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October 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
what is the concentration in ppm of Ag in a 245 lb of Ore that contains 83.5 g of silver?
Saturday, October 4, 2014 at 9:15pm

chemistry
Identify the functional groups in menthol
Saturday, October 4, 2014 at 7:41pm

Chemistry
Weight of the Rock Salt Sample: .343 (g) Weight of the Rock Salt Solution: 9.910 (g) Trial #1 Trial #2 Trial #3 Weight of Rock Salt Solution Delivered (g) : .89 1.17 .786 Weight of AgNO3 Solution Delivered (g) : 1.53 .548 .786 Concentration of AgNO3 : 4.70e-4 (moles of AgNO3/g...
Saturday, October 4, 2014 at 5:46pm

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 4:28pm

chemistry
separation techniquesfor silver chloride and sodium trioxonitrate(v).and properties of the three state of matter.
Saturday, October 4, 2014 at 2:17pm

chemistry
properties of the three state of matter.and seperation techique for silver chloride and sodium trioxonitrate(v)
Saturday, October 4, 2014 at 2:16pm

Chemistry
Use Lewis diagrams to show how electrons are shared to form covalent bonds in compounds with the following atoms. Write the formulas a) one carbon atom and four chlorine atoms i think i would share each of the four electrons of carbon with the chlorine atom
Saturday, October 4, 2014 at 1:53pm

chemistry
The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x 102 L of oxygen?
Saturday, October 4, 2014 at 12:08pm

chemistry
How many atoms of oxygen are in 1.5L of carbon dioxide, CO2? (assume STP conditions)
Saturday, October 4, 2014 at 10:41am

chemistry
8.10 g metal combines with 7.20g of oxygen to form X2O3. What is the relativ e mass of X
Saturday, October 4, 2014 at 5:13am

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 12:51am

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
Saturday, October 4, 2014 at 12:02am

chemistry
Use activity coefficients to find the concentration of hydrogen ions in a solution of 90.0 mM butanoic acid and 0.05 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. How do I calculate the ionic strength ...
Friday, October 3, 2014 at 11:13pm

chemistry
The rock in a lead ore deposit contains 84% PbS by mass. How many kilograms of the rock must be processed to obtain 2.3 kg of Pb? WebAssign will check your answer for the correct number of significant figures. kg
Friday, October 3, 2014 at 9:54pm

Chemistry
A buffer contains 0.50 mol CH3CO2H and 0.50 mol CH3CO2- diluted with water to 1.0 L. How many moles of NaOH are required to increase the pH of the buffer to 5.00? (pKa for CH3CO2H = 4.74)
Friday, October 3, 2014 at 9:26pm

chemistry
a.) Write the balanced complete combustion reaction for ethane (C2H6), producing CO2 and water vapour. Make sure to include phases. Also, make sure that the stoichiometric coefficients are whole numbers and are not fractions. b.) What is the enthalpy of reaction (ΔH°...
Friday, October 3, 2014 at 7:48pm

chemistry
what concentration of Br- results when 831 mL of 0.747 M HBr is mixed with 611 mL of 0.561 M FeBr2
Friday, October 3, 2014 at 7:45pm

chemistry
Gaseous methane CH4 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 0.481 g of methane is mixed with 2.9 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure ...
Friday, October 3, 2014 at 7:35pm

chemistry
The density of (Hg) is 13.53 g/mL. How many liters will 4.2x10^21 atoms of Hg occupy?
Friday, October 3, 2014 at 6:37pm

chemistry
what ions are present in AgNO2 + (NH4)SO4 I have Ag and N and H SO is a solid formed? no?
Friday, October 3, 2014 at 6:24pm

chemistry
Suppose you find chunk of what appears to be gold in the sand at the beach. devise a simple experiment to determine whether or no you're struck it rich. Please list all lab equipment required and list the specific steps you would take
Friday, October 3, 2014 at 4:36pm

chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
Friday, October 3, 2014 at 4:09pm

Chemistry
What is the maximum mass of TiCl4 that can be obtained from 79.0 g TiO2, 37.9 g Cl2 and excess carbon? Please show all your steps. 3 TiO2(s) + 6 Cl2 + 4 C(s) --> 3 TiCl4(g) + 2 CO2(g) + 2 CO(g) Molar Masses:TiO2-79.88, Cl2-70.90, TiCl4-189.68
Friday, October 3, 2014 at 4:00pm

chemistry 101
What alcohol(s) could be used to produce each of the following compounds? Enter the IUPAC names of the alcohol(s). If there are more than one alcohol, enter them separated with commas. 1.CH3-CH2-O-CH2-CH3 2.CH3-CH2-C=CH-CH3 ..........| ..........CH3. 3.pentagon with a double ...
Friday, October 3, 2014 at 1:10pm

Chemistry
Potentiometric Acid-Base Titration: The tasks to be performed in Experiment #6 include: A. Preparation of a 0.05 M solution of sodium hydroxide (titrant solution). B. Standardization of the titrant solution. C. Calibration of the pH-meter. D. Determination of 2-acetoxybenzoic ...
Friday, October 3, 2014 at 11:46am

Chemistry
Explain the advantages of a potentiometric titration over titrations that use colored indicators.
Friday, October 3, 2014 at 11:43am

Chemistry
If we take 2.2 grams of CO2, 6.02 X 1021 atomes of nitrogen and 0.03 gram atoms of sulphar , then the molar ratio of C, N, and O is . answer is 5:1 :3 how to solve it help please , thanks
Friday, October 3, 2014 at 10:54am

Chemistry
Equal weights of methane and hydrogen are mixed in an empty container at 25 C. the fraction of total pressure exerted by the hydrogen is? answer is 1/9 i want to know that how to find out this answer thanks?
Friday, October 3, 2014 at 10:16am

Chemistry
Among the following electrons, which has highest energy? a. n = 3, l = 2, m = 0, s = + 1/2 b. n = 4, l = 0. m= 0 , s = - 1/s answer is A. but i want to know that how to get this answer help please?
Friday, October 3, 2014 at 10:14am

Chemistry
Nitrogen dioxide decomposes on heating according to the following equation 2NO2 (g) ↔ 2NO (g) + O2 (g) When 4 mole of nitrogen dioxide were put into a 1dm3 container and heated to a constant temperature, the equilibrium mixture contained 0.8 mole of oxygen. What is the ...
Friday, October 3, 2014 at 8:25am

.Chemistry Help please?
This type of question come in our exams usually that. If the Reaction P+Q → R + S is described as being of zero order with respect to P, it means that. Answer: THE RATE OF REACTION IS INDEPENDENT OF THE CONCENTRATION OF P. I want to ask that, what is such thing in this ...
Friday, October 3, 2014 at 7:01am

chemistry
state four differences between acid-base indicators and universal indicators
Friday, October 3, 2014 at 1:58am

Chemistry
Many important metals occur as sulfide, arsenide, and antimonide minerals, especially in the Sudbury mineral complex. The first step in processing these ores involves “roasting” the ore in air to produce the metal or metal oxide, along with nonmetal oxides that can ...
Thursday, October 2, 2014 at 11:31pm

chemistry
Light travels at the speed of3.0x10^10 cm/sec. what is the speed of light in feet per hour? I'm not sure on how to start it.
Thursday, October 2, 2014 at 10:45pm

Chemistry
Aluminum oxide is formed by reaction of excess oxygen with aluminum. 4 Al(s) + 3 O2(g) -> 2 Al2O3(s) Calculate the mass of aluminum required to form 18.2 kg of aluminum oxide if the reaction has a percent yield of 83.4%.
Thursday, October 2, 2014 at 10:19pm

chemistry
luminum oxide is an important starting material for making cryolite, Na3AlF6 (a compound used to give fireworks their yellow colour). First the aluminum oxide is synthesized from aluminum and then reacted with sodium hydroxide and hydrogen fluoride gas. If 2.6 Mg of aluminum ...
Thursday, October 2, 2014 at 10:19pm

Chemistry
Silver chromate may be prepared by the following reaction. 2 AgNO3(aq) + K2CrO4(aq)  Ag2CrO4(s) + 2 KNO3(aq) Calculate the mass of silver chromate produced when 0.623 L of 1.345 M silver nitrate is reacted with 245 mL of 1.89 M potassium chromate.
Thursday, October 2, 2014 at 10:15pm

Chemistry
Freon-12 is formed as follows: 3 CCl4 + 2 SbF3 -> 3 CCl2F2 + 2 SbCl3 150 g tetra chloromethane is combined with 100 g antimony (III) fluoride to give Freon-12 (CCl2F2). Identify the limiting and excess reagents, and calculate how many grams of Freon-12 can be formed.
Thursday, October 2, 2014 at 10:07pm

Chemistry
What amount of energy is required to melt a 27.4 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice 9.12e3 = J What amount of energy must be removed from 123 g of water to cool it from 71.6oC to 9.41oC? Specific heat of water = 4.184 JK-...
Thursday, October 2, 2014 at 9:28pm

chemistry
in an experiment, 24g of magnesium metal reacts with 73g of hydrogen chloride solution to produce hydrogen gas and 95g of magnesium chloride. Write the word, skeletal and balance eqautions
Thursday, October 2, 2014 at 8:18pm

Chemistry
What is the number of double or triple bonds in the formula C3H8? What is the number of lone pairs Around each atom? And what is the number of single covalent bonds? I also need help with the formula C3H6O with the same questions! For C3H8 I got 10 single covalent bonds. And ...
Thursday, October 2, 2014 at 6:38pm

chemistry, biotechnology
The question is: "The molar extinction coefficient of pure antibody is 1.4 absorbance units per milligram antibody @280nm. You have a concentrated antibody solution, so you make a 5-fold dilution and measure @280, getting an absorbance of 0.845. What is the concentration ...
Thursday, October 2, 2014 at 6:24pm

chemistry
For the adiabetic expansion of an ideal gas a) does the gas do work? B) doesd the internal energy of the gas increase, decrease or remain constant? C) what happens to the temperature? Please check my answers A) yes the gas does work because it is expanding B) internal energy ...
Thursday, October 2, 2014 at 6:07pm

Chemistry
What is the final temperature, in oC, after a 27.0 g piece of ice, at 0oC, is placed in a styrofoam cup with 120 g of water initially at 70.5oC. Assume there is no transfer of heat to or from the surroundings. The specific heat of water = 4.184 JK-1g-1 The heat of fusion of ...
Thursday, October 2, 2014 at 5:35pm

Chemistry
1)what potential impurities were removed during solventless aldol recrystallzation? 2) two solids with different identities are frequently mixed together & do not melt, why do you suppose that the solids actually melted? (why do you assume that it has been melted)
Thursday, October 2, 2014 at 3:52pm

chemistry
1) what potential impurities were removed during recrystallzation? 2) two solids with different identities are frequently mixed together & do not melt, why do you suppose that the solids actually melted?
Thursday, October 2, 2014 at 2:12pm

chemistry
1. A sample weighing 1.30 mg was analyzed to determine the concentration of a certain compound (FW =292.16 g/mol) using UV/Visible spectrometry. First, the sample was dissolved in 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.0 mL volumetric flask ...
Thursday, October 2, 2014 at 12:50pm

chemistry
A student mixes 4 reagents together thinking that the solution will neutralize each other . The solutions are mixed together are 50 ml of 0.100 M .hydrochloric acid 100 ml of 0.200 M of nitric acid 500 ml of 0.0100 M calcium hydroxide and 200 ml of 0.100 M of rubidium ...
Thursday, October 2, 2014 at 3:02am

chemistry
530 mL solution 10% HCl has been spilt onto the bench. It cannot be diluted or washed away. How much of the granular NaOH from the container seen in a must be used to neutralise the acid? [Using NaOH: MM = 40 g/mol] 1. I have NaOH + HCl --> NaCl + H2O. 10% HCI in a 530ml ...
Thursday, October 2, 2014 at 2:30am

chemistry
530 mL solution 10% HCl has been spilt onto the bench. It cannot be diluted or washed away. How much of the granular NaOH from the container seen in a must be used to neutralise the acid? [Using NaOH: MM = 40 g/mol]
Thursday, October 2, 2014 at 1:30am

Chemistry 104
A student has 10.0mL of phosphate solution that contains 1.0M PO4{3-}.The Student reacts this with excess ammonium & magnesium under basic conditions to produce 2.2034g of struvite. Calculate the % yield.
Thursday, October 2, 2014 at 12:39am

Chemistry 30
Complete the following reactions by moving only one proton at a time. Identify the acid (A) and the base (B) on the left-hand side of the equation, and the conjugate acid (CA) and the conjugate base (CB) on the right-hand side of the equation, according to Bronsted-Lowry ...
Thursday, October 2, 2014 at 12:12am

Chemistry 30
50.0 mL of 0.200 M NaOH neutralized 20.0 mL of sulfuric acid. Determine the concentration of the acid. Show a balanced chemical equation, all work, and the answer rounded to three decimal places.
Thursday, October 2, 2014 at 12:11am

chemistry
What is the volume of 6M H2SO4 required by the balanced equation to react with the CuO to produce 0.025 moles of copper(ii) sulfate. Report the volume needed BEFORE allowing for excess in milliliters to two significant figures. Don not include units in the answer box.
Wednesday, October 1, 2014 at 11:19pm

Chemistry
To make 1.5 L of 0.1 M NaCl from a 2.52 M stock solution, you would need to take ____ mL of the stock solution and add _____ mL of water.
Wednesday, October 1, 2014 at 11:02pm

Chemistry
Iron reacts with HCl solution to give H2 gas and Fe2+ ions. Suppose that 3.6 g of iron are to be dissolved in 1.2 M HCl. What is the minimum volume (in mL) of the acid solution required to react with all of the iron?
Wednesday, October 1, 2014 at 9:39pm

science, chemistry, biotechnology
"You're creating a standard curve for pyruvate. You need to create a standard with 20 micromoles in a cuvette. How much 100 mM pyruvate would you need?" My understanding is to solve for VOLUME using the equation: micromoles = (mM)(volume in ml) 20 micromoles = (...
Wednesday, October 1, 2014 at 9:25pm

Chemistry
a) Name the colors of visible light (the colors of the rainbow) in order of increasing energy. Indicate the approximate wavelength associated with each color. b) When excited, elemental sodium gives off a distinctive color that is used often in street lighting. What is the ...
Wednesday, October 1, 2014 at 8:56pm

Chemistry
Calculate the number of moles in 8.50x1015 atoms of 4He.
Wednesday, October 1, 2014 at 8:37pm

Chemistry
Calculate the number of moles in 2.65x1015 atoms of 14C.
Wednesday, October 1, 2014 at 8:04pm

chemistry
A given sample of a xenon fluoride compound contains molecules of the type XeFn where n is some whole number. Given that 9.03 × 1020 molecules of XeFn weighs 0.368 g, determine the value for n in the formula.
Wednesday, October 1, 2014 at 7:46pm

Chemistry
The combustion of hexane can be represented by the following equation: __C6H14 (g) + __O2(g) → __CO2(g) + __H2O(g) What is the mass of carbon dioxide produced?
Wednesday, October 1, 2014 at 7:04pm

chemistry
How many milliliters of a substance with a specific gravity of 0.88 would be needed to have 0.75 pounds of it?
Wednesday, October 1, 2014 at 6:49pm

Chemistry/Math
convert 0.01403 grams to ppm please show all step
Wednesday, October 1, 2014 at 6:07pm

chemistry
state the separation technique for silver choride and sodium trioxonitrate
Wednesday, October 1, 2014 at 5:14pm

Chemistry
A solution contains Cr3+ ion and Mg2+ ion. The addition of 1.00 L of 1.55M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.9g .Find the mass of Cr3+ in the original solution.
Wednesday, October 1, 2014 at 4:58pm

chemistry
A solution is prepared by placing 23.9 g of KCl in a 0.500 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 27.9 mL of the KCl solution react exactly with 45.0 mL of the AgNO3 solution?
Wednesday, October 1, 2014 at 3:00pm

chemistry
a system consisting of 1.5 mol CO2(g), initially at 15deg and 10 atm and confined to a cylinder of cross-section 10.0 cm2. it is allowed to expand adibatically against an external pressure of 1.0 atm until the piston has moved through 20 cm. assume that carbon dioxide may be ...
Wednesday, October 1, 2014 at 2:52pm

Chemistry
-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion
Wednesday, October 1, 2014 at 1:14am

chemistry
A 30 ml sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration is 0.0300 M give some possible identities for the unknown base
Wednesday, October 1, 2014 at 12:40am

chemistry
10 ml sample of vinegar an aqueous solution 0f acetic acid( HC2H3O2) is titrated with 0.5062 M and 16.58 ml is required to reach equivalence point what is the molarity of the acetic acid b. if the density of vinegar is 1.006 g/cm3 what is the mass percent of acetic acid of ...
Tuesday, September 30, 2014 at 11:03pm

Chemistry
If you are given a photoelctronic spectrum with just the peaks, how do you identify the element that would produce it?
Tuesday, September 30, 2014 at 10:22pm

solution making/ chemistry/biotech
how much of a .2M solution can you make with 340 g of calcium carbonate ( MW=100.0869) Do I multiply 340g by 1mole/MW
Tuesday, September 30, 2014 at 10:02pm

Chemistry
Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 20.0 g of...
Tuesday, September 30, 2014 at 9:50pm

chemistry
Naturally occurring silicon exists as 3 isotopes: 28Si, 29Si, and 30Si, whose atomic masses are 27.9769, 28.9865, and 29.9838, respectively. The most abundant isotope is 28Si, which accounts for 92.23% of naturally occurring silicon. Given that the average atomic mass of ...
Tuesday, September 30, 2014 at 9:45pm

Chemistry
How many grams of solid silver nitrate would you need to prepare 240.0mL of a 0.160M AgNO3 solution?
Tuesday, September 30, 2014 at 8:06pm

chemistry
Complete and balance each of the following equations. K2SO4(aq)+BaBr2(aq)→ Would it be K2SO4(aq)+BaBr2(aq)→K2Br2 +SO4Ba? Express your answer as a chemical equation. Enter no reaction if no precipitate is formed. (How can we know if a solid is formed in the product?)
Tuesday, September 30, 2014 at 7:42pm

chemistry
A solution contains an unknown amount of dissolved magnesium. Addition of 5.34×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in the solution.
Tuesday, September 30, 2014 at 7:19pm

Chemistry
HELP PLEASE. I have no idea how to set this up. I tried using the q=mc(change in temp) equation but its not working out. A 59.8 g block of an unknown metal at 87.5 degrees Celsius was dropped into an insulated vesssel containing approximately 33 g of ice and 23 g of water at 0...
Tuesday, September 30, 2014 at 7:00pm

chemistry
Calculate the air concentration (mol/l) of phenol in equilibrium with solution including 100 g/m3 of phenol.(T=25 C)
Tuesday, September 30, 2014 at 6:47pm

college chemistry
a 1.0kg sample of metal with a specific heat of 0.50KJ/Kg C is heated to 100.0C and then placed in a 50.0g sample of water at 20.0C . What is the final temperature of the metal and the water?
Tuesday, September 30, 2014 at 5:31pm

Chemistry
An aqueous stock solution is 85.0% H2SO4 by mass and its density is 1.83 g/mL. What volume of this solution is required to make 1.00 L of 1.35 mol/L H2SO4(aq)? Give your answer in millilitres, accurate to three significant figures.
Tuesday, September 30, 2014 at 4:27pm

Chemistry
Identify the following chemical equations by type. 1. If an electric discharge produces 800 cm3 of ozone (O3), how many cm3 of oxygen (O2) are required? 3O2(g) ---> 2O3(g) 2. When 75.0 dm3 of O2 react with an excess of glucose (C6H12O2), according to the reaction below, ...
Tuesday, September 30, 2014 at 3:05pm

chemistry 101
Give the name of the product from complete hydrogenation of 2-ethyl-1-hexene
Tuesday, September 30, 2014 at 1:42pm

Chemistry
How many grams of HCl are produced if the following reaction yielded 27.1 grams of H3PO4? PCl5 + 4 H2O --> H3PO4 + 5 HCl
Tuesday, September 30, 2014 at 1:22pm

chemistry
Household bleach contains (NaClO)2 that decomposes in water, NaClO + h2o = Na+ + OH- + Cl2 + O2 If 15ml bleach containing 5.85℅ NaClO is allowed to decomposes completely, then hoe many mL of o2 at 22C and 755mmHg can be liberated. Density of bleach= 1.12g/ml Answer I ...
Tuesday, September 30, 2014 at 1:10pm

Chemistry
Chemistry question: Given: CH4 + 2O2 ~ CO2 + 2H2O C - H = 99 kcal O - O = 119 kcal C = O = 192 kcal O - H = 111 kcal Calculate the change in energy for the CH4 - O2 system.
Tuesday, September 30, 2014 at 9:13am

Chemistry
Accurately weigh 0.9-1.1 g into a 200 mL beaker. Dissolve the KIO3 in a small amount of distilled water. Quantitatively transfer, with rinsing, to a 500 mL volumetric flask. Dilute to the calibration mark and shake well. Rinse the buret several times with small portions of the...
Tuesday, September 30, 2014 at 9:02am

chemistry
50g of watermelts at 0 degrees .what is the change in entropy of the water
Tuesday, September 30, 2014 at 6:55am

Chemistry 30
A mixture of 2.5 moles of H2O and 100 g of C are placed in a 50.0 L container and allowed to come to equilibrium in the following reaction: C(s) + H2O(g)  CO(g) + H2(g) The equilibrium concentration of hydrogen gas is found to be 0.040 M. What is the ...
Tuesday, September 30, 2014 at 1:21am

Chemistry 30
Consider the following reaction at equilibrium: 4NH3(g) + 5O2(g) ↔ 4NO(g) + 6H2O(g) In what direction will the following changes force the reaction? a) Addition of O2 b) Reduction of the amount of water vapour c) Increase in the pressure d) Decrease in the volume e) If ...
Tuesday, September 30, 2014 at 1:19am

PLEASE CHECK! ELA
Which word group is a complete sentence? A- Almost all the swimmers following the rules. B- Never had any interesting activities. C- After Chris finished chemistry experiment. D- Only two of the chairs matched the table. My guess is D.
Monday, September 29, 2014 at 10:32pm

Chemistry- Answer Check
In an ideal gas, if only one molecule in a thousand has enough energy to react, how can all molecules in a reactor be consumed? My answer: when the one molecule reacts, it causes the other molecules to gain energy. Is this right? I'm still confused on the question
Monday, September 29, 2014 at 10:03pm

Chemistry
A solution contains 5.6g of solute in 16 cm cubed of water. When the solution is cooled, crystals begin to appear at 11 degrees celsius. What is the solubility of the solute at 11 degrees celsius?
Monday, September 29, 2014 at 9:19pm

chemistry
The density of silver is 1.050×104 kg/m3. What is the mass of a rectangular ingot of silver with dimensions 1.00 cm × 4.00 cm × 0.780 dm? How do I get started? I really do not understand.
Monday, September 29, 2014 at 7:48pm

Chemistry
we would build one spectrometer apparatus with webcam to analyze two different beers based on yeast or bitterness so which one would be easy/less time to analyze yeast or bitterness ? please expalin why :S
Monday, September 29, 2014 at 6:50pm

Chemistry - Titrations
What volume (mL) of 0.2650 N H3PO4 is required to neutralize: a) 35.25 mL of 0.2300 M KOH b) 19.14 mL of 0.2300 M NH4OH Unfortunately, the teacher didn't get the opportunity to teach us titrations in class today, but this problem (and more) are still due by 11 pm tonight (...
Monday, September 29, 2014 at 6:02pm

Chemistry: Please check my answer
ClO2 is sometimes used as a chlorinating agent for water treatment. Cl2 + 4 NaClO -> 4 NaCl + 2 ClO2 In an experiment, 1L Cl2 measured at 10C and 4.66atm is dissolved in .75L of 2.00M NaClO. If 25.9g of pure ClO2 is obtained, then what is the percent yeild for this ...
Monday, September 29, 2014 at 4:59pm

Chemistry
Al and Fe react with HCl to produce a chloride salt and hydrogen gas. A .1924g sample of a mixture of Al and Fe is treated with excess HCl solution. A volume of 159mL h2 gas is collected over water at 19C and 841 torr. What is the mass percent by mass of Fe in the mixture? The...
Monday, September 29, 2014 at 2:21pm

chemistry
A mixture of 3.00 g of silver and copper metals was dissolved in excess nitric acid. Resulting salts, silver(I) nitrate and copper(II) nitrate, were isolated and dissolved in enough water to make 0.100 L of a solution with a total concentration of the nitrate ion equal to 0....
Monday, September 29, 2014 at 11:42am

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