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Questions (64)

Which one of these properties is directly proportional to molality and why?A) Electrical conductance B) Heat of solution C)
1. 0 answers
2. 402 views
I have three questions if you please, can I take protein even if with no any workout? can I take amino acid pills in lower dose
1. 0 answers
2. 554 views
N = Sp.gr*1000* percent% / eq.wtPrepare 200 ml of 5 N H2SO4 solution from concentrated H2SO4 , if we know that Sp.gr = 1.84 g/ml
1. 0 answers
2. 418 views
What is basically difference between the following :1)Internal energy and latent heat 2)Internal energy and potential energy I'm
1. 1 answer
2. 431 views
A piece of ice its mass is 2.5 kg and at 0.0 C temperature , it is crawling on the ground with 5.7 m/s , what is the mass of the
1. 3 answers
2. 646 views
A person hammered a 0.5 kg something (substance ) with a hammer that its weight is 2.5 kg , with the velocity 65 m /s ,, if one
1. 1 answer
2. 486 views
I want to write a CV , could you help and notice me how to do it ?with respects
1. 1 answer
2. 483 views
Are there any tips to help to learn and memorizing the phrasal verbs in english ?With Respects
1. 1 answer
2. 604 views
If we have :H2(g) + 1/2 O2(g) -> H2O(l) dHf= -285.5 Kj N2O5(g) + H2O(l) -> 2HNO3 dHf = -76.6 Kj 1/2 N2 + 3/2 O2 + 1/2 H2 -> HNO3
1. 2 answers
2. 1,128 views
I can't understand rounding rules of numbersCan you simply explain it ?
1. 1 answer
2. 453 views
Does a molecular compound in water have hydration or have ionization ?
1. 1 answer
2. 344 views
How can we prepare or change :1) change unsaturated to saturated soln? 2) change unsaturated to supersaturated? 3) change
1. 0 answers
2. 433 views
Which solute will yield a saturated solution ( in the previous two question ) when we dissolve 36 g of each in 25 g of water at
1. 1 answer
2. 442 views
The solubility of NaNO3 at 40 oC is 102 g/100 g H2O , what is the minimum amount of water to dissolve NaNO3 ( mass of solvent )
1. 2 answers
2. 624 views
The solubility of LiCl is 83.5 g/100 g H2O at 20 oC , and is 89.8 g / 100 g H2O at 40 oC , then what is the required mass (in
1. 2 answers
2. 1,198 views
Why dissolving gases in the liquids is exothermic while the phase is down ? explain please
1. 3 answers
2. 498 views
What is the molality of 22.5 g acetone(CH3)2CO , in 200 g water ? ( the answer is 22.0 m , that I think is wrong .. )
1. 4 answers
2. 599 views
How do the indicators work , by changing color ?
1. 1 answer
2. 476 views
How can we determine the equivalence point ( or end point ) in the curves in titration ( strong acid/weak base and weak
1. 1 answer
2. 712 views
What is difference between equivalence point and end point in the titration ?
1. 1 answer
2. 583 views
What indicator is better in the following titrations :1) strong acid/strong base a) methyl red (4.4 - 6.2 ) b) bromophenol blue
1. 1 answer
2. 514 views
Determine the solvent and solute in the following :a) carat 14 gold b) gaseous drinking ( pepsi for ex.)
1. 2 answers
2. 2,482 views
Classify these mixtures to homogeneous and heterogeneousa) orange juice b) tap water ( home water )
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2. 1,212 views
HF + H2O <==> H3O+ + F-By dissolving 0.03 mol HF in 1 L water , seen that [HF] at the equilibrium is 0.027 M , then : 1) If we
1. 1 answer
2. 548 views
I have trouble how to resist pH in buffer solutions ( in acidic buffer , and in basic buffer ) when we add an acid , and a base
1. 3 answers
2. 597 views
NH3(g) + H2O(l) <==> NH4+ (aq) + OH- (aq)a) According to delta H ( Enthalpy ) , which direction the equation will shift ? b)
1. 4 answers
2. 3,039 views
Determine that which directions ( left or right ) shift , of these following equations according to the Entropy1) HCl (l) <==>
1. 1 answer
2. 402 views
If heat of combustion of acetylene C2H2 is -1301.1 kJ/mol then :a) Write balanced thermochemical equation of acetylene
1. 3 answers
2. 4,703 views
We have this reaction :HCO3- + OH- => CO3^-2 + H2O Specify the conjugate pairs and , which direction the reaction equilibrium
1. 1 answer
2. 2,286 views
We have :Cl | 1) :B-Cl with two unshared electrons | Cl F | 2) :N-F | F then , if we assume that N and B bind covalently , which
1. 1 answer
2. 478 views
Which of the following solutions do they have the maximum osmotic pressure :1) 0.1 m ( molal conc.) glucose 2) 0.1 m sucrose 3)
1. 2 answers
2. 539 views
The solubility of KClO3 in 25 oC is 10 g solute per 100 g waterif 15 g of KClO3 is embedded in 100 g water in 25 oC , then ,
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2. 3,529 views
Dye of iodine is prepared by dissolving in ethanol , and 1% ( one percent ) of this solution contains 10 g of solute in 1000 g
1. 1 answer
2. 773 views
Is these two electrodes appropriate to create a good battery ? :Cd => Cd^+2 + 2e- and Fe => Fe^+2 + 2e- Explain
1. 1 answer
2. 387 views
If a nickel rod embedded in a silver nitrate solution , what do we predict ? explain
1. 1 answer
2. 1,104 views
Assuming that this half cell I2 + 2e- + =>2I- as standard electrode and assumed its potential that is 0.00 V :a) what is
1. 1 answer
2. 530 views
Can a substance made of zinc be coated by nickel , using nickel nitrate solution ? How ?
1. 1 answer
2. 855 views
In electrolysis , which reaction does occur on the cathode , half oxidation reaction or reduction ?
1. 1 answer
2. 718 views
Why can't we use water in electrolytic cell during producing aluminium ?
1. 1 answer
2. 497 views
Why does hydrogen electrode have 0.00 V ? or assumed that has 0.00 V ?
1. 1 answer
2. 459 views
why dry cells are called dry while they contain water ? in electrochemistry
1. 1 answer
2. 954 views
The standard potential of this cellSn|Sn^+2 || Cr^+3|Cr is -0.60 V , what is the reductional standard potential of Cr^+3|Cr ? if
1. 4 answers
2. 741 views
What is the function ( or role ) of platinum in electrochemistry in general ? I read a question about platinum in electric
1. 1 answer
2. 565 views
How many oxidation states Should a substance have at least to undergo Disproportionation reaction ?thanks
1. 1 answer
2. 439 views
A substance contains an element at its probable maximum oxidation number , does this substance have a maximum chance to be an
1. 1 answer
2. 498 views
I have trouble finding out the oxidation number of each element in the :[Cr(N2h4CO)6]4[Cr(CN)6]3
1. 7 answers
2. 1,371 views
I have these equations in our book , but I've tried a few times to solve it in half reaction method , but I couldn't yet :1)
1. 6 answers
2. 1,137 views
Balance the oxidation reduction equation in half reactionPbO2 + KCl => KClO + KPb(OH)3 thank you a lot
1. 3 answers
2. 2,654 views
Why the oxidation number of ( H ) is -1 in1) N2H4 2) CaH2 while ( N ) is different from ( Ca ) ?
1. 4 answers
2. 803 views
In half reaction method of the chemical equation balancing , how about those redox reactions that they don't contain any (H) and
1. 1 answer
2. 524 views
In relative oxidizing and reducing agents table ;1) Is Al oxidized by Ni+2 2) Is Cu oxidized by Ag+ 3) Is Pb oxidized by Na+ 4)
1. 1 answer
2. 650 views
Assume that the ( S ) ( S ; alphabet ) is the solubility in mol/L of AB2 compound , , then what is the concentration of A and B
1. 1 answer
2. 461 views
The Ksp of (hydroxyapatite ) Ca5(PO4)3OH is 6.8 * 10^-37 , and its molar concentration is 2.7 * 10^-5 mol/L ,, if this
1. 1 answer
2. 2,215 views
Does it produce precipitate if 1.7 g of AgNO3 and 14.5 g of NaCl solvated in 200 mL water to get a solution in 25 oC ?thank you
1. 1 answer
2. 726 views
If 2.5 * 10^-2 g of Fe(NO3)3 added to 100mL of 1.0 * 10^-4 M NaOH solution , will it produce precipitate ?thank you
1. 1 answer
2. 455 views
Which conditions ( reactant concentration , pressure , and temperature ) elevate high concentration of the underlines in these
1. 2 answers
2. 517 views
We have this following gas equilibrium :H2 + Cl2 <==> 2HCl + 184 kJ then predict the following to know Le chatlier's prediction
1. 1 answer
2. 856 views
The enthalpy change of an endothermic reaction is 8 kJ , and this reaction is spontaneous at 25 oC ,, what is the expected
1. 1 answer
2. 585 views
Find the specific heat of indium , if any one mole absorbs 23 J , when the temperature elevates from 297.5 K to 299.5 Kthank you
1. 1 answer
2. 445 views
Which of the following is the conjugate acid to a base in these options :1) PO4^-3 2) H2O 3) H3PO4 4) H2PO4^-
1. 1 answer
2. 506 views
Which of the following is the conjugate acid to a base in these options :1) PO4^-3 2) H2O 3) H3PO4 4) H2PO4^-
1. 1 answer
2. 459 views
Which of the following pairs are conjugate pairs ?1) H+ and OH- 2) HCl and Cl- 3) NH2- and NH4+ 4) H2SO4 and SO4^-2 thanks a lot
1. 0 answers
2. 437 views
A) We have an experiment , using the solution of KNO3 , measured freezing point of solution is -1.15 degree , and using a sample
1. 1 answer
2. 1,028 views
The solubility of a substance is 12 g per 100 g water at 20 degree , and is 18 g per 100 g water at 60 degree , what is the mass
1. 2 answers
2. 2,155 views

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