Friday
July 25, 2014

Posts by GK


Total # Posts: 644

Science/Chemistry
The reaction is: Zn(OH)2 + 2HBr ---> ZnBr2 + 2H2O This reaction shows that moles of HBr = (1/2) moles of HBr. Moles of HBr = (liters)(moles/L) or moles HBr = (0.500 L)(0.50 mol/L) = _____? moles of ZnBr2 = (1/2) moles of HBr Multiply the moles of ZnBr2 by its formula mass t...

CHEMISTRY
1. Divide 8.37x10^25 molecules of N2O4 by the number in 1 mole which is 6.02x10^23 molecules/mole. This will give you the number of moles. 2. Find the formula mass of N2O4 3. Multiply the number of moles by the formula mass to get the number of grams of N2O4

CHEMISTRY
1. Find the formula mass of FePO4 2. Divide the mass of FePO4 (285g) by the formula mass. That will give you the number of formula units or moles of FePO4

Chemistry
Your Lewis structure for BrO3^- should be trigonal planar with a double bond between the central Br atom and one of the O's. Since the double bond could be with anyone of the O's, you can draw three different resonant structures. ClO4^- is tetrahedral with only one sta...

Chemistry
MgO is 60.3% Mg. Mg3N2 is about 72% Mg Mg3N2 with water added changes to Mg(OH)2 which is then is changed to MgO upon heating. For a small sample, the overall weight changes are quite small. You would need very precise lab results to make accurate calculations of the % of Mg3N...

CHEMISTRY
Addendum: This is an example of a Hess's Law problem. Your textbook should have some solved examples. Here is one solved example online: http://answers.yahoo.com/question/index?qid=20080514171625AAsqOoC

CHEMISTRY
REWRITE the three reactions and their ∆H's (a) Reverse the 1st reaction and change the algebraic sign of its ∆H (b) Leave the 2nd reaction and its ∆H unchanged. (c) Double the 3rd reaction (multiply all its coefficients by 2). Double its ∆H, also. (...

Chemistry
(a) First find the transition energy from the frequency by using the Planck equation: deltaE = (6.63x10^-34Js)(frequency) (b) Use the equation below: deltaE = (-2.18x10^-18J)(1/b^2 - 1/a^2) a and b are small integers with b>a Calculate deltaE using trial values for b and a ...

chemistry
In the initial first order reaction, rate = k[substrate concentration] As time passes the enzyme becomes bound with substrate into an enzyme-substrate complex. At this point the rate of product formation depends on the rate of decomposition of the complex and independent of su...

history/chem
Both, Aristotle and Plato believed that matter could be subdivided indefinitely into smaller and smaller parts. In other words, they did not believe in indivisible units or atoms. Their contribution to chemistry was that they thought about, and discussed the ultimate structure...

Chemistry
Consider the following: *When you dissolve NaCl in water, the mixture cools indicating an endothermic change. It leads to products with higher enthalpy. *NaCl crystals are highly orderly structures which means that their entropy is low. As they dissolve in water they dissociat...

chemistry
10.8 million gal=1.08x10^7 gal (1.08x10^7 gal)(3.78 dm^3/gal) = 4.08x10^7 dm^3 0.5 mm /100 mm/dm = 0.005 dm V = Ah, where h is the film thickness. 4.08x10^7 dm^3 = A(0.005 dm) (A = area of spill) A = 8.16x10^9 dm^2 1 m^2 = 100 dm^2 A = 8.16x10^7 m^2 1 mile^2 = (1609m)^2= 2.59x...

Chemistry
This question has been answered already

Chemistry
Is it 1.2 L and 3.0 L ? If so, 1.2 L / 3 breaths = 0.4 L / breath (3.00 L) / (0.4 L / breath) = 7.5 breaths (7.5 breaths)(0.060 mol/breath) = 0.45moles

Chemistry
The simplified reaction is: C5H11O5-CHO + 2Cu^2+(aq) —> C5H11O5-COOH + Cu2O(s) + H2O The aldehyde group,-CHO, in the ketohexose (such as glucose, galactose, etc) oxidizes to a carboxyl group, -COOH. That releases electrons which reduce Cu+2 to Cu^+1 (blue cupric citrat...

AP Chemistry
Clarification: In the last step multiply the three numbers in the mole ratio by the same number. Select the smallest multiplier that will give a three whole number ratio. Tose three numbers are your subscripts.

AP Chemistry
(a) Convert the grams of CO2 to moles of CO2 by dividing grams of CO2 by the molar mass of CO2. Moles of CO2 = moles of carbon, C. Multiply moles of C by 12.011g/mol to get grams of carbon in the sample. (b) Find the moles of H2O in a similar way. Moles of H = (2)(moles of H2O...

Chemistry
Percent error is calculated by dividing the value of the error by the accepted value and then multiplying by 100.

chemistry
Name any two elements form the extreme left column of the periodic table.

college chemistry
The density of Cu is 8.96 g/cm^3. The density of Pb is 11.4 g/cm^3. Let the mass fraction of copper, Cu = x, Then the mass fraction of Pb is (1-x). The algebraic expression for the "weighted" average density is: 8.96x + 11.4(1-x) = 9.60 Solve for x to get the mass fr...

chemistry
The atoms and molecules making up any material are in constant motion. The amount of molecular motion depends on the temperature.

Chemistry
Correction: (b) If you divide grams by moles you get grams/mole, the molar mass. Comment: No web page makes a good substitute for your chemistry class and your chemistry textbook.

Chemistry
(a) Multiply the number of moles by 6.02x10^23 atoms/ mole. (b) If you divide grams by moles you get grams/mole, the atomic mass.

physics
The initial vertical component of the velocity is: Vyo = (35.5m/s)(sin49.9) = _____ m/s The vertical distance can be described by: y = (Vyo)t + (1/2)(-9.8m/s^2)t^2 At the time the ball was caught: 0.877m = (Vyo)t + (1/2)(-9.8m/s^2)t^2 Substitute the value for Vyo and rearrange...

Chemistry 2 Ap
Same suggestion as the previous one. Divide the grams of CaCO3 but the molar mass of CaCO3.

Chemistry 2 Ap
Find the mass of 1 mole of CaCO3. Divide the grams of CaCO3 by its molar mass.

physics
Correction to the previous answer: "The height above the ground of the glasses is: 32.0m - (1/2)g(t-2)^2" should read: The height above the ground of the pen is: 32.0m - (1/2)g(t-2)^2

physics
Find the time of fall by using: y = (1/2)gt^2 (y is given and g = 9.8m/s^2, Solve for t) When the glasses hit the ground, the pen has been falling for (t-2.00s). The height above the ground of the glasses is: 32.0m - (1/2)g(t-2)^2

Chemistry
AgI precipitates first because it has lower Ksp and lower solubility: Ksp =[ Ag+][I-] = 1.5x10^-16 [0.010][I-] = 1.5x10^-16 [I-] = 1.5x10^-14 when AgI begins to precipitate. Ksp = [Cu+][i-] = 5.3x10^-12 for CuI [0.010][I-] = 5.3x10^-12 [I-] = ?___ when CuI begins to precipita...

Physics
(a) accelerating upward with an acceleration of 1.10 m/s2, F(net) = F(up) + F(down) ma = Fup + Fg (74.0kg)(1.10m/s^2) = Fup + (74.0kg)(-9.8m/s^2) Find Fup to get the scale reading (The scale reading is the value of the upward force of the spring inside the scale) (b) moving ...

Chemistry
The answer to what question is 200? •If the question is to find the % by mass, then (50.0mL)(1.00g/mL) = 50.0g H2O, and mass% = (100)[10.0g / (10.0g + 50.0g)] = 16.67% •If the question is to find the grams/liter, then [(10.0g)/(50.0mL)](1000mL/L) = 200 g/L •If ...

physics
Use Coulomb's Law: F = k*Q1*Q2 / r^2 k = 9.00x10^9 N.m^2/C^2 (Coulomb's constant) Q1 = Q2 = 1.60x10^-19C (Elementary charge) r = given in the question (distance) Note: The charge of a proton is equal to the charge of an electron except for the algebraic sign.

AP Chemistry
107.870 + 79.909 = 187.779 %Ag = [(107.870 / 187.779](100) = 57.4452% %Br = [(79.909/187.779)](100) = 42.5548% (13.2160 g AgBr)(0.42.5548) = 5.624g Br in AgBr [(5.624g Br)/(12.5843g ZrBr4)](100) = 44.691% Br in ZrBr4 100.000 - 44.691 = 55.309% Zr in ZrBr4 Let the atomic mass ...

Chemistry
The balanced chemical equation is: 2MnO4^-(aq) + 16H^+(aq) + 5C2O4^-2 ---> 2Mn^+2 + 8H2O + 10CO2 46.88mL - 11.23mL = 35.65mL MnO4- solution •Moles of MnO4^- = (0.03565L)(0.201mol/L)

Chemistry 2 AP
The chemical equation is: (NH4)2Cr2O7 --> Cr2O3 + N2 + 4H2O •Find the mass of 1 mole of (NH4)2Cr2O7. •Divide 10.8g (NH4)2Cr2O7 by the mass of 1 mole to get the number of moles. •The number of moles of N2 and of Cr2O3 are the same as the number of moles of (NH...

Chemistry
Balancing oxidation-reduction (redox) reaction is a complex process. You must know how to assign some oxidation numbers and how to calculate others no matter which method you use. The best method in my opinion is the “Ion-Electron” method. This is not a lesson on ho...

Chemistry
Correction: "Be/BeH2 = (1.008)(2)/11.03 = 0.1828 = 18.28% H." should read: 2H/BeH2 = (1.008)(2)/11.03 = 0.1828 = 18.28% H.

Chemistry
Hydrogen has the lowest atomic mass. That would make the % of hydrogen in most hydrides very low since the H atoms would be linked to much heavier atoms. The two percents given are actually high indicating that the hydrides are linked to a relatively small atom, possibly from ...

Chemistry
•(0.03644L)(0.013 mol/L) = 4.7372x10^-4 mol Fe+3 •(4.7372x10^-4 mol Fe+3)(1 mol H2C2O4 / 2 mol Fe+3) = 2.37x10^-4 mol H2C2O4 •Find the molar mass of H2C2O4 and multiply by the moles of H2C2O4 to get the mass in grams. The mass of H2C2O4 over the mass of the samp...

Chemistry
I think it was 35 mL of 0.1M AgNO3, not AgCl. When the two solutions are mixed the reaction is: 2AgNO3(aq) + MgCl2(aq) ---> AgCl(s) + Mg(NO3)2(aq) Moles of AgNO3 = (0.035L)(0.1mol/L) = 0.0035 moles of AgNO3. Moles of Ag+ ion = 0.0035 also. Likewise, moles of MgCl2 = (0.015 ...

chemistry (buffers)
Buffers are combinations of a weak acid and a weak base, not a weak acid and a strong base.

Physics
(a) distance = speed x time or time = distance/speed The two times can be found by dividing the distance by each speed. Subtract the two times. (b) Let t = time it takes the slower student. 5.50 min = 330 s The distance is 0.90t = 1.90(t-330) Solve for t, then substitute into ...

chemistry
aspirin (acetylsalicylic acid), vitamin C (ascorbic acid) and vitamin B-12 (folic acid) are acids. Aluminum hydroxide, magnesium hydroxide and calcium carbonate are bases used as stomach antacids. Magnesium citrate (laxative), ferrous sulfate (iron supplement), morphine sulfat...

chemistry
Set 1 varies from 1.374 to 1.400, a range of 0.026 Set 2 varies from 1.347 to 1.401, a range of 0.054 Set 3 varies from 1.301 to 1.499, a range of 0.198 The narrower (smaller) the range, the greater the precision. Now you should be able to rank the three sets of results.

chemistry
The range from the freezing temperature of water to the boiling point of water is as follows: Fahrenheit: 32 to 212 deg., a range of 180 degrees Celsius: 0 to 100 deg., a range of 100 degrees Kelvin: 273 to 373 deg., a range of 100 degrees So ... if we are talking about temper...

Chemistry
1. HCl (strong acid completely split into ions) *Find the concentration after dilution using: V1M1 = V2M2 (8.00mL)(0.10 M) = (100.0 mL)(M2) *M2 = (8.00mL)(0.10 M) / (100 mL) = ?______M *pH = -log(M2) 2. HC2H3O2 (weak acid only partially dissociated into ions): *Find the dilute...

Chemistry/pH- Weak Acid
The Rule of 5% may be reasonable but arbitrary. I have not seen it in any textbook I use. If the approximate solution is not satisfactory solve the quadratic equation: Ka = x^2 / (c-x) with he proper values for the Ka and c (the overall acid concentration). That is tedious sol...

Chemistry/Redox Reactions
1. Find the the standard cell potential of the initial Al-Ni electrochemical cell (before the addition of NaOH). Consult your General Chemistry textbook on how to do this. 2. The solubility equilibrium is: Al(OH)3(s) <=>Al^3+(aq) + 3OH-(aq) Ksp = [Al+3][OH]^3 [OH-](eq) =...

physics/science
If the plastic beads and the plastic beaker were electrically charged with the same kind of charge, how would they interact? I assume the beads are very light. When they were "poured" out of the beaker, What would the electrically charged beaker do to the beads? You ...

Chemistry/pH- Weak Acid
Go over the approximate solution solution I gave you in the previous question. You can improve the values you get by substituting and solving the quadratic equation, Ka = x^2 / c - x) The approximate solution is probably adequate. Check the method here: http://Jiskha.com/displ...

Chemistry/pH- Weak Acid
For a pH = 4, [H+] = antilog(-4.000) = 1.00x10^-4 Ka = [H+][A-] / [HA] Let [H+] = [A-] = x Ka = x^2 / (c - x) , where c = molar concentration of HA before dissociation. if c is much larger than x, we can simplify the expression to: Ka = x^2 / c (1.00x10^-6)c = 1.00x10^-8 c = 1...

Chemistry/Equilibrium calculations
I noticed I rewrote the Kp as 1x10^-22 instead of 1x10^-13. Sorry. In the comparison of Kp with Qp for the reverse reaction we have: Kp=10^13 > Qp=10^5, leading to the conclusion that CO is still changing to CO2 as it escapes and its concentration decreases as I suggested ...

Chemistry/Equilibrium calculations
Comment of my Qp calculation: I assumed that those percents are volume/volume percents. Since in the gas state moles are proportional to volume, and the partial pressure of each gas is proportional to moles, the volume percents were assumed to be proportional to partial pressu...

Chemistry/Equilibrium calculations
2CO2(g) <=> 2CO(g)+ O2(g) Kp = 1 E-13 (or 1.00x10^-22) The LEFT side is favored. It is perfectly proper to write the reaction backwards: 2CO(g)+ O2(g) <=> 2CO2(g) BUT now the Kp is the reciprocal of 1.00x10^-22 or Kp = 1.00x10^22 for the reversed reaction The ab...

chemistry
Not sure what you mean by "atomic nature". The formula of glucose is C6H12O6 which shows you how many atoms of carbon, hydrogen, and oxygen there are in one molecule of glucose.

Chemistry
To find the molarity, 1. Convert the 140 mLs of benzene to liters 2. Molarity = (moles of toluene) / (liters of benzene) NOTE: This is a continuation of the previous answer (finding the molality). Refer to steps 2 and 3.

Chemistry
1. Use: mass = (volume)*(density), or grams = (milliliters)(grams/ml) to calculate the mass (grams) of each compound. 2. Find the molar mass of toluene. 3. Divide the mass (grams) of toluene by the molar mass of toluene to convert grams to moles. 4. Convert the grams of benzen...

Chemistry
*Convert 1.750g of Fe(NH4)2(SO4)2•6H2O to moles by dividing by the molar mass of this compound. *Find the moles of H2C2O4 using: moles = (liters)(mol/L) Te moles ratio of the two reagents id 1 to 1. That means that the smaller number of moles belongs to the limiting reage...

ap chemistry
The topics of the questions you are asking are not covered adequately even in a college General Chemistry textbook. An Organic Chemistry textbook would be more helpful for most of the 13 questions. A good starting point for organic chemistry is the online textbook, General Org...

Chemistry
A very similar question was posted and answered here: http://Jiskha.com/display.cgi?id=1218235719 Check it out for the method used. It is the same as your question. Only the numbers are slightly different.

chemistry
Naming an organic compound or writing its name is not something you learn in one easy lesson. There are so many groups and so many rules. You need a course in organic chemistry just to get started. AP Chemistry and General Chemistry in college cover this very lightly. Here are...

chemistry
A condensed formula shows the functional groups in a molecule and any double or triple bonds, usually, on a single line. Here you have a a 4-carbon chain with a double bond between the 2nd and 3rd carbon. Also, methyl groups on carbons #2 and #3: CH3C(CH3)=C(CH3)CH3 Sometimes ...

chemistry
Convert 2.13 g TlOH to moles. Divide moles by 1 liter to get the molar concentration in moles/liter or "M". moles/L of TlOH = moles/L of OH- ions (since TlOH is a strong base). Calculate the pOH: pOH = -log[OH-] and pH = 14 - pOH

Chemistry
I looked up two half reactions form a "Standard Reduction Potentials" table. The 2nd half reaction occurred in reverse as an oxidation. I doubled this reaction so that the number of electrons gained and lost are equal. Then I combined the two half reactions into an o...

Chemistry
A comprehensive look at this equilibrium system and the experiment for determining the equilibrium constant is given here: http://www.scienceteacherprogram.org/chemistry/Tehilla98.html

Chemistry
The concentration of SCN- in the first mixture is: (1/10)(0.0020M) = 0.0020M) The concentration of Fe+3 was: (9/10)(0.200M) = 0.18 M Since the concentration of F+3 was 90 times the concentration of SCN-, we may assume the equilibrium, Fe+3(aq) + SCN-(aq) <=> FeSCN+2(aq),...

physics
Do you need a numerical answer? If the bat is flying towards the wall, f' = f*[V+Vs) / V] f' = unknown, f = 35 kHz, V = 343 m/s (in dry air, 20 deg C), Vs = (5.0*2 = 10 m/s) <--Based on drwls</> suggestion, the source moves with a velocity of 5.0 m/s toward th...

physics
Let the initial velocity = Vo The horizontal comonent, Vx = Vo(cos23) The horizontal distance, x = Vo(cos23)t = 8.7m t = 8.7m / Vo(cos23) The vertical component of initial velocity is Vyo: Vyo = Vo(sin23) Let the final vertical velocity be Vyf. Then, Vyf = 0 (a the highest pos...

chemistry
Not sure if you are asking about a molecule or an ion. The only structure I could come up with that would obey the octet rule using 60 valence electrons was: Cl-O3-P-P-O3-Cl The two P's linked to each other. Each P attached to 3 O's. Each Cl linked to an O. The total n...

organic chemistry
Do a Google image search on "morphine isomers". Look at the best structure you can find. Locate the central carbon atoms that are linked to four different "groups". The four "groups" could be four carbon atoms which are linked to different parts o...

o chemistry
Represent C #2 with a dot and C #3 with a concentric circle around the dot. C #2 (the dot) has two bonds coming out of it, one leading to a methyl, CH3 and another leading a Cl. C #3 (the circle) also has two bonds coming out of it, one leading to a methyl, CH3 and another lea...

Analytical Chemistry
The low pH is needed to prevent the Fe^+3(aq) indicator from hydrolyzing (forming hydroxy complexes and eventually iron(III) hydroxide). If the ferric salt indicator is altered, there is no clear end point during the titration.

chem 3A
I am giving outlines below for solving problems #1 and #2. The others involve the same or similar principles. The general topic is reaction stoichiometry. It is hard to cover such a broad topic adequately through postings here. Question #1 (a) Use the Ideal Gas Law to find t...

Chem 3A
The balanced chemical equation assumes a theoretical yield of 100%. To calculate the actual yield we must know the amounts of reactants (Mg and HCl) actually used.

Chem 3A
Metal + acid ---> metal salt + hydrogen gas Mg + HCl --> MgCl2 + H2 If you place the correct coefficient in front of HCl, you will have the chemical equation balanced for Cl and H (which it is not now).

Organic Chemistry
Another argument I just overlooked is that one of the reactants, cinnamaldehyde, contains a trans structure around the c=c double bond that is preserved in the final compound, 1,4-Diphenyl-1,3-butadiene. Thus, we cannot have two cis structures in the C=C-C=C chain which is the...

Organic Chemistry
It is most likely cis,cis-1,4-dephenyl-1,3-butadiene. If you draw it you would see a U-shaped molecule with the two phenyl groups getting close together at the the ends of the "U". Formation of this isomer is probably prevented by crowding (steric hindrance) at the e...

Chemistry
The moles of each reactant are: (8.8g of Mg) / (24.3gMg/moleMg) = 0.362 moles Mg 21.0g N2 / 28.01 g/mol N2 = 0.750 mol N2 The mole ratio of Mg to N2 in the chemical equation is 3/1 The mole ratio in the mixture is 0.362 mol Mg / 0.750 mol N2 or 0.483 mol Mg / 1 mol N2 ( a LOT ...

physics
100 km/h = 100000m/3600s = 27.8 m/s Vf^2 = Vi^2+2as The final velocity, Vf, is 0 0 = (27.8m/s)^2 + (2)(55m)(a) Solve for the acceleration, a. F = ma Use the acceleration from the previous step and the mass given to get the force, F.

Chemistry
I think the problem was constructed with the false assumption that the yield is independent of concentration and I accepted it uncritically. Le Chatelier's Principle still rules. Glad you were so alert. I checked [A]=[B]=3M with my setup and got a 75% yield, farther to the...

Chemistry
Since the answer I got is a bit different from the one given, here is my complete take on this: Assume 1 mole of A and 1 mole of B reacting (This is legitimate since the yield should be independent of the actual number of moles used as long as they are equal). Let's repres...

physics
Yours (Damon's) is a more elegant solution than mine, since you are using a more general formula for vertical motion and correct algebraic signs. I assume the relationship used is: Y = Yo + (1/2)gt^2, using the values you assigned. The zero point is the bottom of the cliff...

physics
The equation is: 50 m = (1/2)(9.8m/s^2)(t^2) (It is less confusing to use absolute values here-No negative signs) t = sqrt[(2*50m)/(9.8m/s^2)] = sqrt(10.2s^2) (t = much shorter than 40.2 s)

Organic Chemistry
Camphor has a carbonyl group which would produce an IR band at 1750 cm^-1. During the reduction, the C=O group would change to C-OH which absorbs IR at a much higher spatial frequency. The reduction might have been incomplete, with enough camphor present to produce the 1750 cm...

Chemistry
Use the Ideal Gas Law: PV = nRT Substitute: P = 0.973 atm V = Unknown. Solve for this variable. n = 0.01mol CO R = 0.0821 L.atm/K.mol [a constant] T = 9 + 273 = 282 K

physics
The combined resistance of resistors connected in series is the sum of their resistances. Just add the three resistances.

physics
Coulomb's Law is: F = kQ1*Q2 / d^2 k is a constant Let's represent each charge as "q" then the intial force F1 is: F1 = k*q*q / 1^2 = kq^2 doubling the charge, the new force, F2, is: F2 = k(2q)(2q) / 1^2 = 4kq^2 F2 is how many times bigger than F1?

physics
1 Pa = 1 N/m^2 [I think you meant 105kPa = 105000Pa] (1.8)(105000Pa) = 189000 Pa = 189000 N/m^2 Total area of contact = (0.025 m2)(4) = 0.100 m^2 If you multiply the total pressure by the area of contact you will get the total weight in newtons. Note: If you divide the weight ...

physics
Convert km/h to m/s: (90 km/h)(1000m/1km)(1 h/3600s) = 25.000 m/s (75 km/h)(1000m/1km)(1 h/3600s) = 20.833 m/s Let time of catching up = t The distance travelled by slower car = (20.833 m/s)(t) The distance travelled by faster car = (25.000 m/s)(t) The distance travelled by th...

physics
Let "omega" = w = angular velocity 1 rev/s = 2pi rad/s angular velocity = w = (0.400)(2pi rad/s) = 2.5133 rad/s Linear velocity = v = wr v = (2.5133 rad/s)(1.5m/rad) = 3.77 m/s Linear accel. = (change in velocity)/time = a a = (Vf - Vi)/t = (3.77 m/s - 0)/2.00 s = __...

organic chemistry
One bromine atom becomes attached to the first carbon in the first stage of the reaction. The 2nd carbon becomes positive and bond with a water molecule which then loses a proton to form a hydroxyl group. H2C=CHCH2CH2CH3 + Br2 --> BrH2C-CH(+)CH2CH2CH3 + Br- BrH2C-CH(+)CH2CH...

Organic chemistry
We would use a Friedel-Crafts alkylation of benzene: Benzene + 1-chloropropane ---> Propylbenzene + HCl. The catalyst used is AlCl3

chemistry
The procedure suggested by DrBob 222 will give the correct answer to the question. However, the wording of the question itself could be improved. It might be: "Calculate the total volume of solution (water + CaCl2) when a 0.0250 M CaCl2 solution is prepared by dissolving ...

organic chemistry
Acetic acid can be neutralized with sodium bicarbonate. The products of neutralization are H2O, CO2, and sodium acetate, NaC2H3O2. Carbon dioxide,CO2, escapes as a gas. Sodium acetate dissolves in water. So, the excess of acetic acid is first converted to other compounds that ...

chemistry
Do a Google search using as your search phrase: partial molar enthalpy of solutions. The very first result will be a PDF file that will addresses your topic. I hope you are familiar with partial derivatives and the laws of thermodynamics sufficiently to understand this file. M...

Chemistry
It is great working with you again DrBob. I answered this same question on another network that allows links. The student was kind enough to provide a link to the procedure with a diagram, otherwise I would not have been able to visualize the experiment. My usual approach is t...

Chemistry
Comment: Lab questions are difficult to judge because we do not know what the instructions were, how close they were followed, and what assumptions can be made in answering the post-lab questions. Here is my take on the questions on the determination of the Gas Constant, R. I...

Organic Chemistry
The major product is 1-cyclohexenol or 1-hydroxycyclohexene. The tautomeric form is cyclohexanone.

Chemistry
Thank you, DrBob. JenniferT deserved a correct answer.

Chemistry
Since the solutions are 1.0M, E(cell) equals the difference of the standard reduction potentials. In more complicated cases (molar concentrations not equal to 1.0M) you would have to use the Nernst Equation.

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