Friday
December 9, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
The pressure of the earth's atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg) 2.62×102 kg/m2 5.02×104 kg/m2 4.30×10-3 kg/m2 2.09×10-2 g/m2 1.03×104 kg/m2
Sunday, May 15, 2016 by Ha

Science (chemistry)
If 1mile of methane(CH4) is releases 890 kJ/mole, how much energy is released per gram of methane?
Sunday, May 15, 2016 by Ambrosia

Chemistry
A solid at room temperature that can conduct electricity
Sunday, May 15, 2016 by Anonymous

college chemistry
If the temperature of argon gas is 400 K and the average velocity of argon is twice that of radon what is the temperature of radon gas?
Sunday, May 15, 2016 by ian

Chemistry
Calculate the heat required to convert 5gm of ice at 0oc into 5gm of steam at 100oc.
Sunday, May 15, 2016 by Siddharth

chemistry
a mixture of O2 and gas "Y" (mol wt. 80) in the mole ratio a:b has a mean molecular weight 40.. what would be mean molecular weight,if the gases are mixed in the ratio b:a under identical conditions? (gases are non reacting)
Sunday, May 15, 2016 by kasturi

chemistry
assuming the volume of h2so4 needed to completely neutralize naoh of concentration 0.2m is 23.50ml take the volume of base to be 2ml question write a balance equation for the neutralization calculate the concentration of the acid what indicator can be used for the analysis and...
Sunday, May 15, 2016 by chiemelie

chemistry
The local weather forecaster reports that the current barometric pressure is 29.5 inches of mercury. What is the current pressure in atmospheres? 9.99 atm 3.93 atm 0.986 atm 883 atm 1.00 atm
Sunday, May 15, 2016 by Ha

Chemistry
If the temperature of argon gas is 400 K and the average velocity of argon is twice that of radon what is the temperature of radon gas?
Saturday, May 14, 2016 by Cornelius

chemistry
For 109percent labelled oleum if the no. of moles of H2SO4 and free S03 be x and y resp. then whay will be the approx value of x+y/x-y (here / means division)
Saturday, May 14, 2016 by Rishav raj

Chemistry
If 845mL of a 2.5x10^-5 mol/L solution of Ni(NO3)2 was mixed with 195mL of a 4.86x10^-2 mol/L solution of KOH, would precipitate form? Calculate the ion product for the potential precipitate. The Ksp of Ni(OH)2(s) is 6.0x10^-16
Saturday, May 14, 2016 by Brianne

Chemistry
What is the gram solubility of Mg(OH)2 in a 0.55mol/L solution of KOH if the Ksp of Mg(OH)2 is 9.0x10^-12?
Saturday, May 14, 2016 by Brianne

Chemistry
Consider the following system at equilibrium. CaCO3(s) mc032-1.jpg Ca2+(aq) + CO32–(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect? CCl4 CO2 CuSO4 Na2CO3
Saturday, May 14, 2016 by Haylie S

Chemistry
Consider the reaction below. 2C6H14 + 19O2 mc032-1.jpg 12CO2 + 14H2O How many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide? 1.53 mol 3.07 mol 110. mol 175. mol
Saturday, May 14, 2016 by Haylie S

Chemistry
Which represents the ionization of a strong electrolyte? CH3OH(l) mc015-1.jpg CH3OH(aq) K3PO4(s) mc015-2.jpg 3K+(aq) + PO43–(aq) H2CO3(aq) mc015-3.jpg H+(aq) + HCO3–(aq) CH3COOH(aq) + H2O(l) mc015-4.jpg H3O+(aq) + CH3COO–(aq)
Saturday, May 14, 2016 by Haylie S

chemistry
2NO + O2 = 2NO2 How many grams of NO2 will be produced when 5.00 moles of NO react?
Saturday, May 14, 2016 by chrissy

chemistry
Cobalt Chloride forms pink crystals.When they are heated,water is evolved and they turn blue. .Explain how we could use Cobalt Chloride as a test for water??
Saturday, May 14, 2016 by qurat-ul-ain

Chemistry
With the combustion of methane, CH4, If 150 Liters of carbon dioxide are produced, how many grams of methane required?
Friday, May 13, 2016 by Dena

Chemistry
The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following: • Label the cathode and the anode, including the charge on each. • Show the flow of electrons. • Describe what type of ...
Friday, May 13, 2016 by kat

Chemistry
3. The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following: • Label the cathode and the anode, including the charge on each. • Show the flow of electrons. • Describe what type of ...
Friday, May 13, 2016 by kat

chemistry
You have 95.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 2.50 M solution of AgNO3(aq). Calculate the concentration of Na+ after the two solutions are mixed together. 1.08 M 0.475 M 5.00 M 0.00 M 2.16 M
Friday, May 13, 2016 by Ha

Chemistry
If The Rate of Diffusion Of Oxygen Is Taken As The Rate Of 1. What Will Be The Rate Of Diffusion Of Methane Whose Relative Molecular Mass Is 16
Friday, May 13, 2016 by Rashidat

chemistry
If 987g of oxygen gas reacts completely with hydrogen gas, what volume of water vapor will be produced (in L) at 0.954 atm and 465 degree=es celcius?
Thursday, May 12, 2016 by Kierstin

Chemistry
Concentrated nitric acid is 70% HNO3 and 14.7 M. What is the density of the solution?
Thursday, May 12, 2016 by Julia

Chemistry
A solution of concentrated NaOH is 16.4 M. If the density of the solution is 1.43 g/mL what is the percent by mass NaOH?
Thursday, May 12, 2016 by Olivia

Chemistry
A solution is 25% by mass calcium nitrate and has a density of 1.21 g/mL what is the molarity?
Thursday, May 12, 2016 by Adrian

Chemistry
A current of 2 Amperes is past for 30minutes. Calculate the mass of sodium and the mass of copper deposited.
Thursday, May 12, 2016 by Anna

Chemistry
45.1 grams of Sodium Chloride is combined with 72.3 grams of barium phosphate. Balance the following equation NaCl + Ba3(PO4)2 --> Na3PO4 + BaCl2 How many grams of Barium dichloride will be produced?
Thursday, May 12, 2016 by Adam / DrBob222

chemistry
1. A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?
Thursday, May 12, 2016 by Montie Stengel

Chemistry
would it be possible to dissolve 50g of sodium chloride in 100g of water? explain.
Thursday, May 12, 2016 by Kinge

Chemistry
Insoluble silver carbonate, Ag2CO3(s), forms in the following balanced chemical reaction: 2AgNO3(aq) + K2CO3(aq) = Ag2CO3(s) + 2KNO3(aq). What mass of silver nitrate, 2AgNO3(aq), reacts with 25.0 g of potassium carbonate,K2CO3(aq),if there is at least 5.5 g of silver nitrate ...
Thursday, May 12, 2016 by Gale

chemistry
The H3O+ ion concentration in water is 1/10000000 molar.The degree of ionisation of H2O is? If given molarity of pure water is 55.5Molar.
Thursday, May 12, 2016 by monika

science-chemistry
The extent of ionisation in a 0.75M solution of a monoprotic acid is 0.040. calculate Ka
Thursday, May 12, 2016 by shelagh

Chemistry
how many atoms of S are in 9.2 moles of Na(SO4)2?
Thursday, May 12, 2016 by Emergent help please!!

Chemistry
A 100g sample of water absorbs 308kJ of heat. If the water was initially at -10 degrees Celsius, what is its final temperature?
Thursday, May 12, 2016 by Homework Help:

Chemistry
Activation energy is____ the heat released in a reaction*** the energy barrier between reactants and products the energy given off when reactants collide generally very high for a reaction that takes place rapidly
Thursday, May 12, 2016 by Annamarie

chemistry
white powder of calcium oxide is added to beaker containing water?
Thursday, May 12, 2016 by kiranmai

chemistry
A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?
Thursday, May 12, 2016 by chrissy

Chemistry
Given the following information: C(s) à C(g), H = +715 kJmol-1 Cl2(g) à 2Cl(g), H = +242 kJmol-1 C(s) + 2Cl2(g) à CCl4(g), H = -135.5 kJmol-1 Calculate the average bond dissociation enthalpy of a C-Cl bond.
Thursday, May 12, 2016 by C

chemistry
the solubility of Mg(OH)2 at 25C is4.6x10^-3 g/100cm3? what is the solubility product of M g(OH)2?
Thursday, May 12, 2016 by ali

Chemistry
A naturally occuring sample of copper consists of 69.2% of Cu63 and 30.8% of Cu65.The relative atomic mass of Cu63 is 62.93 and that of Cu65 is 64.93.Find the atomic mass of a naturally occuring sample of copper.
Thursday, May 12, 2016 by Bhagavatula yogiraj

chemistry
Calculate the temperature in kelvin of a 2.5 mol sample at 8.3 atm in 45 L. Give your answer to 2 sig figs. Which equation do I use to calculate temperature?
Thursday, May 12, 2016 by Kierstin

Chemistry (Stoich)
13.In a study of rust-removing solutions, 27.8 mL of 0.115 mol/L phosphoric acid reacts completely with 0.245 mol/L sodium hydroxide. Predict the minimum volume of sodium hydroxide required for this reaction? 3 NaOH + H3Po4 = 3H20 + Na3PO4 (27.8 ml)(0.115) = 0.003197 mol H3Po4...
Thursday, May 12, 2016 by Studying

Chemistry
Calculate the pH of a buffered solution prepared from 0.25 mol KF and 0.75 HF after the addition of 0.05 mol of NaOH (assume a 1.0 L volume of solution) I get that i need to use two seperate ice tables, but i don't really understand how to go about doing that?
Thursday, May 12, 2016 by Megan

Chemistry
How do can you find the difference between these acids/bases with only one indicator? We have 0.1M NaOH, H2SO4, HCl, AlCl3, and Na2CO3. We know the pH of all the solutions (AlCl3 = 2.9, H2SO4 = 0.7, HCl = 1, Na2CO3 = 11.8, NaOH = 13). We only can use 1 indicator to determine ...
Wednesday, May 11, 2016 by Jaime

Chemistry
What is the molarity of 10g of H2SO4 in 100ml of water?
Wednesday, May 11, 2016 by Deysi

Chemistry
If 27 grams of propane react with 88 grams of oxygen to make carbon dioxide and water then how many grams of carbon dioxide can be made?
Wednesday, May 11, 2016 by Jessica

Chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in one strand of DNA is approximately 3.0 x 10^6, and the average molar mass of a nucleotide is 327 g/mole, what is the average molar mass of an entire DNA double...
Wednesday, May 11, 2016 by Merp

chemistry
What mass of water is produced when 0.1 moles of C2H6 is reacted with 0.1 moles of O2?
Wednesday, May 11, 2016 by PLEASE HELP ME

chemistry
The vapour pressure of pure water at 760 mm at 25 degree celcius. The vapour of solution containing 1m solution of glucose will be.
Wednesday, May 11, 2016 by munaf

Chemistry
5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established, 11.28 moles of nitric oxide are formed calculate the value of equilibrium constant
Wednesday, May 11, 2016 by Anon

Chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...
Wednesday, May 11, 2016 by KS

Chemistry
if 40.0 ml of 11.25 M KNO3 is used to make a 7.55 L aqueous solution, what is the molarity of the solution
Wednesday, May 11, 2016 by Reilly

chemistry
what will haprn if ammonium chloride solution is used to standardize potassium tetraoxamaganate VII solution instead of ammonium iron II sulphate
Wednesday, May 11, 2016 by samuel

Chemistry
2ZnS + 3O2 -> 2ZnO + 2SO2 If 1000kg of ZnS is oxidised, what amount (in moles) and volume (in litres) of SO2 is produced (assuming that gas is at STP)
Wednesday, May 11, 2016 by Casey

Chemistry - Order of Bond Polarity
Hi I am having a bit of trouble with this question CCl4 is confusing me: Qu)Rank the following compounds in order of bond polarity; HF, CH4, H2O, H2S, CCl4 Asw)lowest to highest bond polarity: CH4, CCl4, H2S, H2O, HF Is this correct? Thanks!
Wednesday, May 11, 2016 by Anonymous

chemistry
need help drawing an electrochemical cell that could be used to plate zinc onto other metals.labeling cathode and anode, and reactions that occur.
Wednesday, May 11, 2016 by anonymous

Chemistry
How many grams of perchloric acid are dissolved into 3.86 L of water, if the pH of the solution is 4.03.
Wednesday, May 11, 2016 by Jose

Chemistry
what is the osmotic pressure produced by a 1.20M glucose (C6H12O6) solution at 25 degree celsuis?
Wednesday, May 11, 2016 by Elsie

Chemistry
what is the osmotic pressure produced by a 1.20M glucose (CH12O6) solution at 25 degree
Wednesday, May 11, 2016 by Elsie

Chemistry
When chromium has 26 electrons, how many neutrons and protons does it have and what is it's standard notation
Tuesday, May 10, 2016 by Chris

Chemistry
How many grams of sodium sulfate na2so4 must be added to make 500ml of a 12.5 M sodium sulfate solution
Tuesday, May 10, 2016 by Jessie

Chemistry
I'm sorry here is another I do not understand. How do you find out exactly how much of a solution you would need to completely precipitate another compound in the reaction? We can precipitate out solid lead(II) iodide from an aqueous lead(II) nitrate solution by adding ...
Tuesday, May 10, 2016 by Kierstin

Chemistry
20. What is the molecular formula for alkane, alkenes and alkynes? 15.What happens to a reaction at equilibrium when more reactant is added to the system?
Tuesday, May 10, 2016 by BLAH

Chemistry
We can precipitate out solid lead(II) iodide from an aqueous lead(II) nitrate solution by adding potassium iodide. If we have 500. mL of 0.632 M lead(II) nitrate solution and add excess potassium iodide, how much solid lead(II) iodide will form (in grams)? 2 KI(aq) + Pb(NO3)2(...
Tuesday, May 10, 2016 by Kierstin

chemistry
The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (...
Tuesday, May 10, 2016 by jenna

chemistry
If the average volume of all the blood in a human body is 4700 mL, what is the molarity of DNA in the human blood system?
Tuesday, May 10, 2016 by jenna

chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...
Tuesday, May 10, 2016 by jenna

Chemistry
would someone be willing to help me fill out my study guide
Tuesday, May 10, 2016 by BLAH

Chemistry
When I push on my refrigerator, there is a force acting on it that wasn't there before. That means it should be experiencing an unbalanced force and begin to move. Why doesn't it?
Tuesday, May 10, 2016 by Jaz

Chemistry
A buffer system contains 0.30 M NH4+ and 0.15 M NH3. pKa of NH4+ is 9.25. How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25? Hint: What is the (NH3) / (NH4+) when the pH=pKa?
Tuesday, May 10, 2016 by Ally

chemistry
when zinc graurles are dipped in copper sulphate solution write balance equation?
Tuesday, May 10, 2016 by swati

chemistry
Henry's law constant for N2 and O2 is 1.6 *10^-6and 8.77*10^-7 molal/mm Hg at 298k.Air has 78 mole percentage N2 and 21 mole percentage O2.at atmospheric pressure the ratio of solubility of N2 and O2 in water is?
Tuesday, May 10, 2016 by Rahul

Chemistry
The nitric acid was purchased as a solution that has 70% HNO3. That volume (mL) of this solution is necessary for preparing 250 mL Solution 2.0 mol L-1? The density of HNO3 (aq) 70% is 1.42 g cm-3
Tuesday, May 10, 2016 by Adam

chemistry 12u
how do i calculate this.. a solution of nitrous acid has a pH of 2.73 what is the [H3O+] ?
Tuesday, May 10, 2016 by julie

chemistry
Cu2+ + 2e- -> Cu Oxidation reaction Cu -> Cu2+ + 2e Reduction Reaction Do I have these right, or are they backwards?
Monday, May 9, 2016 by kat

Chemistry
How many grams of sucrose will be necessary to prepare 300 ml of a 5% solution of sucrose (342.0 g/mol)
Monday, May 9, 2016 by Adam

Chemistry
how many grams of AlCl3 is produced if 15.5 grams of Al are reacted with excess Cl2 gas? 2Al + 3Cl2 > 2AlCl3
Monday, May 9, 2016 by Emily

Chemistry
You want to neutralize 6 mol of sulfuric acid with 6.0 M sodium hydroxide. How much 6.0 M sodium hydroxide must you add to react exactly with the sulfuric acid? 2NaOH(aq)+H2SO4(aq)-->2H2O(l)+Na2SO4(​aq) 2 moles sodium hydroxide for every 1 mol sulfuric acid. which ...
Monday, May 9, 2016 by Kierstin

chemistry
The basicity of tetraoxosulphate(6) is 2. explain this statement with an equation showing the reaction between the acid and potassium hydroxide
Monday, May 9, 2016 by Ayibadenyifa

Chemistry
The reaction of methyl-benzene with HNO3 in the presence of catalyst will provide what main compound?
Monday, May 9, 2016 by David

chemistry
how many unpaired electrons are in this complex? Ni(en)2(CN)2 where en is the neutral ethylenediamine and CN is cyanide as the counter ion, I want to say there are no unpaired e- but I'd like a check
Monday, May 9, 2016 by Anonymous

Chemistry
What are the molecular formula for: 3-methylpentanoic acid Cis-2-propyl-2-hexane N-methylpropanamine N-methylhexan-3-amine
Sunday, May 8, 2016 by Rose

chemistry
The measured density oe He at NTP is 0.1784g/l.what is the weight of one mole?
Sunday, May 8, 2016 by dev

chemistry
You have a solution of 12.0 M HCl. You need 36.5 g of hydrochloric acid for a reaction in your chemistry lab. How many mL of solution must you use?
Sunday, May 8, 2016 by Nur

Chemistry
Caso4+naoh
Sunday, May 8, 2016 by Raju

Chemistry
Sulfamethoxazole has the molecular formula C10H11N3O3S. 10.0 g of tablets containing sulfamethoxazole and trimethoprim were crushed and dissolved in water. A strong oxidising agent was added, which converted all the sulfur in the sulfamethoxazole into sulfate ions. Following ...
Sunday, May 8, 2016 by M

Chemistry- Dr.Bob222
What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Work: Ksp = x^2 /(2x+10)^2 = 1.8 x 10^-10 Now I am confused....... At ...
Sunday, May 8, 2016 by Nevaeh

Chemistry- Dr.Bob222
I do not quiet understand what you said. Could you show your work. What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq)
Saturday, May 7, 2016 by Nevaeh

Chemistry- Dr.Bob222
Question 2 What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Is the answer 0.557 M?
Saturday, May 7, 2016 by Nevaeh

Chemistry
You want to neutralize 6 mol of sulfuric acid with 6.0 M sodium hydroxide. How much 6.0 M sodium hydroxide must you add to react exactly with the sulfuric acid? 2NaOH(aq)+H2SO4(aq)-->2H2O(l)+Na2SO4(​aq) 2 moles sodium hydroxide for every 1 mol sulfuric acid. I do not...
Saturday, May 7, 2016 by Kierstin

chemistry
A 15.0 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. This aqueous mixture then reacts with aqueous potassium chloride to form 3.97 g of solid. Calculate the percent by mass of silver nitrate in the first mixture.
Saturday, May 7, 2016 by Chuck

Chemistry
How do you transform an alcohol into an alkene? The example I need help with is: What are the reagents to transform 1,2-dimethyl-propanol to 4,5-dimethyl-2-hexene? This must be done in two steps.
Saturday, May 7, 2016 by Alice

Chemistry
A sample of 20.0 g of chlorine gas at 15 degrees Celsius occupies a volume of 5.0 L. What is the pressure of the gas?
Saturday, May 7, 2016 by Lauren

Chemistry
What are the possible reagents needs to transform 1-butene to 2-butene? This can be done in two steps.
Saturday, May 7, 2016 by Alice

Chemistry
What volume of oxygen gas is needed for the complete combustion of 4.00 L of ethane gas, C2H6? Assume that the temperature and pressure of the reactants are the same.
Saturday, May 7, 2016 by Lauren

Chemistry
What will happen if 2NaCl+CaCO3+SiO2 heated at 1200°C till it turns into liquid form.
Saturday, May 7, 2016 by Ashvin

Chemistry
0.75 L of a 48.5 %V/V methanol solution is diluted to make 5.60 L of solution. What is the final concentration of this solution?
Saturday, May 7, 2016 by JavaCompiler

Chemistry
How would one work through this problem? -Calculate the number of liters of 1.25M solution that can be made from 6.400g of barium nitrate. - I know that it's just stoichiometry, but I'm confused. The formula for molarity is the number of moles of the solute divided by ...
Saturday, May 7, 2016 by Charlie

Chemistry
At 25 °C, an aqueous solution has an equilibrium concentration of 0.00147 M for a generic cation, A (aq), and 0.000735 M for a generic anion, B2–(aq). What is the equilibrium constant, Ksp, of the generic salt A2B(s)?
Friday, May 6, 2016 by Jordan

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Homework Help: Science