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July 23, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
when sulfuric acid is added to solid sodium chloride and the mixture is heated, hydrogen chloride gas is generated, leaving a solid residue of sodium sulfate
Friday, September 27, 2013 at 12:37pm

chemistry
when sulfuric acid is added to solid sodium chloride and the mixture is heated, hydrogen chloride gas is generated, leaving a solid residue of sodium sulfate
Friday, September 27, 2013 at 12:36pm

chemistry
CAN NaOH(aq)+Co2 yield NaHCO3 PLEASE ANSWER DEEPLY!!!!!!!!!!!!!!!
Friday, September 27, 2013 at 11:40am

Chemistry
At room temperature, 80.0 ml of 0.125 M AgNO3(aq) and 20.0 ml of 0.500 M Fe(NO3)2(aq) are mixed together, generating the following equilibrium system Ag+ (aq) + Fe2+(aq) Ag(s) + Fe3+(aq). At equilibrium, the concentration of Fe3+ is 0.00505 M. (a) (4 pts) Calculate the initial...
Friday, September 27, 2013 at 12:54am

chemistry
The pH of a 0.164 M aqueous solution of dimethylamine is 11.98. Write the ionization equation, calculate the values of Kb and pKa and comment on strength of the
Friday, September 27, 2013 at 12:48am

chemistry
what are the products of the equation Al(s)+HCl(aq)AlCl3(aq)H2(g)?
Thursday, September 26, 2013 at 11:55pm

Chemistry
what is the electron arrangement and electron configuration of Fe3+? it loses 3 electrons so is it vanadium.... please explain.. by the way is this a transition metal? if so are there any rules?...... i dont understand!!!
Thursday, September 26, 2013 at 11:20pm

AP Chemistry
Pb(s)|PbSO4(s)|SO2−4(aq,0.60 M)||H+(aq,0.70 M)|H2(g,192.5 kPa)|Pt. If E◦for the cell is 0.36 V at 25◦C, write the Nernst equation for the cell at this temperature. out of the five following choices, which one is correct 1.E= 0.36 + 0.01285 ln 192.5(0.70)2(0....
Thursday, September 26, 2013 at 8:17pm

AP Chemistry
For the reduction of Cu2+by Zn, ∆G◦=−212 kJ/mol and E◦= +1.10 V. If the coefficients in the chemical equation for this reaction are multiplied by 2, ∆G◦=−424 kJ/mol. This means E◦= +2.20 V. True or false?
Thursday, September 26, 2013 at 7:26pm

AP Chemistry
Calculate the standard cell emf for galvanic cells with the cell reaction 2H2(g) + O2(g)→2H2O(ℓ)in acidic solution. Answer in units of V
Thursday, September 26, 2013 at 7:04pm

Chemistry Plz Help
Calculate the correct boiling point for nitrobenzene. Assume that a total immersion thermometer was used. The obs. boiling point was 205 degree celsius. The reflux ring in the test tube just reached up to the 0 degree celsius mark on the thermometer. A second thermometer ...
Thursday, September 26, 2013 at 5:56pm

Organic chemistry plz help me out (thanks)
1) a) What is the normail boiling point (760 mm Hg) for a compound that boils at 150 degree celsius at 10 mm Hg pressure? b) At which temperature would the compund in (a) boil if the pressure were 40 mm Hg? c) A compound was distilled at atmospheric pressure and had a boiling ...
Thursday, September 26, 2013 at 5:47pm

Chemistry
one sample of magnesium fluoride produced 1.65kg of magnesium and 2.58kg of fluorine. A second sample produced 1.31kg of magnesium. How much fluorine (in grams) did the second sample produce?
Thursday, September 26, 2013 at 3:34pm

HELP!! Chemistry
Round your answer to the correct number of significant digits and show work. 1. How many grams of NaI would be used to produce a 2.0 M solution with a volume of 10.00 L? 2. What is the molarity of a 2.50 x 102 cm3 solution containing 450.0 g of C6H12O6 ? 3. How many moles of ...
Thursday, September 26, 2013 at 2:33pm

Chemistry
A volume of 60.0mL of aqueous potassium hydroxide (KOH ) was titrated against a standard solution of sulfuric acid (H 2 SO 4 ). What was the molarity of the KOH solution if 25.7mL of 1.50 M H 2 SO 4 was needed? The equation is 2KOH(aq)+H 2 SO 4 (aq)¨K 2 SO 4 (aq)+2H ...
Thursday, September 26, 2013 at 2:09pm

chemistry
explain how you would make 200. mL of a 0.150 M solution of calcium chloride, if provided with the solid
Thursday, September 26, 2013 at 10:08am

CHEMISTRY
The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported. Calculate the total free ...
Thursday, September 26, 2013 at 1:05am

Chemistry
You have 800 mL of a 0.050M phosphate buffer, pH 6.5. You need to increase the pH of this buffer to 7.5 by using 6.00M NaOH. Determine the volume of NaOH needed. What will be the final concentration of the buffer?
Wednesday, September 25, 2013 at 9:40pm

Chemistry
How would temperature changes observed using a calorimeter differ for exothermic and endothermic reactions?
Wednesday, September 25, 2013 at 9:19pm

Chemistry
Are there any sources of heat exchange neglected in a experiment with calorimeter?
Wednesday, September 25, 2013 at 9:18pm

Chemistry
Explain why is it possible to use the value 4.184 j/g C for the heat capacity of the various solutions in this experiment (HCL HNO3 H2SO4 CH3COOH H3PO4 HCOOH (COOH)2)
Wednesday, September 25, 2013 at 9:16pm

chemistry
Calculate the number of hydrogen molecules formed when 5.6 mL of ammonia at STP is decomposed by the following reaction: ___NH3 „³ ___ N2 + ___ H2
Wednesday, September 25, 2013 at 8:23pm

chemistry
Calculate the volume of oxygen at STP required to burn 3.7 kg C3H6O2 producing CO2 & H2O:
Wednesday, September 25, 2013 at 8:09pm

Chemistry
Combustion of a 0.1595 g of menthol (156 g/mol) produces .449 g of Carbon Dioxide and 0.184 g of Water. What is the formula of menthol? I am really confused as to where to start. I converted the Carbon Dioxide and Water to moles and got .102 mol for both of them but now I don...
Wednesday, September 25, 2013 at 7:55pm

Chemistry
You mix 200.0 mL of 0.350 M HCl with a 300.0 mL solution of 0.100 M Ba(OH)2. Calculate the concentration of each ion remaining in the solution after the reaction has reached completion.
Wednesday, September 25, 2013 at 7:17pm

Organic chemistry
Name all the isomers for c5h10br2
Wednesday, September 25, 2013 at 6:49pm

Chemistry
If 4.41 moles of C5H12 react with excess O2, how many moles of CO2 will be produced in the following combustion reaction? C5H12+8O2 --> 6H2O+5CO2
Wednesday, September 25, 2013 at 6:23pm

Chemistry
Is Bronze an element, compound, heterogenous mixture or homogenous mixture?
Wednesday, September 25, 2013 at 5:52pm

Chemistry
What does it mean when a metal has a high specific heat? And what would be the effect in your value of specific heat if the metal was not left in the boiling water long enough to reach the temperature of the water
Wednesday, September 25, 2013 at 5:32pm

chemistry
na+c1-(aq)+hc1(aq)
Wednesday, September 25, 2013 at 3:45pm

chemistry 1405
how to write a nuclear equation for the nuclear decay of Ra-226 to an isotope of radon-222
Wednesday, September 25, 2013 at 1:34pm

organic chemistry
Consider the crystallization of sulfanilamide from 95% ethyl alcohol. If impure sulfanilamide is dissolved in the minimum amount of 95% ethyl alcohol at 40°C rather than 78°C (the boiling point of ethyl alcohol), how would this affect the percent recovery of pure ...
Wednesday, September 25, 2013 at 12:35pm

chemistry
analysis of a mixture of carbonate and bicarbonate: I did an experiment where 2.306g of unknown was diluted with distilled water to 250ml. Then 3 25mL samples of this unknown were titrated with .0663 M HCl and end point volumes were: 41.12mL, 41.00mL and 40.99mL. Then 3 more ...
Wednesday, September 25, 2013 at 10:03am

chemistry
What is the magnitude of the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Please report your answer in joules.
Wednesday, September 25, 2013 at 9:07am

statistics
A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8. What is the probability of getting a score higher than 71 on this exam?
Tuesday, September 24, 2013 at 10:51pm

chemistry
In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. How many molecules of substance B are produced when 26.5 g of substance A reacts? The molar mass of substance A is 21.9 g/mol. Step 1: Convert the mass of A to moles. Step 2: ...
Tuesday, September 24, 2013 at 10:07pm

chemistry
A rectangular sheet of lead shielding is placed over the chest of a patient in a dental office while X rays are taken. The sheet measures 65.0 cm by 55.0 cm by 0.30 cm. If the density of lead is 11.3 g/cm3, what is the mass of lead apron?
Tuesday, September 24, 2013 at 9:16pm

chemistry
A rectangular sheet of lead shielding is placed over the chest of a patient in a dental office while X rays are taken. The sheet measures 65.0 cm by 55.0 cm by 0.30 cm. If the density of lead is 11.3 g/cm3, what is the mass of lead apron?
Tuesday, September 24, 2013 at 9:16pm

chemistry
A rectangular sheet of lead shielding is placed over the chest of a patient in a dental office while X rays are taken. The sheet measures 65.0 cm by 55.0 cm by 0.30 cm. If the density of lead is 11.3 g/cm3, what is the mass of lead apron?
Tuesday, September 24, 2013 at 9:15pm

chemistry
write the balanced equation for the reactions of aquesous pb(CIO3)2 with aqueous Nal. include phases. 2.If a solution containing 86.044 g of mercury(II) chlorate is allowed to react completely cointaing 15.4888 g of sodium sulfide, how many grams of solid precipate will be ...
Tuesday, September 24, 2013 at 9:11pm

Chemistry
2 NaN3(s) = 2 Na(l) + 3 N2(g) How many grams of NaN3 are needed to produce 20L of N2(g) at 303K and 776mmHg?
Tuesday, September 24, 2013 at 8:46pm

Chemistry
Convert 1.46 mm to inches.
Tuesday, September 24, 2013 at 8:07pm

12th grade chemistry
What is the structure for ethyl ethanamide? (Ie. c-c-N-c-c) ??? Thanks
Tuesday, September 24, 2013 at 7:35pm

Chemistry
There are two flask, one filled with a)ice bath, and b)boiling water. Ice bath: 1.00 L O^2(g) at STP Boiling water: 1.00 O^2(g) If we want the pressure to remain at 1.00bar when the O^2(g) is heated to 373K, what mass of O^2 must we release from the flask? I know that I should...
Tuesday, September 24, 2013 at 5:59pm

Chemistry
which is more accurate direct weighting or weighing by difference?
Tuesday, September 24, 2013 at 12:26pm

Chemistry
Microwave ovens emit microwave energy with a wavelength of 12.5 cm. What is the energy of exactly one photon of this microwave radiation?
Tuesday, September 24, 2013 at 11:48am

chemistry
A 6.25 gram sample of copper(II) chloride hydrate was heated until all the water was liberated. The residue massed 4.45 grams. How many water molecules are present for every formula unit of copper(II) chloride?
Tuesday, September 24, 2013 at 3:17am

Chemistry
Upon heating 8.5g sample of Sodium Sulfate hydrate, it loses 4.776 grams after heating. What steps are necessary for me to find the n for the hydrate? GIVEN: Na2SO4 - n H2O the molar mass of sodium sulfate is 142.05g/mol
Tuesday, September 24, 2013 at 3:12am

Chemistry
If 4.00 grams of the hydrate in #1 are heated how many grams of anhydrous salt would remain after all the water was liberated?
Tuesday, September 24, 2013 at 2:46am

Chemistry
Select the statements that correctly describe buffers.? 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) The Ka of a buffer does not change when any amount of an acid is added to the buffer solution. 3) The pH of a ...
Monday, September 23, 2013 at 11:06pm

chemistry
A laser pulse with wavelength 540 nm contains 4.40 Mj of energy. How many photons are in the laser pulse?
Monday, September 23, 2013 at 11:01pm

Chemistry
If a student used an iron scoopula, instead of a plastic one, to add the unknown metal to the HCl solution, will it affect the calculated molar mass of the unknown metal? If so, how? Justify your answer with an explanation.
Monday, September 23, 2013 at 9:04pm

Chemistry
Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Justify your answer with an explanation.
Monday, September 23, 2013 at 9:02pm

AP Chemistry
redox reaction: Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?
Monday, September 23, 2013 at 8:45pm

Chemistry
Table salt, NaCl, and sugar C12H22O11 are accidentally mixed. A 5.50g sample is burned and 3.60g of CO2 is produced. What was the mass percentage of the table salt mixture?
Monday, September 23, 2013 at 8:27pm

chemistry
Which of the following is a precipitation reaction? I. 2 Mg (s) + O2 (g) → 2 MgO (s) II. SO3 (g) + 2 H2O (l) → H3O+ (aq) + HSO4- (aq) III. Pb2+ (aq) + CrO42- (aq) → PbCrO4 (s) IV. 2 H2O (g) → 2 H2 (g) + O2 (g) V. Ag+ (aq) + 2 NH3 (aq) → [Ag(NH3)2...
Monday, September 23, 2013 at 5:37pm

Chemistry
How many moles of H2O are in 3.00L of water? (d=1.00g/mL)
Monday, September 23, 2013 at 4:30pm

chemistry
the density aniline c6h5nh2 is 1.02g/mL how many molecules are present in 1.00Lsample
Monday, September 23, 2013 at 7:01am

Chemistry
A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities do not react, what...
Sunday, September 22, 2013 at 10:28pm

chemistry
Use Henry's law to determine the molar solubility of helium at a pressure of 1.2atm and 25 ∘C. Express your answer using two significant figures.
Sunday, September 22, 2013 at 9:32pm

Chemistry
Acetylsalicylic acid (C9H8O4) is a monoprotic acid commonly known as "aspirin." A typical aspirin tablet, however, contains only a small amount of the acid. In an experiment to determine its composition, an aspirin tablet was crushed and dissolved in water. It took ...
Sunday, September 22, 2013 at 7:58pm

Chemistry
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 +2HCl yields CaCl2 +H2O +CO2 How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 13.0 g of hydrochloric acid...
Sunday, September 22, 2013 at 7:09pm

Chemistry- is this correct?
34 meters/seconds = _____ mm/hour I know 1 m is 1000 mm and 60 seconds is 1 hour. So I got 2040000. Would the answer in scietnific notation and significant figures be 2.0 x 10^6 mm/hour?
Sunday, September 22, 2013 at 6:23pm

Chemistry
What volume of 0.01 M NaOH should be required to raise the pH of a litre of 25 mM H2SO4 to 4.0? I started out by attempting to find the initial pH of H2SO4 and determined I need 2.57 units of pH to raise it to 4. I know that somewhere I use the HH equation, but don't know ...
Sunday, September 22, 2013 at 6:20pm

Chemistry
Please Explain! I dont understand how the answer is B. Which ionization requires the most energy? A. Na--> Na superscript + plus one electron B. Na superscript + -----> Na superscript 2+ plus one electron C. Mg---> Mg superscript + plus one electron D. Mg superscript...
Sunday, September 22, 2013 at 3:44pm

Chemistry
In four of the following groups, the three substances are either all strong electrolytes, all weak electrolytes, or all nonelectrolytes. Which group has one member which is NOT like the others in the group? 1. NaCl; Ca(OH)2; HNO3 2. BaCl2; NaNO3; HF 3. O2; CO(NH2)2; CH3OH 4. ...
Sunday, September 22, 2013 at 3:31pm

Chemistry
Which of the following metals or nonmetals are expected to displace Mn or Cl (respectively) from MnCl2? 1. Ca should displace Mn. 2. Br should displace Cl. 3. Cu should displace Mn. 4. I should displace Cl.
Sunday, September 22, 2013 at 3:29pm

Chemistry Graphing
So for Chem we have to answer a question asking why graphing is a more accurate method for measuring density than manually calculating the density. I originally thought that manually calculating was better, but my teacher told me that I would have to back that up with a lot of...
Sunday, September 22, 2013 at 3:27pm

Chemistry
If aqueous hydrofluoric acid is reacted with sodium hydroxide, which of the following substances are in the net ionic equation? 1. hydrofluoric acid, hydroxide ion, hydronium ion, fluoride ion, and water 2. hydrofluoric acid, sodium ion, hydroxide ion, ...
Sunday, September 22, 2013 at 3:19pm

chemistry
Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
Sunday, September 22, 2013 at 3:11pm

Chemistry
calculate q , w , and ∆ E for melting 1.00 mol of ice at 0 ◦ C and 1.00 atm pressure
Sunday, September 22, 2013 at 2:41pm

Chemistry
A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 18.8 cm3 of ethanol, what was the final temperature ...
Sunday, September 22, 2013 at 2:40pm

Chemistry
The combustion of ethane (C2H6) produces carbon dioxide and steam: 2C2H6+702 yields 4CO2 +6H2O How many moles of CO2 are produced when 5.30 mol of ethane are burned in an excess of oxygen?
Sunday, September 22, 2013 at 2:23pm

question
is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect
Sunday, September 22, 2013 at 1:05pm

chemistry
what is the name of reaction for 3C2H2--> C6H6?
Sunday, September 22, 2013 at 12:21pm

Physical Chemistry
Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so, obtain an expression for V as a function of T and β at constant P.
Sunday, September 22, 2013 at 11:41am

Science/ Chemistry
When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for the reaction of ...
Sunday, September 22, 2013 at 10:15am

Chemistry
How many sulfate ions are there in 2.500 mL of 5.0 x 10-15 moles of Cr2(SO4)3?
Sunday, September 22, 2013 at 9:56am

Chemistry
Calculate the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7. Please report your answer in kJ/mol.
Sunday, September 22, 2013 at 9:32am

Chemistry
What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Please report your answer in joules.
Sunday, September 22, 2013 at 9:31am

Chemistry
What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Please report your answer in joules.
Sunday, September 22, 2013 at 9:31am

Chemistry
Provide the products for this reaction: CH3O- +CH3SH -> ????
Sunday, September 22, 2013 at 6:25am

Chemistry
Why does aniline turn brown upon standing? Does it also turn brown upon heating?
Sunday, September 22, 2013 at 3:56am

Chemistry
The half life of U238 is 4.5 x 10^9 yr. A sample of rock of 1.6 g produces 29 dis/sec. Assuming all radioactivity is due to U238 find percent by mass of U 238. I have tried ln(t)/ln(0)= -kt and still cannot get the answer What I get is A) 4.5x10^9 x365x60x60x24=1.419x10^17 for...
Sunday, September 22, 2013 at 12:26am

Chemistry
When electrons get excited can they only move up one level or can they go up multiple orbitals, but just one at a time.
Saturday, September 21, 2013 at 11:36pm

Chemistry
An element with the symbol Z has the electron configuration 2.8.6. Which species is this elrment most likely to form? A. The ion Z 2+ B. The ion Z 6+ C. The compound H subscript 2 Z D. The compound Z subscript 6 F Which ionization requires the most energy? A. Na--> Na ...
Saturday, September 21, 2013 at 10:56pm

chemistry
The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side to span a distance of 4.90 mm?
Saturday, September 21, 2013 at 10:53pm

Chemistry
The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/...
Saturday, September 21, 2013 at 9:45pm

Chemistry
Please help! I have spent hours trying to work these three problems. How many grams of solid barium sulfate form when 27.1 mL of 0.160 M barium chloride reacts with 53.4 mL of 0.065 M sodium sulfate? Aqueous sodium chloride forms also. I have converted the 27.1mL to .0271L, ...
Saturday, September 21, 2013 at 9:17pm

Chemistry
Consider the following reaction: 2Fe2O3 --> 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a. the release of 150 kJ of heat b. the release of 12000 kJ of heat c. the absorption of 12000 kJ of heat d. the absorption of 150 kJ of heat e...
Saturday, September 21, 2013 at 9:07pm

Chemistry
A1g sample of enriched water, a mixture of H2O AND D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL, sample of the 1 L solution was reacted with excess AgNO3 and 0.3800g of ...
Saturday, September 21, 2013 at 7:37pm

chemistry
A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16 meV of energy. What is the size of the box? Please report your answer in nm.
Saturday, September 21, 2013 at 6:24pm

Chemistry
What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O
Saturday, September 21, 2013 at 5:13pm

Chemistry
An unknown compound contains only C, H, and O. Combustion of 4.50 g of this compound produced 10.2 g of CO2 and 4.19 g of H2O. What is this empirical formula of the unknown compound?
Saturday, September 21, 2013 at 5:09pm

chemistry
Butane gas, C4H10(g), is commonly used as a fuel in barbeque gas cylinders. Write a balanced chemical equation for the combustion of butane gas
Saturday, September 21, 2013 at 2:57pm

Chemistry.........
Elemental chlorine exists as a diatomic molecule Cl2. Chlorine atoms exist in two different isotopes 35Cl and 37Cl. In the mass spectrum of chlorine molecules, how may peaks due to chlorine atoms would be observed? 2 how many different peaks due to the molecular ion would be ...
Saturday, September 21, 2013 at 2:43pm

Chemistry
Calculate the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7.
Saturday, September 21, 2013 at 1:36pm

Chemistry
What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10
Saturday, September 21, 2013 at 1:36pm

Chemistry
A sample of 2.08 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.682◦C to 25.899◦C. What is ∆Hsolution for substance Z? Assume no heat is lost/gained by the ...
Saturday, September 21, 2013 at 12:13pm

Chemistry stoch1
Calculate mass of iron, which will be converted into (Fe3O4) by the action of 18g of steam on it.
Saturday, September 21, 2013 at 11:54am

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