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May 5, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
acetylsalicylic acid (aspirin) HC9H7O4 is the most widely used pain reliever and fever reducer. Find the PH of 0.040 M aqueous aspirin at body temperature (Ka at 37 C = 3.6 x 10-4) is this correct? initial concentration is 0.040 M. let change in concentration to equilibrium ...
Sunday, October 4, 2015 by patrick

chemistry
How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………… ​3;…..h3O+ or OH- I got 4.6001 x 10-5...
Sunday, October 4, 2015 by patrick

chemistry
how many rb atoms could be placed on a square surface that is 1.0cm on a side? The diameter of a rb atom is 4.95
Sunday, October 4, 2015 by linda

Chemistry
Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look like 2Fe^+3 + 3SO4^-...
Sunday, October 4, 2015 by Christine

Chemistry
You place a piece of paper on a balance and find that its mass is 0.63 g. You add a lump of NaOH to the paper and get a mass of 22.21 g. You remember that you forgot to tare the balance before taking this measurement. You tare the balance, add another lump of NaOH, and read 20...
Sunday, October 4, 2015 by Misaki

chemistry
6.3E10 Mm converted to mm would be? Round the following measurment to three significant figure: 0.90985 cm^2
Sunday, October 4, 2015 by HELP!

chemistry
6.3E7 cm converted to mm would be 4.3cm converted to in would be
Sunday, October 4, 2015 by steph

chemistry
6.3E10 cm converted to ft would be
Sunday, October 4, 2015 by NEED HELP PLEASE

Chemistry
With relation to Avogadro's Constant: How many hydrogen ions are present in 3 moles of dilute sulphuric acid? As sulphuric acid is H2SO4, I'm not sure whether the answer is: 2 x 6 x 10(23) = 1.2 x 10(24) OR 6 x 6 x 10(23) = 3.6 x 10(24) Thank you!
Sunday, October 4, 2015 by Maria

Chemistry
The world’s electrical demand is typically 1.4 x 10^13 W. If all the H2O(g)in the atmosphere suddenly condensed to liquid, and all the enthalpy of this process was captured and converted to electrical energy, for how long would this energy power the world? Assume the ...
Sunday, October 4, 2015 by Anonymous

chemistry
The equations for the heats of the formation of copper (I) oxide,Cu2O and copper(II) oxide,CuO are: 2Cu(s) +1/2 O2(g) CuO(s); ∆Hof =-166.7kj/mol Cu(s) +1/2 O(g) CuO(s); ∆Hof= -155.2kj/mol The first and second ionisation energies of copper are 750 and 2000kj/mol ...
Sunday, October 4, 2015 by felix

chemistry
How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………… ​3;…..h3O+ or OH- I got 4.6001 x 10-5...
Sunday, October 4, 2015 by patrick

Physical Chemistry
A saturated solution of Na2SO4, with excess of the solid, is present at equilibrium with its vapor in a closed vessel. (a) How many phases and components are present? (b) What is the number of degrees of freedom o the system? Identify the independent variables. Suppose that ...
Saturday, October 3, 2015 by Jessica

Chemistry
Aldol Condensation What might be the result if you did not add enough Hydrochloric acid and the final pH remained about 7? -Yield would likely increase and the purity of the product would increase -Yield would likely decrease and the purity of the product would decrease -Yield...
Saturday, October 3, 2015 by Ash

Chemistry
Determine if the ffg are strong, weak, nonelectrolytes: Sulfuric acid - strong? Potassium hydroxide - strong? Carbonic acid - strong? Propyl amine - weak? Potassium iodide -weak? Ethanol - strong ? Glucose - nonelectrolyte? am i right?
Saturday, October 3, 2015 by ELECTROLYTES!

CHEMISTRY !!!
What is the pH of a 0.16M KHSO3 solution at 298 K? a. 4.41 b. 1.31 c. 7.00 d. 1.82 e. 3.89 I did the calculations and my answer came out to be 3.89 but apparently the answer is 4.41. Can anybody explain why ? Thnx in advance
Saturday, October 3, 2015 by Owen

Chemistry
A 250 g sample of water with an initial temperature of 98.8 c loses 7,500 joules of heat. What is the final temperature of the water ?
Saturday, October 3, 2015 by Raul

Chemistry
What is the molarity of Cu2+ in a catalyzed reaction using 3 drops of CuSO4 at .03M in 50.0ml, and what is the molarity of Cu2+ using 6 drops? (Consider the extent of dilution of the 0.1 M CuSO4 solution in preparing the 50 mL reaction solution. Estimate 20 drops/mL.) My Work...
Saturday, October 3, 2015 by Jim

Chemistry
copper sulfate reacts with sodium hydroxide producing copper hydroxide and sodium sulfate.. If sodium hydroxide is the limiting agent how many grams of copper hydroxide should precipitate out?
Saturday, October 3, 2015 by Steve

Chemistry
What is the minimum amount of 6.6 M H2SO4 necessary to produce 22.6 g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H​2(g) I need to find the volume of the H2SO4 Work: 22.6g H2 /2.008g H2 = 11.3 mol H2 11.3 mol H2 * (3molH2SO4/...
Saturday, October 3, 2015 by Finn

organic chemistry
how many atoms are there in 42.2g of sulfur divided by 1.0x10 to 23
Saturday, October 3, 2015 by glenna

chemistry
Codeine (C18H21NO3) is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.064 M codeine hydrochloride (pKb of codeine is 5.80)? Thank you.
Friday, October 2, 2015 by Patrick

Chemistry
1.What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?
Friday, October 2, 2015 by Anonymous

chemistry
5.What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?
Friday, October 2, 2015 by Bryan

chemistry
calculate the molar concentration of 0.1 " AgNO3
Friday, October 2, 2015 by davis

basic chemistry(projectile)
A ball of mass 400g is thrown with an initial velocity of 30.0 ms-1 at an angle of 45.0 degrees to the horizontal.air resistance is negligible.the ball reaches a maximum height H after a time of 2.16s (1)calculate the initail kinetic energy of the ball? (2) the maximum height ...
Friday, October 2, 2015 by chancy

Organic Chemistry
I spotted a commercial TLC plate, coated with silica gel, with a pure benzoin solution. After running the TLC plate in methylene chloride, the benzoin separated into two different spots. Rf values are 0.6 and 0.9. What explains this? A pure material should have only one spot ...
Friday, October 2, 2015 by Sasha

chemistry equilibrium
phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at this temperature...
Thursday, October 1, 2015 by james

chemistry
phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at this temperature...
Thursday, October 1, 2015 by james

Chemistry
The density of water is 1gm/cm^3. Use the density and these dimensions to find the mass of the water in grams in a fish tank. Use the rules of significant figures and rounding to come up with the correct answer. 30 cm width * .075 meters length * 15 inches high I got 8572.5 ...
Thursday, October 1, 2015 by Anonymous

chemistry
A chemist determined by measurements that 0.0850 moles of mercury participated in a chemical reaction. Calculate the mass of mercury that participated in the chemical reaction. Round your answer to 3 significant digits.
Thursday, October 1, 2015 by brittany

AP Chemistry
I am fairly sure that a) is no change, and c) is shifts to the right...but I am not sure about b) and d). Thanks. How does the equilibrium position shift as a result of each of the following disturbances? Sodium bicarbonate undergoes thermal decomposition according to the ...
Thursday, October 1, 2015 by Patrick

Chemistry
Determine the total grams of Potassium Iodate solution
Thursday, October 1, 2015 by Anonymous

AP Chemistry
Hey guys! Thanks in advance for help! Confused on a question: If the rate=k[NO]^2[Br2], and the concentration of Br2 is doubled, what happens to the rate? Maybe Answer: Maybe the rate would increase by a factor of two?
Thursday, October 1, 2015 by Allie

Chemistry
A certain substance undergoes decomposition by a first-order reaction which has equal to 30.0 minutes. If the initial concentration of the substance is 1.28 mol/liter, what will its concentration be after 2.50 hours? 1. 0.36 M 2. 0.040 M 3. -0.32 M 4. 0.020 M 5. 0.16 M 6. None...
Thursday, October 1, 2015 by Jim

chemistry
give products of HgCl2 + KSO4
Thursday, October 1, 2015 by Mary

chemistry
The mass value for Br-79 is 78.918amu. Find the mass of Br-81
Thursday, October 1, 2015 by linda

Chemistry
Helium is mixed with oxygen gas for deep-sea divers. Calculate the percent by volume of oxygen gas in the mixture if the diver has to submerge to a depth where the total pressure is 4.7 atm. The partial pressure of oxygen is maintained at 0.20 atm at this depth.
Thursday, October 1, 2015 by HannahSparks

chemistry
Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the:
Thursday, October 1, 2015 by ray

chemistry
consider the following reaction Ca + 2HCI CaCl2 +h2 identify the substance that is oxidized identify the substance that is reduced identify that is oxidizing agent identify the reducing agent
Thursday, October 1, 2015 by woin hareg

Chemistry
you are a public health officer in the water treatment facility for a city of 50,000 people . A concentration of 1.0 ppm of fluoride in the drinking water is sufficient for the purpose of helping to prevent tooth decay. The compund normally chosen for fluoridation is the same ...
Thursday, October 1, 2015 by Anonymous

Chemistry
Caluculate the mass of ferrous ammonium sulfate (Fe(NH4)2(SO4)2.6H2O) you would need to add to a 4.0 mL volumetric flask to make a solution that is 75 ppm. I've already identified that Fe is 14.24% of the Mohr's salt, but how would the conversion of that go to ppm? Ppm...
Thursday, October 1, 2015 by Ronnie

Chemistry
Suppose the density of 100.0 mL of some liquid was found to be .78 g/mL . What would be the specific gravity of 25.0 mL of the liquid?
Wednesday, September 30, 2015 by Anonymous

Chemistry
Mary was determining the density of a metal cylinder. When recording the diameter, she mistakenly recorded a number that was too small. Will her calculated value for density be too high or too low? Explain
Wednesday, September 30, 2015 by Anonymous

Chemistry
A 0.45-g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 18.9 kJ is given off. What is the energy value (kcal/g) for the oil?
Wednesday, September 30, 2015 by Emma

Chemistry
Suppose the density of 100.0 mL of some liquid was found to be .78 g/mL . What would be the specific gravity of 25.0 mL of the liquid?
Wednesday, September 30, 2015 by Abby

Chemistry
Calculate the mass of a sample of gold that occupies 0.723 cm3. The density of gold is 19.3 g/cm3. Answer in units of g.
Wednesday, September 30, 2015 by a

chemistry
Observe the diagram of the electrolytic cell (A aqueous solution of molten salt with a power supply). The molten salt is lithium flouride. Write the half reaction occuring at the cathode, following the usual style guide and making sure to balance electrons.
Wednesday, September 30, 2015 by johnathan

Science
I am writing a mock biotechnology research proposal for class and I don't know what I should make this research plan about. What are some of the most breaking scientific news, or diseases and issues in this field(biology preferred, or chemistry) that are currently having ...
Wednesday, September 30, 2015 by Betty

Chemistry
The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer. I got this so far : Kw = 1.219x 10^-14 [H+]^2= 1.219 x 10^-14 [H+]= -/(1.219) x 10^14 [H+] = 1.104 x 10^-7 pH= -log [H+] pH...
Wednesday, September 30, 2015 by Swag

Chemistry
If you have light that has a frequency of 2.88 x 10 to -9 power Hz, what is the wavelength? I don't know how to do this and what formula to use.
Wednesday, September 30, 2015 by Jessica

chemistry
what is the total molarity of all the ions present in 0.1M cuso4 and 0.1M al2(so4)3 solution?
Wednesday, September 30, 2015 by banda

chemistry
find the# of molecules in 5.3 moles of h20
Wednesday, September 30, 2015 by robert

chemistry
Determine the pH of a 0.045mol dm–3 solution of sodium ethanoate (ethanoic acid: pKa=4.75).
Wednesday, September 30, 2015 by Kay-Anna

chemistry
Recrystallization Lab What are the potential consequences of using a spatula to scrape crystals from wet filter paper during filtration?
Wednesday, September 30, 2015 by Andrew

chemistry
Explain why using a Büchner funnel with vacuum to filter hot fluid will result in clogging. What is the result of reduced pressure on a hot volatile solvent? How does this affect the amount of solute that is dissolved? Where would the funnel become clogged?
Wednesday, September 30, 2015 by L

Chemistry
For the following reaction, 9.91 grams of sulfur are allowed to react with 20.8 grams of carbon monoxide . sulfur(s) + carbon monoxide(g) sulfur dioxide(g) + carbon(s) is the maximum amount of sulfur dioxide that can be formed? What is the FORMULA for the limiting reagent? ...
Tuesday, September 29, 2015 by Julian

Chemistry
You are given 7.80g of Bromine gas in a container. Under identical conditions, you have 12.8g of an unknown gas. What is the molar mass of the unknown gas? - so, considering the molar mass of Bromine that I used was 159.808g/Mol, I did: 7.80g Br / 159.808g/mol = 12.8g unknown ...
Tuesday, September 29, 2015 by Hero

Chemistry (check)
Are the following names correct? CN- cyanide ion H2O dihydrogen monoxide ClO2 chlorite ClO4- perchlorate N2O dinitrogen monoxide GeF4 germanium tetrafluoride SO32- sulfite IF3 iodine trifluoride PO33- phosphite NH3 nitrogen dihydrogen ICl3 iodine trichloride SF4 sulfur ...
Tuesday, September 29, 2015 by Anonymous

chemistry
What is the molecular weight and formula for petroleum ether?
Tuesday, September 29, 2015 by Lauren

Chemistry
Hello! I really need help with this. Name the following salts according to the old -ic, -ous system and the stock system. a. CrS b. Cr2O3 c. CrI3 X 6H20 d. CuCl e. CuI2 f. CuBr2 x 4H20 g. HgCl2 h. Hg2Cl2 i. Fe (OH)3 I am totally lost. I don't know how to name these. I have...
Tuesday, September 29, 2015 by Rebecca

Chemistry
What is the mass in grams of Br in 8.53 moles of FeBr5?
Tuesday, September 29, 2015 by Racheal

Chemistry
30g of TiCl4 is mixed with 18g of water to from TiO2 and HCl. Write the chemical reaction and balance it.How much TiO2 is produced. my answer: TiCl4+2H2O= TiO2+4HCl
Tuesday, September 29, 2015 by Anonymous

CHEMISTRY
IS THIS RIGHT? Name the following binary acids: HF(aq) – Hydrofluoric Acid HCl (aq)– Hydrochloric Acaid H2Se(aq) – Hydroselenide Acid HBr(aq) – Hydrobromic Acid HI (aq)– Hydroiodic Acid H2Te (aq)- hydrotelluric acid
Tuesday, September 29, 2015 by rebecca

General Chemistry
An experiment calls for you to use 100 mL of 0.65 M HNO3 solution. All you have available is a bottle of 2.7 M HNO3. How many milliliters of the 2.7 M HNO3 solution do you need to prepare the desired solution?
Tuesday, September 29, 2015 by Anonymous

chemistry
Suppose that after measuring the pH of 1.05 M HCl solution, three drops (0.20 mL) of the solution remain behind on the pH electrode. a) When this electrode is then dipped into 100 mL of pure distilled water, show by calculation that the pH of the water is not pH = 7. b) ...
Tuesday, September 29, 2015 by Nicollette

chemsitry
home / study / questions and answers / science / chemistry / make sure to answer both parts: 1)balance the following ... Your question has been posted. We'll notify you when a Chegg Expert has answered. Post another question. . Question Edit question make sure to answer ...
Tuesday, September 29, 2015 by marcus

chemistry
Hydrogen iodide decomposes according to the reaction 2HI(g)H2(g) + I2(g) A sealed 1.50 L container initially holds .00623 moles of H2, .00414 moles of I2, and .0244 moles of HI at 703K. When equilibrium constant is reached, the concentration of H2(g) is .00467 M. What are the ...
Tuesday, September 29, 2015 by jude

CHEMISTRY
Suppose a sample of hot iron is dropped in a cup of room temperature water. a) what happens to the temperature of the iron & water? b.) in what direction does heat flow occur? c.) when does heat flow stop? d.) assuming no heat is lost to the environment, compare heat gained ...
Tuesday, September 29, 2015 by Emma

ap chemistry
home / study / questions and answers / science / chemistry / balance the following example of a heterogeneous ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. . Question Balance the following example of a heterogeneous equilibrium ...
Tuesday, September 29, 2015 by martika

chemistry
Write potassium sulphate +barium nitrate ¨ potassium nitrate + barium sulphate as a balanced symbol equation
Tuesday, September 29, 2015 by natalie

Chemistry
Suppose density of 100.0 mL of some liquid was found to be 0.789 g/mL. What would be the specific gravity of 20.0 mL of this liquid?
Tuesday, September 29, 2015 by Annie

Chemistry
When 0.100 g of calcium oxide is added to 125 g of water at 23.6°C in a coffee cup calorimeter, this reaction occurs: CaO (s) + H2O(l) -> Ca(OH)2 (aq) ∆H = -81.9kJ/mol If the specific heat capacity of water is 4.184 J g-1 °C-1, what is the final temperature of...
Tuesday, September 29, 2015 by John

Chemistry
Calculate the energy in joules of microwave radiation of wavelength 12.7 centimeters. (E = hν, h = 6.63 × 10-34 J.sec; speed of light = wavelength × ν, speed of light = 3.0 × 108 meters/sec.)
Tuesday, September 29, 2015 by Destany

chemistry
A mixture of 0.6 mole of al and 0.9 mole of cl2 are allowed to react as 2al+3cl2=2al2o3 . Calculate mass of reactant left unreacted. (al=27gmol-1 , cl=35.5gmol-1 )
Tuesday, September 29, 2015 by ashika

Chemistry
I cannot understand how the mass of the system has changed. There's no need for you to do my work please just explain it to me! :) thanks so much A scientist placed copper powder into a crucible and heated it until all of the copper reacted. The resulting product was ...
Tuesday, September 29, 2015 by nicole

Chemistry
three liquids have densities of 1.15g/m, 0.79g/ml, and 0.95 g/ml. When the liquids, which do not mix, are poured into a graduated cylinder, the liquid at the top is the one with a density, in g/ml, of ?
Tuesday, September 29, 2015 by Lara

Chemistry
hydrocarbon mixture 60% c3h8, 40% CxHy 10 g of mixture was burned with O2 excess to give 29.02 g co2 and 8.8 g h2o. what is CxHy?
Tuesday, September 29, 2015 by Izzy

Chemistry
An ice cube at -6 degrees Celsius increases temperature to 2 degrees celsius. If the ice cube absorbs 550 J of heat, what is the mass?
Monday, September 28, 2015 by Anon

Chemistry
The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 450. g of pure Cu?
Monday, September 28, 2015 by Meghan

Chemistry
How many atoms are in 448 grams of carbon?
Monday, September 28, 2015 by Heidi

chemistry
suppose that after measuring the pH of 1.05 M HCl solution, three drops (0.20 mL) of the solution remained behind on the pH electrode. a) when this electrode is then dipped into 100 mL of pure distilled water, show by calculation that the pH of the water is not pH= 7
Monday, September 28, 2015 by Nicollette

Chemistry
1. Write 86,400 s in exponential notation. My answer: 8.6400 x 10^4 s 2. Write 0.15 ns using exponential notation with units of s. My answer: 0.15 x 10^-9 3. 141000 g =? kg My answer: 141 kg 4. Write 1.4 Mg using exponential notation with units of g. My answer: 1.4 x 10^6 g 5...
Monday, September 28, 2015 by Anonymous

Chemistry
4.760 g of a substance (containing only C, H, and O) is burned in a combustion analysis apparatus. The mass of CO2 produced is 1.276×101 g, and the mass of H2O produced is 3.134 g. What is the empirical formula of the compound? I keep getting CH5O2, which is incorrect!
Monday, September 28, 2015 by Sarah

chemistry
Predict which pure substance has the following chemical and physical properties: white solid at room temperature, high melting point, soluble in water, highly conductive when dissolved in water, reactive with acids, and high pH. A) zinc oxide B) sodium hydroxide C) molecular ...
Monday, September 28, 2015 by Jacob Harver

Chemistry
Ammonia may be oxidised to nitrogen monoxide in the presence of catalyst according to the equation 4 NH3 + 5 O2 gives 4 NO and 6 H2O. If 27 litres of reactants are consumed , what volume of nitrogen monoxide is produced at the same temperature and pressure.
Monday, September 28, 2015 by b.s. chandrshekar

chemistry
how i can prepare 0.6M 6H3PO4(250ml).
Monday, September 28, 2015 by mostafa

chemistry
A student determines the zinc content of a solution by first precipitating it as zinc hydroxide, and then decomposing the hydroxide to zinc oxide by heating. How many grams of zinc oxide should the student obtain if her solution contains 38.0 mL of 0.501 M zinc nitrate?
Monday, September 28, 2015 by Julian

Chemistry
cube of aluminum that measures 5 cm on each side is added to a 500 ml- graduated cylinder containing 200 ml of water.  What is the new level of the water in the graduated cylinder after the cube of aluminum is added?  
Monday, September 28, 2015 by Sammie

AP chemistry
Hydrogen sulfide decomposes according to the following reaction, for which Kc = 9.30 10-8 at 700°C 2 H2S(g) 2 H2(g) + S2(g) If 0.51 mol H2S is placed in a 3.0 L container, what is the equilibrium concentration of H2(g) at 700°C?
Monday, September 28, 2015 by Canaan

Chemistry
The question says: when .422 g of phosphorus is burned, .967 g of a white oxide is obtained. Determine the empirical formula of the oxide. I did the calculations and got that there would be 1 mole Phosphorus and 4.29 mol Oxygen. To get the empirical formula, I would need to ...
Monday, September 28, 2015 by Amelia

chemistry
a balloon filled with helium gas occupies 2.50 L at 25C and 1.00 atm. When released, it rises to an altitude where the temperature is 20C and the pressure is only 0.30 atm. Calculate the new volume of the balloon.
Monday, September 28, 2015 by hayley

Chemistry - Radioactivity
The activity of a sample of Ba-137m has decreased by 75% from its initial activity after 5.10 minutes. What is the half-life of Ba-137m? What fraction of activity remains after 6.25 minutes? (A=Aoe (-kt); k = .693/t1/2)
Sunday, September 27, 2015 by William

Chemistry
The strontium-87 isotopes stores in the body and decays by the process shown below. The half-life is 2.80hr. Suppose that 0.766 millicuries got into the body. How many mc will remain after 8.40 hr?
Sunday, September 27, 2015 by Morgan

chemistry
Write the net ionic equation for the following molecular equation. HNO3 is a strong electrolyte. NaNO2(aq) + HNO3(aq)--> NaNO3(aq) + HNO2(aq) HNO2 is a weak electrolyte.
Sunday, September 27, 2015 by Megan

Chemistry
The strontium-90 isotope decays by the reaction below. It has a half-life of 28 yr. If the initial activity of this isotope was 168dpm, what would the activity be after 28.0 yr?
Sunday, September 27, 2015 by Morgan

Chemistry
100mls of propane gas in grams. Pressure is equal to one atmosphere
Sunday, September 27, 2015 by Anonymous

chemistry
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 14.4 g of carbon were burned in the presence of 55.2 g of oxygen, 16.8 g of oxygen remained unreacted. What mass of carbon dioxide was produced?
Sunday, September 27, 2015 by liz

Chemistry
Which one of the following is a diastereomer of (2R,3R)-2,3-dibromopentane? How do I got about this?
Sunday, September 27, 2015 by chemmy

Organic Chemistry
Are n-pentyl chloride and n-pentyl bromide miscible or immiscible? Why?
Sunday, September 27, 2015 by Sasha

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