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February 9, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
the distance from the sun to earth is 1.496 x10 ^8 km. how long does it take light to travel from the sun to earth How do you solve this?
Sunday, October 25, 2015 by Mark

CHEMISTRY!!
1) How would you prepare 20 mL of a solution having pH = 2.00 by dilution of 0.10 M HCl? 2) The Ka, for hypochlorous acid, HClO, is 7.2 x l0^–4 at 25°C. What is pKa? Write the equation for the reaction to which Ka applies.
Sunday, October 25, 2015 by jess

Chemistry
The question says: A sample of helium is collected by displacing 182 mL of water. The pressures of the gas and the atmosphere are equalized, using the method described in this experiment. The atmospheric pressure is 738 mmHg. The temperature of the water and that of the gas ...
Sunday, October 25, 2015 by Heather

Chm101 introductory inorganic chemistry
The abundant metal in sea is
Sunday, October 25, 2015 by Ekom

chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
Sunday, October 25, 2015 by Mark

College Chemistry
Suppose 15.0 grams of solid sodium hydroxide solid at 20.5 oC is dropped into 120 grams of water in a container that has a heat capacity of 10.0 J/oC, temperature also 20.5 oC. A solution that has a density of 1.04 g/mL forms at a temperature of 38.0 oC. What is the heat of ...
Sunday, October 25, 2015 by Matt235

Chemistry
What is the concentration of Fe(III) with a stock concentration of .00025 M in a solution of 1 ml FeCl3 and 9 ml of HCl? 2 ml of FeCl3 and 8 ml of HCl? 3 ml of FeCl3 and 7 ml of HCl? 4 ml of FeCl3 and 6 ml of HCl? 5 ml of FeCl3 and 5 ml of HCl? I got .000025 .00005 .000075 ....
Sunday, October 25, 2015 by Dan

chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
Sunday, October 25, 2015 by Mark

Chemistry
2 NO + 2 SO2 → 1 N2 + 2 SO3 Determine the mass (in g) of N2 that would be produced when 5.28×10-3 g of SO2 reacts with an excess of NO.
Sunday, October 25, 2015 by Mackenzie

Chemistry
4 Questions on molarity that I really don't understand. I have the formulas, but they don't seem to fit in to the question right. Please take a look, thanks! 1. Calculate the weight, in grams, of HNO3 present in 1.0 litre of 0.10M of solution. 2. What is the ...
Sunday, October 25, 2015 by Bethany

Chemistry -Dr.Bob
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1ppm arsenic (As)? DrBob222 1 ppm = 1 mg/L and although that isn't by mass...
Sunday, October 25, 2015 by Tiffany

Chemistry
How do I find the number of grams of .25 moles of neon?
Sunday, October 25, 2015 by Anonymous

Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
Saturday, October 24, 2015 by Mark

Chemistry
Calculate the change in internal energy of the following system: A 100.0-g bar of gold is heated from 25 C to 50 C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains constant.
Saturday, October 24, 2015 by yana

Chemistry
How many nanoliters of a 1.00 molar solution would be required to react with 5.00 grams of barium nitrate?
Saturday, October 24, 2015 by Frank

Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(...
Saturday, October 24, 2015 by Mark

Chemistry
What mass of liquid water at room temperature (25◦C) can be raised to its boiling point with the addition of 43.0 kJ of energy? Answer in units of g.
Saturday, October 24, 2015 by Nicole

Chemistry
3490 J of heat are added to a 20.4 g sample of iron at 20◦C. What is the final temperature of the iron? The specific heat of iron is 0.449 J/g · K. Answer in units of K.
Saturday, October 24, 2015 by Nicole

Chemistry
Energy in the amount of 479 J is added to a 89.0 g sample of water at a temperature of 8.00◦C. What will be the final temperature of the water? Answer in units of ◦C.
Saturday, October 24, 2015 by Nicole

Chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Saturday, October 24, 2015 by Mark

chemistry
An aqueous solution contains three solutes. One liter contains: 0.200 moles of calcium chloride, 0.150 moles of magnesium chloride, and 0.750 moles of sodium chloride. How many grams of Cl are there per liter of this solution? a. 39.0 g b. 51.4 g c. 78.0 g d. 80.3 g e.103 g
Saturday, October 24, 2015 by Lisa

chemistry
an acid-base neutralization is the reaction of a)H2(g) with O2(g) to form H2O(l) b)H2(aq) with OH-(aq) to form H2O(l) c)H+(aq) with o2(g) to form H2O(l) d)H+(aq) with OH-(aq) to form H2O(l) e)Na+(aq) with OH-(aq) to form NaOh(aq)
Saturday, October 24, 2015 by Lisa

Chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Saturday, October 24, 2015 by Mark

chemistry
The molar heat capacity of Al is 24.4j/mol. How much heat is required to heat 100g of Al from 20 to 80? Al=27
Saturday, October 24, 2015 by Komolafe

chemistry
1.43.4 kcal of heat is required to decompose 2 mole of mecury(II) oxide according to the equation 2HgO(s)➡2Hg(l) + O⬇2(g) . What quantity of energy is required to decompose 10.8g of HgO ? (Hg=200.59, O=16)
Saturday, October 24, 2015 by Komolafe

chemistry
In a standardization titration involving hydrochloric acid and sodium carbonate, a student recoirded the following results for the volume of hydrochloric acid used against 10.00mL of the sodium carbonate solution : 15.60; 14.50; 14.70 aqnd 14.20. If the c.......... i do not ...
Saturday, October 24, 2015 by mije

Chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Saturday, October 24, 2015 by Mark

chemistry
home / study / questions and answers / science / chemistry / a chemical engineer studying the properties of ... Question A chemical engineer studying the properties of fuels placed 1.760 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas The bomb was ...
Friday, October 23, 2015 by patrick

Chemistry
Use the van der Waals equation of state to calculate the pressure of 3.60 mol of NH3 at 489 K in a 4.50-L vessel. Van der Waals constants can be found here. P= Use the ideal gas equation to calculate the pressure under the same conditions. P= I have tried absolutely everything...
Friday, October 23, 2015 by Anna

chemistry
When 1 mol of NO(g) forms from its elements, 90.29 kJ of heat is absorbed, How much heat is involved when 4.29 g of NO decomposes to its elements? is it -12.90 kJ ??? thank you.
Friday, October 23, 2015 by patrick

chemistry
When 24.30mL of .5 M H2SO4 is added to 24.30 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 23, 2015 by patrick

chemistry
Whenever organic matter is decomposed under oxygen free conditions, methane is one of the products. Thus enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry (dHrxn for the combustion of CH4 = -802 kJ/mol.) ...
Friday, October 23, 2015 by patrick

Chemistry
Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: H2SO4(l) "arrow" H2SO4(aq) + heat a) Find the ÄHo for diluting 1.00 mol of H2SO4(l) (d = 1.83 g/mL) to 1 L of 1.00 M H2SO4(aq) (d = 1.060 g/mL). Suppose...
Friday, October 23, 2015 by patrick

chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

Chemistry
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1ppm arsenic (As)?
Friday, October 23, 2015 by Tiffany

Chemistry
How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?
Friday, October 23, 2015 by Brian

Chemistry
Why is it important to not let the wooden split burn ?
Friday, October 23, 2015 by Ken

Chemistry
Do positive ions or the negative ions cause the change in flame color ? Explain why and give on example.
Friday, October 23, 2015 by John

Chemistry
1. Use the following balanced net ionic equation to determine the volume of 6.0 M HNO3 needed to react completely with 5.00 g of copper. 8H+(aq) + 2NO3-(aq) + 3Cu(s) → 2NO(g) + 4H2O(l) + 3Cu2+(aq)
Friday, October 23, 2015 by Maddie

Chemistry
Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions necessary in a ...
Friday, October 23, 2015 by Wilson

Chemistry
How many grams of oxygen gas must react to give 2.70 g of ZnO? 2Zn(s)+O2(g)→2ZnO(s) Express your answer with the appro
Friday, October 23, 2015 by Rachel

chemistry
Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: H2SO4(l) "arrow" H2SO4(aq) + heat a) Find the ÄHo for diluting 1.00 mol of H2SO4(l) (d = 1.83 g/mL) to 1 L of 1.00 M H2SO4(aq) (d = 1.060 g/mL). Suppose...
Friday, October 23, 2015 by patrick

chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

Chemistry
#7 Charcoal briquettes consist almost entirely of elemental carbon. When they burn in the open air, carbon monoxide and carbon dioxide are produced. Write balanced chemical equations illustrating the production of each combustion product.
Friday, October 23, 2015 by Royce

Chemistry
1) When aqueous solutions of cupric chloride and sodium phosphate are mixed, solid cupric phosphate separates from a solution of sodium chloride. 2) When heated in an aqueous solution of ammonium acetate, calcium oxide reacts to form calcium acetate, ammonia, and water Write ...
Friday, October 23, 2015 by Deanna

chemistry
Use the following information to find Hf of butanol [C4H9OH(l)]. C4H9OH(l) + 6 O2(g) 4 CO2(g) + 5 H2O(g) Hcomb = -2712.9 Hf of CO2(g) = -393.5 kJ/mol Hf of H2O(g) = -241.8 kJ/mo
Friday, October 23, 2015 by mara

chemistry
Calculate H0rxn for each of the following using data from Appendix B. (a) 2 H2S(g) + 3 O2(g) 2 SO2(g) + 2 H2O(g) b) CH4(g) + Cl2(g) CCl4(l) + HCl(g) [unbalanced]
Friday, October 23, 2015 by mara

chemistry
Calculate Hrxn for the reaction below. 2 NOCl(g) N2(g) + O2(g) + Cl2(g) You are given the following set of reactions. 1/2 N2(g) + 1/2 O2(g) NO(g) H = 90.30 kJ NO(g) + 1/2 Cl2(g) NOCl(g) H = -38.6 kJ
Friday, October 23, 2015 by mara

chemistry
Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 132 kJ is given off per mole of C2H4 reacting, how much ...
Friday, October 23, 2015 by mara

chemistry
A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ (a) How much heat is needed to decompose 556 g of the oxide? (b) If 288 kJ of heat is absorbed, how many grams of mercury form?
Friday, October 23, 2015 by mara

chemistry
A 30.5 g sample of an alloy at 94.8°C is placed into 52.1 g water at 22.8°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the ...
Friday, October 23, 2015 by mara

chemistry
One piece of copper jewelry at 104°C has exactly twice the mass of another piece, which is at 43.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387 J/gK)?
Friday, October 23, 2015 by mara

Chemistry: gas law
I'm here at a study group with Aaron and while he's stuck on that question, I'm stuck on this one... I think we're gonna take a break but I'd love if someone could help break this down for me. Carbon monoxide, CO, and hydrogen, H , react according to the ...
Friday, October 23, 2015 by sydney

Chemistry
Now, my problem with this question is the break-down, I don't know where to start. Calculate the volume of H (g), measured at 21.9°C and 769 Torr required to react with 36.3 L CO(g), also measured at 21.9°C and 769 Torr. Assume the gases react as follows. 3CO(g) + ...
Friday, October 23, 2015 by Aaron

Chemistry
2 NH ClO (s) ---> 4 H O(g) + Cl (g) + 2 O (g) + N (g) In an experiment, 4.56 g NH ClO decomposes completely in a rigid 5.00-L container. What is the total pressure in the container if the final temperature is 229 C? Give your answer in atmospheres, accurate to three ...
Friday, October 23, 2015 by Denice

Chemistry
Write the following into a balanced equation. a) When a mixture of copper (II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. b) When a concentrated solution of sodium hydroxide is added to an aqueous solution of lead ...
Friday, October 23, 2015 by Royce

chemistry
What mass of water can be heated from 45C to 88C with 28 kj?
Friday, October 23, 2015 by brianna

Chemistry
For the following redox reaction, provide half reactions that show which species is oxidized and reduced. Indicate the species oxidized, the species reduced, the oxidizing agent and the reducing agent. 3Mg(s) + 2FeCl3(aq) 2Fe(s) + 3MgCl2(aq) *I Figure that Mg is being oxidized...
Friday, October 23, 2015 by David Jackson

chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

Chemistry
How many grams of drug X are in 10 mL of a 1:200 solution of X?
Friday, October 23, 2015 by James

Chemistry
In winemaking, the sugars in grapes undergo fermentationby yeast to yield CH3CH2OH and CO2. During cellularrespiration, sugar and enthanol are "burned" to water vapor andCO2. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion...
Friday, October 23, 2015 by Mark

chemistry
if there is 10.0g of CO2 in a 20.0L cylinder @ pressure of 0.300 atm and im finding temperature of the CO2 sample does n=10.0g in the equation and should I set it up pv=nRT
Thursday, October 22, 2015 by amy

Chemistry Labwork
The uncertainty in each measured value of K is about + 10%. Are all of your measured values of K within the range (+ 10%) of the average K value? My K values are 343, 342, 341, and 344. My average is 342. I used 3 significant digits. How do I answer this question? I know I am ...
Thursday, October 22, 2015 by Anonymous

AP Chemistry
I'm so sorry to bother you guys again! Stuck on two other questions: 1. In the following equilibrium: NaCl(s) Na+(aq) + Cl–(aq), would adding more NaCl(s) increase the Cl-(aq) concentration? Explain why. My thoughts: I thought that it wouldn't increased the Cl- ...
Thursday, October 22, 2015 by Allie

Chemistry(MOLEDAY)
I created my Mole: MOLE'YMPICS *(Olympics)*... That is my Mole-word or Phrase but Idk if my descriptive caption below would be a phrase. I don't know what my descriptive caption could be. Or at least Idk how to make it FUNNY or HUMOROUS? My original Descriptive caption...
Thursday, October 22, 2015 by Sophia

DMMS
Chemistry What characteristics are shared by all alkali metals and alkaline earth metals? A They conduct electricity very well B They are strong and shiny C They form alkaline solutions when mixed with water D They do not react with water at all
Thursday, October 22, 2015 by Donna

chemistry
How many kJ of energy are released when 2 moles of NO reacts with an excess of ozone O3? How many kJ of energy are released when 44.9 g of NO react with an excess of ozone O3? What is the ΔH for the reverse reaction?
Thursday, October 22, 2015 by Anonymous

Chemistry
Are my answers correct? Calculate the molarity: a) 0.500 mol of NaOH in 2.45 L of solution. b) 24.1 g of NaCl in 853 mL of solution. a: 0.2 M b: 0.49 M
Thursday, October 22, 2015 by Robert

chemistry
The complete combustion of ethanol, C2H5OH (FW = 46.0 g/mol), proceeds as follows: C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔH = −555 kJ What is the enthalpy change for combustion of 15.0 g of ethanol
Thursday, October 22, 2015 by sharon

Chemistry
A gas has a volume of 2.5 L at 25 degrees Celsius and 742 mmHg. Calculate the volume at 55 degrees celsius and 825 mmHg. I got 2.5 L again. Is that possible?
Thursday, October 22, 2015 by David D.

Chemistry
1. Cisplatin is an anti tumor agent. It has the molecular formula Pt(NH3)2Cl2. How many grams of cisplatin can be produced if the limiting reactant is 1 kg of platinum? I got 1538.1 g Pt(NH3)2Cl2. 2. Hydrogen cyanide is used in the production of cyanimid fertilizers. It is ...
Thursday, October 22, 2015 by Anonymous

Chemistry
1. If you had 1.73 moles of hydrogen (H2) and 0.89 moles of oxygen (O2), which would be the limiting reactant? How many moles of water can you produce from your supply of hydrogen and oxygen? My answers: H2 is the limiting reactant because it produces the least amount of ...
Thursday, October 22, 2015 by Anonymous

Chemistry
Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3 NO2 (g)+ H2O (l) --> 2HNO3 (l) + NO (g) Suppose that 5 mol NO2 and 1 mol H2O combine and react completely. How many moles of the reactant in excess are present after ...
Thursday, October 22, 2015 by Anonymous

chemistry
what is the
Wednesday, October 21, 2015 by brandy

chemistry
what is the pH of .001M solution of acid (pKa=3)
Wednesday, October 21, 2015 by brandy

Chemistry
Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 59.0 g of H2SO4.
Wednesday, October 21, 2015 by Anonymous

Chemistry
What volume of 0.159 M Na3PO4 solution is necessary to completely react with 92.6 mL of 0.119 M CuCl2?
Wednesday, October 21, 2015 by Anonymous

Chemistry
if a photon of light has an energy of 2.35x10^-19 J, calculate the frequency and wave length. What solution do I use to get the answer?
Wednesday, October 21, 2015 by Nicole

Chemistry
Suppose you suspect that your unknown is either copper (II) nitrate or copper (II) sulfate. You decide to add NaOH to your known as a test reagent. Will this test distinguish between the two possibilities? If not, could you suggest a different test?
Wednesday, October 21, 2015 by Pat

Chemistry
Please check the following. 1. What is the empirical formula of the compound C6O6H14? A. C3O3H7 B. CO2H C. C12O12H28 D. COH2 My answer: A.C3O3H7 2. The diameter of an atom is approximately 1x10^-10 meter. What is the diameter in millimeters? A. 1 x10^-12 mm B. 1 x10^-13 mm C. ...
Wednesday, October 21, 2015 by Anonymous

Chemistry
A sample of calcium fluoride with a mass of 15.0 g contains 8.40 g of calcium. Assuming that the sample is pure calcium fluoride, how much calcium would be present in a 30.0 g sample? My answer: 16.8 g Ca Based on your answer and applying what you know about calcium fluoride, ...
Wednesday, October 21, 2015 by Anonymous

chemistry
An intercontinental ballistic missile (ICBM) travels at an average speed of 7.03km/sec. The missile contains 459.0Mg of fuel. The fuel is burned at a rate of 313 pounds per second. What would be the maximum distance (in km) the missile could travel until it ran out of fuel? ...
Wednesday, October 21, 2015 by tate

Chemistry
You discover a chunk of white shiny metal and want to know what it is made of. So, you have it analyzed by mass spectrometry and you see two peaks of different heights, according to the data shown below: Peak 1 - mass (amu): 106.90509 -relative peak height (%): 53.875% Peak 2...
Wednesday, October 21, 2015 by Anonymous

Chemistry
A balloon contains 7.2 L of He. Th e pressure is reduced to 2.00 atm and the balloon expands to occupy a volume of 25.1 L. What was the initial pressure exerted on the balloon? I got 0.57 ml, but the answer says 7.0 ml. I am not sure if my answer is wrong of correct?
Wednesday, October 21, 2015 by David D.

chemistry
A volume (54.2 L) of gas at 1150 mmHg is subjected to a new pressure of 3450 mmHg, at constant temperature. What volume in liters (L) does the gas now occupy
Wednesday, October 21, 2015 by casey

Chemistry
Explain the role ch3co2na in the preparation of fe(c5h7o2)3
Wednesday, October 21, 2015 by Bebe

Chemistry
an object with a mass of 24g and a volume of 32ml is most likely what substance
Wednesday, October 21, 2015 by Jennifer

Chemistry
Explain the role of CH3CO2Na n the preparation of Fe(C5H7O2)3)3
Wednesday, October 21, 2015 by Bebe

Chemistry
Explain why you are instructed to wash the collected crystals with distilled water instead of a water-methanol mixture.
Wednesday, October 21, 2015 by Bebe

Chemistry
How would using 0.42 grams CH3CO2Na times 3H2O instead of the amount called for in the procedure change the theoretical yield of Fe(C5H7O2)3? Briefly explain. We used 5 grams of CH3CO2Na times 3H2O.
Wednesday, October 21, 2015 by Anonymous

Chemistry
Briefly explain the role of CH3CO2Na in the preparation of Fe(C5H7O2)3.
Wednesday, October 21, 2015 by Anonymous

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. Im not too sure of what is reacting here to reduce the Cu2+. Help?
Wednesday, October 21, 2015 by Ronnie

Chemistry
A line in the Balmer series of hydrogen has a wavelength of 486 nm. From what state did the electron originate? In what region of the electromagnetic spectrum is this line observed?
Wednesday, October 21, 2015 by Caitlin

Chemistry
The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20°C to 100°C? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2.42 J/(g •...
Wednesday, October 21, 2015 by Derek

Chemistry
A solution is prepared by dissolving 0.1 mol of ethanoic acid (CH3COOH) in 500ml of water at 25 C. pKa of ethanoic acid is 4.7. What is the pH of the solution? I'm assuming the equation is pH = pKa + log[Base]/[Acid] but can't get it to work?
Wednesday, October 21, 2015 by Becca

organic chemistry
How to find the volume of hot water required to dissolve the mass of acid, if we have 20g of benzoic acid contaminated with 0.4g of salicylic acid? What is the mass of benzoic acid which participates when the solution is cooled to 20°C? Deduce. What is the mass of ...
Wednesday, October 21, 2015 by Anonymous

chemistry..anybody!
I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? Is this a typo?(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 ...
Wednesday, October 21, 2015 by patrick

chemistry
Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to 20°C. Deduce. 3)Calculate the mass of ...
Wednesday, October 21, 2015 by Jenny

chemistry
A runner eats granola bars for energy on her 100.0 mile run. Each bar contains 250.1 calories. She burns 96.15 calories per km that she runs. How many granola bars does she need to equal the number of calories that she burns?
Tuesday, October 20, 2015 by Anonymous

Chemistry
A liquid has a density of 4.32 pounds/gallon. What is the mass in kg of 3.201 liters of this liquid? Possible Answers: A) 1.66*10^3kg B) 23.7 kg C)8.05*10^-6kg D)0.0888kg E)1.27kg F) none of the above
Tuesday, October 20, 2015 by Tahne

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