Friday
July 31, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Physical Chemistry
The weight of one atom of uranium is 238amu. Its actual weight is ......g.
Tuesday, April 21, 2015 by Rahul

Chemistry
a student carefully measures the melting point of a solid material. she measures the range to be 81.2 - 83.7 degree. assuming she has done the measurement correctly. what can she conclude about the sample, and why
Tuesday, April 21, 2015 by Anonymous

Chemistry
Can someone please check if I have written and balanced the reaction properly? 1.In 1774 Joesph Priestley discovered oxygen by decomposing the oxide of mercury. 2HgO = 2 Hg + O2 2. Slaked lime precipitates magnesium ions from hard water. Ca(OH)2 + Mg(HCO3)2 = Ca(HCO3)2 + Mg(OH)2
Monday, April 20, 2015 by Lucina

Chemistry
You are given potassium carbonate solid and potassium sulfate. Both are white solids. How would you separate potassium carbonate and potassium sulfate?
Monday, April 20, 2015 by Anonymous

Physical Chemistry
The weight of one atom of uranium is 238amu. Its actual weight is ......g.
Monday, April 20, 2015 by Rahul

Chemistry
Can someone answer this question? The enthalpy of combustion of solid carbon to form carbon dioxide is -393.7 kJ/mol carbon, and the enthalpy of combustion of carbon monoxide to form carbon dioxide is -283.3 kj/mol CO. Use these data to calculate ∆H for the reaction. ...
Monday, April 20, 2015 by Anonymous

Laboratory Chemistry
The activity of a stock isotope is 10,000 DPM/0.10mL. If 0.25 ml of this stock is placed in 2.50 ml of water, what is the activity in the diluted specimen? My guess is that I just multiply the 10,000 DPM by the 1/10 dilution factor. I then come up with 1,000DPM/0.10ml. Does ...
Monday, April 20, 2015 by Sara

Science (Chemistry)
Why do ionic materials dissolve so well in water, but not in Hexane?
Monday, April 20, 2015 by Romika

Chemistry
2H2S(g)+3O2(g)<-->2SO2(g)+2H2O SO2(g)+Cl2(g)<-->SO2Cl2(g) I balanced so how do I find the overall equation
Monday, April 20, 2015 by kim

AP Chemistry
This is the question I am having trouble with: A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge ...
Monday, April 20, 2015 by Sarah

Chemistry
How many grams of potassium nitrate (KNO3) are required to produce 536 g of potassium nitrite (KNO2) according to the equation below? *I've tried this question for so long and I get so many different answers in the end so please help.
Monday, April 20, 2015 by Jo

Chemistry
3 NO2(g) + H2O(l)--->2 HNO3(aq) + NO(g) Suppose someone needs 25.0 kg of HNO3. How much NO2 should they start with to end up with the amount they need?
Monday, April 20, 2015 by Ajay

Chemistry
In a solution of a weak acid and its conjugate base, which condition has to be true for pH to equal pKa? The concentration of acid has to be greater than the concentration of base. The concentration of acid has to be equal to the concentration of base. An indicator has to be ...
Monday, April 20, 2015 by Kristin

Chemistry
Calculate the hydronium ion concentration of blood which has a pH of 7.24. 7.17 x 10-4 M 5.75 x 10-8 M 1.15 x 10-7 M 0.86 M none of the above I had chose 1.15*10^-7 by doing the log equation -log(1.15...) and I but it goether with -log(10*^-7.24) and it was closest to 14 and ...
Monday, April 20, 2015 by Kristin

Chemistry
What is the pH of a solution which has hydroxide concentration, [OH-], equal to 7.6 x 10-4 M? 0.88 3.12 10.9 13.1 none of the above I had chose 3.12 for this one and this one was also wrong. I did this because I did the equation -log(7.6*10^-4) and got 3.12.
Monday, April 20, 2015 by Kristin

Chemistry
How many moles of chlorine are there in 16.0 mL of 0.450 M CaCl2? 0.0072 mol 0.0144 mol 0.0216 mol 0.0375 mol none of the above I had chose 0.0072 and had submitted it in my assignment, but it had said it was wrong. I chose 0.0072 because I did this equation: 16/ 1000*0.450 ...
Monday, April 20, 2015 by Kristin

chemistry
How many grams of CuSO4 . 5H2O are needed to prepare 100ml of a 0.10M solution? Remember to change the given volume to liters and take the moles and convert them to grams via the molar mass to get grams of CuSO4 . 5H2O
Monday, April 20, 2015 by haley

Chemistry
Four sets of conjugate acid/base pairs and Ka of the acid are given. Which pair would be the best to form a buffer at pH = 9.2? You can use the Henderson-Hasselbalch equation to answer this question. HCNO/CNO- 3.5 x 10-4 HC2O4-/C2O4- 5.1 x 10-5 H2CO3/HCO3- 4.3 x 10-7 HCN/CN- 4...
Monday, April 20, 2015 by Kristin

chemistry
How many grams of oxygen gas must react to give 2.70g of ZnO? 2Zn(s)+O2(g)→2ZnO(s)
Monday, April 20, 2015 by danielle

Chemistry
How do you calculate the molality of a salt solution using only temperature? Is it even possible to do so? This was part of an ice cream lab and the temperature of the ice was 1.0 degrees celcius and the temperature of the ice water salt mixture was -0.4 degrees celcius but ...
Monday, April 20, 2015 by Jamie

chemistry
How many moles are their in 10.6 L os SO2 ?
Monday, April 20, 2015 by jerry

Chemistry
How does the freezing process of ice cream occur? What happens to ice when salt is added?
Sunday, April 19, 2015 by Jamie

Chemistry
Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...
Sunday, April 19, 2015 by Thomas

chemistry
Consider an electrochemical cell based on the reaction: 2H+(aq) + Sn(s) = Sn2+(aq) + H2(g). Which of the following actions would NOT change the measured cell potential? lowering the pH in the cathode compartment addition of more tin metal to the anode compartment any of the ...
Sunday, April 19, 2015 by danny

Chemistry
Copper has a specific heat of 0.387 J/g·°C. How much energy is required to raise the temperature of 215 g of copper from 47.0°C to 164.0°C?
Sunday, April 19, 2015 by Anonymous

Chemistry 1002
Over a period of time, the concentration of sulfuric acid in a lead storage battery of an automobile has decreased from 38 percent by mass(density=1.29 g/mL) to 26 percent by mass(1.19 g/mL). Assume the volume of the acid remains constant at 715 mL. a)Calculate the total ...
Sunday, April 19, 2015 by Jen

Chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
Sunday, April 19, 2015 by Ella

chemistry
When 6 liter of nitrogen gas reacts with 18 liters of hydrogen gas at constant temperature and pressure, how many liters of ammonia gas will be produced?
Sunday, April 19, 2015 by braeden

Chemistry
Consider this real reaction, and answer the questions based on it: TiO2 (s) + HCl (aq) ==> H2O (l) + TiCl4 (aq) 1) Based on this balanced equation, if the amounts used are 3 mol TiO2 and 5 mol HCl, Which one is the limiting reactant? 2) How many moles of each reactant are ...
Sunday, April 19, 2015 by Janelle

Chemistry
Two atoms with charges of +1 and -1 are separated by a distance of 0.5 angstroms. What would happen to the lattice energy between ions if the distance increases to 2 angstroms? A. The lattice energy decreases by a factor of 4. B. The lattice energy increases by a factor of 16...
Sunday, April 19, 2015 by Cortney

Chemistry
Why is Potassium and Bromide KBr? Why does Br not follow 2n2? Br = 35 electrons, 2,8,18,7 why does the shell not fill to 32 and is happy with one of Potassium electrons. Thank you kindly.
Sunday, April 19, 2015 by Steph

Chemistry
4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...
Saturday, April 18, 2015 by Thomas

Chemistry
Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and maybe d
Saturday, April 18, 2015 by Alexis

Physics/Chemistry HELP!! URGENT!!
Arsenic in geomedia contaminates an aquifer by naturally occurring geological processes. The aquifer has a bulk density of 1.55 g/cm3 and a particle density of 2.63 g/cm3. The distribution coefficient, Kd value is 0.0370 L/kg. The initial concentration at the source is 40.0 &#...
Saturday, April 18, 2015 by Maty

science-chemistry
if 1g of carbon dioxide is bubbled into 100g of a calcium hydroxide solution in a flask. what is the total mass of substance in the flask after the reaction is complete?
Saturday, April 18, 2015 by jasmine

chemistry
25 ml of 3M hno3 are mixed with 75ml of 4.0M HNO3 if volumes are additive then find molarity
Saturday, April 18, 2015 by Anonymous

Chemistry
Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a balanced chemical equation ...
Friday, April 17, 2015 by Melissa

Chemistry
Okay so in our class we did an ice cream lab where we use Ziploc bags to make ice cream. We made an ice cream mixture and then put it into a smaller Ziploc bag. Then we got a large Ziploc bag and placed ice in it and placed the bag with the ice cream mixture into the large bag...
Friday, April 17, 2015 by Jessica

chemistry
If 0.605 g of magnesium hydroxide reacts with 0.900g of sulfuric acid, what is the mass of magnesium sulfate produced? Mg(OH)2(s)+H2SO4(l)→MgSO4(s)+H2O(l​)
Friday, April 17, 2015 by Anonymous

Chemistry
If 0.605 g of magnesium hydroxide reacts with 1.00g of sulfuric acid, what is the mass of magnesium sulfate produced? Mg(OH)2(s)+H2SO4(l)→MgSO4(s)+H2O(l​) .605g Mg x 1molMgSO/1molMg=.605g MgSo 1.00g MgSO/1mol H2SO4=1.00g MgSO .605g+1.00g=1.605g This is incorrect, ...
Friday, April 17, 2015 by Jessica

chemistry
Sulfur dioxide and oxygen gases react at high temperature (400 o C) in the presence of a catalyst(like Pt) to form sulfur trioxide gas. The reaction is started from a gas mixture at 400oC with the partial pressures PSO2 = 15 atm and PO2= 10. atm. What will be the final partial...
Friday, April 17, 2015 by David

chemistry
i'm stumped on how to write this in mathematical form. it says the rate increased by a factor of 2000, I am supposed to determine by what percent the Energy of activation will be reduced. The answer is 25% in the book. I dont know how they get the answer using this formula...
Friday, April 17, 2015 by jojo

chemistry
Hydrogen gas (7.0 mL) is mixed with chlorine gas(4.0 mL) at a certain pressure and temperature. A reaction between H2and Cl2 is initiated by UV light. If pressure and temperature are kept constant, which gases and in which volumes will be found after the reaction is completed?
Friday, April 17, 2015 by David

Chemistry
Is PbI2 soluble in water or not? Following the solubility rules for ionic compounds, salts containing Pb are insoluble and iodide salts are soluble, so can it be both?
Friday, April 17, 2015 by Ally

Chemistry
What is the energy and frequency of a photon with a wavelength of 2.57 ×102 m?
Friday, April 17, 2015 by nona

Chemistry
What is the energy in joules and wavelength in meters of microwave radiation with  = 2.4 ×1011s-1?
Friday, April 17, 2015 by nona

chemistry
What would be the molarity of solution obtained by mixing equal volumes of 30% by mass H2SO4 (d=1.218 g/mL) and 70% by mass H2SO4 (d=1.610 g/mL). If the resulting solution has density 1.425 g/mL, calculate its molarity
Friday, April 17, 2015 by jaimi

chemistry
A piece of Al weighing 2.7g is titrated with 75 mL of H2SO4 (sp.gr. 1.18 g/mL and 24.7% H2SO4 by mass). After the metal is completely dissolved the solution is dilute to 400mL. Calculate molarity of free H2SO4 in solution.
Friday, April 17, 2015 by jaimi

chemistry
What is the normality and nature of a mixture obtained by mixing 0.62 g of Na2CO3 •H2O to 100mL of 0.1N H2SO4?
Friday, April 17, 2015 by jaimi

Chemistry
Calculate the number of grams of nitrogen gas, N2, in a container that has a volume of 7.50 L at a pressure of 1200 mm Hg and a temperature of 38.2 degrees Celsius. (R=0.0821 L*atm/mole*K)
Thursday, April 16, 2015 by James

Chemistry
If you mix 20.0mL of a 3.0M solution with 30mL of a 5.00M solution, determine the concentration in molarity of the new solution.
Thursday, April 16, 2015 by Chris

To Jaimi--chemistry
I responded to your post(the one on ratio of +/- charges) that's way down the list (I think on page 2 or 3 by now). Here is a link. http://www.jiskha.com/display.cgi?id=142​9203638
Thursday, April 16, 2015 by DrBob222

AP Chemistry
How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.1 liters against a constant external pressure of 0.0100 atm? Answer in units of J. I get w=-p(deltaV) but what about moles?
Thursday, April 16, 2015 by Alex

chemistry
When 2.85 g of HC7H5O2 (molar mass = 122.12 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter changed from 24.05 ºC to 29.19 ºC. What is the heat capacity of the calorimeter in units of kJ/ºC?
Thursday, April 16, 2015 by Anonymous

chemistry
how can you separate pure benzoic acid from a mixture of benzoic acid and sand?
Thursday, April 16, 2015 by amy

chemistry
When the equation for combustion for ethane is balanced using integer coefficients, the ΔH for the reaction = -2834 kJ. How many grams of ethane must be burned in order to heat 277.3 grams of water from 54.0°C to the boiling point and then boil all of it into the gas ...
Thursday, April 16, 2015 by Riese

Chemistry
A galvanic cell is composed of these two half-cells, with the standard reduction potentials shown: Cu2+(aq) + 2 e- ---->Cu(s) +0.34volt Cd2+(aq) + 2 e- ---->Cd(s) -0.40volt What is the standard free energy change for the cell reaction of this galvanic cell?
Thursday, April 16, 2015 by Zayn

Chemistry
What will be the potential of a cell constructed of a standard hydrogen electrode as one half-cell and a silver wire coated with AgBr dipping into 0.13 M HBr as the other half-cell? The value of Ksp for AgBr is 5.4 × 10-13. For the Ag/AgBr electrode, AgBr(s) + e- --->...
Thursday, April 16, 2015 by Jane

chemistry
Did I round to the correct number of Sig figs? 18.0/83 x 100= 22% 15.87/149.87x 100= 11.3%
Thursday, April 16, 2015 by Tim

chemistry
What is the oxidation state of the vanadium atom in VO4−
Thursday, April 16, 2015 by danny

chemistry
Consider an electrochemical cell based on the reaction: 2H+(aq) + Sn(s) = Sn2+(aq) + H2(g). Which of the following actions would NOT change the measured cell potential? lowering the pH in the cathode compartment addition of more tin metal to the anode compartment any of the ...
Thursday, April 16, 2015 by danny

Chemistry
If E Cu+2 had been chosen as the standard reference electrode and had been assigned a potential of 0.00 V, what would the reduction potential of the hydrogen electrode be relative to it?
Thursday, April 16, 2015 by Pete

Chemistry
How much energy in joules is required to heat 25g of ice from -10.0 C to 0.0C and change it to water. The specific heat is 2.09J Please explain
Thursday, April 16, 2015 by Vivian

Chemistry
In the copper-silver cell, why must the Cu2+ and Ag+ solutions be kept in separate in containers?
Thursday, April 16, 2015 by Maire

chemistry
Which element is reduced in the unbalanced reaction below? I− + MnO4− + H+ = I2 + MnO2 + H2O I no reduction occurred in this reaction O H Mn
Thursday, April 16, 2015 by danny

chemistry
In a titration, 4.1 g of an acid (HX) requires 32.8 mL of 0.74 M NaOH(aq) for complete reaction. What is the molar mass of the acid? Answer in units of g/mol.
Thursday, April 16, 2015 by Anonymous

Chemistry
CaCO3 ----------> CaO + CO2 When 45 grams of calcium carbonate decomposes, how many grams of calcium oxide are produced?
Thursday, April 16, 2015 by Andrea

chemistry
0.947 moles of NaC2H3O2 dissolved in 100 mL solution
Thursday, April 16, 2015 by chem

chemistry
How much BaCl2 would be needed to make 250 mL of a solution having same concentration of Cl^- as the one containing 3.78g of NaCl per 100 mL?
Thursday, April 16, 2015 by jaimi

chemistry
How many kg of wet NaOH containing 12% water are required to prepare 60 litre of 0.5N solution?
Thursday, April 16, 2015 by jaimi

chemistry
How much AgCl will be formed by adding 200mL of 5N HCl to a solution containing 1.7g AgNO3?
Thursday, April 16, 2015 by jaimi

Chemistry
What volume (in mL) of 0.55 M Na2SO4 solution is needed to precipitate all the barium, as BaSO4(s), from 15.5 mL of 0.25 M Ba(NO3)2 solution?
Thursday, April 16, 2015 by john

chemistry
in what ratio 0.2M NaCl and 0.1M CaCl2 solutions are to be mixed so that in the resulting solution, the concentration of negative ions is 50% greater than the concentration of positive ions?
Thursday, April 16, 2015 by jaimi

Chemistry
How much heat is required to boil 90.0g of water at its boiling point?
Thursday, April 16, 2015 by Chemistry Boiling point

statistics
The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868 9313 What is the probability that a randomly selected degree is not ...
Thursday, April 16, 2015 by Bob

Chemistry
How much heat is required to raise the temperature of 90.0g of water from its melting point to its boiling point? Can someone please help me set this up, I am so confused
Thursday, April 16, 2015 by Chemistry Heat

Chemistry
How much heat does your body lose when 3.15g of sweat evaporates from your skin at 25 ∘C? (Assume that the sweat is only water.) The heat of vaporization of water at 25 ∘C is 44.0 kJ/mole? Please someone help explain how to set up this problems or how to do it
Thursday, April 16, 2015 by Chemistry Heat

chemistry
25.0 ml of 15% NH4NO3 solution is diluted to 300.0 ml. What is the concentration of the diluted solution? .15% x 25=3.75ml Do I divide by 300ml and that's my answer?
Thursday, April 16, 2015 by Claire

chemistry
2 litre of NH3 at 30°C and at 0.20 atmosphere is neutralized by 134 mL of a solution of H2SO4. Calculate normality of H2SO4
Thursday, April 16, 2015 by jaimi

chemistry
Determine the hydroxide ion concentration in a solution that is 0.0004 M HCl. Answer in units of M. I have no idea how to start, I just need to know what I need to solve for and hoe to set it up, I know the formula pOH^-=-log[OH^-] I just don't know where to plug things in...
Thursday, April 16, 2015 by will

Chemistry
The amount of CaCO3 that is equivalent to all polyvalent metal ions in one liter of water. what is molarity of 100 ppm Mn^2+? What is the ppm of I^-1 in 0.000100 M of BaI2 ? Thank you!
Thursday, April 16, 2015 by Bear

chemistry
what mass of zinc dissolved in dilute HCL will produce 0.15g of hydrogen ? can you explain the steps to sloving this question please
Wednesday, April 15, 2015 by precious

chemistry
A compound has 85 % tin and 15% antimony. How many grams of antimony will be in 50. grams of the compound. My question is do I need to calculate the empirical formula first to do thi? I'm not sure where to start.
Wednesday, April 15, 2015 by Tina

Chemistry
A beam of light with a frequency of 7.61•1015 Hz hits the surface of the metal. What is the velocity of the electron ejected in m/s? (6 pts) How do you find the velocity based only off the frequency?
Wednesday, April 15, 2015 by Nora

chemistry
What is the volume of dry O2 gas at STP, if it had a volume of 5.00 L at 103 kPa and 300 K?
Wednesday, April 15, 2015 by Lee

Chemistry 11 grade -
Hydrogen gas was collected in a gas-collecting bottle with a volume of 30.0 mL by water displacement on a day where the temperature was 24ºC and the barometric pressure was 98.125 kPa. The vapour pressure of water at 24ºC is 2.99 kPa. What would be the volume of ...
Wednesday, April 15, 2015 by Tania

Chemistry
Predict the products of electrolysis in an aqueous solution of FeCl2. Please help. I don't understand how the answer is OH-, O2, H+, H2.
Wednesday, April 15, 2015 by Chase

chemistry
25.0 ml of 15% NH4NO3 solution is diluted to 300.0 ml. What is the concentration of the diluted solution? My Work: Total molar mass of NH4CO3 = 80.052 .15 x 80.052= 12.0078 25.0 ml (12.00 M) = 300.0 ml (c2) 300.19/300.0ml = The concentration is = 1.0M
Wednesday, April 15, 2015 by Anonymous

Chemistry
Suppose you are assigned to prepare a buffer of 0.10M HNO2 (Ka=1.7 x 10^-4) and 0.10M NaNO2 by mixing equal volumes of both solutions. What is the pH of the resultant solution? How would I first start this question? I have no clue what the steps are to be frank.
Wednesday, April 15, 2015 by Janice

Chemistry
A solution is prepared by mixing 37.5 mL of 0.20 M (CH3)3N with 50.0 mL of 0.20 M (CH3)3NHC and then diluting the mixture to a total volume of 100.0 mL. Calculate the pH of resulting solution. So far I have been able solve the mols of the two chemicals. (CH3)3N being 0.20M/....
Wednesday, April 15, 2015 by Mel

chemistry
How many moles of solute are in the following solutions? Part A 250mL of 0.26M acetic acid, CH3CO2H 2.90L of 0.31M NaOH 980mL of 3.5M nitric acid, HNO3
Wednesday, April 15, 2015 by denise

Chemistry
In an alternate universe, electron energies in an atom are found to obey the following equation where n is the principle quantum number: E = 3.0 x 10^(-19) J * nm * (1/n^2) ..where n is the principle quantum number A gas discharge lamp, like the lamps used in lab, contains ...
Wednesday, April 15, 2015 by Nora

Chemistry
A photoelectric experiment is performed by separately shining a laser of 450 nm (blue light) and 560 nm (yellow light) on a metal surface and measuring the number and kinetic energy of the ejected electrons. The threshold frequency of the metal is 6.00•10^14 Hz. a. ...
Wednesday, April 15, 2015 by Nora

chemistry
Calculate the weight in grams of potassium hydrogen phthalate (KHP, KHC2H3O2, MW 202.2 g/mole) required to neutralize 25.00 ml of 0.1 M NaOH solution.
Wednesday, April 15, 2015 by ryan

chemistry
Describe in detail how you would prepare 500 ml of 0.1 M HCl from 6 M HCl stock solution.
Wednesday, April 15, 2015 by ryan

chemistry
Describe in detail how you would prepare 1000 ml of 0.1 M NaOH from 6 M of NaOH stock solution.
Wednesday, April 15, 2015 by ryan

Chemistry
A photoelectric experiment is performed by separately shining a laser of 450 nm (blue light) and 560 nm (yellow light) on a metal surface and measuring the number and kinetic energy of the ejected electrons. The threshold frequency of the metal is 6.00•10^14 Hz. a. ...
Wednesday, April 15, 2015 by Nora

Chemistry
In an alternate universe, electron energies in an atom are found to obey the following equation where n is the principle quantum number: E = 3.0 x 10^(-19) J * nm * (1/n^2) ..where n is the principle quantum number A gas discharge lamp, like the lamps used in lab, contains ...
Wednesday, April 15, 2015 by Nora

math
Elin estimates her probability of passing French 0.6, passing chemistry is 0.8, (a)determine the probability that elin will pass French but fail chemistry (b) pass chemistry but fail French (c) pass both classes (d)fail both classes
Wednesday, April 15, 2015 by sakura

chemistry
How many electrons does the Au+ ion have ? Enter an integer below without any letters or symbols.
Wednesday, April 15, 2015 by danny

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