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May 28, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
If 125cal of heat is applied to a 60.0-g piece of copper at 20.0(Deg C), what will the final temperature be? The specific heat of copper is 0.0920cal/(g.degC)
Saturday, February 16, 2013 at 2:26pm

Chemistry
A compound of Tin Sulfate is decomposed in the lab to give 1.91g of Tin, 1.03 grams of Sulfur, and 2.06g Oxygen. Determine if this is a compound of Tin(II) Sulfate or Tin(IV) Sulfate.
Saturday, February 16, 2013 at 1:12pm

chemistry
Please help me with this dilution. Given a very concentrated tube of virus. Apply serial dilution to make 1:7500 dilution. Dilute virus in PBS
Saturday, February 16, 2013 at 10:26am

chemistry
In terms of kinetic theory explain why tyre should not be over inflated
Saturday, February 16, 2013 at 5:11am

chemistry
A compound with the percent composition shown below has a molar mass of 60.10g/mol. Find its molecular formula: C, 39.97% H, 13.41% N, 46.62%
Friday, February 15, 2013 at 9:11pm

Chemistry
What is the final temperature after a 11.9 g piece of ice is placed into a Styrofoam cup containing 110 g of hot water at 73.3 degrees Celsius?
Friday, February 15, 2013 at 8:38pm

chemistry
do not understand this problem The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (in g/L) of CaSO4(s) in 0.500 M Na2SO4(aq) at 25 °C.
Friday, February 15, 2013 at 7:23pm

Chemistry
I need to find the boiling point, but I am confused on this question 0.250M glucose in water (assume the density of water is 1.00 g/ml)
Friday, February 15, 2013 at 6:44pm

Chemistry
Arrange the following aqueous solutions in order of increasing boiling point, explain your answer: 0.120 m glucose (C6H12O6), 0.05 m LiBr, 0.05 m Zn(NO3)2. Using data the boiling point constants given in the test book, calculate the boiling points of each of the above aqueous ...
Friday, February 15, 2013 at 5:42pm

Chemistry
What is the % mass of 12 M hydrochloric acid. Density of 12 M hydrochloric acid solution is 1.18 g/mL and the density of water is 1.00 g/mL
Friday, February 15, 2013 at 5:42pm

Chemistry
How many grams of sulfuric acid is in 25.0 g of 8.00 % H2SO4 solution?
Friday, February 15, 2013 at 5:41pm

Chemistry
How many moles of Sulfur are in 1 mole of Al2(SO4)3 and If the densitry of a noble gas is 1.783 g/L at STP, that gas is.... My guess: Argon? Then theres a question that says "Which as the greater mole.... and it lists things like: 1 mole Of Ar 1 Mole of O How would you ...
Friday, February 15, 2013 at 2:36pm

Chemistry
Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of thiosulfate ion (S2O3 2-) and the increase in the ...
Friday, February 15, 2013 at 12:52pm

Chemistry
Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion (S2O3 2-) and the increase in the ...
Friday, February 15, 2013 at 12:47pm

chemistry
To 160.0 mL of a buffer solution containing 0.250 M ammonia and 0.100 M ammonium chloride, 20.00 mL of 1.00M HClO4 are added. a) Calculate the pH of the new solution. b) What becomes the pH if another 20.00 mL of the same acid solution is added?
Friday, February 15, 2013 at 10:49am

Chemistry
A solution contains 314 mg/L of Ca2 . What is the solution in nmol/m3?
Friday, February 15, 2013 at 12:40am

Chemistry
What are the units for rate constant? I know each may have different units for the k value, I just don't know how to get them. How can I tell just by looking at a given rate law?
Friday, February 15, 2013 at 12:34am

chemistry
!. Which of the following structures would you expect to have a net dipole moment? HC(triple bond)CH NH4+ H2C(double bond)O BCl3 2. Rank the sp, sp2, and sp3 orbitals in order of decreasing (highest to lowest) energy. a)sp> sp2>sp3 b)sp3>sp2>sp c)sp2>sp>sp3 d...
Friday, February 15, 2013 at 12:10am

chemistry Emergency TEST
1.How many moles of sodium oxide are produced when3.9 moles of sodium combine with excess oxygen. 2. Sodium chloride decomposes into elemental sodium and elemental chlorine.How many grams of chlorine will be produced if 39.4 grams of sodium chloride decomposes 3.If 6.7 moles ...
Thursday, February 14, 2013 at 10:50pm

Chemistry
You weigh out 1.20 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass of carbon dioxide that will be produced.
Thursday, February 14, 2013 at 10:32pm

chemistry
A 3.24-L flask is filled with propane gas (C3H8), at 1.00 atm and -13.5°C. What is the mass of the propane in the flask?
Thursday, February 14, 2013 at 9:48pm

analytical chemistry
Write balanced net-ionic equations to describe: a. The oxidation of Mn2+ to MnO4- by ammonium peroxydisulfate [(NH4)2S2O8] b. The air-oxidation of HAsO32- to HAsO42- c. The oxidation of Ce3+ to Ce4+ by sodium bismuthate (NaBiO3) Write balanced net-ionic equations to describe: ...
Thursday, February 14, 2013 at 8:27pm

Chemistry
find the heat energy needed to change 200 g of water at 4c to water at 88c
Thursday, February 14, 2013 at 4:06pm

chemistry
find the heat energy needed to change 150g of ice at -15c to ice at -63c
Thursday, February 14, 2013 at 4:03pm

Chemistry
A solvent has a molar mass of 37.2 g/mol and a normal boiling point of 111.2 oC. The boiling point elevation constant, K b , for this solvent is 1.58 oC/m. If 18.7 g of a nonelectrolyte having a molar mass of 20.5 g/mol are mixed with 170.0 g of the solvent, what is the ...
Thursday, February 14, 2013 at 3:35pm

chemistry
A saturated solution of NaCl (dissolved in water) has a concentration of 4.01 M at a given temperature. The solution has a volume of 1 L (1000 mL). If the water were to evaporate until the volume of the solution is 500 mL (and then stirred), what would the concentration of ...
Thursday, February 14, 2013 at 3:34pm

Chemistry
How much acid is needed to neutralize a 5L solution with a pH of 12.5. The acid available is 1 N HCL.
Thursday, February 14, 2013 at 1:56pm

chemistry
A 230 g sample of a compound contains 136.6 g of carbon, 26.4 g of hydrogen, and 31.8 g of nitrogen. The rest is oxygen. What is the mass percent of oxygen in the compound?
Thursday, February 14, 2013 at 11:01am

chemistry
h2s + HNO3 -->s+ no+H2O balance by oxidation number change
Thursday, February 14, 2013 at 10:21am

chemistry
How many moles of water will produced at equilibrium be if there is 1.0 mole of carbon dioxide formed at equilibrium?
Thursday, February 14, 2013 at 8:50am

chemistry
why cant Na be used to prepare H2?
Thursday, February 14, 2013 at 7:45am

chemistry
The concentration of a certain ionic compound in aqueous solution is 0.186mol/L . It is only solute in the solution. The concentration of pottassium ions in the same solution ia 0.558mol/L. Explain why the concentrations of the ions in the solution are different. What might ...
Thursday, February 14, 2013 at 6:19am

Chemistry
1) Aldrin and dieldrin are pesticides that used to be allowed for the control of soil insects. In ontario, the maximum allowable total concentration of alrin plus dieldrin in drinking water is 0.7 ppb. If a 250mL sample of drinking water is found to contain 0.0001mg of aldrin ...
Thursday, February 14, 2013 at 6:06am

CHEMISTRY
Ni(NO3)2.H2O+2KSCN WHAT IS THE PRODUCT?? WHAT COMPLEX IS FORMED ?
Thursday, February 14, 2013 at 5:22am

Fundamentals of Chemistry
balance the equation by ion electron method. Fe^++ + MnO4- = Fe3+ +Mn2+ (acidic medium) please help me..!!
Thursday, February 14, 2013 at 3:43am

chemistry
Exactly 50.0ml solution of Na2CO3 was titrated with 65.8ml of 3.00M HCl. If the specific gravity of the Na2CO3 solution is 1.25, what percent by weight of Na2CO3 does it contain?
Thursday, February 14, 2013 at 3:19am

Chemistry
Need help on a lab results write-up. The lab is the synthesis and analysis of a transition metal complex. General reaction was stated as: Fe(III) + x(acac) -> Fe(acac)x - we were to determine x by completing experiment. x = 1, 2, 3, 4... acac = 2, 4 pentanedione Procedure ...
Thursday, February 14, 2013 at 12:14am

Chemistry
Given the following equilibrium constants are given at 377°C, 1/2 N2(g) + 1/2 O2(g) NO(g) K1 = 110−17 1/2 N2(g) + O2(g) NO2(g) K2 = 110−11 N2(g) + 3/2 O2(g) N2O3(g) K3 = 210−33 N2(g) + 2 O2(g) N2O4(g) K4 = 410−17 determine the values for the ...
Wednesday, February 13, 2013 at 11:49pm

Chemistry
At a particular temperature, 13.7 mol of SO3 is placed into a 3.9-L rigid container, and the SO3 dissociates by the reaction given below. 2 SO3(g) 2 SO2(g) + O2(g) At equilibrium, 3.8 mol of SO2 is present. Calculate K for this reaction.
Wednesday, February 13, 2013 at 11:08pm

Chemistry
I am doing a lab on enthaply of vaporization of water, I got everything else on the post lab but these two questions, please help. The deltaHvap data from the handbook reference vary with temp. 1) if your data were perfect, but deltaHvap is not constant, how would this show up...
Wednesday, February 13, 2013 at 10:10pm

Chemistry
How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)
Wednesday, February 13, 2013 at 9:07pm

Chemistry
How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)
Wednesday, February 13, 2013 at 9:07pm

chemistry
A crucible containing potassium chlorate has a mass is 24.426 g. The crucible is heated according to the lab procedure for this week's experiment and is found to weigh 23.202 g. Write an equation for the reaction and, assuming that all the chlorate decomposed, calculate ...
Wednesday, February 13, 2013 at 8:45pm

chemistry
You weigh out 1.70 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass of carbon dioxide that will be produced.
Wednesday, February 13, 2013 at 7:53pm

Chemistry
A sample of gaseous PCl5 was introduced into an evacuated flask so that the pressure of pure PCl5 would be 0.54 atm at 425 K. However, PCl5 decomposes to gaseous PCl3 and Cl2, and the actual pressure in the flask was found to be 0.85 atm. Calculate Kp for the decomposition ...
Wednesday, February 13, 2013 at 7:09pm

chemistry
2.0 x 10^-5 grams of hydrogen gas at 155 degree calsius exert a pressure of 322.5 torr on the walls of a small cylindrical tube. What is the volume of the tube?
Wednesday, February 13, 2013 at 6:48pm

chemistry
To what temperature, in degree celsius, must 10.0 grams of ammonia gas (NH3) have to be heated in a 15.0 L container in order for it to exert a pressure of 3.50 atm?
Wednesday, February 13, 2013 at 6:46pm

Chemistry
Burning an empty Styrofoam container results in volumes of black sooty flames. On the basis of this observation alone, to what class of hydrocarbons would you suspect a component of the polystyrene polymer found in Styrofoam belongs? Explain.
Wednesday, February 13, 2013 at 6:41pm

chemistry
Calculate the molecular weight of a gas if 4.5L of the gas at 785 torrs and 23.5 degrees celcius weigh 13.5g.
Wednesday, February 13, 2013 at 6:28pm

Chemistry
I did a lab today in class and part of the lab is to experimentally find the enthalpy for the dissolution of ammonium chloride by dissolving 4.0 g of NH4Cl(s) in 50.0 mL of H2O(l). I got a -5°C temperature change and calculated delta H to be 15 kJ/mol. According to the ...
Wednesday, February 13, 2013 at 5:41pm

chemistry
NH4HS(s) <-> NH3(g) + H2S(g) An equilibrium mixture of this reaction at a certain temperature was found to have (NH3)=.268 and (H2S)=.360 What is the value of the equilibrium constant at this temperature?
Wednesday, February 13, 2013 at 5:29pm

CHEMISTRY
Help Please!!!! H2SO4(aq) = 2H+(aq) + SO42-(aq) What is the hydrogen ion concentration, in mol dm−3, when 1.50 g of sulfuric acid is dissolved in water to give 0.500 dm3 of solution
Wednesday, February 13, 2013 at 5:19pm

college chemistry 101
why does an opened bottle of carbonated water keep its frizz longer if kept in a refrigerator than if left at room temperature?
Wednesday, February 13, 2013 at 4:03pm

Chemistry
The solubility of nitrogen in water is 6.9 x 10^-4 at exactly 1 atm pressure. What is the solubility of nitrogen under .80 atmp pressure? I don't know where to start with this problem, what formula do I use?
Wednesday, February 13, 2013 at 3:38pm

Chemistry
The freezing point of ethanol is -114.6 C and its Kf value is 2.00 C/m. What is the freezing point for the solution prepared by dissolving 50.0 g of glycerin (C3H8O3) in 200.0 g ethanol? I used Change in temp=Kfm kf=2.00 I calculated m to be 2.1736. I ended up the answer of -...
Wednesday, February 13, 2013 at 3:34pm

chemistry
what are the fundamental particles in antifreeze
Wednesday, February 13, 2013 at 3:14pm

chemistry
what determines the color of light when an electron moves from one level to another
Wednesday, February 13, 2013 at 3:07pm

chemistry
What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
Wednesday, February 13, 2013 at 2:40pm

chemistry
NH4HS(s) <-> NH3(g) + H2S(g) An equilibrium mixture of this reaction at a certain temperature was found to have (NH3)=.268 and (H2S)=.360 What is the value of the equilibrium constant at this temperature?
Wednesday, February 13, 2013 at 2:15pm

Chemistry
How many milliliters of water has been dispensed if the initial buret reading was 0.38 ml and the final is 24.70 ml
Wednesday, February 13, 2013 at 1:24pm

chemistry
why we cant use hcl to react with Fe to create fecl3?
Wednesday, February 13, 2013 at 1:06pm

Chemistry
What is the osmotic pressure of .100 M solution of aluminum chloride at 27 deg C? I used the formula: pi=(i)(M)(R)(T) wasn't sure what i was but for M put down 0.100M, R=0.08206 and T=300K Answer is 9.85, but not sure how to get that.
Wednesday, February 13, 2013 at 11:59am

Chemistry
The freezing point of ethanol is -114.6 deg Celsius and its Kf value is 2.00degC/m. What is the freezing point for a solution prepared by dissolving 50.0g of glycerin in 200g ethanol? I thought it may have been using the formula deltaT=Kf*m, but I'm not sure.
Wednesday, February 13, 2013 at 11:51am

Chemistry
How many moles of Al(OH) are required to completely react with 2.75mol of H2SO4?
Wednesday, February 13, 2013 at 10:46am

chemistry
determine ox number of each atom below A. CF4 B. KO2 C. SnO D. H2SO4 E. Fe2S3 F. AuCl3
Wednesday, February 13, 2013 at 10:05am

chemistry
Balance using oxidation Number Methode A. MnO4- + C2H4 + H20 --> MnO2 + OH- + C2H6 B. ClO- --> Cl- + ClO3-
Wednesday, February 13, 2013 at 10:03am

chemistry
Balance using oxidation Number Methode A. MnO4- + C2H4 + H20 --> MnO2 + OH- + C2H6 B. ClO- --> Cl- +
Wednesday, February 13, 2013 at 10:01am

chemistry
balance these redox reactants & determine oxidator agent and reducing agent A. Zn + NO3- --> Zn+2 +NH4 + Acid B. Cr(OH)3 + H2O2 --> CrO4 -2 + H20 (Basic)
Wednesday, February 13, 2013 at 9:58am

chemistry
In raction NH3 + 5 O2 --> 4 NO + 6 H20 . I 1 mol NH3 and 1 mol O2. what is the limiting reactant? ow Much NO will form?
Wednesday, February 13, 2013 at 9:54am

chemistry
a sample of iron are is known as Fe3O4. A 50 gram of sample contain 26 gram of Fe. Determine % yield Fe3O4 In sample
Wednesday, February 13, 2013 at 9:51am

chemistry
in reaction = Mg + O2 --> MgO if 24 gram of Mg is burned in excess oxygen to form 40 gram of MgO, How much O2 is used?
Wednesday, February 13, 2013 at 9:49am

chemistry
in reaction S + O2 -> SO2, determine percent yield if 4 grams of S produced 64 gram of SO2
Wednesday, February 13, 2013 at 9:47am

chemistry
in reaction S + O2 -> SO2, determine percent yield if 4 grams of S produced 64 gram of SO2
Wednesday, February 13, 2013 at 9:43am

chemistry
anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?
Wednesday, February 13, 2013 at 8:30am

Chemistry
Chromatography relies on the differences in polarity between the compound, the mobile phase and the stationary phase. In your own words explain how polar and non-polar compounds can be separated using cellulose paper and petroleum ether. I have no idea
Wednesday, February 13, 2013 at 7:15am

chemistry
Sulfuric acid is a strong acid and dissociates in water as shown in Reaction 4. Equation label: (4) Help Please!!!! H2SO4(aq) = 2H+(aq) + SO42-(aq) What is the hydrogen ion concentration, in mol dm−3, when 1.50 g of sulfuric acid is dissolved in water to give 0.500 dm3 ...
Wednesday, February 13, 2013 at 7:04am

chemistry
in an attempt to establish the formula of an oxide of nitrogen , a known volume of the pure gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was shown to have taken place. NxHy gives xNH3 + YH20...
Wednesday, February 13, 2013 at 5:09am

Chemistry
You are asked to prepare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and some added sodium benzoate salt (C6H5COONa). a) Find the pH of the benzoic acid solution BEFORE adding the salt. b) Use the Henderson-Hasselbalck equation to ...
Wednesday, February 13, 2013 at 12:47am

Chemistry
You are asked to prepare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and some added sodium benzoate salt (C6H5COONa). a) Find the pH of the benzoic acid solution BEFORE adding the salt. b) Use the Henderson-Hasselbalck equation to ...
Wednesday, February 13, 2013 at 12:40am

chemistry
Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+ and Fe 3+ in this solution?
Tuesday, February 12, 2013 at 11:02pm

chemistry
enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction 2P(s)red+3H2(g)---->2PH3(g) a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity of this reaction at any temp (S for PH3 is ...
Tuesday, February 12, 2013 at 10:06pm

chemistry
a gas sample heated in a cylinder uses 650kJ of heat. a piston that compresses this gas does 800kJ of work. What is the change in internal energy, ^E of the gas during this process?
Tuesday, February 12, 2013 at 9:52pm

chemistry
list the following substances in order of increasing molar entropy at 25'c. H2O(l), H2O(g), H2O(s), C(s), Ar (g) Explain your reasoning
Tuesday, February 12, 2013 at 9:44pm

chemistry
the standard free energies of formation of SO2(g) and SO3(g) are -300.4 and -370.4kJ mol-1 respectively. Calculate the value of the equilibrium constant at 25'C for the reaction 2SO2(g)+O2(g)==>2SO3(g)
Tuesday, February 12, 2013 at 9:37pm

Chemistry
Complete and Balance the following equation using the half-reaction method; (MnO4^-) + (CH3OH) --> (Mn^2+) + (HCO2H)
Tuesday, February 12, 2013 at 9:23pm

Chemistry
Complete and Balance the following equation using the half-reaction method; (MnO4^-) + (CH3OH) --> (Mn^2+) + (HCO2H)
Tuesday, February 12, 2013 at 9:20pm

chemistry
Which of the following os a true statement about the periodic table? A. periods form horizonal rows;groups form vertical columns B. groups form horizontal rows;periods form vertical columns C. catagories form horizontal rows;gases form vertical columns D. gases form horizontal...
Tuesday, February 12, 2013 at 8:54pm

chemistry
A granite sample has a density of 2.76 g/cm3. What is the mass of a granite block that measures 3.25 cm x 5.50 cm x 7.00 cm?
Tuesday, February 12, 2013 at 8:26pm

Chemistry
Consider titrating an unknown chloride sample with 0.10 +/- 0.01M AgNO3 and the following data: Initial Buret reading-0.19 +/- 0.02mL Final Buret reading- 9.26 +/- 0.03mL Unknown sample mass- 95.0 +/- 0.2mg Find the weight 5 of Cl- in the sample.
Tuesday, February 12, 2013 at 7:28pm

chemistry
In a household radiator, 1000 g of steam at 100 C condenses. How much heat is released?
Tuesday, February 12, 2013 at 6:52pm

chemistry
12.50g of an unknown compound (i=2) are dissolved in 50.00g of water and this solution freezes at –7.5 degrees C. What is the molar mass of this compound?
Tuesday, February 12, 2013 at 6:46pm

college chemistry
If i have a highly polar mobile phase, what will happen to the non-polar or less polar compounds during chromatography? will they move less up the TLC plate or actually even more because the mobile phase itself is so polar.
Tuesday, February 12, 2013 at 6:45pm

chemistry
The hydrogen gas collected also contains some water vapor. The pressure of this mixture of gases equals the room pressure. find the partial pressure of H2 gas.
Tuesday, February 12, 2013 at 6:40pm

Chemistry
How much heat is necessary to change a 52.0 g sample of water at 33.0 C into steam at 110.0 C?
Tuesday, February 12, 2013 at 6:12pm

Chemistry
How much heat is necessary to change a 52.0 g sample of water at 33.0 C into steam at 110.0 C?
Tuesday, February 12, 2013 at 6:11pm

Chemistry
Is the Conversion of NO2 to HNO3 endo- or exothemic? Calculate the enthalpy and free energy change for the reaction 4NO2 + o2 + 2H2O-----> 4HNO3 in the aqueous phase.
Tuesday, February 12, 2013 at 6:06pm

chemistry
Draw and name the different structural forms of L-fructose that would exist in aqueous solutions
Tuesday, February 12, 2013 at 5:36pm

Chemistry
Is the Conversion of NO2 to HNO3 endo- or exothemic? Calculate the enthalpy and free energy change for the reaction 4NO2 + o2 + 2H2O-----> 4HNO3 in the aqueous phase.
Tuesday, February 12, 2013 at 5:31pm

Chemistry
1.What mass of water could be absorbed from moist air by a 1000.0g sample of a zeolite with the empirical formula Na2Al2Si3O10*2H2O, assuming that the zeolite had been dehydrated first? 2. What mass of Ca2+ could be removed from hard water by a 2000.0g sample of the hydrated ...
Tuesday, February 12, 2013 at 5:23pm

Laboratory (math, chemistry)
Most analytic methods are subject to drift. Describe a system which could be used to determine the rate of drift of an analytic method.
Tuesday, February 12, 2013 at 5:08pm

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