Thursday
September 29, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
How do you write the isotopic symbol for Uranium -238?
Thursday, September 29, 2016 by Omie

Chemistry
The half life of radon 222 is 3.82 days. If the initial mass of a sample of radon 222 is 198.72 grams, how much will remain after 19.25 days?
Thursday, September 29, 2016 by Jess

Chemistry
You want to heat 1 kg of water 10 celsius and you have the following methods under consideration. The heat capacity of water is 4.184 J/K g. (a)You can send the water through a solar collector that has an area of 1 m^2. How long will it take if the sun's intensity on the ...
Thursday, September 29, 2016 by Joesph

Chemistry
A student performing an experiment mistakenly used 8.0 ml of 16 M HNO3 to dissolve 0.16g of solid copper instead of the 4.0 ml as suggested. how many moles of HNO3 remains after the reaction with copper is complete. 8 moles of HNO3 reacts with 3 moles of Cu im not sure how i ...
Thursday, September 29, 2016 by Anonymous

Organic Chemistry
Hi, I'm trying to fix an incorrect IUPAC name of a molecule. It is given as trisecbutylmethane, and I have to draw it out to correct it. Here's the thing: how do I draw incorrect IUPAC name? I can't wrap my mind around it. What I have drawn out is a tertiary carbon...
Thursday, September 29, 2016 by Justin

chemistry
Write the anodic reaction for the electrolysis of zinc chloride solution using platinum electrode
Wednesday, September 28, 2016 by osmon armin

Chemistry
The standard change in internal energy for the combustion of buckyball is -25,968 kJ/mol. What is the enthalpy of combustion? What is the enthalpy of formation of buckyball? What is the molar enthalpy associated with converting buckyball to graphite? How does this compare to ...
Wednesday, September 28, 2016 by Joesph

Chemistry
0.250 g KCN is dissolved in 50 mL of water, and added to 2 mL of NaOH then mixed with 48mL of water. What is the molar concentration of KCN? I am stuck on this question. So far I have: 0.250gKCN/0.050L= 5M(g/L) Moles of KCN: 5M = mol/0.05L = 0.25mol KCN I am not sure exactly ...
Wednesday, September 28, 2016 by Zach

Chemistry
Write a net ionic equation for the overall reaction that occurs when aqueous solutions of potassium hydroxide and oxalic acid (H2C2O4) are combined.
Wednesday, September 28, 2016 by Adriana

Chemistry
How high can a person (assume a weight of 70 kg) climb on one ounce of chocolate if the heat of combustion (628 kJ) can be converted completely into work associated with vertical displacement?
Wednesday, September 28, 2016 by Joesph

chemistry
A compound contains 74,27%C;7,79%H;12,99%N. Determine the empirical formula. C=12;H=1;N=14;0=16.
Wednesday, September 28, 2016 by christina

chemistry
Calculate the percentage composition of sulphuric acid if the atomic masses are H=1u, S=32u and 0=16u
Wednesday, September 28, 2016 by christina

Chemistry
7. A student conducts an experiment on a different hydrate. The empty crucible is heated to a constant mass of 24.330. A sample of the unidentified hydrate is placed in the crucible, and the total mass is 31.571 g. The crucible and hydrate are heated to constant mass, which is...
Wednesday, September 28, 2016 by Alan

chemistry
71.0 mL of a 1.30 M solution is diluted to a total volume of 238 mL. A 119-mL portion of that solution is diluted by adding 105 mL of water. What is the final concentration? Assume the volumes are additive.
Wednesday, September 28, 2016 by mat choma

Chemistry
What type of reaction is listed below? Prove that it is balanced by listing the number of elements on both side of the equation (reactants vs. products)? CH 3 COOH + NaHCO 3  NaCH 3 COO + H 2 CO 3 2. What type of reaction occurred with H 2 CO 3 from the above equation ...
Wednesday, September 28, 2016 by Brandy

Chemistry
If the concentration of KCN at the equivalence point is 0.1M and the Ka for HCN is 6.2*10^-10 find the pH at the equivalence point. The reaction is between KOH and HCN From my understanding I have to do a stoichiometric calculation and then use the Henderson-Hasselback ...
Wednesday, September 28, 2016 by Maddy

Chemistry
A 349mL sample of 1.659 M HI is mixed with 511 mL sample of NaOH (which has a pH of 13.35). What is the pH of the resulting solution?
Tuesday, September 27, 2016 by Kayla M

Chemistry
1)Calculate the number of mL of a 0.095 M NaOH solution required to neutralize 25.0 mL of 0.15 M acetic acid solution 2) Calculate the molarity of a sodium hydroxide solution if 22.0 mL of the sodium hydroxide is required to neutralize 0.50 g of KHP. NaOH(aq)+ KHC8H4O4 -> ...
Tuesday, September 27, 2016 by Casey

Chemistry
1)Calculate the number of mL of a 0.095 M NaOH solution required to neutralize 25.0 mL of 0.15 M acetic acid solution 2) Calculate the molarity of a sodium hydroxide solution if 22.0 mL of the sodium hydroxide is required to neutralize 0.50 g of KHP. NaOH(aq)+ KHC8H4O4 -> ...
Tuesday, September 27, 2016 by Casey

Chemistry
Rank the following atoms in order of decreasing electronegativity, putting the most electronegative first: F, Ne, O, N, C
Tuesday, September 27, 2016 by Nevaeh

Chemistry
A 19.3L expandible container is filled in a room where the pressure is 761mmHg. It is filled with 600.4mmHg nitrogen, 108mmHg oxygen, 32.1 mmHg water vapor. The rest of the pressure is made up by carbon dioxide. The temperature is 20.3°C a. What is the partial pressure of ...
Tuesday, September 27, 2016 by Anonymous

AP Chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/g · ◦C and 2.03 J/g·◦C, respectively, calculate the total quantity of heat necessary to melt 19.2 g of ice at −50.0◦C and heat it to steam at 200◦C. The molar heats ...
Tuesday, September 27, 2016 by Rachel M

Chemistry
Write the net ionic equation for the equilibrium that is established when ammonium nitrate is dissolved in water. (Use H3O+ instead of H+)
Tuesday, September 27, 2016 by Jen

Chemistry
The concentration of ammonium ion in the solution of the salt called ferrous ammonium sulfate, formula [Fe(NH4)]2(SO4)3, is 0.360 M. The concentration of sulfate ions in this solution is?
Tuesday, September 27, 2016 by Colby

Chemistry
A 349mL sample of 1.659 M HI is mixed with 511 mL sample of NaOH (which has a pH of 13.35). What is the pH of the resulting solution?
Tuesday, September 27, 2016 by Kayla M

AP Chemistry
DrBob222 PLEASE HELP Hf of CO2 = -393.5 kJ/mol Hf of H2O = -285.8 kJ/mol The combustion reaction for benzoic acid C6H5CO2H(s) + 15/2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hess’s Law to calculate ∆H0f for benzoic acid. 1...
Tuesday, September 27, 2016 by Rachel M

Chemistry
A 635 mL solution of HBr is titrated with 0.51 M KOH. If it takes 1569 mL of the base solution to reach the equivalence point, what is the pH when only 141 mL of the base has been added to the solution?
Tuesday, September 27, 2016 by Taylor J

AP Chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/g ·◦C and 2.03 J/g·◦C,respectively, calculate the total quantity of heat necessary to melt 19.2 g of ice at −50.0 ◦C and heat it to steam at 200◦C. The molar heats ...
Tuesday, September 27, 2016 by Rachel M

chemistry
write down the chemical formular for the following compounds 1.Sodium flouride 2.Berillium chloride 3.Pottasium iodide 4.Rubidium bromide 5.Magnesium sulphide
Tuesday, September 27, 2016 by Dora

chemistry
if copper (II) sulfate pentahydrate is known to be 36% of water how many grams of water will be lost when heating a 5.75 grams sample?
Tuesday, September 27, 2016 by velia

Chemistry
You took 7.15 mL of the 2.20 M solution and diluted it. It's absorbance is 0.605. What is the concentration of the new solution? I have no idea where to even start.
Tuesday, September 27, 2016 by Ciara

Chemistry
Calculate volume of ammonia gas produced at STP when 140g of nitrogen gas is reacted with 30g of hydrogen gas.
Tuesday, September 27, 2016 by Nasreena

Maths
In a class of 60students,the number of student passed Biology is 6 more than the number of student passed Chemistry,8 student passed both subject.How many student passed Biology,how many student passed Chemistry,how many student passed only one subject?
Tuesday, September 27, 2016 by Asare

chemistry
The solubility of barium nitrate at 100°C is 34 g/100 g of H2O and at 0°C is 5.0 g/100g of H2O. If you start with 100 g of Ba(NO3)2 and make a saturated solution in water at 100°C, how much water is required? If the saturated solution is cooled to 0°C, how much...
Tuesday, September 27, 2016 by pragati

Chemistry
A 635 mL solution of HBr is titrated with 0.51 M KOH. If it takes 1569 mL of the base solution to reach the equivalence point, what is the pH when only 141 mL of the base has been added to the solution?
Tuesday, September 27, 2016 by Taylor

Chemistry
How many different oligosaccharides can be made by linking one glucose and one galactose if the anomeric carbon of glucose is involved in the glycosidic bond? Assume that each sugar is in its pyranose form. A. 5 B. 4 C. 2 D. 1 E. 3 Would it be 4?
Monday, September 26, 2016 by Anonymous

Chemistry
The bond between a glycoprotein and a carbohydrate is made to which atom of a monosaccharide? A. C-3 B. C-6 C. varies with different glycoproteins D. anomeric carbon E. C-4 Would the answer be (E) C-4?
Monday, September 26, 2016 by Anonymous

Chemistry
A 19.3L expandible container is filled in a room where the pressure is 761mmHg. It is filled with 600.4mmHg nitrogen, 108mmHg oxygen, 32.1 mmHg water vapor. The rest of the pressure is made up by carbon dioxide. The temperature is 20.3°C a. What is the partial pressure of ...
Monday, September 26, 2016 by Anonymous

chemistry
A sample of neon gas is held in a rigid 2.284L container with a pressure of 1.036 atm at 24.3°C. 4.093g of an unknown cold gas is added to the container. The temperature drops to 20.3°C, but the pressure rises to 1.960atm. What is the molar mass of the added gas?
Monday, September 26, 2016 by Anonymous

Organic Chemistry
Compound A has solubility at 20 degrees celsius of .029 g / 10.0 mL. How much of compound A will remain in solution after cooling to 20 degrees C?
Monday, September 26, 2016 by Lauren

Chemistry
Dr. Bob222 I still didn't understand which is the reduction half reaction and its products and oxidation half reaction...and why is it O3 to IO3-...0 to -6 and then Please help...entrance exam soon Write the oxidation and reduction half reactions(showing e- lost or gained...
Monday, September 26, 2016 by Maria

Chemistry
Water drips from a faucet into a flask at the rate of two drops every 5 seconds. A milliter of water is 20 drops. What volume of water, in liters, will be collected in 2.5 hours.
Monday, September 26, 2016 by Tyler

chemistry
Calculate energy change taht produced the 4th line in lyman series
Monday, September 26, 2016 by maria

chemistry
how many grams of barium would be found in 1.72g of barium sulfate 1.72(137.3/233.4)
Sunday, September 25, 2016 by lola

Chemistry
The density of a sample of F2(g) is 1.559 g/L. If the gas is held at 755 torr, calculate the temperature. how would i calculate the volume to use
Sunday, September 25, 2016 by Anonymous

Chemistry
Wat is the product of Mn^+2 + NH3? is it Mn(NH3)2?
Sunday, September 25, 2016 by Eb

Chemistry
4.12 grams of Zinc are placed in a crucible with 3.00 grams (excess) of Sulfur. when reaction is complete the product mass is 6.10 grams. What mass of Sulfur should be used in the simplest formula calculation? Find the empirical formula of Zinc Sulfide. My work... 6.10 g ...
Sunday, September 25, 2016 by Jakob

Chemistry
Cynthia combines 1.7 grams of Silver hydroxide with 234 ml of a 1.2 M solution of HBr. Assume all the silver hydroxide dissolves once it is in solution(which is technically not the case, but for this example, just go with the flow of it). What will be the final pH of the ...
Sunday, September 25, 2016 by Kane

Ap Chemistry
Saccharin has a pKa of 2.32 It has a formula of HNC7H4SO3 If you dissolve 4.6 grams of saccharin in 478 ml of water, what is the resulting pH ?
Sunday, September 25, 2016 by John

Chemistry
What is the volume of the oxygen produced when 1.00L carbon dioxide reacts with 20.0 g of Na2O2 based on the following unbalanced reaction at 25C and 2.00 bar? Na2O2 + CO2 -> O2 + Na2CO3 R = 0.083145 L bar K-1 mol-1 I got 1.57L but the answer is 500mL
Sunday, September 25, 2016 by Mary

Basic Chemistry
A 150L water heater is set to a cutoff temperature of 49 degrees C and that the incoming water is at 298K, calculate the energy in kJ needed to get this 150L water to it's maximum temperature. Please help!
Sunday, September 25, 2016 by Hannah

Chemistry
Is the flame coloration a test for the metal or for the acid radical?
Sunday, September 25, 2016 by Judy

Chemistry
if I want to show the results of a nitrate analysis as nitrogen what is the equation
Sunday, September 25, 2016 by Anonymous

chemistry
How many GRAMS of carbon dioxide can be produced from 3.70 grams of oxygen ?
Saturday, September 24, 2016 by lola

Chemistry
Similar question to http://www.jiskha.com/display.cgi?id=147​4753951 "If that 22.33g sample of calcium chloride was dissolved in 1000.0g of water, with both substances originally at 25.0C, what would be the final temperature of the solution be? Assume no loss of ...
Saturday, September 24, 2016 by Steve

Chemistry
Please help...entrance exam soon Write the oxidation and reduction half reactions(showing e- lost or gained) for the foll O3 + I- -> IO3- + O2 (acidic)
Saturday, September 24, 2016 by Maria

Organic Chemistry
What would happen to the melting point of a solid if it is mixed with granular particles of glass? Explain.
Saturday, September 24, 2016 by Anonymous

Chemistry
Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give all answers to three sig figs. a. ...
Saturday, September 24, 2016 by Amy

Chemistry
CaCl2(s) -> Ca(aq) + 2Cl(aq) ΔH_rxn = +198.0 KJ "If that g sample of calcium chloride was dissolved in 1000.0g of water, with both substances originally at 25.0C, what would be the final temperature of the solution be? Assume no loss of heat to the surroundings ...
Saturday, September 24, 2016 by Maddison

Chemistry
Five year old Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give all answers to three...
Saturday, September 24, 2016 by Laura

Chemistry
The pressure in pressure cooker is 1.90 what will be the temperature
Saturday, September 24, 2016 by Humza Alvi

Chemistry
Aqueous solutions of copper (II) sulfate, CuSO4, and potassium carbonate, K2CO3, a blue parcipitate of copper (II) carbonate forms in addition to one other compound. We have to write the balanced chemical equation for that but our teacher didnt teach us anything about that
Saturday, September 24, 2016 by Sarah

CHEMISTRY HELP
Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???
Saturday, September 24, 2016 by Christine

Chemistry (Help!)
Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???
Saturday, September 24, 2016 by Christine

chemistry
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 252 torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction of hexane? (Assume ideal...
Saturday, September 24, 2016 by liz

chemistry
If 10.0 L of butane and oxygen are combined at the same temperature and pressure, which gas will be left over after reaction? Include your calculation/reasoning.
Saturday, September 24, 2016 by Darren

Chemistry
to determine the concentration of ascorbic acid in fruit juice using DCPIP
Saturday, September 24, 2016 by Zanele

chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.07 % naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr.
Saturday, September 24, 2016 by elizabeth

chemistry
Paper pulp is sold on the basis that it contains 12% moisture; if the moisture exceeds this value, the purchaser can deduct any charges for the excess moisture and also deduct for the freight costs of the excess moisture. A shipment of pulp became wet and was received with a ...
Saturday, September 24, 2016 by jana

Chemistry
An element has three stable isotopes. One has a mass number of 63 and an abundance of 50%. The second has a mass number of 65 and an abundance of 30%. The third has a mass number of 67 and an abundance of 20%. Calculate the relative atomic mass of this element. I am so ...
Saturday, September 24, 2016 by Robert

chemistry
A sample of CaCl2⋅2H2O/K2C2O4⋅H2O solid salt mixture is dissolved in ~150 mL de-ionized H2O. The oven dried precipitate has a mass of 0.253 g. The limiting reactant in the salt mixture is K2C2O4⋅H2O. Determine Mass of K2C2O4⋅H2O(aq) in Salt Mixture in ...
Friday, September 23, 2016 by maricela

chemistry
In a large building, oil is used in a steam boiler heating system. The combustion of 1.0 lb of oil provides 2.2×107J. Part A How many kilograms of oil are needed to heat 110 kg of water from 24 ∘C to 100∘C? (Assume that 1lb=454g, the specific heat of liquid ...
Friday, September 23, 2016 by john

Chemistry
Given a 800 mg sample of Thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg? 231 0 231 Th -> Beta + Pa 90 -1 91 800 mg/ 25 mg
Friday, September 23, 2016 by Lauren

Chemistry
The efficacy of certain drugs is affected by pH. Many drugs are absorbed into the blood through cells lining the stomach or the small intestine by direct diffusion across the plasma membrane. Since the interior of the plasma membrane is hydrophobic, uncharged molecules cross ...
Friday, September 23, 2016 by Aria

chemistry
Bicine is an amino acid, but not a building block of proteins. Rather, it is a reagent commonly used in the biochemistry laboratory. Bicine contains two ionizable groups: tertiary amine (pKa 8.3) and carboxyl (pKa 2.3) a. For each of the ionizable groups in bicine, draw its HA...
Friday, September 23, 2016 by Aria

chemistry
You discovered a new diprotic acid, which you have named edmontonic acid. You want to characterize the pKa’s of edmontonic acid, so you perform a titration experiment. Your data are summarized in the table below. Your titration sample contains 150 mmol of edmontonic acid...
Friday, September 23, 2016 by Aria

chemistry
In a titration of malic acid, what is the pH after: a. 0.75 molar equivalents of NaOH have been added? 1 b. 1.30 molar equivalents of NaOH have been added?
Friday, September 23, 2016 by Aria

Organic Chemistry
One sample that is 1mm in height has a melting point range of 200-201. What would be the melting point range of a 10mm sample in height if both samples heating rate is 2 degrees Celsius per minute? I'm thinking it would be about 2000-2010 but I'm not fully sure. I used...
Friday, September 23, 2016 by Karnvir

Chemistry
How many grams of ammonia are needs to produce 0.5kg of NH42So4
Friday, September 23, 2016 by Zeeshan

chemistry
is this statement true? More heat is needed for vaporization of a liquid compared with melting a solid of the same substance.
Friday, September 23, 2016 by laura

chemistry
If you transfer 5 J of energy to 1 g water and to 1 g ethanol, each starting at the same temperature which would have a higher temperature at the end? Water or ethanol? or will they have the same temperature at the end?
Friday, September 23, 2016 by laura

Chemistry
18cubic centimeters of 0.8Mlithium hydroxide is neutralized by 24cubic centimeters of 0.3Msulphuric acid.What is the formular of the salt formed?
Friday, September 23, 2016 by Doris

Chemistry
20cubic centimeters of 0.27M sodium hydroxide solution is added to 18.2cubic centimeters of 0.75M hydrochloric acid.To the solution is then added excess magnesium.What volume of hydrogen gas measured at s.t.p evolved?
Friday, September 23, 2016 by Doris

Chemistry
84cubic centimeters of hydrogen chloride gas measured at s.t.p is dissolved in water and titrated with 0.15M sodium hydroxide.What volume of sodium hydroxide solution is required for complete neutralization?
Friday, September 23, 2016 by Doris

Chemistry
how many cubic cm hydrogen chloride gas at s.t.p would be required to precipitate all the silver ions from 32 cm of 0.08 M silver nitric solution?
Friday, September 23, 2016 by Doris

Chemistry
What volume of ammonia gas at s.t.p is required to neutralise 40 cm of 2 M sulpheric acid?
Friday, September 23, 2016 by Doris

Chemistry
8.4 g of a mixture of potassium hydroxide and potassium chloride were made up of 1 litre of aqueous solution. 20 cm of this solution required 24.2 cm of 0.1 m nitric acid for neutralisation. calculate the percentage by mass of potassium chloride in the mixture
Friday, September 23, 2016 by Doris

Chemistry
If 100.0 mL of 0.171 M Na2SO4 are added to 100.0 mL of 0.889 M Pb(NO3)2, how many grams of PbSO4 can be produced? Equation: Na2SO4 + Pb(NO3)2 = 2NaNO3 + PbSO4
Thursday, September 22, 2016 by Zach

Chemistry
(DrBob222 please help me) What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128 J/g◦C. Please explain with the numbers plugged in ...
Thursday, September 22, 2016 by Rachel M

Chemistry
PLEASE HELP OR I WILL FAIL What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128J/g◦C.
Thursday, September 22, 2016 by Rachel

Chemistry G.12
Check if im right please: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) At a specific time in the reaction, ammonia is disappearing at rate of 0.068 mol/(L • s). What is the corresponding rate of production of water? I did Rate of Production H20 = 1/6(0.068) = 0.0113 mol/(L*s...
Thursday, September 22, 2016 by Sherry

Physical Science/ Chemistry
Which of the following shows the correct order of Family #1 elements from least to most reactive? A) Li, Na, Rb, K B) Li, Na, K, Rb C) Rb, K, Na, Li D) Li, Na, K, Ba
Thursday, September 22, 2016 by Kayla

AP Chemistry
(DrBob222 please help me) A sample of 1.97 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.015◦C to 25.484◦C. What is ∆Hsolution for substance Z? Assume no heat is ...
Thursday, September 22, 2016 by Rachel

Chemistry
Hey, can someone help me with this? A compound containing only C, H and O was subjected to combustion analysis. A sample of 6.120×10^-2 g produced 1.601×10^-1 g of CO2 and 5.243×10^-2 g of H2O. Determine the empirical formula of the ...
Thursday, September 22, 2016 by James

Chemistry
Trying to wrap my head around this, thanks for the help: You have 8.63 moles of C2H6O2 in the following unbalanced equation: (I already balanced it, here is the balanced): C2H6O2 + 5 O2 → 4 CO2 + 6 H2O How many moles of water are produced in this reaction?
Thursday, September 22, 2016 by BHT

chemistry
Is the following sentence true or false? The value of an error must be positive.
Thursday, September 22, 2016 by Anonymous

analytical chemistry
Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.
Thursday, September 22, 2016 by Angel

Chemistry
For a reaction N2+O2=2NO If Kc=10-30 at 25°C One Can predict with solid reason? (1) More NO is formed (2) The forward reaction goes to completion (3) The backward reaction goes to completion (4) More reactant can consumed
Thursday, September 22, 2016 by Ujala

Chemistry
For a reaction N2+O2=2NO If Kc=10-30 at 25°C One Can predict (1) More NO is formed (2) The forward reaction goes to completion (3) The backward reaction goes to completion (4) More reactant can consumed
Thursday, September 22, 2016 by Ujala

Chemistry
So I have to find the % by mass of an unknown metal that reacted with HCl to create MCl2 (with the M being unknown). Then I need to determine identity of the missing metal. I know that the final mass of the compound MCl2 is 12.47g and that the original mass of the metal M ...
Wednesday, September 21, 2016 by Krys

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