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August 20, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?
Sunday, May 19, 2013 at 5:06pm

Chemistry
A bracelet containing .200 mol of metal atoms is 75% gold. How many particles of gold atoms are in the bracelet?
Sunday, May 19, 2013 at 4:58pm

Chemistry
What are the Oxidation and Reducation reactions for these equations : BaCl2 + NaHCO3 -> BaCO3 + NaCl + HCl (carbon is the reduction reaction, but I don't know what the oxidation reaction is) CaCO3 + HCl -> CaCl2 + CO2 + H2O
Sunday, May 19, 2013 at 4:43pm

Chemistry
Find the polar coordinate of the following. (0,-6) I know r = sq.root of 6 but tan theta = -6/0 doesn't exist so how will I find the degree? Thanks
Sunday, May 19, 2013 at 4:05pm

chemistry
Complete the mass balance expression for a saturated solution of Ag2CO3. Note at least one blank is a numeric coefficient. (Note: Ignore any subsequent reactions of Ag .)
Sunday, May 19, 2013 at 3:55pm

chemistry
hydrogen gas can be produced by reacting aluminum with sulfuric acid .How many L hydrogen gas are produced by reacting 15.0 mol of sulfuric acid with 15.0 mol of aluminum at STP?
Sunday, May 19, 2013 at 12:49pm

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 at 2:15am

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 at 2:14am

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 at 2:13am

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 at 2:13am

chemistry
Describe the preparation of 2litre of 0.05molar silver from the primary standard grade solid.
Sunday, May 19, 2013 at 2:11am

Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
Saturday, May 18, 2013 at 10:41pm

Chemistry
what is the total molar concentration of all the ions in .040 M solutions of the following salts in water? .040 M KCL .040 M CuSO4 .040 M CaCl2
Saturday, May 18, 2013 at 9:53pm

Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
Saturday, May 18, 2013 at 9:52pm

Chemistry
a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid
Saturday, May 18, 2013 at 9:50pm

Chemistry
A 12% solution is diluted 1:60. What is the volume and concentration of the final solution? I started off with this 12(1/60) = 0.2% However, how do I get the final volume and concentration? Thanks
Saturday, May 18, 2013 at 5:39pm

Chemistry
A solution of NaCl and glucose gives a freezing point of -0.95°C. It contains 140 mOsmol glucose/L. Give concentration of NaCl in milliosmoles per liter and molarity. Thanks
Saturday, May 18, 2013 at 3:02pm

chemistry
how many liters of oxygen are necessary for the combustion of 340 g of ethanol (c2h5OH) assuming the raction occurs at STP? no idea how to work this out
Saturday, May 18, 2013 at 2:28pm

Chemistry
the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction
Saturday, May 18, 2013 at 1:45pm

M.m.m.campus (chemistry)
Laboratory preparation of carbon dioxide?
Saturday, May 18, 2013 at 11:55am

Chemistry
how many outer shell electrons does a carbon atom have using periodic table?
Saturday, May 18, 2013 at 10:57am

Chemistry
In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.
Saturday, May 18, 2013 at 9:18am

chemistry
which orbitals have centre of symmetry
Saturday, May 18, 2013 at 8:18am

chemistry
what is the normality and nature of the mixture obtained by mixing 0.62 gram of na2co3.h2o to 100 ml of 0.1N h2so4
Saturday, May 18, 2013 at 4:13am

chemistry
will linear polybutadiene or branched polybutadiene have a higher molar volume?
Saturday, May 18, 2013 at 2:33am

Chemistry
How much 3M H2SO4 can be made from 20ml of 12N H2SO4?
Saturday, May 18, 2013 at 12:04am

chemistry
The equilibrium constant (Ka) for equation 3 at 25 °C is 1.80 × 10−4 mol dm−3. Calculate the equilibrium concentration of hydrogen ions if the concentration of formic acid at equilibrium is 0.00400 mol dm−3. (Show all of your working and give your ...
Friday, May 17, 2013 at 6:29pm

Chemistry
How many grams of CaCl2 are needed to make 100ml of a 15% solution in water if only the dihydrated (CaCl2 •2H20) salt is available?
Friday, May 17, 2013 at 4:32pm

World History
1. The purpose of American and European imperialism in the Pacific was mainly to gain. A. markets fro manufactured products B. coaling stations and naval bases C. sources of raw materials D. places for surplus population I said C. 2. The development of antiseptics during the ...
Friday, May 17, 2013 at 3:39pm

Easy chemistry
Whats the charge on a carbon cation?? I believe it is a positive charge, but does it have a number along with it?? not sure..
Friday, May 17, 2013 at 12:06pm

CHEMISTRY
commercial HCL IS SOLD AT 37% WITH SPECIFIC GRAVITY OF 1.18.HOW WILL YOU PREPARE 5OML FOR 100STUDENTS AT THE CONCENTRATION OF 0.25M
Friday, May 17, 2013 at 7:41am

CHEMISTRY
commercial HCL IS SOLD AT 37% WITH SPECIFIC GRAVITY OF 1.18.HOW WILL YOU PREPARE 5OML FOR 100STUDENTS AT THE CONCENTRATION OF 0.25M
Friday, May 17, 2013 at 7:40am

chemistry
if 10 metric tons of silver nitrate is produced, how much would i need to charge per metric ton of silver nitrate to break even
Friday, May 17, 2013 at 7:03am

Chemistry
0.80 mol/L of A and B are mixed. They react very slowly to produce C and D as follows: A(aq) + B(aq) ⇔ C(aq) + 2D(aq) When equilibrium is attained, the concentration of C is 0.60 mol/L and the concentration of A is: a) 0.20 M b) 0.40 M c) 0.60 M d) 0.80 M
Friday, May 17, 2013 at 12:47am

chemistry
If we have a concentration of H+ at 5 x 10-2 mol/L, what is the pH value?
Thursday, May 16, 2013 at 7:56pm

Chemistry
Equal moles of nitric acid (HNO3) and formic acid (HCOOH) were each dissolved in equal volumes of water. State and explain which of the resulting solutions would have the higher pH. Your answer should include an explanation of the terms strong acid and weak acid and a ...
Thursday, May 16, 2013 at 4:58pm

Chemistry
What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution?
Thursday, May 16, 2013 at 4:40pm

CHEMISTRY
A diatomic ideal gas is heated at constant volume until its pressure becomes 3 times.it is again heated at constant pressure until its volume is doubled.find the molar heat capacity for the whole process?
Thursday, May 16, 2013 at 3:50am

chemistry
Describe the preparation of 2litre of 0.05molar silver from the primary standard grade solid.
Thursday, May 16, 2013 at 3:05am

Chemistry
Calculate the pressure exerted by a 14.6 mol NH3g in a 3.2 L container at -15.0 celcius using the Van der Waals equation.
Wednesday, May 15, 2013 at 8:37pm

URGENT CHEMISTRY
Which of the following pairs of compounds will give a precipitate in a diluted solution? Question 4 options: A) Cu(NO3)2 and Na2CO3 B) KNO3 and NaCl C) MgCl2 and Ba(NO3)2 D) NH4Cl and Al2(SO4)3 ALL OF THEM ARE SOLUBLE? WHAT DO I DO?
Wednesday, May 15, 2013 at 7:37pm

Chemistry Help Please
The concentration of hydroxide ions in a solution of nitric acid 0.2 M is: a. 2 x 10-14 M b. 5 x 10-14 M c. 5 x 10-7 M d. 2 x 10-1 M IS IT D)?
Wednesday, May 15, 2013 at 6:47pm

chemistry
What are [H+] and [OH-] for 0.01 M perchloric acid
Wednesday, May 15, 2013 at 6:45pm

Chemistry
CaCO3(s) <-> CaO(s) + CO2(g) What would happen if CO2 was removed? Would the reaction shift left? Does that mean CaCO3 increases and CaO and CO2 decrease ?
Wednesday, May 15, 2013 at 5:18pm

Chemistry - Le Chateli.
3Fe(s) + 4H2O(g) <-> Fe3O4(s) + 4H2(g) What happens when Fe(s) is added? Would the reaction shift right?
Wednesday, May 15, 2013 at 5:15pm

chemistry
a balloon has a volume of 456 mL at a pressure of 1.0 atm. it is taken under water in a submarine to depth. where the air pressure in the submarine is 3.3 atm. what is the volume of the balloon? assume constant temperature?
Wednesday, May 15, 2013 at 2:05pm

chemistry
balanced equation for the reaction of HNO3 + STARCH +KI
Wednesday, May 15, 2013 at 1:35pm

physics/chemistry(Thermodynamics)!!!!!helppppp!
In a certain chemical process,a lab technician supplies 254 j of heat to a system. At the same time,73 j of work are done on the system by iys surroundings.What is the increase in the internal energy of the system?
Wednesday, May 15, 2013 at 9:57am

Chemistry
Is there a difference between SiO2(aq) and H4SiO4?
Wednesday, May 15, 2013 at 9:44am

chemistry
Islands in the middle of the oceans (for example, Great Britain, Hawaii, Bermuda) tend to have more stable climates with smaller temperature fluctuations than regions of the same mass surrounded by land (for example, continents). Use your knowledge of heat energy, specific ...
Wednesday, May 15, 2013 at 9:38am

chemistry
The surface tension versus log concentration for two surfactants are shown below. Describe in not more than 5 sentences how the two surfactants can be so different.
Wednesday, May 15, 2013 at 8:13am

Chemistry; -_-
Help? How would you do these? /: Draw electron dot diagrams for the following: Na Mg As F Ne
Wednesday, May 15, 2013 at 4:43am

PHYSICS/CHEMISTRY
Can someone explain to me, what does Metastable isotope means? I already read the definitions on the internet but I really don't understand it. Thanks in advance.
Tuesday, May 14, 2013 at 9:22pm

chemistry
balance the net ionic equation for the overall reaction. Pt | Fe2+(aq), Fe3+(aq) || I-(aq) | AgI(s) | Ag(s) a) Fe3+(aq) + Ag(s) + I-(aq) → Fe2+(aq) + AgI(s) b) Fe2+(aq) + Ag(s) + I-(aq) → Fe3+(aq) + AgI(s) c) Fe3+(aq) + AgI(s) → Fe2+(aq) + Ag(s) + I-(aq) d) ...
Tuesday, May 14, 2013 at 7:19pm

Chemistry
How to calculate Q in Nernst Equations, we used 0.10M solutions in all of our half cells. Nernst equation: Ecell = E0cell - RT/nF ln Q Overall reactions: Cu(s) + Pb2+(aq) ~ Cu2+(aq) + Pb(s) and 3Pb(s) + 2Al3+ ~ 3Pb2+ 2Al(s) Thank you!
Tuesday, May 14, 2013 at 5:54pm

Chemistry
How Many molecules Of sodium are contained in 2 L Of sodium dichromate? The density Of sodium dichromate is 3.7 g/ml
Tuesday, May 14, 2013 at 4:20pm

chemistry
5. Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless heater. The heat is produced by the following reaction: Mg(s) + 2H2O(l) --> Mg(OH)2(s) + H2(g) Calculate the number of grams of Mg needed for this reaction to release enough energy to increase...
Tuesday, May 14, 2013 at 3:49pm

chemistry
4. A 35.0 mL sample of 1.00 M KBr and a 60.0-mL sample of 0.600 M KBr are mixed. The solution is then heated to evaporate water until the total volume is 50.0 mL. What is the molarity of the KBr in the final solution?
Tuesday, May 14, 2013 at 3:48pm

chemistry
4. A 35.0 mL sample of 1.00 M KBr and a 60.0-mL sample of 0.600 M KBr are mixed. The solution is then heated to evaporate water until the total volume is 50.0 mL. What is the molarity of the KBr in the final solution?
Tuesday, May 14, 2013 at 3:48pm

chemistry
3. When a mixture of 10.0 grams of acetylene (C2H2) and 10.0 grams of oxygen (O2) is ignited, the resulting combustion reaction produces CO2 and H2O. A) Write a balanced equation for this reaction. B) What is the limiting reactant? C) How many grams of C2, H2, O2, CO2, and H2O...
Tuesday, May 14, 2013 at 3:47pm

Chemistry
Is Cl2 + 2e- -> 2Cl- an oxidation half-reaction?
Tuesday, May 14, 2013 at 3:33pm

Chemistry
Is Cl2 + 2e- -> 2Cl- an oxidation half-reaction?
Tuesday, May 14, 2013 at 3:28pm

chemistry
how much of 0.1 M NaOH is needed to neutralize 5mL of 0.1 M of HCL to a ph 7(color on the ph scale)...Thank you
Tuesday, May 14, 2013 at 1:07pm

Chemistry
0.1 mol of HCl is added to 1 L of water. What is [H+] and [OH-]?
Tuesday, May 14, 2013 at 12:37pm

chemistry
If 15 grams of table salt is used how many moles of sodium sulfate are produced
Tuesday, May 14, 2013 at 12:35pm

Chemistry
How many grams of barium nitrate is needed to form a solution with 5.00 mass% Ba (NO3)2 in 400 grams of water.
Tuesday, May 14, 2013 at 11:35am

chemistry
A 211 g sample of barium carbonate, BaCO3, reacts with a solution of nitric acid to give bar- ium nitrate, carbon dioxide and water. If the acid is present in excess, what mass and volume of dry carbon dioxide gas at STP will be produced
Tuesday, May 14, 2013 at 4:22am

Chemistry
Using your experimental data, calculate E0cell. Standard voltaic cells contain 1M solutions, but we used 0.10M solutions in all of our half cells. Use the Nernst equation to calculate the standard cell potential (E0cell) from your measured Ecell and Qrxn. Data: Nernst Equation...
Tuesday, May 14, 2013 at 2:24am

Science (chemistry) help please
The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know ...
Tuesday, May 14, 2013 at 1:47am

Chemistry
How many grams of gas are present in a sample that has a molar mass of 70 g/mol and occupies a 2 L container at 117 kPa and 35.1C?
Monday, May 13, 2013 at 11:16pm

Chemistry
I am dealing with the integrated rate laws. Can somebody please help me with my algebra? First order ln(A)=-kt+ln(B) solve for t,and k and B Second order 1/(A) = kt+1/(B) solve for k and t and B
Monday, May 13, 2013 at 10:53pm

chemistry
The reaction of chlorine gas with solid phosphorus (P4) produces solid phosphorus pentachloride. When 63.5 g chlorine reacts with 28.5 g P4, which reactant is limiting?
Monday, May 13, 2013 at 9:50pm

chemistry
If something originally contained 32.0 g of Po-210, which has a half-life of 10.5 minutes, and was now 73.5 minutes old, how many grams would be left?
Monday, May 13, 2013 at 8:57pm

chemistry
What volume of 31.5 grams of molecular element,chlorine gas, occupy at a pressure of 1.29 atm and temperature of 20 degrees cesius, assuming that the behavior of chlorine gas is ideal?
Monday, May 13, 2013 at 7:53pm

Chemistry
.012 mol of solid NaOH is added to a 1 L solution of HCl 0.01 M. What is the pH of the solution?
Monday, May 13, 2013 at 7:17pm

Chemistry
How much water, in grams, can be made from 6.82 × 1024 hydrogen molecules? Answer in units of g
Monday, May 13, 2013 at 6:08pm

Chemistry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 51.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M What volume of water ...
Monday, May 13, 2013 at 6:07pm

Chemistry
The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it only shows a graph with ...
Monday, May 13, 2013 at 6:07pm

Chemistry
What is the concentration of NO− 3 after mixing? Answer in units of mol/L
Monday, May 13, 2013 at 6:06pm

Chemistry
Three solutions 56.0 mL of 0.6 M KNO3; 77.0 mL of 0.6 M Ca(NO3)2; and 42.0 mL of 0.29 M KCl were poured together to make one new solution. What is the concentration of Cl− after mixing? Answer in units of mol/L
Monday, May 13, 2013 at 6:05pm

Chemistry
In the titration of 14.0 mL of 0.10M acetic acid with 0.40 M NaOH, (A) How many mL of NaOH needed to completely neutralize the acid? Given the balanced equation: CH3COOH (aq) + NaOH (aq) 􏰀 CH3COO Na (aq) + H2O
Monday, May 13, 2013 at 5:11pm

chemistry
3.Suppose the innermost orbit an electron can occupy has an energy level of -19 eV. Based on the absorption spectrum shown below, what is the energy of energy level 4?
Monday, May 13, 2013 at 3:35pm

chemistry
what volume of carbon dioxide is formed when 11 of CS2 reacts with 18 L O2 to produce carbon dioxide gas and sulfur dioxide gas at STP?
Monday, May 13, 2013 at 3:24pm

Chemistry
Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3 I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj H2 + 1/2O2 = H2O - Enthalpy is -285.8 kj Fe2O3 + 3H2O = 2Fe(OH)3 - Enthalpy is 288.6 I try using Hess Law but cannot solve it. Can anyone help me ...
Monday, May 13, 2013 at 2:37pm

Chemistry
How many moles of sulfuric acid are required to neutralize 0.80 mol of sodium hydroxide? H2SO4 + 2NaOH -> Na2SO4 + 2H2O I got 0.40 mol. Is this right?
Monday, May 13, 2013 at 2:35pm

chemistry
Physicain elects to re-hydrate the patient br intravenous(IV) administration of 2.0 L of 0.45% (w/v) of NaCl. 0.45%9w/v) = 0.45g/100ml A.How many grams of NaCl were given? B.How many moles of Nacl were given? C.What is the molarity of the NaCl solution?
Monday, May 13, 2013 at 2:26pm

chemistry
a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.
Monday, May 13, 2013 at 1:28pm

chemistry
a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.
Monday, May 13, 2013 at 11:53am

physics/chemistry(kinetic ..gasses)
How many degreed of freedom have the gas molecules,if under standard conditions the gas dendity is 1.3kg/m^3 and velocity of sound propagation on it is v=330m/s?
Monday, May 13, 2013 at 10:58am

chemistry
balance the equation and name the reaction taking place C3H5OH+O2 equals CO2+ H2O
Monday, May 13, 2013 at 10:44am

chemistry
What is the molarity of the acetic acid if 0.5ml of a vinegar solution has been titrated with the 0.101M solution of NaOH and the volume of the NaOH solution at the equivalence point is 5.0mL?
Monday, May 13, 2013 at 8:59am

Chemistry
If I used 100% larger sample mass of an unknown substance what effect would that have on the empirical formula that would be obtained?
Monday, May 13, 2013 at 2:20am

chemistry - thank you:)
What volume of H2SO4 0.04 M is required to completely neutralize 200 mL of Al(OH)3 0.02M?
Monday, May 13, 2013 at 1:51am

Chemistry
An 800-mg sample containing sulfate was treated with slight excess of barium chloride, yielding a precipitate that contained 4.3 mg of co precipitated CaCO3. after ignition and cooling, the precipitate weighed 277.0 mg. Calculate the a.) apparent % SO4 b.) true % SO4 and c.) ...
Sunday, May 12, 2013 at 11:19pm

Chemistry
If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?
Sunday, May 12, 2013 at 10:39pm

Chemistry
Two gases effuse through a hole. Gas A has 9 times the molecular mass of gas B. What is the ratio of the two molecular speeds?
Sunday, May 12, 2013 at 8:02pm

Chemistry
2.76 grams of silver carbonate produced a 50 percent yield of silver oxide. what is the actual mass of this reaction
Sunday, May 12, 2013 at 7:16pm

Chemistry
how many grams of phosphorus pentachloride are needed to produce 49 grams of phosphoric acid.
Sunday, May 12, 2013 at 7:15pm

chemistry
calculate the heat energy required to raise the temperature of a 500. gram iron pipe from 25 degress celcius to 100 degrees celcius. the specific heat for iron is .45 J/g degrees celcius
Sunday, May 12, 2013 at 4:41pm

chemistry
Calculate Ecell forthe following electrochemical cell at 25 C Pt(s) |H2(g, 1.00 bar) |H + (aq, 1.00 M) || Pb2+(aq, 0.150 M) | Pb(s)
Sunday, May 12, 2013 at 3:52pm

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