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Questions (20)
In which sentence is the underlined word the SIMPLE PREDICATE?
A. According to legend, there is buried pirate treasure nearby. B.
0 answers
213 views
x^2 - 3x -20
1 answer
98 views
South Africa gained its independence from Britain in 1910. Why did this not lead to freedom and equality in South Africa What
2 answers
569 views
I am trying to calculate geometry optimization of cyclodextrin, however, the computer always show error 2070 in gaussian. I used
0 answers
418 views
the aprroximate method to solve the shrodringer equation for hydrogen like atom?
Please help, thank
1 answer
836 views
please help me to solve it, thank you so much in advance:
propose organic compounds that are isolable with 1.
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576 views
start from the Maxwell-Boltzmann distribution and derive an expression for the most probable speed of a gas of molecules at a
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789 views
Please tell me where I can find the articles ( free) to represent the Setvens rearrangement and Favorskii rearrangement. I have
1 answer
580 views
Ionic bonds and covalent bonds, which one is the stronger. My present teacher said that covalent bond is the strongest one. I
0 answers
742 views
why we have to normalize the proton NMR areas to determine the mole % oa a compound in a mixture?
0 answers
383 views
1.calculate the commutators
a/ [x^2,p^2] b/ [a,a^+n] I don't know how to solve it. Please help. I really appreciate.
0 answers
353 views
Br is larger than Cl,yet the two atoms have identical axial destabilization energies. Why?
0 answers
353 views
What is the chemical formula of fertilizer 13-13-13. Pleas tell me. Thanks a lot
0 answers
383 views
how many milliter of .246 M HNO3 should be added to 213 ml of 0.00666 M 2,2'-bipyridine to give a pH of 4.19?
please help, does
2 answers
1,643 views
Species of arsenic found in kriking water include (AsO3)3-, (CH3)2(AsO2)2-, (CH3)AsO3 2-, and (AsO4)3-. Pure water containing no
1 answer
696 views
6.2(+_ 0.2) - 4.1 (+_ 0.1 ) + ?
[6.2( +_ 0.2) - 4.1(+_ 0.1)] : 9.43(+_0.05) find absolut uncertainty and relative uncertainty.
1 answer
951 views
Why do the molecules that have the structures such as H2C=C=CH2 or HO-CH=CH2 are unstable?
0 answers
546 views
What is the minimum lens size (in meters) that will permit just resolving 2 stars 1.1 second apart using light of 510nm?
3 answers
393 views
Thank you drwls,
My problem is a. The lifetime of the levels in a hydrogen atom are of the order 10-E8s. What is the evergy
1 answer
612 views
the shortest and longest wavelength series in singly ionized helium is 22.8nm and 30.4nm . Are they right?
How many orders we can
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2,015 views
Answers (16)
babyface is correct :) i got 100
mol Na2S = (0.01mol/L)*2.00ml*1L/1000mL = 0.002mol mol Hg(NO3)2 = 50.0ml*(0.0005mol/L)*1L/1000mL = 0.000025=2.5*10^-5 Hg(NO3)2 limiting reagent max mass of precipitate = 2.5*10^-5 * molar mass of Hg(NO3)2
MnO4- +5e -> Mn2+}*2 C+1 -2e -> C+3 }*5 2MnO4- + 5C6H7O +6H+ -> 2Mn2+ + 5C6H7O2 + 3H2O Step 1: realize the oxidation of element: (oxidation of H and O not change) write half reaction equalize the number of election yieled and accepted by the coefficient (
4.6*10^-3 = [NO2]^2/[N2O4] => [NO2] =3.48*10^-1
y' = (3-secx)'tanx -(3-secx)(tanx)'/(tanx)^2 = -secx(tanx)^2 - (3-secx)secx/(tanx)^2 = -secx[(tanx)^2 + (3-secx)]/tan^2x =-[(tan)^2 +3 -secx]/sinx
as t-->0, we have 8t-->0, so lim (sin(8t))^2/t^2 = [lim sin(8t)/t].[limsin(8t)/t] as8t-->0 =8.[limsin(8t)/8t].8[limsin(8t)/8t], 8t-->0 = 8*1*8*1= 64 you know the formula lim (sint/t)=1 as t-->1, aren't you?
let y=0, --> x= 6/5=1.2 let x=0 --> y = 6/3 = 2
deltaG = -RTlnK R=8.314J/mol.K you got R, T so K found by that formula.
They are correct b) (1.2,0) and(0,20
the properties of elements are based on the valence electron, the elements in the same family generally have similar properties because they have the same number of valence electron.
Electronegativity of fluorine is the highest among the chemical element(its electronegativity = 4),so F tends to receive electron, not yield. Therefore, fluorine has the higher ionization energy than iodine.
ionization energy is the minimum energy (Kj/mol)required to remove an wlectron from a gaseous atom in its ground state. affinity energy: the negative of the energy change that occurs when an electron is accepted by an atom in the gaseous state to form an
neon
increasing atomic radius: oxygen
i solved D~11.7*10^-2, but the answer key is .0956
Is D~11.7*10^-2
