Thursday
October 2, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry
The Young's modulus for a material is 8.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3)
Friday, November 15, 2013 at 6:08am

Chemistry
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1139 K. Assume the pre-exponential factor is one.
Friday, November 15, 2013 at 6:06am

Chemistry
Dr.Bob, this is regarding to the enthalpy posts.... I don't understand why you just switch it to negative??How do you know that it is neg???? I thought it started out neg though the problem does not give the number.... I am sorry,but I am a very slow learner...thank you ...
Friday, November 15, 2013 at 12:45am

chemistry
1. A website promoting the use of alternative energy vehicles and hybrid technologies claims that, \"A typical automobile in the USA uses about 500 gallons of gasoline every year, producing about 5 tons of carbon dioxide.\" To determine the truth of this statement, ...
Thursday, November 14, 2013 at 11:09pm

CHEMISTRY
Post a New Question Current Questions Homework Help: Chemistry Posted by Anonymous on Thursday, November 14, 2013 at 8:45pm. CONTINUE>>>>>>>>​>>> The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->...
Thursday, November 14, 2013 at 9:40pm

Chemistry
CONTINUE>>>>>>>>​>>> The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 (there is a degree sign....standard enthalpy of formation??) *****WAIT A SECOND, IF I USE THE HEAT OF ...
Thursday, November 14, 2013 at 8:45pm

Chemistry, Science
How many Cl- ions are present in 2.35 mol of CaCl2 and please show steps ! Need help so I can study for a huge test tomorrow
Thursday, November 14, 2013 at 8:39pm

Chemistry
A solution is made by adding 0.100 mole of ethyl ether to 0.500 mole of ethyl alcohol. If the vapor pressures of ethyl ether and ethyl alcohol at 20 oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20 oC (assuming ideal behavior) is:
Thursday, November 14, 2013 at 8:37pm

Chemistry
Benzene (C6H6) and toluene (C5H5CH3) form nearly ideal solutions. At 20°C the vapor pressure of benzene is 74.7 Torr and that of toluene is 22.3 Torr. a) Find the equilibrium partial pressures above a solution of 100.0 g benzene and 100.0 g toluene. b) Find the mole ...
Thursday, November 14, 2013 at 8:35pm

chemistry
which of the following alkane names is correct? a)2-methyl-3-propylhexane b)1-methylnonane c)1,2-dimethylhexane d)4,5-dimethylpentane e)all of the above names are correct
Thursday, November 14, 2013 at 7:36pm

Chemistry
I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE.... BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS NEGATIVE(ACCORDING TO THE ...
Thursday, November 14, 2013 at 7:32pm

CHEMISTRY
I know I posted this question before, but can you clarify it?? MY QUESTION IS AFTER YOU SWITCHED THE DELTA H1 THE CHANGE IN THE ENTHALPY IS NEGATIVE.... BUT THAT DOES NOT MAKE SENSE BECAUSE THE CHANGE IN ENTHALPY OF THE ORIGINAL DELTA H1 IS NEGATIVE(ACCORDING TO THE ...
Thursday, November 14, 2013 at 6:43pm

chemistry
how do we determine Cmolar ,metal from Cs,metal
Thursday, November 14, 2013 at 4:50pm

Chemistry
What fraction of glutamate is charged in milk
Thursday, November 14, 2013 at 9:52am

chemistry
Draw the compound that would produce 4-ethyl-3-hexanol in the presence of a nickel catalyst and hydrogen.Please help!!!!!
Thursday, November 14, 2013 at 9:21am

Chemistry
Your space ship has docked at a space station above Mars. The temperature inside the space station is 24oC at a pressure of 745mmHg. A balloon with a volume of 425mL drifts into the airlock where the temperature is -95oC and the pressure is 0.115 atm. What is the new volume of...
Thursday, November 14, 2013 at 8:23am

chemistry
What is formed when zinc carbonate reacts with concentrated hydrochloric acid?
Thursday, November 14, 2013 at 6:50am

Chemistry
16.3L N2 at 25 degrees Celsius and 125 kPa and 41.9L O2 at 25 degrees Celsius and 125 kPa were transferred to a tank with a volume of 5.25L. What is the total pressure at 55 degrees Celsius?
Thursday, November 14, 2013 at 12:25am

chemistry
Area of a lake is 28958 square miles and depth is 207 ft.If there is 35 gram of salt per liter of water, how many grams of salt is there?
Wednesday, November 13, 2013 at 10:23pm

chemistry
I am having a hard time with this problem. I was wondering where I went wrong. The problem says The equilibrium constant, Kc, for the reaction of H2 and N2 is 1.7×10^2 at 225 ∘C. 3H2(g)+N2(g)←→2NH3(g) If the system at equilibrium contains 0.16M H2 and 0...
Wednesday, November 13, 2013 at 9:56pm

chemistry
Draw the compound that would produce 4-ethyl-3-hexanol in the presence of a nickel catalyst and hydrogen.Please help!!!!!
Wednesday, November 13, 2013 at 9:19pm

Chemistry- DrBob222
Can you please write the isomer name though? I will draw it from that. Write an isomer of structure for a), b) and c) and name them. a) 3,3-dimethylpentane b)3-methyl-4-ethyl-1-hexyne c)3,3,4-trimethyl-1-pentene
Wednesday, November 13, 2013 at 9:02pm

chemistry
how to solve problem-car with 13.45 gallon tank gets 28 miles/gallon. If gas costs 3.543/gallon, how much it will cost to travel 1550 miles
Wednesday, November 13, 2013 at 8:39pm

CHEMISTRY
Is this exothermic or endothermic? EXPLAIN C2H2+H2-----> C2H4 Is this exothermic or endothermic? EXPLAIN C2H2+2H2---->C2H6 Is this exothermic or endothermic? EXPLAIN C2H4+ H2 ----> C2H6
Wednesday, November 13, 2013 at 8:10pm

chemistry
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.220 moles of a monoprotic weak acid (Ka = 3.7 × 10-5) is titrated with NaOH, what is ...
Wednesday, November 13, 2013 at 7:35pm

chemistry
500.0 mL of 0.140 M NaOH is added to 625 mL of 0.200 M weak acid (Ka = 1.37 × 10-5). What is the pH of the resulting buffer?
Wednesday, November 13, 2013 at 7:34pm

Chemistry
Does 1cm^3 equal to 1liter???
Wednesday, November 13, 2013 at 7:30pm

chemistry
Add up the total mass of carbohydrates, fats, and proteins in a serving of eggplant. What fraction of the eggplant's weight is made up of these ingredients?
Wednesday, November 13, 2013 at 7:29pm

CHEMISTRY PLEASE HELP
Write an isomer of structure for a), b) and c) and name them. a) 3,3-dimethylpentane b)3-methyl-4-ethyl-1-hexyne c)3,3,4-trimethyl-1-pentene
Wednesday, November 13, 2013 at 7:25pm

CHEMISTRY PLEASE HELP
Write an isomer of structure for a), b) and c) and name them. *(N.B- ! rep. a bond) a) CH3 ! CH3-CH2-C-CH2-CH3 ! CH3 CH3 ! b) CH3-CH2-CH-CH-C(TRIPLE BOND)CH ! CH2 ! CH3 c) 3,3,4-trimethyl-1-pentene
Wednesday, November 13, 2013 at 7:21pm

chemistry
Why are some solutions seen by the human eye with specific colors, while other solutions are observed to be colorless??
Wednesday, November 13, 2013 at 2:36pm

chemistry
Draw the compound that would produce 4-ethyl-3-hexanol in the presence of a nickel catalyst and hydrogen.Plaese help!!!!!
Wednesday, November 13, 2013 at 11:26am

chemistry
How do you draw the structure of the reaction of 1-hexene with h2o in the presence of acid
Wednesday, November 13, 2013 at 10:38am

statistic
3 statistics professors and 7 chemistry professors are available to be advisors.If each professor has an equal chance of being selected, what is the probability that both professors are cgemistry professors?
Wednesday, November 13, 2013 at 8:52am

CHEMISTRY
An ethanol-water solution is prepared by dissolving 10.00 ml ethanol C2H5OH (density=0.789g/ml) in sufficient water to produce 100.00 ml of solution with a density of 0.982g/ml. What is the concentration of ethanol in this solution? Expressed as ml. a.)%volume b.)%mass c.)%m/v...
Wednesday, November 13, 2013 at 8:00am

Chemistry
Would the value of molar absorbitivity value be greater, less, or equal for the absorbance of light at 550nm vs 650 nm?
Wednesday, November 13, 2013 at 12:11am

Chemistry
Why are some solutions seen by the human eye with specific colors, while other solutions are observed to be colorless??
Wednesday, November 13, 2013 at 12:00am

chemistry
At a certain Pressure and Temperature one liter of CO2 weigh's 1.95g. What is the mass of one liter of C4H10 at the same temperature and pressure
Tuesday, November 12, 2013 at 11:11pm

chemistry
a student was asked to prepare 100.0 mL of 0.0200 M solution of HCL from 0.400 M solution of HCL. in order to do this he measured 5.0 mL of 0.400 M HCL with a graduated cylinder, transfered this amount to a 100 mL beaker, added 95 mL of deionized water measured with a ...
Tuesday, November 12, 2013 at 11:08pm

CHEMISTRY
When 50.0 cm3 of 0.100 mol dm-3 AgNO3 is mixed with 50.0 cm3 of 0.0500 dm-3 HCl in a polystyrene cup, the temperature increases from 20.00°C to 20.35°C. Assume that the specific heat capacity of the solution is the same as that of water, and that the density of the ...
Tuesday, November 12, 2013 at 10:31pm

chemistry
Is CO2 a product of an acid/base reaction?
Tuesday, November 12, 2013 at 9:10pm

Chemistry
What molecular formula can you deduce from a mass spectrometry of 156 m/z. And how do you get that formula? Steps on how to get the formula is much appreciated! Thanks!
Tuesday, November 12, 2013 at 5:20pm

Chemistry
Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12× 10–12. What is the solubility (in mol/L) of silver chromate in 1.4 M potassium chromate aqueous solution? In 1.4 M silver nitrate aqueous solution? In pure water?
Tuesday, November 12, 2013 at 4:11pm

Chemistry
The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (in g/L) of CaSO4(s) in 0.300 M Na2SO4(aq) at 25 °C
Tuesday, November 12, 2013 at 3:19pm

chemistry
a 60.0 g sample of chromium at 82.0 degrees celsius was place in 80.0 g of water. Assume there is no loss of heat to the environment. What is the final temperature of the water and chromium? The initial water temperature was 24.0 degrees celsius
Tuesday, November 12, 2013 at 12:54pm

chemistry
Two new metallic elements have been discovered, Cimium (Ci) and Sadowium (Sd). Both the pure elements and their solutions form simple cubic lattices. The bond strengths of the Ci-Ci and Sd-Sd bonds are known, but not the Ci-Sd bond. Bond Bond Energy (kJ/mole) Ci-Ci -245 Sd-Sd...
Tuesday, November 12, 2013 at 11:54am

Chemistry
A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.
Tuesday, November 12, 2013 at 11:19am

chemistry
Draw the compound that would produce 4-ethyl-3-hexanol in the presence of a nickel catalyst and hydrogen.
Tuesday, November 12, 2013 at 9:00am

Chemistry
Measuring the conductivity of an aqueous solution in which 0.0200 mol CH3COOH has been dissolved in 1.00 L of solution shows that 2.96 % of acetic acid molecules have ionized to CH3COO- ions and H3O+ ions. Calculate the equilibrium constant for ionization of acetic acid and ...
Tuesday, November 12, 2013 at 7:07am

Chemistry
Define minimum assay
Tuesday, November 12, 2013 at 4:08am

chemistry
What is the final volume of NaOH solution prepared from 250.0mL of 0.800M NaOH if you wanted the final concentration to be 0.200M
Tuesday, November 12, 2013 at 1:09am

Chemistry
Assume that the normal blood buffer contains 0.00080 M carbonic acid and 0.0085 M hydrogen carbonate, the pKa = 6.35 for carbonic acid and the volume of blood in the body is 7.00 L. The blood pH, due to disruption is now 7.20. What is the ratio of [HCO3−]/[H2CO3] now ...
Monday, November 11, 2013 at 11:05pm

Chemistry
If the wavelength if determined to be 0.018 nm, at what velocity is the electron traveling? (The mass of an electron is 9.11x10^-31kg) I know the answer is 4.0x10^7 m/s, but i cannot figure how they got this. Could someone please explain it to me and show me? Thanks!!
Monday, November 11, 2013 at 10:59pm

Chemistry
If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total buffer concentration of acetic acid + sodium acetate of 0.050M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and sodium acetate with concentrations of 0.10M and...
Monday, November 11, 2013 at 10:11pm

chemistry will somebody please help!!
What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030M ? CaCO3(s)⇌CaO(s)+CO2(g)
Monday, November 11, 2013 at 9:38pm

General Chemistry : for Nursing
Im Having a really Hard time with this problem :( ---> A sample containing 5.60g O2 gas has a volume of 31.0L . Pressure and temperature remain constant. 1 .) Oxygen is released until the volume is 8.00L . How many moles of O2 are removed?
Monday, November 11, 2013 at 9:36pm

chemistry
Phosphorus pentachloride, PCl5, reacts with water to form phosphoric acid, H3PO4, and hydrochloric acid, HCl. PCl5(s) + 4H2O() → H3PO4(aq) + 5HCl(aq) (a) What mass of PCl5 is needed to react with an excess quantity of H2O to produce 23.5 g of H3PO4? (b) How many ...
Monday, November 11, 2013 at 8:49pm

Chemistry
Dr Bob!! Need your help!!
Monday, November 11, 2013 at 8:29pm

chemistry
same question as before What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030M ? CaCO3(s)⇌CaO(s)+CO2(g)
Monday, November 11, 2013 at 8:21pm

Chemistry
Hi, I'm a little stuck on this problem: Find the pH of the Hydrochloric acid solution when 5.0 mL of concentrated HCl, with a specific gravity of 1.18 and has 37% (w/w) purity is diluted to 2.0L
Monday, November 11, 2013 at 8:08pm

chemistry
What mass of NiSO4 is present in 2.00 x 102ml of 6.00% NiSO4(aq)? (The density of the solution is 1.13g/ml.)
Monday, November 11, 2013 at 6:51pm

CHEMISTRY
Please explain the answer. Which statement about this reaction is correct? 2Fe(s)+3CO2(g)--->Fe2O3(s)+3CO(g) delta H = 26.6 kJ A. 26.6 kJ of energy are released for every mole of Fe reacted B. 26.6 kJ of energy are absorbed for every mole of Fe reacted C. 53.2 kJ of energy ...
Monday, November 11, 2013 at 6:40pm

CHEMISTRY
Please explain. The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 C2H2+2H2---->C2H6 Delta H 2 Which expression represents the enthalpy change for the reaction below? C2H4+H2---->C2H6 Delta H = ? A. Delta H 1 + Delta...
Monday, November 11, 2013 at 6:39pm

CHEMISTRY
Please explain. The average bond enthalpy for the C-H bond is 412 kJ mol^-1. Which process has an enthalpy change closest to this value ? A. CH 4 (g)---> C(s)+2H2(g) B. CH 4(g)--> C(g)+2H2(g) C. CH 4(g)---> C(s)+ 4H(g) D. CH 4 (g)---> CH3(g)+ H(g)
Monday, November 11, 2013 at 6:34pm

Quantitative Chemistry
Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 4.36. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.
Monday, November 11, 2013 at 5:38pm

Chemistry
Please explain. The average bond enthalpy for the C-H bond is 412 kJ mol^-1. Which process has an enthalpy change closest to this value ? A. CH 4 (g)---> C(s)+2H2(g) B. CH 4(g)--> C(g)+2H2(g) C. CH 4(g)---> C(s)+ 4H(g) D. CH 4 (g)---> CH3(g)+ H(g)
Monday, November 11, 2013 at 5:36pm

Chemistry
Please explain. The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 C2H2+2H2---->C2H6 Delta H 2 Which expression represents the enthalpy change for the reaction below? C2H4+H2---->C2H6 Delta H = ? A. Delta H 1 + ...
Monday, November 11, 2013 at 5:29pm

chemistry
What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030M ? CaCO3(s)⇌CaO(s)+CO2(g)
Monday, November 11, 2013 at 5:21pm

Chemistry
Please explain the answer. 1. Which statement about this reaction is correct? 2Fe(s)+3CO2(g)--->Fe2O3(s)+3CO(g) delta H = 26.6 kJ A. 26.6 kJ of energy are released for every mole of Fe reacted B. 26.6 kJ of energy are absorbed for every mole of Fe reacted C. 53.2 kJ of ...
Monday, November 11, 2013 at 5:20pm

Chemistry
Assuming complete dissociation, what is the pH of a 3.73 mg/L Ba(OH)2 solution?
Monday, November 11, 2013 at 3:54pm

Chemistry
After 53.0 min, 14.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?
Monday, November 11, 2013 at 3:41pm

AP Chemistry
How do you determine the heat of solution for a substance? how can we report this answer in both kJ/g and kJ/mol? thank you!!!
Monday, November 11, 2013 at 2:23pm

chemistry
Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->
Monday, November 11, 2013 at 1:35pm

chemistry
What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2
Sunday, November 10, 2013 at 6:57pm

chemistry
What mass of ammonia is produced when 1.48 L of nitrogen (at STP) react completely in the following equation? N2 + 3H2 --> 2NH3
Sunday, November 10, 2013 at 6:56pm

Chemistry
A sample of unknown metal has a mass of 36.7 g. This metal was placed in boiling water at 96.0oC until the metal had reached the temperature of the water. The metal was then placed in a foam cup with 50.0 g of water in it at 20.0oC. The cup absorbs 42.0 J/oC, and the ...
Sunday, November 10, 2013 at 6:55pm

chemistry
A 0.411 mol sample of PCl5(g) is injected into an empty 4.65 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.kc=1.80 at 250c
Sunday, November 10, 2013 at 6:28pm

chemistry
What is the the energy (in kJ/mol) of infrared radiation that has a frequency of 3.809e+13 Hz? The speed of light is 3.00x108 m/s and Planck's constant is 6.626x10-34 J*s. So i know the equation we use is E= hc/wavelength but i keep getting the wrong answer. And also, how ...
Sunday, November 10, 2013 at 4:48pm

Chemistry
Heisenberg's uncertainty principle can be expressed mathematically as Δx*Δp = h/4π, where Δx and Δp denote the uncertainty in position and momentum respectively and h is Planck's constant. What would be the uncertaintry in the position of a ...
Sunday, November 10, 2013 at 4:48pm

Chemistry
What is the mass of a fly in grams if its de Broglie wavelength is 1.545e-31 m when it is traveling at a velocity of 3.605 m/s
Sunday, November 10, 2013 at 4:47pm

Chemistry
Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (...
Sunday, November 10, 2013 at 4:46pm

Chemistry
Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (...
Sunday, November 10, 2013 at 4:46pm

Chemistry
For the reaction Zn(OH)2(s)+4CN-(aq)->Zn(CN)4 2-(aq)+2OH-(aq) find [CN-] when 8.5 g of Zn(OH)2 are dissolved in 1.00 L of solution.
Sunday, November 10, 2013 at 4:13pm

Chemistry
When excess NaOH is added to Zn(OH)2, the complex ion Zn(OH)4 2- is formed. Determine the molar solubility of Zn(OH)2 in .10 M NaOH. Compare with the molar solubility of Zn(OH)2 in pure water. I thought I knew how to do this problem, but I'm not getting the right answer. ...
Sunday, November 10, 2013 at 3:47pm

chemistry
Heisenberg's uncertainty principle can be expressed mathematically as Δx*Δp = h/4π, where Δx and Δp denote the uncertainty in position and momentum respectively and h is Planck's constant. What would be the uncertaintry in the position of a fly...
Sunday, November 10, 2013 at 3:43pm

chemistry
Heisenberg's uncertainty principle can be expressed mathematically as Δx*Δp = h/4π, where Δx and Δp denote the uncertainty in position and momentum respectively and h is Planck's constant. What would be the uncertaintry in the position of a fly...
Sunday, November 10, 2013 at 3:42pm

chemistry
Hydrogen exhibits several series of line spectra in different spectral regions. For example the Lyman series (nf = 1 in Balmer-Rydberg equation) occurs in the ultraviolet region while the Balmer (nf = 2) series occurs in the visible range and the Paschen (nf = 3), Brackett (nf...
Sunday, November 10, 2013 at 3:39pm

chemistry
What is the mass of a small car in grams if its de Broglie wavelength is 4.198e-38 m when it is traveling at a velocity of 11.84 m/s ?
Sunday, November 10, 2013 at 3:38pm

chemistry
Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
Sunday, November 10, 2013 at 1:14pm

chemistry
Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
Sunday, November 10, 2013 at 12:45pm

chemistry
Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 616 mmHg. (R=0.082 L-atm/K mol)
Sunday, November 10, 2013 at 12:45pm

Chemistry
A compound containing only boron, nitrogen, and hydrogen was found to be 40.3% B, 5202% N, 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degree celsius. if the freezing point depression constant/cryoscopic ...
Sunday, November 10, 2013 at 12:28am

chemistry
Determine the energy of a photon with a wavelength of 6.74 ✕ 102 nm.
Saturday, November 9, 2013 at 8:53pm

Chemistry
How much water would be formed if 2.4 grams of hydrogen reacted with 19.3 grams of oxygen?
Saturday, November 9, 2013 at 7:55pm

Chemistry
Use standards entropies and heats of formation to calculate delta Gf at 25C for a. cadmium (II) chloride (s) b. methyl alcohol, CH3OH (l) c. copper (I) sulfide (s) I really have no idea where to start with this problem. I have no idea how to calculate delta Gf, and everything ...
Saturday, November 9, 2013 at 7:41pm

Chemistry
Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->
Saturday, November 9, 2013 at 5:59pm

Chemistry
A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?
Saturday, November 9, 2013 at 3:03pm

chemistry
For the following chemical reaction write the net ionic equation, including the phases. 2HBr (aq) +Ba(OH)2(aq) --> 2H2O(l) +BaBr2 (aq)
Saturday, November 9, 2013 at 1:38pm

chemistry
A solution prepared by mixing 47.1 mL of 0.4 M AgNO3 and 47.1 mL of 0.4 M TlNO3 was titrated with 0.8 M NaBr in a cell containing a silver indicator electrode and a reference electrode of constant potential 0.175 V. The reference electrode is attached to the positive terminal ...
Saturday, November 9, 2013 at 5:45am

Chemistry
I need help I can't seem to get the right answer. Please help! 1/2 H_2 (g) + 1/2 Cl_2 (g) --> HCl (g) -92.3 kJ/mol Na(s) + 1/2 O_2(g) + 1/2H_2(g) --> NaOH(s) -426.8 kJ/mol NaCl(s) --> Na(s) + 1/2Cl_2(g) 411.1 kJ/mol H_2O(l) -->H_2(g) + 1/2O_2(g) 285.8 kJ/mol ...
Friday, November 8, 2013 at 9:22pm

Pages: <<Prev | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members