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September 21, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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CHEMISTRY
I have trouble finding out the oxidation number of each element in the : [Cr(N2h4CO)6]4[Cr(CN)6]3
Wednesday, July 9, 2014 at 5:58am

CHEMISTRY
I have these equations in our book , but I've tried a few times to solve it in half reaction method , but I couldn't yet : 1) KMnO4 + KIO3 => MnO2 + KIO4 ( in a basic solution ) 2) MnO4- + Cl- => Mn^+2 + HClO ( in a acidic solution ) I think these are incorrect...
Wednesday, July 9, 2014 at 5:56am

chemistry
FIND THE PERCENTAGE BY VOLUME COMPOSITION OF A VINEGAR SOLUTION CONTAINING 10cm (TO THE POWER OF 3) OF ACETIC ACID AND 190 (TO THE POWER OF 3)OF H2O
Wednesday, July 9, 2014 at 4:40am

chemistry
if you need 50.0 grams of lead2 chloride how much magnesium chloride would you need?
Wednesday, July 9, 2014 at 12:34am

chemistry
What is the mass of water obtained when mix 100.0 mL of 2.5 M. HNO3 with 100.0 mL of 2.55 M. KOH?
Tuesday, July 8, 2014 at 8:49pm

CHEMISTRY
Balance the oxidation reduction equation in half reaction PbO2 + KCl => KClO + KPb(OH)3 thank you a lot
Tuesday, July 8, 2014 at 2:25pm

Chemistry
How many milliliters of O2 are consumed in the complete combustion of a sample of hexane, C6H14, if the reaction produces 325 mL of CO2? Assume all gas volumes are measured at the same temperature and pressure. The reaction is 2C6H14(g) + 19O2(g) -> 12CO2(g) + 14H2O(g)
Tuesday, July 8, 2014 at 12:50pm

Chemistry
A mixture of ammonia and oxygen is prepared by combining 0.330 L of NH3 (measured at 0.790 atm and 22°C) with 0.210 L of O2 (measured at 0.820 atm and 48°C). How many milliliters of N2 (measured at 0.740 atm and 100. °C) could be formed if the following reaction ...
Tuesday, July 8, 2014 at 12:48pm

Chemistry
When a sample of neon with a volume of 683 mL and a pressure of 0.792 atm was heated from 19.0 to 76.0 °C, its volume became 733 mL. What was its final pressure (in atm)?
Tuesday, July 8, 2014 at 12:47pm

Chemistry
Methane is formed in landfills by the action of certain bacteria on buried organic matter. If a sample of methane collected from a landfill has a volume of 200. mL at 741 torr and 27.2 °C, how many grams of methane are in the sample?
Tuesday, July 8, 2014 at 12:47pm

Chemistry
A mixture of N2, O2, and CO2 has a total pressure of 928. torr. In this mixture the partial pressure of N2 is 31.0 cm Hg and the partial pressure of O2 is 4.00 dm Hg. What is the partial pressure of the CO2 (in torr)?
Tuesday, July 8, 2014 at 12:47pm

Chemistry
A 56 g sample of peanut oil has a volume of 60.9 cm^3. Calculate the density of the peanut oil.
Tuesday, July 8, 2014 at 12:42pm

chemistry
A student didn’t read step 4 in the procedure and assembled the cells based on Figure 1, connecting the device to the ammeter right away. When she gets to step 5 she realizes her error, but instead of estimating the initial reaction time she simply notes note the current ...
Tuesday, July 8, 2014 at 9:46am

chemistry
When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g), if 48.6 g of Mg and 150.0 g of HCl are allowed to react, ...
Tuesday, July 8, 2014 at 9:31am

CHEMISTRY
Why the oxidation number of ( H ) is -1 in 1) N2H4 2) CaH2 while ( N ) is different from ( Ca ) ?
Tuesday, July 8, 2014 at 8:53am

CHEMISTRY
In half reaction method of the chemical equation balancing , how about those redox reactions that they don't contain any (H) and ( O ) atoms ?
Tuesday, July 8, 2014 at 8:01am

CHEMISTRY
In relative oxidizing and reducing agents table ; 1) Is Al oxidized by Ni+2 2) Is Cu oxidized by Ag+ 3) Is Pb oxidized by Na+ 4) Is F2 reduced by Cl- 5) Is Br2 reduced by Cl- and if you or no , how it is as a rule to predict any ? thank you
Tuesday, July 8, 2014 at 7:58am

CHEMISTRY
Assume that the ( S ) ( S ; alphabet ) is the solubility in mol/L of AB2 compound , , then what is the concentration of A and B ? and what is the Ksp of AB2 compound ? thank you a lot
Tuesday, July 8, 2014 at 2:56am

CHEMISTRY
The Ksp of (hydroxyapatite ) Ca5(PO4)3OH is 6.8 * 10^-37 , and its molar concentration is 2.7 * 10^-5 mol/L ,, if this (hydroxyapatite) reacts with fluoride , then the F- ions replace OH- ions and the product is Ca5(PO4)3F ,, if we know the Ksp of ( fluoroapatite ) is 1.0 * 10...
Tuesday, July 8, 2014 at 2:53am

chemistry
Calculate the value of q for each of the experiments listed below. (Assume the heat capacity of water is 4.1801 J/g*C). Exp1: 2.48g of an unknown salt added to 160. mL of water resulted in a change of temperature of -0.1 C. Exp2: 2.48g of an unknown salt added to 160. mL of ...
Monday, July 7, 2014 at 8:53pm

chemistry
Balance by oxidation method the SO2 + MnO4+H2O --MnSO4+H2SO4+SO4(-2)
Monday, July 7, 2014 at 7:30pm

chemistry
Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations you made over the course of Part I. Aluminum Measured Mass of Metal 41.66 g Distilled Water Measurement 25 mL Distilled Water Temperature 25 C ...
Monday, July 7, 2014 at 4:37pm

chemistry
What are the consequences of using only a very dilute solution of HCl or a very concentrated solution of HCl in attempting to return the pH? in attempting to return the pH to 7? What is a better alternative?
Monday, July 7, 2014 at 3:34pm

chemistry
2HCl + Mg ---> H2 + MgCl2 How can I differ what is what? 2HCL= Mg = --- H2 = MgC12 =
Monday, July 7, 2014 at 3:26pm

chemistry
The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is?
Monday, July 7, 2014 at 12:46pm

chemistry
a concrete block is heated from by 30 degree C to 50 degree C. The mass of the block is 10kg. Specific heat of concrete is 800J/Kg degree Celcius. Calculate the energy transferred.
Monday, July 7, 2014 at 11:54am

CHEMISTRY
Does it produce precipitate if 1.7 g of AgNO3 and 14.5 g of NaCl solvated in 200 mL water to get a solution in 25 oC ? thank you
Monday, July 7, 2014 at 10:32am

CHEMISTRY
If 2.5 * 10^-2 g of Fe(NO3)3 added to 100mL of 1.0 * 10^-4 M NaOH solution , will it produce precipitate ? thank you
Monday, July 7, 2014 at 10:27am

chemistry
The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is?
Monday, July 7, 2014 at 9:50am

chemistry
4g NaOH is dissolved in 100mL of 2.5M H2SO4 will be required for its complete neutralization?
Monday, July 7, 2014 at 9:11am

Chemistry
If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2-, and 0.006 M H+, What is the Ka of the acid? What is the ph of the solution at the concentrations given? What would happen to the equilibrium position if more CHO2- were added to the solution?
Monday, July 7, 2014 at 9:01am

chemistry solution preparations
how can we prepare 0.5 n solution of hcl as we have 37% hcl and 0.1n hcl. and we want to make 0.5n hcl from 0.1n hcl by pouring 37% hcl?
Monday, July 7, 2014 at 6:06am

CHEMISTRY
Which conditions ( reactant concentration , pressure , and temperature ) elevate high concentration of the underlines in these following equilibrium systems : 1) 2CO + O2 <==> 2CO2 + 167 kJ 2) Cu^+2 + 4NH3 <==> [ Cu(NH3)4 ]^+2 + 24 kJ 3) 2HI + 12.6 kJ <==> H2...
Monday, July 7, 2014 at 4:58am

CHEMISTRY
We have this following gas equilibrium : H2 + Cl2 <==> 2HCl + 184 kJ then predict the following to know Le chatlier's prediction 1) adding Cl2 2) removing HCl 3) elevation of pressure 4) lowering of the temperature 5) removing H2 and lowering pressure 6) adding ...
Monday, July 7, 2014 at 4:31am

chemistry, biology
Calculate the pH of a solution obtained by adding 20 mL of .2M KOH to 480 mL to .02M isoelectric glycine
Sunday, July 6, 2014 at 11:25pm

chemistry
How many mol of Argon is required to exert a pressure of 1.00 MPa at 50 ºC in a vessel that has a volume of 14 litres? (R = 8.314 J K^-1 mol^-1)
Sunday, July 6, 2014 at 9:02pm

chemistry
What is the volume of 14 mol of ideal gas if its pressure is 233 kPa and its temperature is 140 ºC? (1 mol of ideal gas at STP occupies 22.4 L).
Sunday, July 6, 2014 at 9:01pm

chemistry
2.00 m^3 of nitrogen gas at 14 ºC and 100 kPa is compressed to occupy 0.50 m^3. and its temperature rises to 42 ºC. Calculate the new pressure of the gas
Sunday, July 6, 2014 at 9:01pm

chemistry
calculate the mass of water contained in 4.021 m^3 of saturated air at 27 ºCgiven that the saturate d vapour pressure of water at 27 ºC is 3.53 kPa. (RMM of water is 18.02, R = 8.314 J K-1 mol^-1
Sunday, July 6, 2014 at 9:00pm

Chemistry
Express the concentration of a 0.0900 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.
Sunday, July 6, 2014 at 8:53pm

chemistry step by step for thank a lot
10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of caco3. The answer 1000 who helps me to solve it for me step by step thank a lot
Sunday, July 6, 2014 at 7:39pm

chemistry step by step for me thank a lot
What is the weight of ca(oh)2 required for 10 litre of water remove temporary hardness of 100 ppm due to ca(H03)2 The answer 0.74 Thank all tutors for your help Pls show step by step for me
Sunday, July 6, 2014 at 3:29pm

chemistry step by step thank a lot
342gm of 20% by mass of ba (OH)2 solution sq gr 0.57 is reacted with 1200ml of 2M hn03. If the final density is same as pure water then molarity of the ion in resulting solution by nature of the above solution is dentified 0.888m Who solve it for me step by step thank a lot
Sunday, July 6, 2014 at 2:15pm

Chemistry
When 3.15 g of a nonelectrolyte solute is dissolved in water to make 135 mL of solution at 21 °C, the solution exerts an osmotic pressure of 869 torr. What is the molar mass of the solute? What is the molar concentration of the solution? How many moles of solute are in the...
Sunday, July 6, 2014 at 1:38pm

Soil Chemistry
Understanding the strengths of carbon halogen bonds can help us to understand the behavior of CFCs and related molecules. Arrange the members of the set of carbon halogen bonds shown below in the order of bond strength. A) carbon dioxide B) methane C) ozone D) water A) c > ...
Sunday, July 6, 2014 at 11:01am

chemistry
What must be the velocity of a beam of electron if they are to display a de broglie wavelength of 1A°?
Sunday, July 6, 2014 at 7:59am

CHEMISTRY
The enthalpy change of an endothermic reaction is 8 kJ , and this reaction is spontaneous at 25 oC ,, what is the expected entropy change ? thank you a lot
Sunday, July 6, 2014 at 5:15am

CHEMISTRY
Find the specific heat of indium , if any one mole absorbs 23 J , when the temperature elevates from 297.5 K to 299.5 K thank you so much
Sunday, July 6, 2014 at 5:05am

chemistry
name the gas evolved when dil. Hcl reacts with sodium hydrogen cabonate. how it is recongnised ?
Sunday, July 6, 2014 at 3:46am

chemistry step for step thank a lot
10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of cac03. The answer 1000 I think ppm= 1mg/1L 10L x 100g/mol cac03 = 1000 Who check it for me step by step Thank all tutors for your help. How many ml of a 0.05M kmno4 solution are ...
Saturday, July 5, 2014 at 8:56pm

chemistry
during an effusion experiment, oxygen gas passed through a tiny hole 2.5 times faster than the same number of moles in another gas under the same conditions. What is the molar mass of the unknown gas?
Saturday, July 5, 2014 at 4:04pm

Chemistry
A solution of ethanol has a concentration of 4.613 mol/L at 20ºC. The density of the solution is 0.9667 g m/L.. Calculate the molality of the solution..please show the solution..thanks a lot
Saturday, July 5, 2014 at 3:58pm

Chemistry
Commercial hydrobromic acid can be purchased as 40.0 % by mass 9f HBr. The density of this acid is 1.38 g m/L. Calculate the molality of this commercial acid..please show me the solution..thanks
Saturday, July 5, 2014 at 3:55pm

Soil Chemistry
Gasoline producers add oxygenated chemical compounds to reduce the amount of carbon monoxide produced when the fuel is burned. Methyl t-butyl ether (MTBE) is one such oxygenate that is no longer used because of health and environmental concerns. what are the correct exponents ...
Saturday, July 5, 2014 at 3:35pm

Chemistry
Concentrated hydrochloric acid has a purity of 36.0% by mass. The density of the concentrated of the acid is 1.19 g/mL.Determine the molar concentration of this acid..please show me the solution...
Saturday, July 5, 2014 at 3:13pm

Soil Chemistry
Global temperatures are increasing and this increase is probably due to increasing concentrations of greenhouse gases present in A) the troposphere which absorbs outgoing IR radiation B) the stratosphere which absorbs outgoing IR radiation C) the troposphere which absorbs ...
Saturday, July 5, 2014 at 12:20pm

chemistry
Describe how the structure of polyethylene impacts its function in terms of chemical bonding and intermolecular forces
Saturday, July 5, 2014 at 10:58am

Chemistry step by step thank a lot
10L of hard water required 5.6g of line for removing hardness. hence temporary hardness in ppm of cac03. The answer is 1000 Pls solve it for me step by step Thank a lot all tutors for your help.
Saturday, July 5, 2014 at 10:33am

chemistry
give me twenty examples of suspension and colloidal solution
Saturday, July 5, 2014 at 7:13am

chemistry
How many milliliters of NO2 at 25.2 °C and 738 torr are needed to form 16.1 g of HNO3?
Friday, July 4, 2014 at 10:48pm

chemistry Step for step for me thank a lot
A sample of peanut oil weighing 2g is added to 25ml of 0.4M koh. After saponification is complete, 8.5ml of 0.28M hes04 is needed to neutralize excess of koh. The saponification number of peanut oil I do not still understand Pls clearly step by step for me. Thank a lot The ...
Friday, July 4, 2014 at 7:56pm

Chemistry Step by step for me Thank a lot
A sample of peanut oil weighing 2g is added to 25ml of 0.4M koh. After saponification is complete, 8.5ml of 0.28M hes04 is needed to neutralize excess of koh. Saponification number of peanut oil Thank for all tutors for your help. Pls solve it for me step by step for me. The ...
Friday, July 4, 2014 at 7:02pm

chemistry step by step for me Bob
A sample of peanut oil weighing 2g is added to 25ml of 0.4M koh. After saponification is complete, 8.5ml of 0.28M hes04 is needed to neutralize excess of koh. The saponification number of peanut oil. The right answer 146.75 Bob solve it for me step by step
Friday, July 4, 2014 at 6:45pm

Chemistry
How is the atomic structure of a Copper differ from Germanium, Silicon and Gallium Arsenide ? Tnx :))
Friday, July 4, 2014 at 5:27pm

chemistry Ben step by step for me
10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of cac03 The answer 1000 I do not get answer 1000 ppm= 1mg/1L Ben solve it for me step by step for me
Friday, July 4, 2014 at 4:30pm

chemistry please step by step for me
what volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen I know this calculate this part, but I do not get the answer 333.3ml 1.2g/ml x 1000 x 0.365/36.5 = 12M or other ...
Friday, July 4, 2014 at 4:22pm

chemistry
What volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen The answer 333.3ml Who helps me step by step for me
Friday, July 4, 2014 at 3:46pm

Chemistry
What are the two ways in which the physical states of matter can be changed?
Friday, July 4, 2014 at 1:31pm

CHEMISTRY
Which of the following is the conjugate acid to a base in these options : 1) PO4^-3 2) H2O 3) H3PO4 4) H2PO4^-
Friday, July 4, 2014 at 7:30am

CHEMISTRY
Which of the following is the conjugate acid to a base in these options : 1) PO4^-3 2) H2O 3) H3PO4 4) H2PO4^-
Friday, July 4, 2014 at 6:08am

CHEMISTRY
Which of the following pairs are conjugate pairs ? 1) H+ and OH- 2) HCl and Cl- 3) NH2- and NH4+ 4) H2SO4 and SO4^-2 thanks a lot
Friday, July 4, 2014 at 6:05am

CHEMISTRY
A) We have an experiment , using the solution of KNO3 , measured freezing point of solution is -1.15 degree , and using a sample of pure water the thermometer read o.25 degree as freezing point of the sample , calculate the molal concentration of KNO3 assume that the ...
Friday, July 4, 2014 at 3:22am

Chemistry
Calculate the value of the standard enthalpy change for each of the following reactions (standard enthalpy for Na2SO4(s) is -1375.653 kj/mole): a)4HBr(g) + O2(g) = 2H2O(I) + 2Br(I) b)2Na(OH)(s) + SO3(g) = Na2SO4(s) + H2O(g) c)CH4(g) + 4CI2(g) = CCI4(I) + 4HCI(g) d)Fe2O3(s) + ...
Thursday, July 3, 2014 at 11:56pm

Chemistry
Using standard enthalpies information, calculate the standard enthalpy change for this reaction. a)(thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b)Mg(OH)2(s) = MgO(s) + H2O(I) c)N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d)SiCl4(I) + 2H2O(I) = SiO2(s) + 4HCI(g)
Thursday, July 3, 2014 at 11:56pm

Chemistry
Given the Data: N2(g) + O2g) = 2NO(g) delta H = 180.7kj, 2NO(g) + O2(g) = 2NO2(g) delta H = 0113.1kj, 2N2O(g) = 1N2(g) + O2(g) delta H = -163.2kj. Using Hess’s Law calculate delta H for the reaction: N2O(g) + NO2(g) = 3NO(g)
Thursday, July 3, 2014 at 11:54pm

Chemistry
A solution of hydrogen peroxide, H2O2, is titrated with potassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4 + 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L KMnO4 to titrate 50.0 mL of the solution of H2O2. What is the ...
Thursday, July 3, 2014 at 11:51pm

CHEMISTRY
The solubility of a substance is 12 g per 100 g water at 20 degree , and is 18 g per 100 g water at 60 degree , what is the mass of the substance can be crystallized in a saturated solution that contain 200 g of water , if the solution cooled from 60 to 20 degree ?
Thursday, July 3, 2014 at 9:12pm

chemistry
A deep sea diver uses a gas cylinder of 10.0 L and a content of 51.4 g of O2 and 32.5 g of He. Calculate the partial pressure of each gas and the total pressure of the temperature of the gas is 16 C.
Thursday, July 3, 2014 at 7:47pm

Chemistry
When reviewing the procedure the student found that 4.912 x 10-1 M barium nitrate solution had been used instead of that in the following procedure: A student synthesized 6.895 g of barium iodate monohydrate, Ba(IO3)2*H2O by adding 30.00 mL of 5.912 x 10-1 M barium nitrate, Ba...
Thursday, July 3, 2014 at 2:50pm

Chemistry
When reviewing the procedure the student found that 4.912 x 10-1 M barium nitrate solution had been used instead of that in the following procedure: A student synthesized 6.895 g of barium iodate monohydrate, Ba(IO3)2*H2O by adding 30.00 mL of 5.912 x 10-1 M barium nitrate, Ba...
Thursday, July 3, 2014 at 1:39pm

Chemistry
Calculate the value of the standard enthalpy change for each of the following reactions (standard enthalpy for Na2SO4(s) is -1375.653 kj/mole): a) 4HBr(g) + O2(g) = 2H2O(I) + 2Br(I) b) 2Na(OH)(s) + SO3(g) = Na2SO4(s) + H2O(g) c) CH4(g) + 4CI2(g) = CCI4(I) + 4HCI(g) d) Fe2O3(s...
Thursday, July 3, 2014 at 1:32am

Chemistry
Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) (thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b) Mg(OH)2(s) = MgO(s) + H2O(I) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(I) + 2H2O(I) = SiO2(s) + 4HCI(g)
Thursday, July 3, 2014 at 1:27am

Chemistry
Given the Data: N2(g) + O2g) = 2NO(g) delta H = 180.7kj, 2NO(g) + O2(g) = 2NO2(g) delta H = 0113.1kj, 2N2O(g) = 1N2(g) + O2(g) delta H = -163.2kj. Using Hess’s Law calculate delta H for the reaction: N2O(g) + NO2(g) = 3NO(g)
Thursday, July 3, 2014 at 1:16am

Chemistry
A solution of hydrogen peroxide, H2O2, is titrated with potassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4 + 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L KMnO4 to titrate 50.0 mL of the solution of H2O2. What is the ...
Thursday, July 3, 2014 at 12:06am

chemistry
A block of copper of unknown mass has an initial temperature of 66.7 ∘ C . The copper is immersed in a beaker containing 95.5g of water at 20.6 ∘ C . When the two substances reach thermal equilibrium, the final temperature is 26.0 ∘ C .What is the mass of the...
Wednesday, July 2, 2014 at 11:29pm

chemistry
A mixture of He, N2, and Ar has a pressure of 14.2 atm at 28.0 °C. If the partial pressure of He is 1525 torr and that of Ar is 2807 mm Hg, what is the partial pressure of N2?
Wednesday, July 2, 2014 at 11:13pm

Chemistry: Conversion
What's the formula to convert 7 square yards to square meters. May you please show me a website to help with converting or anything? I keep forgetting, and I'm kind of a slow scholar, so please bear with me...
Wednesday, July 2, 2014 at 7:19pm

chemistry
How many grams of glycolic acid are needed to react with 30 mL of 0.1 M NaOH?
Wednesday, July 2, 2014 at 6:00pm

chemistry
A buffer solution contains 0.283 M hypochlorous acid and 0.456 M potassium hypochlorite. If 0.0464 moles of perchloric acid are added to 225 ml of this buffer, what is the pH of the resulting solution ? (Assume that the volume change does not change upon adding perchloric acid...
Wednesday, July 2, 2014 at 3:11pm

chemistry
where can I find compounds that are basic in nature that are inorganic bases and organic bases?
Tuesday, July 1, 2014 at 7:56pm

Chemistry
In a silphuric acid (H2SO4)-Sodium Hydroxide (NaOH) acid-base titration, 17.3mL of 0.126M NaOH is needed to neutralize 25mL of H2SO4 of unknown concentration. What is the morality of the H2SO4 solution? H2SO4 (aq)+ NaOH (aq) = Na2SO4 (aq) + H2O (l)
Tuesday, July 1, 2014 at 6:38pm

Chemistry
The drug is a salt form while a molecular weight of 181.6G/mol. She needs a concentration of the stock solution of 100mM and she needs to make 1.2mL of the drug. How many grams will she need to weight out in order to make the stock solution?
Tuesday, July 1, 2014 at 6:34pm

chemistry
molecular wt of glucose is 180.14g/mole. What is the quanity of glucose in a 500mL IV solution of a 5% dextrose normal saline contain?
Tuesday, July 1, 2014 at 5:59pm

Chemistry 1
In the spectrum of a specific element, there is a line with a wavelength of 486 nm. Use the Rydberg equation to calculate the value of n for the higher energy Bohr orbit involved in the emission of this light. Assume the value for the lower energy orbit equals 2.
Tuesday, July 1, 2014 at 3:50pm

Chemistry 1
A dilute solution of hydrochloric acid with a mass of 614.86 g and containing 0.33004 mol of HCl was exactly neutralized in a calorimeter by the sodium hydroxide in 619.41 g of a comparably dilute solution. The temperature increased from 15.529 to 19.691°C. The specific ...
Tuesday, July 1, 2014 at 3:49pm

Chemistry
24) It was found that a 20.00 mL portion of a solution of oxalic acid, H2C2O4, requires 6.69 mL of 0.200 M K2Cr2O7 for complete reaction in an acidic solution. In the reaction, the oxidation product is CO2 and the reduction product is Cr3+. How many milliliters of 0.450 M NaOH...
Tuesday, July 1, 2014 at 1:29pm

Chemistry
18) Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.534 g of it in water and titrating it with 0.0446 M KOH solution. The titration required 26.73 mL of base. What is the ...
Tuesday, July 1, 2014 at 1:10pm

Chemistry
12) Naturally occurring argon is composed of 0.3365% of 36Ar (atomic mass, 35.9675 u), 0.0632% of 38Ar (atomic mass, 37.9627 u), and 99.6003% of 40Ar (atomic mass, 39.9624 u). Use these data to calculate the average atomic mass of argon.
Tuesday, July 1, 2014 at 1:09pm

Chemistry
13) Mercury is an environmental pollutant because it can be converted by certain bacteria into the very poisonous substance dimethyl mercury, (CH3)2Hg. This compound ends up in the food chain and accumulates in the tissues of aquatic organisms, particularly fish, which renders...
Tuesday, July 1, 2014 at 1:08pm

Chemistry
14) A lawn fertilizer is rated as 7.04% nitrogen, meaning 7.04 g of N in 100 g of fertilizer. The nitrogen is present in the form of urea, (NH2)2CO. How many grams of urea are present in 100 g of the fertilizer to supply the rated amount of nitrogen?
Tuesday, July 1, 2014 at 1:08pm

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