Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
1. When the energy released by the formation of solute-solvent attractions is greater than the energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving process ____. 2. Mixtures are classified according to their ____. 3. A homogeneous mixture...
Monday, May 21, 2012 at 4:34pm

Chemistry
Which is a possible electrochemical cell, shown in correct notation? A. Cd(s) | Cd2+(aq) || Cu2+(aq) | Cu(s) B. Mg(aq) | Mg2+(aq) || Pb2+(aq) | Pb(aq) C. Ag(s) | Ag2+(aq) || Pb3+(aq), Pb2+(aq) | Pt(s) D. Ag2+(s) | Ag2+(aq) || Pt(s) | Pb3+(aq), Pb2+(aq) E. Fe(s) | Fe3+(aq) || ...
Monday, May 21, 2012 at 12:53pm

chemistry
Hello. Please, help me do this. I would be really thankful! Find the mass of triacetate, which you can get from 1.62 ton of wood waste. The yield of process is 75% and there are 50% of cellulose in wood.
Monday, May 21, 2012 at 9:02am

SUPER URGENT-- CHEMISTRY
1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how much carbon dioxide if at stp? 3. ...
Monday, May 21, 2012 at 3:16am

Chemistry
URGENT!!!!! 4 questions total! 1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how ...
Monday, May 21, 2012 at 3:12am

chemistry
the density of 2 molal aqueous solution of NaOH is 1.10g/L. Calculate the molarity of the solution.
Monday, May 21, 2012 at 2:23am

Honors Chemistry
How many moles are in 4.36 L of oxygen gas at STP?
Monday, May 21, 2012 at 12:40am

Chemistry
How many mls of .1M KOH would it take to neutralize 75 mls of .07M CH3COOH?
Sunday, May 20, 2012 at 11:18pm

Chemistry
More finals review please... Ag^+ + 2e^- --> Ag E^nought = 0.800V Sn^4+ + 2e^- --> SN^2+ E^nought + 0.154V balanced equation: 2Ag^+ + Sn^4+ --> 2Ag + Sn^2+ E^nought cell = cathode - anode I thought I heard say that I had to flip the "less negative" half ...
Sunday, May 20, 2012 at 10:17pm

Chemistry
Arrange the ions: Cu^2+, Ni^2+, Mg^2+, & Zn^2+ in order of decreasing ability to be reduced... & in order of decreasing ability to be oxidized
Sunday, May 20, 2012 at 10:13pm

Chemistry
Which one of the following cobalt complexes should be the most stable? a. [Co(NH3)6]2+ b. [CO(NH3)6]3+ c. [Co(en)3]3+ d. [CoF6]3– I think the answer is c, but not really sure. Can Dr.Bob explain ? Thanks
Sunday, May 20, 2012 at 9:27pm

Chemistry
Concentrated hydrochloric acid has a concentration of 12.1 moles per liter. how many milliliters of the concentrated acid should be used to create 3.25L of a 0.100M solution?
Sunday, May 20, 2012 at 8:29pm

Chemistry
I'm a bit iffy on oxidation numbers... can someone please tell me if this is correct? Assign oxidation states to each element on both sides of the equation : KClO2--->KCl+O2 Reactants K = +1 Cl = +1 O = -2 Products K = +1 Cl = -1 O = 0 the element being reduced is Cl ...
Sunday, May 20, 2012 at 7:27pm

Chemistry
There is a current being applied to an aqueous solution fo sodium bromide. What is produced at the cathode and anode? I said that Na(s) being produced at the cathode and Br2(l) being produced at the anode. The other options are H2 and O2 for either but those wouldn't make ...
Sunday, May 20, 2012 at 7:17pm

chemistry
What is the BCA table for Potassium iodide and chlorine
Sunday, May 20, 2012 at 6:14pm

chemistry
The reactant concentration in a second-order reaction was 0.790 after 200 and 8.80×10−2 after 740 . What is the rate constant for this reaction?
Sunday, May 20, 2012 at 6:10pm

chemistry
Pvap (mm-Hg) of 100g 24%NaOH in H2O @100C? When Pvap pure H2O @100C is 760mm-Hg Pls where to start solving this problem? What is the equation? What are the staeps to get to the right answer?
Sunday, May 20, 2012 at 6:00pm

Chemistry
Amino acid solution was made by taking 3.58 g of the dry amino acid and making it up to 1.00L in water. A 25.0 mL sample was taken and titrated with NaOH of concentration of 0.0493M, with the first equivalence point at 18.15 mL and the second equivalence point at 32.05 mL. ...
Sunday, May 20, 2012 at 4:06pm

Chemistry
The solubility of AlCl(3) is 46.6 grams in 100 mL in water. How many grams of AlCl(3) will dissolve in 1.68 L?
Sunday, May 20, 2012 at 3:46pm

Chemistry help please?
order these highest PH to the lowest PH Ca(OH)2(aq) HCN(aq) NH3(aq) LIOH(aq) HCI(aq)
Sunday, May 20, 2012 at 3:45pm

Chemistry
The solubility of AlCl(3) is 46.6 grams in 100 mL in water. How many grams of AlCl(3) will dissolve in 1.68 L?
Sunday, May 20, 2012 at 2:59pm

Chemistry
calculate [H] and [OH] for a .01M calcium hydroxide solution?
Sunday, May 20, 2012 at 2:51pm

Chemistry
What volume of solution do you have if you know you dissolved 0.0500g nitric acid to make solution that was determined to be 0.0793M (molarity). My teacher gave 10.0 mL as the answer, but I got .0098. Not quite sure where I went wrong.
Sunday, May 20, 2012 at 1:46pm

Chemistry
Ammonia reacts with oxygen at 120 C to form NO and H20 in a sealed 40-L container. When 34 g of ammonia reacts with 96 g of oxygen, what is the partial pressure of the NO? What is the total pressure?
Sunday, May 20, 2012 at 11:31am

AP CHEMISTRY
What does a negative value for a standard potential indicate? PLEASE HELP!!
Sunday, May 20, 2012 at 11:29am

chemistry
Mass is lost or gains in a.) all chemical reactions b.) all nuclear fission reactions c.) all nuclear fusion reactions d.) all chemical and nuclear reactions my guess is B
Sunday, May 20, 2012 at 1:29am

Chemistry
Enthalpy changes: H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the value on delta H for the reaction: H2(g) + H2O2(l)----> 2H2O(l)
Saturday, May 19, 2012 at 10:05pm

Chemistry
Now if your lab partner determined that there were 5.001 x 1022 atoms of K in an unknown sample of KMnO4, how many milligrams would the unknown sample weigh?
Saturday, May 19, 2012 at 7:49pm

Chemistry
How many moles of K atoms are there in 152.8247 grams of KMnO4?
Saturday, May 19, 2012 at 7:47pm

Chemistry
Reviewing for final (this should be basic but...I am stuck): Describe how you would prepare 500.0 grams of a solution of sucrose, C12H22O11, in water which the mole fraction of sucrose is 0.125. I feel like somehow this is a molality question too :( Thank you for any input.
Saturday, May 19, 2012 at 12:47pm

chemistry
What is the mass of naoh needed to prepare a 0.365m solution dissolved in 1525ml of water
Saturday, May 19, 2012 at 11:02am

chemistry
What is the value of delta G at melting point of ice?
Saturday, May 19, 2012 at 9:55am

Chemistry
Calculate the degree of freedom of NH4Cl, initially in an evacuated chamber, with NH3 & HCl present from decomposition.
Saturday, May 19, 2012 at 6:17am

chemistry
how many times a proton is heavier than an electron
Saturday, May 19, 2012 at 4:05am

chemistry
the mass number of an element is 18 it contains 7 electrons what is the number of protons and neutrons in it what is atomic number of an element.
Saturday, May 19, 2012 at 3:54am

chemistry
KMnO4 + H2SO4 + KNO2---> MnO2 + KNO3 + K2SO4 + H2O
Friday, May 18, 2012 at 11:05pm

gen chemistry
calculate the percent m/v concentration of a 5L solution containing 500g NaCl
Friday, May 18, 2012 at 11:01pm

gen chemistry
final volume obtained when a 1.5M KOH solution is dilued to 1.25M
Friday, May 18, 2012 at 11:00pm

chemistry
determine the amount in grams of H2SO4 required to make 3.0L of 1.15M Nacl
Friday, May 18, 2012 at 10:55pm

chemistry
A 150-mL sample of a .600-mol/L calcium nitrate solution is mixed with a 1.00L of .500-mol/L NaOH(aq). Calculate the mass of precipitate produced in this reacton.
Friday, May 18, 2012 at 8:02pm

CHEMISTRY
Consider the following cell: Pt|H2(g, 0.130 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 0.90 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion concentration in the anode ...
Friday, May 18, 2012 at 5:45pm

Chemistry
The pH of a solution is 1. Which of the following statements are also true for the solution? (Select all that apply.) It will change the color of red litmus to blue. The concentration of hydronium ion is equal to the concentration of hydroxide ion. The solution is acidic. It ...
Friday, May 18, 2012 at 12:24pm

Chemistry
How many moles of methanol are dissolved in 1.5 L of water to make a 2.0 m solution?
Friday, May 18, 2012 at 12:01pm

Chemistry
in a blast furnace, iron(III) oxide is used to produce iron by the following (unbalanced) reaction: Fe2O3 + CO = Fe + CO2 a. if 4 kg Fe2O3 are available to react, how many moles of CO are needed?
Friday, May 18, 2012 at 11:55am

Chemistry
If a gas has a volume of 500 ml and pressure of 1.5 atm, what will the pressure be if the volume is reduced to 250 ml?
Friday, May 18, 2012 at 11:47am

chemistry
what is reason for the different atomic masses of the isotopes of an element
Friday, May 18, 2012 at 6:45am

chemistry
the particles protons and neutrons present in atomic nucleus are known as......
Friday, May 18, 2012 at 6:38am

chemistry
calculate grams of potassium bromide dissolved in 50 grams of water at 0 celcius
Friday, May 18, 2012 at 12:45am

Chemistry
4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A + B --> 3C I 2.8x10-5 M 2.5x10-4 0 C -2x -x +3x E 2.8x10-5-2x 2.5x10-4-x 3x10-5 B = 2.5x10-4-x = 2.4x10-4 x = 1x10-5 A = 2.8x10-5-2(1x10-5) = 8x10-6 C = ...
Thursday, May 17, 2012 at 11:25pm

Chemistry
A2B3 --> 2A + 3B I 0.001 0 0 C –x 2x 3x E 0.001-x 2x 3x 3x = 0.006, x = 0.002 A = 0.004 B = 0.006 A2B3 = 0.001-0.002 = (0.004)2(0.006)3/ Am I close?
Thursday, May 17, 2012 at 11:07pm

Chemistry
PLEASE fully explain these...I've already tried to figure them out and failed terribly... thanks so much 4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: At equilibrium, there is 4.8 x 10-5 mol of B. ...
Thursday, May 17, 2012 at 10:31pm

Chemistry
Calculate the grams of solute required to make 2500mL of 90% saline solution?
Thursday, May 17, 2012 at 6:03pm

honors chemistry
Compare the present Periodic Table with Mendeleevs original Periodic Table in terms of how it is organized, number of elements, what it looks like, ease of understanding, and information given.
Thursday, May 17, 2012 at 5:10pm

honors chemistry
why were the noble gases considered to be inert gases until the 1960s?
Thursday, May 17, 2012 at 3:11pm

chemistry
Na + H2O ¨ NaOH + H2 How many moles of H2 would be formed from 30 grams of Na in the following (UNBALANCED) equation?
Thursday, May 17, 2012 at 2:38pm

chemistry
a candle was 27.9 grams. the mass of the candle that burned in 3 minutes was 7.2 grams. a) How many moles of wax were in the candle before it burned ? b) How many molecules are in the candle before it burned? c) How many moles of wax were used up during the burning? d) How ...
Thursday, May 17, 2012 at 2:30pm

chemistry
4 moles CO, 5 moles N2 and 2 moles C2H4 are placed in a 5 liter vessel at 27 degree celsius . the ratio of kinetic energy per molecule of CO2, He and NH3 is
Thursday, May 17, 2012 at 2:06pm

chemistry
1) What 2 resources are used up as a candle burns? 2) What has happened to the atoms in these resources? 3) Is it possible to recover these 2 resources after theyve been used?
Thursday, May 17, 2012 at 12:56pm

Chemistry
The pH of a 0.010 M aqueous solution of a weak monoprotic acid, HX, is 4.5. What is the value of the acid ionization constant?
Thursday, May 17, 2012 at 12:16pm

Chemistry
How many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7gFe? Fe2O3(s) + 3CO(g) => 3CO2(g) + 2Fe(s)
Thursday, May 17, 2012 at 11:58am

chemistry
x gm og Ag was dissolved in HNO3 and the solution was treated with excess of NaCl when 2.87 g of AgCl was precipitated. find the value of x?
Thursday, May 17, 2012 at 8:28am

Chemistry
How do I calculate the mass of sodium carbonate required to neutralize 15-20 mL of 0.25M HCl at the stoichiometric point?
Thursday, May 17, 2012 at 1:52am

Chemistry
How does Mg obey the octet rule? How does N obey the octet rule?
Wednesday, May 16, 2012 at 9:26pm

integrated chemistry and physics
If 2 blocks have the same mass which one has the greater acceleration?
Wednesday, May 16, 2012 at 9:23pm

Chemistry
Hello, I had a lab about calorimetry and one of the questions was if the reaction of acetone with hypochlorite is an oxidation/reduction or acid/base. Would the answer be: oxidation/reduction because the oxygen from the hydroxide from the Sodium hydroxide detaches and joins ...
Wednesday, May 16, 2012 at 8:45pm

Chemistry
How many mL of a stock solution of 2M potassium nitrate would you need to prepare 100mL of .150 M potassium nitrate?
Wednesday, May 16, 2012 at 8:08pm

chemistry
A bond between two sugar molecules is formed by which of the following types of reactions? oxidation-reduction condensation single-replacement double-replacement
Wednesday, May 16, 2012 at 7:52pm

Chemistry
A solution of formic acid 0.20 M has a pH of 5.0. What is its Ka value? a) 5.0 x 10-10 b) 1.0 x 10-5 c) 5.0 x 10-5 d) 25
Wednesday, May 16, 2012 at 4:48pm

chemistry
if 240ml of O2 gas increases pressure from 0.40 atm to 0.80 atm what is the new volume? show all work
Wednesday, May 16, 2012 at 4:40pm

Chemistry
Mols benzoic acid = 12.2g/122.12g = 0.0999 Int. Concentration of Benzoic acid = 0.0999 mol/ 0.500L = 0.1998 M Ka = 6.3 x 10-5 = (x)(x)/0.1998 – x X = [H+] = * M pH = -log(*) = * Sorry, this question is just really confusing me..
Wednesday, May 16, 2012 at 3:35pm

Chemistry
Pb(NO3)2(aq) 2 x 10-3 M and Na2SO4(aq) 2 x 10-3 M Identify the ions that are present in each solution, and calculate their concentrations. If 1 L of each solution are mixed, will a precipitate be formed? Why?
Wednesday, May 16, 2012 at 3:31pm

Chemistry
Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) Identify the ions that are present in each solution, and calculate their concentrations.
Wednesday, May 16, 2012 at 3:17pm

Chemistry
Calculate the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution. Ka = 6.3 x 10^-5
Wednesday, May 16, 2012 at 2:53pm

Chemistry
If a reaction yields 2.5165 × 10^8 kJ, then how much mass was lost? (User 3.00 x 108 m/s as the speed of light) 2.30 × 10^-3 kg 5.60 × 10^-3 kg 2.80 × 10^-12 kg 5.60 × 10^-12 kg Please help.
Wednesday, May 16, 2012 at 2:21pm

Chemistry
A)How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O? b)A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with water to make 1....
Wednesday, May 16, 2012 at 1:04pm

Chemistry
What minimum amount of 1.55 M \rm HCl is necessary to produce 26.5 L of \rm H_2 at STP?
Wednesday, May 16, 2012 at 12:12pm

chemistry
balancing redox reactions occured in the basic solution : Cl2 + SO2(g) --> Cl^- (aq) + SO4^-2(aq)
Wednesday, May 16, 2012 at 8:43am

chemistry
using the metals aluminum and silver,give a diagram of a galvanic cell in a nitrate solution. include the anode and cathode half reaction, the cell voltage, the electron/ion flow.
Wednesday, May 16, 2012 at 8:29am

chemistry
balancing half reactions: ClO2^-1 --> Cl^-1
Wednesday, May 16, 2012 at 8:15am

CHEMISTRY
Here is what my lab was about: Properties of alcohols: First, I wrapped the bulb of a thermometer with a tissue secured with a wire. Then I squeeze enough methanol onto the tissue to completely saturate. At the same time, another person starts the stopwatch, reads the ...
Wednesday, May 16, 2012 at 7:20am

chemistry
0.540 g of bromine combine with 0.858 g of iodine to yield a compound X.Its % composition is
Wednesday, May 16, 2012 at 5:23am

chemistry
suppose 16.0g of benzene C6H6 is burned in oxygen.What mass of O2 is required for the complete combustion
Wednesday, May 16, 2012 at 4:16am

chemistry
suppose 16.0g of benzene C6H6 is burned in oxygen.What mass of O2 is required for the complete combustin
Wednesday, May 16, 2012 at 4:13am

Chemistry
if the yieeld for the following reaction is 85% how many grams of Al2S3 should be used to produce 165 g of Al(OH)3? Al2S3+6H2O-->2Al(OH)3+3H2S
Wednesday, May 16, 2012 at 2:00am

Chemistry
a mixture of 4.00 moles of hydrogen and 3.00 moles of oxygen is ignited, forming water. what is the maximum amount of water in grams that can be formed?
Wednesday, May 16, 2012 at 1:56am

chemistry
How do I balance a redox reaction for NaI + H2SO4 = H2S + I2 + Na2SO4 + H2O? I don't understand how to balance the electron loss for Iodine.
Wednesday, May 16, 2012 at 12:17am

Chemistry
Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
Tuesday, May 15, 2012 at 10:55pm

Chemistry
Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
Tuesday, May 15, 2012 at 10:47pm

chemistry
How much AgNO3 is needed to prepare a 0.282 m solution in 425 mL of water? Answer in units of g
Tuesday, May 15, 2012 at 10:14pm

chemistry
A reaction has ÄH = -378 kJ and ÄS = -37 J/K. Calculate ÄG at 25°C to confirm that the reaction is spontaneous. in kJ
Tuesday, May 15, 2012 at 9:48pm

chemistry
Thank you Dr.Bob for your speedy reply-I also tutor in other subjects, but chem. is my nemesis.
Tuesday, May 15, 2012 at 9:20pm

Chemistry
Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
Tuesday, May 15, 2012 at 8:51pm

chemistry
Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3·x H2O, where x is the number of moles of H2O per mole of...
Tuesday, May 15, 2012 at 8:46pm

Chemistry
Given the following thermochemical data: 1) C(s) + O2(g) -> CO2(g) ∆H = -393.5 kJ 2) H2(g) + 1/2 O2(g) -> H2O(l) ∆H = -285.8 kJ 3) 3 C(s) + 3 H2(g) -> C3H6(g) ∆H = +20.4 kJ 4) C3H6 (cyclopropane)(g) -> C3H6(propene)(g) ∆H = -33.0 kJ What is ...
Tuesday, May 15, 2012 at 8:38pm

Chemistry
In the future, you are employed as an organic chemist in a petrochemical company. You decide to quickly prepare the ester ethyl-3-cyclohexylpropanoate from 3-phenyl-1-propane and ethene. Describe the process you would use.
Tuesday, May 15, 2012 at 8:32pm

chemistry
How many moles of ammonium ions are in 5.393 g of ammonium carbonate?
Tuesday, May 15, 2012 at 8:24pm

Chemistry
It's a molar heat reaction lab. 0.07g Mg Mg+2HCl->MgCl2+H2 What is the actual value for the heat of reaction based on the enthalpy's of formation? HfHCl= -118.53 kJ/mole HfMgCl2= -774 kJ/mole
Tuesday, May 15, 2012 at 8:22pm

Chemistry
What was the initial temperature of a sample pf silver that released 1207 joules when 150.0 grams of this metal were transferred to a cooler temperature of 60 degress Celsius?
Tuesday, May 15, 2012 at 7:16pm

chemistry
Given the following thermochemical data: 1) H2(g) + 1/2 O2(g) -> H2O(g) ∆H = -241kJ 2) C6H10(g) + 17/2 O2(g) -> 6CO2(g) + 5H2O(g) ∆H = -3800kJ 3)C6H12(g) + 9O2(g) -> 6CO2(g) + 6H2O(g) ∆H = -3920 kJ What is ∆H for the following reaction? C6H10(g...
Tuesday, May 15, 2012 at 6:54pm

Chemistry
The element Niobium (Z=41) is a transitional metal. It has two valences 3+ and 5+. Using an orbital filling diagram, predict the order in which electrons will leave their orbitals in order to achieve those valences (i.e. the first ___ electron will come out of the ___ orbital).
Tuesday, May 15, 2012 at 6:49pm

chemistry
What is the molarity of a solution in which 58 g of NaCl are dissolved in 1.0 L of solution?
Tuesday, May 15, 2012 at 6:47pm

chemistry
In the future, you are employed as an organic chemist in a petrochemical company. You decide to quickly prepare the ester ethyl-3-cyclohexylpropanoate from 3-phenyl-1-propane and ethene. Describe the process you would use.
Tuesday, May 15, 2012 at 6:45pm

Chemistry
Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
Tuesday, May 15, 2012 at 6:05pm

Chemistry
An etheral solution contains benzoic acid, 9-fluorenone, abd ethyl 4-aminobenzoate. Why would benzoic acid and 9-fluorenone not be extracted from this etheral solution by aqueous HCl ?
Tuesday, May 15, 2012 at 5:10pm

chemistry
How many joules to vaporize 1.5 L of H2O at 19 degrees Celsius?
Tuesday, May 15, 2012 at 4:35pm

Chemistry
Can a solution of CrCl3 be stored in an aluminum container?
Tuesday, May 15, 2012 at 2:45pm

Chemistry
Using the following spontaneous reactions, classify the 3 metals involved (Cr, Sn, Al) according to increasing reductant properties. a) 2Cr + 3Sn2+ 2Cr3+ + 3Sn b) Al + Cr3+ Al3+ + Cr
Tuesday, May 15, 2012 at 2:37pm

Chemistry
Which pair of ions will be most likely to react at standard state conditions? 1. a) MnO4- and Sn2+ 2. b) Zn2+ and Cl- 3. c) I- and Cu 4. d) Fe3+ and Cu2+
Tuesday, May 15, 2012 at 2:04pm

Chemistry
If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values
Tuesday, May 15, 2012 at 2:04pm

Chemistry
Pb(NO3)2(aq) 2 x 10-3 M Na2SO4(aq) 2 x 10-3 M Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) a) What are the concentrations of each ion within this solution? b) If 1L of each solution is mixed; will a precipitate form? why?
Tuesday, May 15, 2012 at 1:04pm

Chemistry
Which of the following pairs of compounds will give a precipitate in a diluted solution?** a) Cu(NO3)2 and Na2CO3 b) KNO3 and NaCl c) MgCl2 and Ba(NO3)2 d) NH4Cl and Al2(SO4)3 A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be? a) AgOH b...
Tuesday, May 15, 2012 at 12:50pm

Chemistry
Acetic acid dissociates/ionizes itself as follows: CH3COOH(aq) ⇔ H+(aq) + CH3COO-(aq) If you add sodium acetate, CH3COONa, to the solution: a) a precipitate will be formed b) more acetic acid will be ionized c) the concentration of hydrogen ions will decrease d) the ...
Tuesday, May 15, 2012 at 12:49pm

Chemistry
A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be?** a) MgPb b) Pb(NO3)2 c) PbCrO4 d) MgCO3
Tuesday, May 15, 2012 at 12:48pm

Chemistry
Consider the reaction 3X + Y ⇔ 2W + Z. At equilibrium, [X] is 7.0 M, [Y] is 6.0 M, [W] is 5.0 M and [Z] is 7.0 M at 298 K. The value of the equilibrium constant at this temperature is: a) 0.085 b) 0.560 c) 1.800 d) 11.760
Tuesday, May 15, 2012 at 12:48pm

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
Tuesday, May 15, 2012 at 12:48pm

Chemistry
In the system A(g) + 2B(g) ⇔ 2C(g) + 2D(g) ΔH=21 kJ/mol, it is possible to increase the quantity of C by: a) adding a catalyst b) decreasing the [B] c) increasing the pressure d) increasing the temperature
Tuesday, May 15, 2012 at 12:47pm

Chemistry
1. As I understand it--As an acid is added to neutral water the (OH-) will...decrease?? Is this right? 2. If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 L of distilled water, what would be the concentration of the OH-?...I think this would be a pOH...
Tuesday, May 15, 2012 at 12:31pm

Chemistry
As I understand it--As an acid is added to neutral water the (OH-) will...decrease?? Is this right?
Tuesday, May 15, 2012 at 1:25am

Chemistry
Please Help!! Using heat of fusion, Specific heat, or heat of evaporation. Calories to condense 135g of steam at 100 degrees C and to cool the liquid to 15 degrees C. This is how I calculated it using heat of evaporation: 135gx540 cal=72900cal 72900cal/135g x (delta T)85 ...
Tuesday, May 15, 2012 at 12:16am

Chemistry
Iron(III) oxide is formed when iron combines with oxygen in the air. What is the mole ration of Fe used and the mole of Iron(iii) oxide produced? 4Fe(s) + 3O2(g) > 2Fe2O3(s) a - 3:2 b - 4:3 c - 4:2 d - 3:4 Can someone help?
Monday, May 14, 2012 at 9:47pm

chemistry
3CaCO3+2FePO4-->Ca3(PO4)2+Fe2(CO3)3 We start with 100g. of calcium carbonate and 45g. iron (III) phosphate. What is the maximum amount of Ca3(PO4)2 and Fe2(CO3)3 ??
Monday, May 14, 2012 at 9:28pm

chemistry
Can someone pleeeeeaaase explain Charle's law in a simple way.
Monday, May 14, 2012 at 8:46pm

chemistry
If you used the alcohol burner to heat the water and all of the heat from the burning of the alcohol went into heating the water, how many grams of alcohol will you burn to do that heating? (Remember, for every 7,000 calories needed, it will use up a gram of alcohol.)
Monday, May 14, 2012 at 8:10pm

chemistry
After the lithium chloride dissolves and you get the heat from the Heat of Solution, what could you do to the dissolved lithium chloride so that you could reuse it for heating?
Monday, May 14, 2012 at 8:10pm

chemistry
4 FeO(s) + O2(g) ¨ 2 Fe2O3(s) calculate value of delta H i have done this 4(-272.0)+0->2(-825.5) and the products minus reactants and i got -563 but it is not right?!
Monday, May 14, 2012 at 6:17pm

chemistry
on my selected thermodynamic data i cant find delta H for SiCl4(L) (i can solve the reaction i just cant figure out what SiCl4(L) is.
Monday, May 14, 2012 at 4:59pm

chemistry
2. Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ. Write a correct thermochemical equation for this reaction, explain how you ...
Monday, May 14, 2012 at 4:00pm

chemistry
Use Hess's law and the following equations to calculate ÄH for the reaction N2(g) + 2O2(g) N2O4(g). 2NO2(g)->N2O4(g) ÄH = –57.0 kJ/mol N2(g)+O2(g)->2NO(g) ÄH = 180.6 kJ/mol 2NO2(g)->2NO(g)+O2(gÄH = 114.4 kJ/mol
Monday, May 14, 2012 at 2:15pm

chemistry
1. Find the pH of a solution whose [H3O+] is 9.5 X 10^ -8 M. 2. What is the [H3O+] concentration of a solution with a pH of 5.45? 3. What is the pOH of a solution with a [OH -] concentration of 2.97 X 10^ -10 M?
Monday, May 14, 2012 at 12:41pm

chemistry
what mass of KCl can be dissolved in 200.0g of water at 15.0C?
Monday, May 14, 2012 at 10:00am

Chemistry
how many atoms of oxygen are present in 30 g of glucose
Monday, May 14, 2012 at 4:57am

Chemistry
30 cubic-centimetre hydrocarbon requires 90 cubic-centimetre of oxygen for complete combustion and 60 cubic-centimetre of carbondioxide is formed .What is the formula of hydrocarbon?
Monday, May 14, 2012 at 4:03am

chemistry
2Na+(aq) + CO32-(aq) + H2O(l) 2Na+(aq) + HCO3-(aq) + ???(aq)
Monday, May 14, 2012 at 1:29am

chemistry
Write the double-replacement reaction of PbCl2 reacting with Na2CO3.
Monday, May 14, 2012 at 1:28am

chemistry
How many calories will be needed to melt that 50 grams of snow (report as 1 significant figure)?
Monday, May 14, 2012 at 1:27am

chemistry
Write the double-replacement reaction of HgCl2 reacting with Na2CO3.
Monday, May 14, 2012 at 12:24am

Chemistry
Hi Dr.Bob, Which is the correct formula for dinitrobis(ethylenediamine)cobalt(III) nitrate? I'm not sure which is the correct one out of these two: a)[Co(en)2(NO2)2]NO3 or b)[Co(NO2)2(en)2]3(NO3)3 ? At the instance, I've choosen option a). Is my naming correct?
Sunday, May 13, 2012 at 11:53pm

Chemistry
For the following acids: i. CH3COOH ii. HNO2 iii. HCN a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. c)Identify the acid-base pairs.
Sunday, May 13, 2012 at 10:52pm

Chemistry
A weak acid solution, HX 0.37 M, has a pH of 3.70. Calculate the acidity constant for this acid.
Sunday, May 13, 2012 at 10:32pm

Chemistry
Calculate the volume of Ba(OH)2 0.20 M necessary to neutralize 300.0 mL of H3PO4 0.30 M. (4 marks)
Sunday, May 13, 2012 at 10:27pm

chemistry
What is the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution?
Sunday, May 13, 2012 at 10:23pm

Chemistry
25g of ethanol is dissolved in 1.50 kg of whater. what will the boiling point of the solution be?
Sunday, May 13, 2012 at 10:21pm

Chemistry
the chemical dichlorobenzne will not disolve in water, what muct the polarity of dichlorobenznebe by and why?
Sunday, May 13, 2012 at 10:20pm

Chemistry
Commercial vinegar usually has a concentration of 5%, per volume. a) Calculate the [H3O+] , if the density of acetic acid is 1.051 g/mL. b) Calculate the pH.
Sunday, May 13, 2012 at 9:59pm

Chemistry
Calculate the KA of formic acid if 2.3 g of it is dissolved in 1 litre of water to give [H+] of 0.003 M.
Sunday, May 13, 2012 at 9:34pm

Chemistry
The equilibrium constant for the following reaction is 7.2 x 10-10. What is the [H+] in a solution 1.0 M of this acid? HCN + H2O --> H3O+ + CN-
Sunday, May 13, 2012 at 9:33pm

Chemistry
200 g of CH3COOH are dissolved in enough water to make 1.5 L. What is the molarity of the acetic acid solution?
Sunday, May 13, 2012 at 9:33pm

Chemistry
Which of the following contains the highest H3O+ ion concentration? Explain your answer. HCl 0.1 M HCH3CO2 0.1 M
Sunday, May 13, 2012 at 9:32pm

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