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chemistry

Questions (46)

MnO4–(aq) + Cl–(aq) MnO2(s) + Cl2(g) (unbalanced)i. Balance the given half-reactions for atoms and charge. (0.5 points)
1. 1 answer
2. 150 views
write a balanced equation for the reaction : if 40cm3 of Carbon (2) oxide were mixed with 30cm3 of oxygen : calculate the volume
1. 1 answer
2. 431 views
Calculate the composition of dry air at 3800 K and 1 bar. Take the initial composition as 0.78 mol N2, 0.21 mol O2, and 0.01 mol
1. 0 answers
2. 355 views
what would be the e configuration for sodium- 23 (up and down arrows)1s- ? arrows 2s- ? arrows 2p- ? arrows 3s- ? arrows 3p- ?
1. 1 answer
2. 418 views
How much heat is required to take 4 kg of water from 20◦C to near boiling at 99◦C?Answer in units of J. I got 1320.88?
1. 3 answers
2. 1,288 views
ammonia is produced from the reaction of nitrogen and hydrogen according to the following balanced equation.N2+3H2g----- >
1. 2 answers
2. 2,089 views
1:when 20.0ml of 1.7m AgN03 added to grammar of AgCL will be produced?2:if the percentage yield is 30%,calculate the actual
1. 1 answer
2. 454 views
what is the source of activation energy in an exothermic reaction?Is an example heat?
1. 1 answer
2. 402 views
CH3-C(triple bond)C-CH-(C2H5)CH3product a and product b
1. 0 answers
2. 396 views
CH3-C(triple bond)C-CH-C2H5-CH3product a and product b
1. 0 answers
2. 447 views
How match water make in 0.123 N NaoH for 0.1 N NaoH
1. 1 answer
2. 346 views
what is a solubility rate?
1. 1 answer
2. 315 views
A solution contains 2.0 × 10^–3 M Ba^2+ and 1.0 × 10^–2 M Sc^3+. A source of F^– is slowly added to the solution. Will
1. 1 answer
2. 442 views
A sample of toluene, C7H8 has a mass of 74.5 g.a) how many molecules does the sample contain? b) How many carbon atoms does it
1. 2 answers
2. 861 views
1. lactate has a molecular weight of 90.08. How much lactate is needed to make 3 liters of .15 molar lactate.2.What is the
1. 1 answer
2. 426 views
write raction of benzoic acid with propylamine
1. 1 answer
2. 347 views
How will you prepare potassium per magnate.
1. 1 answer
2. 1,001 views
Alexandra decides to climb Mt. Krumpett, which is 5000 high. She determines that this will require a total of 3600 of energy for
1. 2 answers
2. 2,016 views
how to identify bond angles
1. 3 answers
2. 658 views
is LiCl toxic?
1. 4 answers
2. 428 views
what are some good compounds(salts, acids,/bases) that are good conductors when dissolved in h2o
1. 4 answers
2. 401 views
out of the pairs of orbitals which has a higher amount of energy4f or 6s
1. 1 answer
2. 363 views
why is it that when an unknown carbonate of group one or two (inc H) reacting w/ HCl, the mole ratio is 1:1
1. 3 answers
2. 319 views
the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide
1. 1 answer
2. 1,000 views
A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0°C,is burned in excess oxygen, liberating 4.24
1. 0 answers
2. 1,391 views
What is the major product of the reaction between methanol and (2R,3S)-2-bromo-3-methylpentane at room temperature?
1. 0 answers
2. 1,126 views
what would be a diagram that we can use to idenitify an unknown substance using electrochemical data.we have a reduction table
1. 0 answers
2. 429 views
Excess fluorine, F2(g), reacts at 150°C with bromine, Br2(g), to give a compound BrFn. If 423 mL Br2(g) at 150°C and 748 mmHg
1. 1 answer
2. 1,605 views
A molecular compound is composed of 58.8% Xe, 7.2% O, and 34.0% F, by mass. If the molecular weight is 223 g/mol, what is the
1. 2 answers
2. 1,242 views
A gaseous compound has the following composition by mass: C, 25.0%; H, 2.1%; F, 39.6%; O, 33.3%. Its molecular weight is 48
1. 1 answer
2. 888 views
An ionic compound has the following composition (by mass): Mg, 10.9%; Cl, 31.8%; O, 57.3%. What is the formula and name of this
1. 1 answer
2. 594 views
Consider the hypothetical elements X and Y. Suppose the enthalpy of formation for the compound XY is ƒ{336 kJ/mol, the bond
1. 1 answer
2. 809 views
What is the lattice energy of NaBr?heat of formation of NaBr = -362 kJ/mol heat of sublimation for Na = 107.30 kJ/mol ionization
1. 2 answers
2. 4,524 views
Given the reaction 3C(s) + 4H2(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) ÄH= -2323.7 kJHow much heat would be released when 34.1 g of
1. 3 answers
2. 654 views
what did i do wrong?i need to find lowest vapor pressure. a 0.13 m FeCl3 b 0.50 m sucrose c 0.24 m NaNO3 d 0.15 m Na2PO4 so i
1. 1 answer
2. 432 views
What is the boiling point in K of Zn, if the entropy change for evaporation of .8564 mole at its boiling ponit is 95.067K? The
1. 0 answers
2. 473 views
The free energy change for dissolution of CaSO4 at 25C is 28.774kJ/mole. What is the solubility of this compound.i got ksp lnK =
1. 3 answers
2. 567 views
suppose a compound could point in any of the three directions in the solid and still have the same energy. how many molecules
1. 0 answers
2. 528 views
calculate [H+] if [OH] is 1.688x10^-3
1. 1 answer
2. 354 views
CH3CH3-C-CH3 CH3CH2CH2-C-CH2CH2CH2CH3 CH3 give the IUPAc name for this compound? is it 4-methyl-4-tert-methyloctane?
1. 1 answer
2. 1,299 views
What is the difference between Keq and the term of [prod]pr / [react]pr?
1. 1 answer
2. 403 views
a gaseous hydrocarbon reacts completely with oxygen gas to form carbon dioxide and water vapor. given the following data,
1. 1 answer
2. 1,052 views
how does cross linking alter the properties of a polymer?
1. 1 answer
2. 470 views
I understand that polymers are long chain 500-20,000 repeating units, but I don't know:what car components are made of polymers?
1. 1 answer
2. 477 views
The mole fraction of acetic acid (CH3COOH) in an aqueous solution is 0.675. Calculate the molarity of the acetic acid, if the
1. 1 answer
2. 830 views
what does an atom of lead look like? what are the parts that compose of the atom?help me pls
1. 1 answer
2. 477 views

Answers (30)

what is the volume of oxygen at s t p will be obtained when 24.5g of potassium trioxochlorite
A is a solution of trioxonitrate (v)acid, HNO3 of unknown concentration.B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25 cm3 portion solution B required an average of 24.00cm3 of solution A for neutralization using 2drops
result
I put this answer into my homework and got it wrong
4.18 x 4kg x (99-20)
Answer
CH4 is the limiting reactant
A. 8.75a + 6.5c + 6.5s = total cost. B. 8.75(2) + 6.5(3) + 6.5(4) = answer C. 8.75(4) + 6.5(2) = answer Just compare the totals to see if they are the same
So would i multiply 4.86 x 10^23 by 7 to get the number of carbon atoms And multiply by 8 to get the number of hydrogen atoms
thx but wat is a good way to remember it
ok, thanks
could i use it safely at home
where can I access this? and are they all good conductors
any more other than these that can be easily accessed
Not just Na I mean all group 1 and 2 elements
re write the question properly sec^2 x? is there something there? there should be either x or thetha there and is it multplied
6y+-4x + y -x 7y -5x
-3,-2,4 use the number line
x=-2/3
randy re check the question and use brackets to identify do u mean secant squared? or secant to the power of 2x-1
factor out 5 u get 5(4x^2+8x +3) = 0 5(4x^2+2x+6x+3)=0 5(2x(2x+1)+3(2x+1))=0 5(2x+1)(2x+3)=0 x=-1/2 or x=-3/2
7z + 5 = 21 7z=21-5 7z=16 z=16/7
it worked now, thank you!
9904.7 is the answer but I already tried that and its not working
im getting 1.54e-6
thanks for the help but im still not getting the right answer
discuss the kinetic theory of gases and proof that the equation pv =1/3 mv2
how can you fill a flask with pure oxygen without mixing it with air
i get how you get X = 2.077*Y, but i don't understand how if you plug in 0.481X in for Y to solve for x. x = 2.077(0.481x) x = 0.999x then what??? i know this is probably a simple stupid math question, but i need to do another problem like this and i'm
Thank you DrBob222! I got it now!

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