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January 29, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
A sample of oxygen at room temperature occupies a volume of 5.00x102 mL at 1.50 atm pressure. What pressure (in atm) must be applied to compress the gas to a volume of only 1.50x102 mL? Assume the temperature is constant.
Tuesday, November 18, 2014 at 11:06am

Chemistry
When 0.100 mol CaCO3(s) and 0.100 mol CaO(s) are placed in an evacuated sealed 10.0 L container and heated to 385 K, P(CO2) = 0.220 atm after equilibrium is established. CaCO3(s) <~> CaO(s) + CO2(g) 0.05 atm CO2(g) is then removed from the container. What is the total ...
Tuesday, November 18, 2014 at 9:56am

Chemistry
Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?
Tuesday, November 18, 2014 at 4:03am

Chemistry
1. What happens if our calorimeter is not properly insulated..what effect will it have on our calculated specific heat capacity I.e too large, too small or no effect....explain. 2. If our partner forgot to cover the coffee cup calorimeter while the temperature was being ...
Tuesday, November 18, 2014 at 1:57am

Verifying-Chemistry related-Dr.Bob222
Hey Dr.Bob222, Pearlite is not ceramic material correct? Just need a second opinion. Thanks!
Tuesday, November 18, 2014 at 1:51am

chemistry
A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is 24.9oC. Calculate the ...
Tuesday, November 18, 2014 at 1:24am

chemistry
What would the specific heat of graphite be? A 15.0g piece of graphite is heated to 100.0 degrees C and placed in calorimeter. The graphite releases 815.1 J of heat to reach a final temperature of 23.9 degrees C.
Tuesday, November 18, 2014 at 12:13am

chemistry
how are moles and molarity related to volume? is it molx molarity or mol/molarity to get volume?
Tuesday, November 18, 2014 at 12:03am

chemistry
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 655 mL of a 36.0% (w/v) sucrose solution?
Monday, November 17, 2014 at 11:22pm

chemistry
What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.150 L of 0.190 M NaI? Assume the reaction goes to completion.
Monday, November 17, 2014 at 10:52pm

Chemistry
At a given temperature, a first-order reaction has a rate constant of 3.5 ´ 10–3 s–1. How long will it take for the reaction to be 24% complete? A chemical reaction that is first-order in X is observed to have a rate constant of 2.20 ´ 10–2 s–1...
Monday, November 17, 2014 at 9:43pm

Chemistry- URGENT please HELP
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
Monday, November 17, 2014 at 9:12pm

chemistry
how many liters of gaseous hydrogen bromide at 97 degrees c and 0.953 atm will a chemist need if she wishes to prepare 3.50 L of 1.20 M hydrobromic acid?
Monday, November 17, 2014 at 8:02pm

Chemistry
In an aqueous solution the [OH–] is 2.0 x 10–6 M. What is the [H3O+]? Question 17 options: 1.0 x 10–7 M 2.0 x 10–6 M 1.0 x 10–8 M 5.0 x 10–9M
Monday, November 17, 2014 at 7:40pm

Chemistry
Consider the following hypothetical acid-base reaction. A(aq) + B(aq) C(aq) + D(aq) WA WB SA SB Question 13 options: The position of the equilibrium shifts from left to right The position of the equilibrium shifts from right to left The position of the equilibrium doesn’t...
Monday, November 17, 2014 at 7:18pm

Chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 20 g of water at 20 oC and 20 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
Monday, November 17, 2014 at 6:15pm

Chemistry Physics
How many Btu of heat are required to melt 33.0 lb of ice at 32°F and to raise the temperature of the melted ice to 72°F?
Monday, November 17, 2014 at 5:36pm

chemistry
What is avogadro's law
Monday, November 17, 2014 at 4:37pm

chemistry
2.) An ideal gas in a 6.30L container at 3.50 atm and at 273K is heated to 435.0K. What is the new pressure?
Monday, November 17, 2014 at 3:50pm

chemistry
3.) Co2(g) is collected over water at 20 degrees Celsius. The pressure in the bottle is equalized with the atmospheric pressure, which is measured to be 715.8mmHg. What is the pressure of the Co2(g)?
Monday, November 17, 2014 at 3:50pm

chemistry
1.) 105.4mL of Co2(g) was generated with a pressure of 765.5mm Hg for the gas. The temperature of the apparatus was 25.0C. How much zinc oxide would be left in tube if version A was the correct formula?
Monday, November 17, 2014 at 3:49pm

chemistry
1.) 1.25 moles of an ideal gas are contained in 8.0L. If the temperature is 33K, what is the volume at STP?
Monday, November 17, 2014 at 3:48pm

chemistry
One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium (III) hydroxide from a solution containing rhodium(III) sulfate according to the following balanced chemical equation: Rh2(SO4)3(aq)+6NaOH(aq)-->2Rh(OH)3(s)​+3Na2SO4(aq) What is the ...
Monday, November 17, 2014 at 3:45pm

chemistry
What volume of ammonia gas, measured at mmHg and 43.5 degrees C, is required to produce 8.41g of ammonium sulfate according to the following balanced chemical equation: 2NH3(g)+H2SO4(aq)->(NH4)2SO4(s)
Monday, November 17, 2014 at 3:41pm

chemistry
In a volumetric analysis experiment, a solution of sodium oxalate (Na2C2O4) n acidic solution is titrated with a solution of potassium permanganate (KMnO4) according to the following balanced chemical equation: 2KMnO4(aq)+8H2SO4(aq)+5Na2C2O4(aq)-> 2MnSO4(aq)+8H2O(l)+CO(g)=...
Monday, November 17, 2014 at 3:35pm

chemistry
A 5d electron emits a photon, what are the possible quantum n,l, quantum numbers of the final s tate electron? What would the quantum num bers be a fter a photon with the smallest allowed (non-zero) energy is emitted?
Monday, November 17, 2014 at 1:22pm

analytical chemistry
Adding 10.0 mL of 0.500 M HCl to 100.0 mL of pH = 7 water produces a solution with a pH of 1.34. What is the pH of the resulting solution when 10.0 mL of 0.500 M HCl is added to 100.0 mL of the buffer solution in the introductory example? That buffer contained 0.100 moles of ...
Monday, November 17, 2014 at 12:57pm

AP Chemistry
Which of the following statements is true regarding two points within a system? A. They will have different types of particles. B. They cannot interact with each other. C. They have different boundaries. D. They have the same internal energy. Im think the answer is d.
Monday, November 17, 2014 at 12:33pm

AP Chemistry
Two objects A and B of different size are both at a temperature of 500 K and are connected by a rod (A looks four times larger than b). What will be the nature of transmission of heat? I believe there won't be a transmission of heat. Any thoughts. Here are the options A. ...
Monday, November 17, 2014 at 12:27pm

Chemistry
Help needed with a calorimeter lab. I have to measure the enthalpy of a neutralization reaction between NaOH and HCl as well as find the concentration of NaOH the following ways. - using the mass and volume of NaOH - Using calorimetric data assuming no heat lost to calorimeter...
Monday, November 17, 2014 at 12:36am

Chemistry
if 5.00 ml of 1.66x10^-1 M HCl solution is diluted to exactly 250.0 ml with water, what is the concentration of the resulting solution?
Sunday, November 16, 2014 at 11:02pm

Chemistry Buffers
Write reactions showing how each of the following buffers would neutralize added HCl. HF and NaF Express your answer as a balanced chemical equation. Identify all of the phases in your answer. HC2H3O2 and KC2H3O2 Express your answer as a balanced chemical equation. Identify ...
Sunday, November 16, 2014 at 10:09pm

Chemistry
Please also, help me set up this problem. Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is C2H2(g)+2H2(g)⇌C2H6(g). Given the following data at standard conditions (all pressures equal to 1 atm and the common ...
Sunday, November 16, 2014 at 9:51pm

Chemistry
Help me set up this problem. I have been looking at a few examples of similar problems and I keep getting the wrong answers. I'm getting really confused. Q: The standard free energy change ΔG∘ and the equilibrium constant K for a reaction can be related by the ...
Sunday, November 16, 2014 at 9:47pm

Chemistry
Please help me set up these problems. I have been staring at them for hours and I can't tell where I went wrong. Question: Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (...
Sunday, November 16, 2014 at 9:43pm

Chemistry
Please help me with these problems, the book examples very different. I'm really confused. Any help with these will help me immensely. Thank you in advance! What I got were: 1.)c 2.)d 3.)a 4.)c 5.)b 1.) When is any endothermic reaction spontaneous? a.)When ΔSreaction...
Sunday, November 16, 2014 at 8:56pm

Chemistry
Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG&...
Sunday, November 16, 2014 at 8:55pm

Science, Chemistry
Write neutralization reactions for each of the following acids and bases. HNO3(aq) and Ba(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Sunday, November 16, 2014 at 8:39pm

Chemistry
If a solution contains 0.65mol of OH−, how many moles of H+ would be required to reach the equivalence point in a titration?
Sunday, November 16, 2014 at 8:01pm

Chemistry
Which bond in urea is most polar? (P.S. I tried C-O and N-C-O, but it's incorrect)
Sunday, November 16, 2014 at 7:51pm

Chemistry
what does the Lewis Dot Structure of Sr(CN)2 look like?
Sunday, November 16, 2014 at 7:18pm

chemistry
Consider the reaction, 3 H2(g) + N2(g) => 2 NH3(g). How many grams of NH3 will be made by the reaction of 3 moles of H2(g) with 18 moles of N2(g
Sunday, November 16, 2014 at 6:47pm

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2
Sunday, November 16, 2014 at 6:47pm

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of O2 are needed to make 432.7 g of H2O?
Sunday, November 16, 2014 at 6:47pm

chemistry
2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
Sunday, November 16, 2014 at 6:46pm

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 4.2 x 1023 molecules of N2? Give your answer to one decimal place.
Sunday, November 16, 2014 at 6:46pm

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 2.1 x 1024 molecules of N2?
Sunday, November 16, 2014 at 6:44pm

chemistry
Consider the reaction, 4 NH3 + 5 O2 => 4 NO + 6 H2O How many grams of NO will be made from 10.7 moles of O2?
Sunday, November 16, 2014 at 6:30pm

Chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 50 g of water at 20 oC and 50 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
Sunday, November 16, 2014 at 6:11pm

Chemistry
How many moles of CO2 will be made from 115.4 grams of C3H8?
Sunday, November 16, 2014 at 5:55pm

chemistry
100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml 50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. Molarity of cl ions in the resulting solution ...
Sunday, November 16, 2014 at 4:42pm

Chemistry
Estimate the percent ionic character of the BrF bond using this graph:
Sunday, November 16, 2014 at 4:34pm

Chemistry (Acid&Base)
How many mL of 0.203 M HCl(aq) are required to prepare a diluted solution that has a concentration of 0.0433 M in a 100-mL volumetric flask?
Sunday, November 16, 2014 at 4:10pm

chemistry Ben
50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. molarity of cl ions in the resulting solutions is At.wt of ba = 137 100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final...
Sunday, November 16, 2014 at 3:00pm

chemistry step by step for me
100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml. 50ml of 20.8% bacl2 and 100ml of 938% h2s04 solutions are mixed. Molarity of cl ions in the resulting solutions...
Sunday, November 16, 2014 at 2:35pm

Chemistry
Consider the reaction 2 SO2(g) + O2(g) in equilibrium with 2 SO3(g) . At 25°C delta H° = -197.78 kJ and delta S° = -187.95 J/K. Using this information, calculate the equilibrium constant for the reaction at -32°C. (R = 8.314 J/K) Enter your answer using TWO ...
Sunday, November 16, 2014 at 2:11pm

Chemistry
Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?
Sunday, November 16, 2014 at 6:25am

Chemistry
Write a balanced formula equation with phase indicators: Strong heating of copper(II) nitrate trihydrate produces copper (II) oxide, nitrogen dioxide, oxygen gas, and water (The part I'm confused about is how to write the molecular formula for copper (II) nitrate ...
Sunday, November 16, 2014 at 6:05am

Chemistry
8.5g of sample of iron required just 75cm3 of 3.00M HCl to dissolve it and give a neutral solution.Calculate the percentage purity of the sample of iron.
Sunday, November 16, 2014 at 5:50am

Chemistry
Suppose that 0.205 g of a mixture containing Na2SO4 and K2SO4 is dissolved in water. An excess of BaCl2 is added and a precipitate of 0.298 g of BaSO4 is produced. Calculate the percent by mass of Na2SO4 and K2SO4 in the original mixture.
Saturday, November 15, 2014 at 9:24pm

Chemistry
Suppose that 50.0 mL of a 0.250 M HCl solution is mixed with 50.0 mL of a 0.100 M Ba(OH)2 solution in a coffee-cup calorimeter. The temperature of the resulting solution increases by 1.76 oC . Calculate DH for the reaction between HCl (aq) and Ba(OH)2 (aq) in kJ per mole of Ba...
Saturday, November 15, 2014 at 9:23pm

Chemistry
Consider the following reaction AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) DH = -66 kJ Suppose that 100.0 mL of 0.100M AgNO3 is added to 200.0 mL of 0.100 M NaCl in a coffee cup calorimeter. Assuming that the initial temperature of the solution is 25.000C calculate ...
Saturday, November 15, 2014 at 7:03pm

Chemistry
Suppose that 1.048 g of benzene is combusted in a bomb calorimeter which contains 945 g of water. The temperature of the water increases from 23.640 OC to 32.681 oC. The heat capacity of the empty calorimeter is 891 J/ OC . C6H6 (l) + 15/2 O2 (g) > 3 H2O (l) + 6 CO2 (g) (a...
Saturday, November 15, 2014 at 7:02pm

Chemistry
In order to calibrate a bomb calorimeter , 3000 g of water is added to the calorimeter. next, 1.08 x 10-2mol of ethanol (C2H6O) is combusted in the presence of excess oxygen according to the equation, C2H6O (l) + 3 O2 (g) > 3 H2O (l) + 2 CO2 (g) DE = - 1365 kJ/mol . ...
Saturday, November 15, 2014 at 7:02pm

Chemistry
The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate ∆E° for the following reaction. H2O (l) → H2 (g) + 1/2 O2 (g)
Saturday, November 15, 2014 at 7:00pm

Chemistry
The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate DEO for the following reaction. H2O (l) → H2 (g) + 1/2 O2 (g)
Saturday, November 15, 2014 at 6:58pm

Chemistry
Identify the intermolecular attractive force(s) that must be overcome to vaporize CH3Cl(l).
Saturday, November 15, 2014 at 4:23pm

chemistry
If we assume that the energy-level diagrams for homonuclear diatomic molecules shown in Figure 9.42 in the textbook can be applied to heteronuclear diatomic molecules and ions, predict the bond order and magnetic behavior of CO+
Saturday, November 15, 2014 at 3:33pm

Chemistry
What is the molar mass of a gas (96.0 g) in a 25.0 L container at 27.0 °C? The pressure inside the container is 3.04E5 Pa.
Saturday, November 15, 2014 at 2:39pm

chemistry
How many joules of energy would be liberated by condensing 49.6 mol of steam at 100.0 °C and allowing the liquid to cool to 30.0 °C?
Saturday, November 15, 2014 at 2:31pm

chemistry
How many grams of the nonelectrolyte sucrose (molar mass -342 g / mole) must be added to 450 grams of water (molar mass 18.0 g / mole) to change the vapor pressure to 745 mm Hg at 100
Saturday, November 15, 2014 at 1:56pm

chemistry
If 124 g of ice at 0.0°C is added to 1.36 L of water at 90 °C, what is the final temperature of the mixture?
Saturday, November 15, 2014 at 1:10pm

chemistry
Exactly .203g of zinc metal is dissolved in dilute HCl(aq) in an ice calorimeter. The heat released melts enough ice to produce a volume change of 0.254mL in the ice water mixture surrounding the reaction vessel. Calculate the enthalpy change per mole of zinc for the reaction...
Saturday, November 15, 2014 at 1:07pm

chemistry
1. In an ice calorimeter experiment, what is the relationship between joules and volume change expressed in joules/mL of volume change? a.) The specific volume of H20(l) is 1.001mL/g b.) The specific volume of H2)(s) is 1.092mL/g c.) The latent heat of fusion of ice is 334 J/g...
Saturday, November 15, 2014 at 1:06pm

chemistry
Calculate the amount of heat absorbed when 58 g of steam at 117◦C are completely converted to ice at −32.5◦C. Specific Heat: H2O(s) = 2.09 J/g◦C H2O(l) = 4.18 J/g◦C H2O(g) = 2.03 J/g◦C Heat of Fusion = 334 J/g Heat of Vaporization = 2260 J/g...
Saturday, November 15, 2014 at 12:21pm

Chemistry
If 9560 J of energy were absorbed by 500. g of ice at 0.0 °C, what would be the final temperature? Can someone walk me through setting this up?
Saturday, November 15, 2014 at 11:44am

chemistry
The complete combustion of ethanol, C 2 H 5 OH (FW = 46.0 g/mol ), proceeds as follows: What is the enthalpy change for combustion of 15.0 g of ethanol?
Saturday, November 15, 2014 at 11:09am

chemistry
The tomato is dropped. What is the velocity, v , of the tomato when it hits the ground? Assume 91.9% of the work done in Part A is transferred to kinetic energy, E , by the time the tomato hits the ground.
Saturday, November 15, 2014 at 10:49am

Chemistry
In an experiment, a mixture of two gases occupies a volume of 3.00 L at a temperature of 22.5 degree centigrade. The mixture contains 14.0 g of water, 11.5 g of oxygen, and 37.3 g of nitrogen. Calculate the total pressure and the partial pressure of each gas?
Saturday, November 15, 2014 at 3:40am

Chemistry
N2O5 is an unstable gas that decomposes according to the following reaction: 2N2O3(g) ---> 4NO2(g) + O2(g) What would be the total pressure of gases present if a 10.0L container at 22.0 degree centigrade begins with 0.400 atm of N2O5 and the gas completely decomposes?
Saturday, November 15, 2014 at 3:37am

Chemistry
One way to generate oxygen is to heat potassium chlorate, KCLO3 (the other product is potassium chloride). If 386 mL of oxygen at 41 degree centigrade and 97.8 kPa is generated by this reaction, what is the minimum mass of KCLO3 used?
Saturday, November 15, 2014 at 3:33am

Chemistry
A sample of a smoke stack emission was collected into a 1.25L tank at 752 mm Hg and analyzed. The analysis showed 92% CO2, 3.6% NO, 1.2% SO2, and 4.1% H2O by mass. What is the partial pressure exerted by each gas?
Saturday, November 15, 2014 at 3:22am

Chemistry
A sample of a smoke stack emission was collected into a 1.25 L at 752 mm Hg and analyzed. The analysis showed 92% CO2, 3.6% NO, 1.2% SO2, and 4.1% H2O by mass. What is the partial pressure exerted by each gas?
Saturday, November 15, 2014 at 3:21am

Chemistry
For a gas sample whose total pressure is 740 torr, what are the partial pressures if the moles of gas present are 1.3 mol N2, 0.33 mol O2, and 0.061 mol Ar?
Saturday, November 15, 2014 at 3:18am

Chemistry
A cylinder containing 15.0 L of helium gas at a pressure of 165 atm is to be used to fill party balloons. Each balloon must be filled to a volume of 2.0 L at a pressure of 1.1 atm. What is the maximum number of balloons that can be inflated? Assume that the gas in the cylinder...
Saturday, November 15, 2014 at 3:16am

Chemistry
What is the molarity of a solution prepared by dissolving 820. g of sodium phosphate, Na3PO4, in water and diluting to 2.89 liters? (atomic masses: Na = 22.99, P = 30.97, O = 16.00)
Friday, November 14, 2014 at 10:56pm

chemistry (AP)
The heat of neutralization of HCl (aq) by NaOH is -55.9Kj/mol H2) produced. If 50ml of 1.6M NaOH at 25.15 celsius is added to 25ml of 1.79M HCl at 26.34 celsius in a plastic foam cup calorimeter, what will be solution temperature be immediately after the neutralization ...
Friday, November 14, 2014 at 9:52pm

chemistry
Assuming 100% dissociation, calculate the freezing point and boiling point of 0.700 mol of AgNO3 in 1.00 kg of water.
Friday, November 14, 2014 at 9:17pm

Chemistry
How many electrons can be described by the quantum numbers n = 2, l = 1, ml = -1? a.) 2 b.) 14 c.) 6 d.) 10 e.) 0 I thought it was 6 but here's my reasoning n = 2 energy levels l = 1 (p orbital) ml = -1 (I don't think this is relevant to the question?)
Friday, November 14, 2014 at 9:13pm

Chemistry
A 0.327 g sample of a mixture of NaOH(s) and NaCl(s) requires 31.5 mL of 0.150 M HCl(aq) to react with all the NaOH(s). What is the mass percentage of the NaOH(s) in the mixture?
Friday, November 14, 2014 at 3:39pm

Chemistry
What is the minimum amount of 6.0M H2SO4 necessary to produce 19.0g of H2(g) according to the reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g)
Friday, November 14, 2014 at 2:12pm

chemistry
How can we draw one of the shapes of molecule according to the VSEPR theory which is SO2?
Friday, November 14, 2014 at 9:05am

chemistry
what is the structure of OF anion?
Friday, November 14, 2014 at 5:32am

chemistry
You perform the following titration: You placed 35 mL of H2S in a flask and placed it under a buret. The buret contains 0.243M Sr(OH)2 and you are going to titrate the H2S with the base. You titrate until the color changes. At that point, you record that you used 10.15mL of ...
Friday, November 14, 2014 at 1:20am

chemistry
addition of 1.280g of zinc metal to 100mL of 0.3917 M HCl in a coffee-cup calorimeter causes the temperature to increase from 1 degrees celsius to 22.11 degrees celsius. What is the value of the change of Hrxn for the following equation: Zn(s) + 2HCl(aq)-->ZnCl2(aq) +H2(g) ...
Thursday, November 13, 2014 at 11:08pm

Chemistry
A) n=1 l=0 ml=0 ms=1/2 B) n=3 l=1 ml=-1 ms=1/2 C) n=2 l=0 ml=0 ms=-1/2 D) n=2 l=1 ml=0 ms=1/2 E) n=3 l=2 ml=0 ms=1/2 F) n=2 l=1 ml=1 ms=-1/2 Which of the above sets of quantum numbers could possibly describe an electron in the ground-state configurations of sulfur
Thursday, November 13, 2014 at 10:19pm

chemistry
How many formula units would there be in a 54.3 gram sample of sodium nitrate
Thursday, November 13, 2014 at 10:09pm

chemistry
how does one find out the moles of NaCl?
Thursday, November 13, 2014 at 9:28pm

Chemistry
I missed a few days of school due to a sick child. I'm reviewing for an exam and the following questions are giving me trouble as I wasn't there when they were reviewed in class. If possible, I need the answer and step-by-step process so I can see what what to do and ...
Thursday, November 13, 2014 at 9:15pm

Chemistry
I missed a few days of school due to a sick child. I'm reviewing for an exam and the following questions are giving me trouble as I wasn't there when they were reviewed in class. If possible, I need the step-by-step process. Thanks. 1.) If you put hydrogen peroxide on ...
Thursday, November 13, 2014 at 7:25pm

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