moles C

▸ 1.22 moles C

▸ 14.7 moles C

▸ 2.44 moles C

inkster   224   3 Replies

ydnam23

A 2.1 L sample of a 0.23 M NaOH solution is mixed with 1.9 L of a 0.021 M KOH solution. What is the ...

A 2.1 L sample of a 0.23 M NaOH solution is mixed with 1.9 L of a 0.021 M KOH solution. What is the ...

A 2.1 L sample of a 0.23 M NaOH solution is mixed with 1.9 L of a 0.021 M KOH solution. What is the pH of the mixture?

▸ 13.40

▸ 13.12

▸ 11.68

▸ 12.84

▸ 13.04

Bluffinmuffin   233   3 Replies

jmoline2

Buffer Lab help+advice?

Buffer Lab help+advice?

[url=https://biology-forums.com/index.php?action=gallery;sa=v

Annonn   1245   11 Replies

poot3

The combustion of hydrogen gas releases 286 kJ per mol of hydrogen. If 0.714 mole of hydrogen was ...

The combustion of hydrogen gas releases 286 kJ per mol of hydrogen. If 0.714 mole of hydrogen was ...

[html]The combustion of hydrogen gas releases 286 kJ per mol of hydrogen.

Jeffwo   560   5 Replies

Hussein Moussa

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.845 g of C

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.845 g of C

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.845 g of CO2 and 1.744 g of H2O. What is the empirical formula of the compound?
A) CH2
B) CH3
C) C4H10
D) C5H2

Whelan   873   5 Replies

David Collins

The explosive, trinitrotoluene, TNT, C6H3N3O6, has the same proportion of:

The explosive, trinitrotoluene, TNT, C6H3N3O6, has the same proportion of:

[html]The explosive, trinitrotoluene, TNT, C6H3N3O6, has the same proportion of:

▸ N to H atoms as does NH3

▸ H to O atoms as does H2O

▸ N to O atoms as does NO2

▸ C t

sarammm   399   3 Replies

jmelchor77

The Cs-131 nuclide has a half-life of 30. years. After 139 years, about 3.0 grams remain. The ...

The Cs-131 nuclide has a half-life of 30. years. After 139 years, about 3.0 grams remain. The ...

[html]The Cs-131 nuclide has a half-life of 30. years. After 139 years, about 3.0 grams remain. The original mass of the Cs-131 sample is closest to


▸ 149 g

▸ 37 g

▸ 74 g

▸ 260 g

▸

jcortese151   838   4 Replies

mossandtoss

The vapor pressures of pure hexane and pure heptane at 25 C are 151.4 mmHg and 45.62 mmHg ...

The vapor pressures of pure hexane and pure heptane at 25 C are 151.4 mmHg and 45.62 mmHg ...

[html]The vapor pressures of pure hexane and pure heptane at 25 °C are 151.4 mmHg and 45.62 mmHg respectively. A solution contains 0.800 mol fraction n-hexane and 0.200 mol fraction n-heptane. What is the composition of the vapor in equ

Cory Yeung   1129   5 Replies

Yujin Wang

For the reaction: 2 N2O5(g) 4 NO2(g) + O2(g) the rate law is: = k[N2O5] At 300 K, the half-life is ...

For the reaction: 2 N2O5(g) 4 NO2(g) + O2(g) the rate law is: = k[N2O5] At 300 K, the half-life is ...

[html]For the reaction: 2 N2O5(g) → 4 NO2(g) + O2(g) the rate law is:

adb005   296   3 Replies

dravid11

For PbCl2 (Ksp = 2.4 104), will a precipitate of PbCl2 form when 0.10 L of 3.0 102 M Pb(NO3)2 is ...

For PbCl2 (Ksp = 2.4 104), will a precipitate of PbCl2 form when 0.10 L of 3.0 102 M Pb(NO3)2 is ...

[html]For PbCl2 (Ksp = 2.4 × 10–4), will a precipitate of PbCl2 form when 0.10 L of 3.0 × 10–2 M Pb(NO3)2 is added to 400 mL of 9.0 × 10–2 M NaCl?

▸ Yes, because

NeuroJuice   272   3 Replies

okayman

If the pressure of 125 cm3 of nitrogen gas at 100 °C decreases from 885 torr to

If the pressure of 125 cm3 of nitrogen gas at 100 °C decreases from 885 torr to

If the pressure of 125 cm3 of nitrogen gas at 100 °C decreases from 885 torr to 225torr, what is the final volume? Assume temperature remains constant.
A) 0.318 cm3
B) 4.92 cm3
C) 31.8 cm3
D) 492 cm3
E) 4590 cm3

OldSpice   1268   4 Replies

Anonymous

Three techniques used to concentrate ores are flotation, ferromagnetic separation, and amalgamation.

Three techniques used to concentrate ores are flotation, ferromagnetic separation, and amalgamation.

[html]Three techniques used to concentrate ores are  flotation,  ferromagnetic separation, and  amalgam

ssi15   231   1 Reply

manuella14

Mercury, magnesium, and zinc have low enough boiling points that they can be purified by distillation.

Mercury, magnesium, and zinc have low enough boiling points that they can be purified by distillation.

[html]Mercury, magnesium, and zinc have low enough boiling points that they can be purified by distillation.

jack bopp   282   1 Reply

sbe0921

In a compound, the oxidation number of an alkali metal is always +1.

In a compound, the oxidation number of an alkali metal is always +1.

[html]In a compound, the oxidation number of an alkali metal is always +1.

▸ true

▸ false[/h

bmwprincess   249   1 Reply

cheezeh3ad

Group 1 elements are called alkaline earth metals.

Group 1 elements are called alkaline earth metals.

Group 1 elements are called alkaline earth metals.

▸ true

▸ false

briemert2013   252   1 Reply

onid

Elements in a group exhibit different properties.

Elements in a group exhibit different properties.

Elements in a group exhibit different properties.

▸ true

▸ false

blinkrb   246   1 Reply

Dratini

Cast iron as it is prepared in a blast furnace is a product of high purity.

Cast iron as it is prepared in a blast furnace is a product of high purity.

[html]Cast iron as it is prepared in a blast furnace is a product of high purity.

▸ tr

SirJohnny   260   1 Reply

eap8

Beryllium, the first element in Group 2A, is the most metallic element in the group.

Beryllium, the first element in Group 2A, is the most metallic element in the group.

[html]Beryllium, the first element in Group 2A, is the most metallic element in the group.

▸

Jgal   242   1 Reply

OCboba

Bauxite (Al2O3 2H2O) ore is the commercial source of aluminum metal.

Bauxite (Al2O3 2H2O) ore is the commercial source of aluminum metal.

[html]Bauxite (Al2O3 • 2H2O) ore is the commercial source of aluminum metal.

omaralnatour   218   1 Reply

jmoline2

Aluminum chloride exist as a dimer.

Aluminum chloride exist as a dimer.

Aluminum chloride exist as a dimer.

▸ true

▸ false

karotop02   219   1 Reply

jarste123

Alkali metals are the most electronegative metals in the periodic table.

Alkali metals are the most electronegative metals in the periodic table.

[html]Alkali metals are the most electronegative metals in the periodic table.

▸ true

▸ fals

FallenOne   223   1 Reply

crusherpsg

Al(OH)3, Be(OH)2, and water are all amphoteric.

Al(OH)3, Be(OH)2, and water are all amphoteric.

[html]Al(OH)3, Be(OH)2, and water are all amphoteric.

▸ true

▸ false[/

cyberk   220   1 Reply

mr.pogi

A metal crystal consisting of 1 1020 atoms has 0.5 1020 bonding orbitals and 0.5 1020 antibonding ...

A metal crystal consisting of 1 1020 atoms has 0.5 1020 bonding orbitals and 0.5 1020 antibonding ...

[html]A metal crystal consisting of 1 × 1020 atoms has 0.5 × 1020 bonding orbit

duo21   178   1 Reply

chemcal

A fractional distillation method called the Mond process is used to purify nickel.

A fractional distillation method called the Mond process is used to purify nickel.

[html]A fractional distillation method called the Mond process is used to purify nickel.

▸ tr

RHCP12   208   1 Reply

ramos1992

Which undergoes electrolysis to form calcium metal?

Which undergoes electrolysis to form calcium metal?

[html]Which undergoes electrolysis to form calcium metal?

▸ Ca(OH)2

▸ Ca(NO

theroyalty   186   1 Reply

bcyber

Which two compounds are produced by the Solvay process?

Which two compounds are produced by the Solvay process?

[html]Which two compounds are produced by the Solvay process?

▸ CaCO3 and CaO

▸

Heybonita   203   1 Reply

julie5

Which statement is correct?

Which statement is correct?

[html]Which statement is correct?

▸ A. magnesium hydroxide can act as an acid.

▸ B

devildoc   149   1 Reply

ydnam23

Which statement is not correct?

Which statement is not correct?

[html]Which statement is  not correct?

▸ Aluminum has a low density versus other metal

shahabkhon   143   1 Reply

avi420