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February 9, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths greater than about 3 mm. What is the frequency of radiation of wavelength 13.82 mm?
Tuesday, October 20, 2015 by C

Chemistry DR BOB help!!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? (thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side. Should the enthalpy change for ...
Tuesday, October 20, 2015 by patrick

Chemistry DR BOB help!!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? (thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side. Should the enthalpy change for ...
Tuesday, October 20, 2015 by patrick

chemistry
Calculate the volume, in milliliters, of a 0.290 M LiOH solution that will completely neutralize each of the following: a. 40.0 mL of a 0.130 M H3PO4 solution b. 24.5 mL of a 0.535 M H2SO4 solution
Tuesday, October 20, 2015 by Chris

chemistry
If 5.00 g of PCl5 is reacted with excess water, how many grams of H3PO4 and HCl would be produced?
Tuesday, October 20, 2015 by tricia

chemistry
What is the unbalanced equation for the combustion reaction of gaseous C4H10 and gaseous oxygen to form gaseous carbon dioxide and gaseous water?
Monday, October 19, 2015 by vincent

chemistry
prepare a phosphate buffer with pH= 7 from solid NaH2PO4 (pKa =7.21) and Na2HPO4. 1) calculate the ratio of [CB]/[acid] I got the ratio as 0.62 2) calculate the mass of each component required to make 1L of a .1 M buffer solution 3) if the pH is 7.10, how would you adjust it ...
Monday, October 19, 2015 by prepare a phosphate buffer with pH= 7

chemistry please help!
Calculate the enthalpy of the reaction of boron trioxide with steam: B2O3(s) + 3H2O(g) → 3O2(g) + B2H6(g) Given: H2O(l) H2(g) + 1⁄2 O2(g) 2B(s) + 3H2(g) 2B(s) + 3/2 O2(g) → B2O3(s) → H2O(g) → H2O(l) → B2H6(g) 44 kJ/mol -286 kJ/mol 36 kJ/mol...
Monday, October 19, 2015 by Lay

chemistry
Nitroglycerin is shock sensitive, and decomposes explosively: 4C3H5N3O9(l) → 12CO2(g) + 6N2(g) + O2(g) + 10H2O(g) ΔHf° -370 -393.5 -241.8 a. What is the molar enthalpy of decomposition (detonation) of nitroglycerin? b. Calculate the change in internal energy (&#...
Monday, October 19, 2015 by Lay

chemistry
10mL of 0.500M HCl was added to 50mL of 0.100M NaOH in a coffee cup calorimeter, and the temperature increased from 22.3°C to 23.1°C. What is the experimentally determined enthalpy of neutralization of HCl (in kJ/mol)? The specific heat of water is 4.184J/g•°C...
Monday, October 19, 2015 by Lay

chemistry
Nitromethane (CH3NO2) is a liquid fuel that is used in top fuel drag racing and model airplane engines. A 0.57g sample of nitromethane was placed in the constant volume (bomb) calorimeter. The temperature of the calorimeter rose from 23.25°C to 24.73°C. What is the ...
Monday, October 19, 2015 by Lay

chemistry
A constant volume (bomb) calorimeter was calibrated in an analytical laboratory by burning 1.057g of benzoic acid (C7H6O2) which has an enthalpy of combustion of -3228 kJ/mol. The temperature of the calorimeter rose from 22.75°C to 29.00°C. What is the heat capacity of...
Monday, October 19, 2015 by Lay

chemistry
Can a substance,that cannot be electrolysed,conduct electricity?Why?
Monday, October 19, 2015 by sujal

CHEMISTRY!!!
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
Monday, October 19, 2015 by Allie

Organic Chemistry
Why is methylene chloride (dichloromethane) used to extract eugenol from cloves, and not toluene?
Monday, October 19, 2015 by Sasha

Chemistry
If you add 14g of Hydrogen to excess oxygen, how much water should form?
Monday, October 19, 2015 by michael

Chemistry
when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy change?
Monday, October 19, 2015 by Al

Chemistry
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
Monday, October 19, 2015 by Allie

Chemistry
When methane is combusted with excess oxygen 891 kJ of energy is produced start with 100g of methane. how much energy is produced? is this reaction endothermic or exothermic? Also provide enthalpy change for this reaction: CH4 + 2O2 (arrow)= CO2 + H2O + 891 kJ
Monday, October 19, 2015 by Al

chemistry!!!!!!!!!
at 20°C the concentration of O2 in the air is 8.65 x10-3 mol/L. what us the minimum volume of air in litres that are required to completely combust on e litre of gasoline at 20°C? Assume the gasoline is octane which has a density of .703 g/mol at this temperature. The ...
Monday, October 19, 2015 by alyssa

chemistry
1.) How many carbon atoms are contained in a 1.500 carat diamond (carbon) if 1 caret =200.0 mg? _____________________________ I don't know if I'm doing this right but I tried. Can someone help? 1.500 carat diamond (C) *(200.0 mg/1 caret) ... ...
Monday, October 19, 2015 by Allie

Chemistry
Write a balanced net ionic reaction for the reduction of cupric ion (Cu2+) by hydroxylamine (NH2OH) in acid solution, using the smallest integer coefficients. (Do not include symbols for state of matter in your answer). in order for this to reduce Cu+2 to Cu+, the ...
Monday, October 19, 2015 by Joseph

Chemistry
Why does the temperature in exothermic reactions increase, reach a maximum, and then decrease?
Monday, October 19, 2015 by Lena

Chemistry
Would there be any effect on the amount of precipitate of CaCO3 if tap water contained Ca 2+ were used? Explain.
Monday, October 19, 2015 by Renee

CHM 312L
Experiment: Thermodynamics of Real Gases Chemistry 311L (Heat Capacity Ratio and the Joule-Thomson Effect) question: Imagine that you forget that an oil manometer measures pressures above atmospheric. What will happen to your calculated heat capacity ratios, and why?
Monday, October 19, 2015 by nina

chemistry
The pressure of a mixture of H2 & N2 in container in 1200 torr.The partial pressure of N2 in the mixture is 300 torr.What is the ratio of H2 and N2 molecules in the mixture torr?
Monday, October 19, 2015 by Randeep

Chemistry
What would happen to the peaks on your chromatogram for substances that do not separate?
Monday, October 19, 2015 by Andrew

Chemistry
Which substances are not ionized in a aqueous solution? Hi, KBr, H2SO4, HNO2, AgCl, Ca(NO3)2
Monday, October 19, 2015 by Chelsea

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Monday, October 19, 2015 by Ash

Chemistry
A 10.0 mL aliquot of a flouride sample solution was diluted to 250 mL in a volumetric flask. The F- concentration of this DILUTED sample was determined with a F- ion selective electrode and found to be 7.1 mg/L. What is the concentration of F- in the original, undiluted sample...
Monday, October 19, 2015 by Ronnie

chemistry
What would happen to the peaks on your chromatogram for substances that do not separate? How are transmittance values are affected by the amount of sample on your salt plate?
Monday, October 19, 2015 by Andrew

chemistry
the density of acetone is 0.7899 g/cm-3. If 2mL of acetone is vaporized at 84 C and atmospheric pressure, what would the volume be in liters?
Monday, October 19, 2015 by Lynn Wilson

chemistry
A voltaic cell can be built using the reaction between Al metal and O2 from the air. If the Al anode of this cell consists of 65 g of aluminum, how many hours can the cell produce 1.5 A of electricity, assuming an unlimited supply of O2?
Sunday, October 18, 2015 by maddie

Organic Chemistry
What is the solubility, in mg/mL, of a 50% water/50% methanol solution at 73.5 degrees Celsius? Is there a table available online somewhere?
Sunday, October 18, 2015 by Sasha

Chemistry
arrange CO2, N2O2, CaO, SiO2, and Ga2O3 in order of increasing acidity
Sunday, October 18, 2015 by Heather

Chemistry
How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?
Sunday, October 18, 2015 by Christina

Chemistry
A solution of NH3 in water has a pH of 11.17. Calculate it's molarity
Sunday, October 18, 2015 by Rita

Analytical Chemistry
A 10.0 mL sample of whiskey was diluted to 500.0 mL. A 4.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02150 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with 17.1 mL of 0.1275...
Sunday, October 18, 2015 by Kristin

Chemistry
A 1.50 g sample of glucose (C6H12O6) is burned in a bomb calorimeter that contains water at 25.0 0C. The heat capacity of the bomb calorimeter is 1046 J/0C. When the glucose is combusted, the temperature of the water rises to 47.4 0C. Calculate the heat of combustion of ...
Sunday, October 18, 2015 by Mark

Chemistry
A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and yields 269 mg of CO2 and ...
Sunday, October 18, 2015 by Chelsea

Chemistry
A sample of gas in a cylinder of volume 3.64 L at 275 K and 2.68 atm expands to 7.04 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J What I did was basically W=-P(delta V) Which was -(2.68 atm)(3.4...
Sunday, October 18, 2015 by Alex

chemistry-Dr BOB
Hi Dr. Bob, I first want to tank you for all your help. Secondly, I don't understand why this was marked wrong. When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of ...
Sunday, October 18, 2015 by patrick

Chemistry
What volume of 0.120 M Na3PO4 is required to precipitate all the lead(II) ions from 300.0 mL of 0.200 M Pb(NO3)2?
Sunday, October 18, 2015 by Amy

Chemistry
What volume of 0.0495 M Ba(OH)2 is required to neutralize exactly 14.87 mL of 0.136 M H3PO4? Phosphoric acid contains three acidic hydrogens.
Sunday, October 18, 2015 by Amy

Chemistry
A compound isolated from oil of mint has a characteristic cool, refreshing odour. It is frequently used in cough drops to ease the pain of a sore throat. This compound contains only C, H, and O. If 95.6 mg of this compound burns completely in O2, and yields 269 mg of CO2 and ...
Sunday, October 18, 2015 by Chelsea

Chemistry
1. The formation of water-insoluble chloride salts, especially silver(I) chloride, is useful for the analysis of compounds that contain chlorine. Consider the following unbalanced equation: _____ BaCl2(aq) + _____ AgNO3(aq) --> _____ AgCl(s) + _____ Ba(NO3)2(aq) a. Balance ...
Sunday, October 18, 2015 by Chelsea

Chemistry
1. Ammonia gas can be prepared by the following unbalanced equation: _____ CaO(s) + _____ NH4Cl (s) --> _____ NH3(g) + _____ H2O(g) + _____ CaCl2(s) a. Balance the equation. CaO + 2NH4Cl = 2NH3 + H2O + CaCl2 b. Suppose you begin this reaction with 112. grams of CaO and 224...
Sunday, October 18, 2015 by Chelsea

Chemistry
2Fe2O3 + 6C + 3O2 -> 4Fe + 6Co2 What mass of Fe2O3 present is needed to produce 15 of iron? what mass of CO2 is released when 15g of iron is produced?
Sunday, October 18, 2015 by Al

Chemistry
List Sn , Sn2+, Sn4+ in order of decreasing ionization energy
Sunday, October 18, 2015 by Al

Chemistry
rank the gases Ar, N2,CH4, and C2H6 in order of the increasing density at STP answer: CH4<N2<C2H6<Ar please help me solve this
Sunday, October 18, 2015 by Mark

Chemistry
Consider the generic reaction: 2 A(g)+ B(g)--> 2C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what will be the pressure in the flask if the reaction proceeds to completion? (Assume constant volume and temperature.) answer is 1.5atm how do you solve this
Sunday, October 18, 2015 by Mark

Chemistry!!!!!!!!
A sample of Xe takes 75 seconds to effuse out of a container. An unknown gas takes 37 seconds to effuse out of the identical container under identical conditions. What is the most likely identity of the uknown gas the answer is O2. How do you solve this?
Sunday, October 18, 2015 by Mark

Chemistry
Element X has the highest first electron affinity in its period; the ground state electron configuration of it's most common ion is [Kr] 5s^2 4d^10 5p^6 a Element Y is the second largest element in it's period; it's valence electrons are in orbital(s) that have n=6...
Sunday, October 18, 2015 by Al

Chemistry
An unknown compound contains only C, H, and O. Combustion of 4.40 g of this compound produced 10.4 g of CO2 and 2.83 g of H2O.
Sunday, October 18, 2015 by Anonymous

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Sunday, October 18, 2015 by Ash

Chemistry
A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
Sunday, October 18, 2015 by Ash

Chemistry
which gas has the greatest kinetic energy at STP? a)He b)Ne c)Ar d) None of the above(All have the same kinetic energy) how do I solve for this?
Sunday, October 18, 2015 by Mark

Chemistry
A gas sample at STP contains 1.15 oxygen and 1.55g nitrogen. What is the volume of the gas sample? the answer 2.04. I want to know how to get the that answer
Sunday, October 18, 2015 by Mark

Chemistry
Name the organic product of the following nucleophilic substitution reaction OH-+CH3I
Sunday, October 18, 2015 by Lily

College Chemistry
the acid dissociation constant for acetic acid is 1.85x10^-5. Calculate the pH at the equivalent point and the pH at one-half the equivalence point for the titration of 25.00 mL of 0.100 M acetic acid with 0.100 M NaOH?
Sunday, October 18, 2015 by Courtney

chemistry Dr. Bob
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Sunday, October 18, 2015 by patrick

chemistry-Dr Bob
is that a -56? Dr. BOb. thank you When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and...
Sunday, October 18, 2015 by patrick

chemistry
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Sunday, October 18, 2015 by patrick

Chemistry- Dr. Bob
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
which gas sample has the greatest volume at STP? a)10.0g Ar b)10.0g Kr c) 10.0 g Xe d) none of the above (They all have the same number)
Saturday, October 17, 2015 by Mark

Chemistry
A 255mL gas sample contains argon and nitrogen at a temperature of 65 degrees celsius. The total pressure of the sample is 725mmHg and the partial pressure of argon is 231 mmHg. what mass of nitrogen is present in the sample?
Saturday, October 17, 2015 by Mark

Chemistry
A gas mixture in a 1.55L at 298K container contains 10.0g Ne and 10.0g Ar. Calculate the partial pressure " in atm" of Ne and Ar in the container
Saturday, October 17, 2015 by Mark

chemistry
Use a balanced redox equation to answer the following question. 71.7 mL of 1.13 x 10-4 mol L-1 potassium ferricyanide solution is required to react completely with 43.9 mL of ascorbic acid solution (under acidic conditions). What is the concentration of the ascorbic acid ...
Saturday, October 17, 2015 by hm

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
Convert: 10 cm = ? m Convert your answer to scientific notation.
Saturday, October 17, 2015 by Anonymous

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

chemistry
Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to include the physical ...
Saturday, October 17, 2015 by patrick

chemistry
is that a -56? Dr. BOb. thank you When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and...
Saturday, October 17, 2015 by patrick

Chemistry
A student dissolved 1.62 g of calcium bicarbonate into 500. mL of water. Excess amount of hydrobromic acid was then added to the solution until bubbling stopped. At STP, what approximate volume (in L) of the gaseous compound would be produced in this reaction?
Saturday, October 17, 2015 by May

Chemistry
A mixture of carbon and sulfur has a mass of 9.0 g. Complete combustion with excess O2 gives 29.7 g of a mixture of CO2 and SO2.Find the mass of sulfur in the original mixture.
Saturday, October 17, 2015 by Anonymous

chemistry
A mixture of carbon and sulfur has a mass of 9.0 g. Complete combustion with excess O2 gives 29.7 g of a mixture of CO2 and SO2.
Saturday, October 17, 2015 by Anonymous

chemistry
How can I collect carbon di-oxaide gas(CO2) from mixture of (SO2, CO, NO2, CO2) gases??
Saturday, October 17, 2015 by Mohammad Seyam

chemistry
∆H of ★Ca(HCO3)2→CaCO3 + CO2 + H2O and ★Ca(HSO4)2→ CaSO4+ SO2 + H2O???
Saturday, October 17, 2015 by Mohammad Seyam

Chemistry
What is the name of CrS subscript 3? Chromium (III) Sulfide? But S has a -2 charge... -2(3)=-6 Cancellation of the charge need to occur. I don't understand this.
Saturday, October 17, 2015 by Anonymous

chemistry
A particular air sample at 1 atm pressure has a density of approximately 1.3 g/liter and contains SO2 at a concentration of 25 µg/m3 . What is this concentration in terms of: a) Parts per million (mass SO2 per 106 units mass of air) b) Moles SO2 per 106 mol of air
Friday, October 16, 2015 by Mensah

chemistry/check my work I have to submit today
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry help DR. BOB
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
How many moles of sulfur are present in 2.9 moles of Al2(SO4)3
Friday, October 16, 2015 by shelly

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry Dr BOB
Am I correct? From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·&...
Friday, October 16, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Friday, October 16, 2015 by patrick

Chemistry
Construct a standard curve (absorbance vs. concentration) using the following results. A 5mL, 10mL, 15mL,20mL aliquot of 0.010M sodium salicylate solution was diluted to 100 mL in four different volumetric flasks with the Iron (III) chloride solution. The % Transmittance for ...
Friday, October 16, 2015 by Ati

Chemistry
Determine the amount of Sodium Salicylate required to make 100mL of a 0.01M stock solution. {this is from the spectrometric analysis of a commercial aspirin tablet lab}
Friday, October 16, 2015 by Ati

Chemistry
NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.049 M in NH4Cl at 25 °C?
Friday, October 16, 2015 by Todd Mike

Chemistry
Heating 1-bromobutane with 2M NaOH -> Butan-1-ol + NaBr Acidification with 2M HNO3 Then Addition of 0.1 AgNO3 dropwise What is the equation here? Also why does the mix need to be acidic before adding AgNO3?
Friday, October 16, 2015 by Daksh

chemistry
1.00 tonne of ammonium from the harber process is reacted with carbon dioxide to prepare the fertiliser urea and 1.35 tonnes of urea are formed. calculate the percentage yield of urea
Friday, October 16, 2015 by ellie smith

chemistry
Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my work: • 2 H2O2(...
Friday, October 16, 2015 by patrick

chemistry
When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C. Calculate delta H of this reaction. (Assume that the total volume is the sum of the individual volumes and that density and specific heat ...
Friday, October 16, 2015 by patrick

chemistry
From data below, calculate the total heat (J) needed to convert 0.539 mol gaseous ethanol at 300°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. Boiling point at 1 atm 78.5°C c ethanol gas 1.43 J/g·°C c ethanol liquid 2.45 J/g·°C ÄH&...
Friday, October 16, 2015 by patrick

chemistry
flow diagram of extraction acid base organic
Friday, October 16, 2015 by Anonymous

Chemistry
A buffer is made by dissolving H3PO4 and NaH2PO4 in water. 1. Write an equation that shows how this buffer neutralizes added acid. Express your answer as a chemical equation. Identify all of the phases in your answer. 2. Write an equation that shows how this buffer neutralizes...
Friday, October 16, 2015 by Mernyshia

Organic Chemistry
When reading an infrared (IR) spectrum for an unknown compound, you check for certain functional groups in a certain order. If C=O is absent, you check for alcohols/phenols (-OH), then for amines (N-H), then for ethers (C-O, & the absence of -OH). So, I was wondering: If you ...
Friday, October 16, 2015 by Sasha

chemistry
A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 mL of 0.100 M hydrochloric acid, 100.0 mL of 0.200 M of nintric acid,500. mL of 0.0100 M calcium hydroxide, and 200.0 mL of 0.100 M rubidium ...
Thursday, October 15, 2015 by ana

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