Tuesday
August 4, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
What salt results from the neutralization of acetic acid with potassium hydroxide?
Thursday, March 12, 2015 by Ciaria

Chemistry
Calculate the concentration of OH− and the pH value of an aqueous solution in which [H3O+ ] is 0.014 M at 25°C. Is this solution acidic, basic or neutral?
Thursday, March 12, 2015 by Jennie

Chemistry help please
A student collected the following data for a fixed volume of gas:  Temperature(C) pressure(mm of hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer.
Thursday, March 12, 2015 by Ciaria

chemistry
Initially, 0.600 mol of A is present in a 4.00-L solution. 2A[aq]->2B[aq]+C[aq] At equilibrium, 0.200 mol of C is present. Calculate K.
Thursday, March 12, 2015 by kelsey

Chemistry
A chemist reacts 112 g of iron with 72 g of water. State which reactant is the limiting reagent. Calculate what is the maximum yield in grams of Fe3O4 that could be produced in this reaction. For the substance that is not the limiting reagent, calculate the amount in excess.
Thursday, March 12, 2015 by Lily

chemistry
In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not sure how to ...
Thursday, March 12, 2015 by alyssa

Chemistry
What volume of .225 M aluminum chloride solution contains 5.0 g solute?
Thursday, March 12, 2015 by Susan

chemistry
How many grams of hydrogen are released by the reaction of 1.00 g of aluminum with excess potassium hydroxide solution assuming 100% yield
Thursday, March 12, 2015 by juan

chemistry
what volume of a 2.4 mol/L magnesium oxide solution contains 2.3 mol of magnesium oxide?
Thursday, March 12, 2015 by sharon

chemistry
how many ml of 0.655 M phosphoric acid solution is required to neutralize 15 ml of 1.284 M NaOH solution, write a balanced chemical equation
Thursday, March 12, 2015 by Anonymous

Chemistry
How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius
Thursday, March 12, 2015 by Lucy

chemistry
is acid rain homogeneous or heterogeneous mixture?
Thursday, March 12, 2015 by jueli

chemistry
A 11.0g sample of compound containing only oxygen and carbon produces 3.0g carbon and 8.0g oxygen. Determine the empirical formula of the compound.
Thursday, March 12, 2015 by Anonymous

Chemistry
Calculate the mass of 5.35 mol of iodine
Thursday, March 12, 2015 by Jose

Chemistry
I have a question here: What is the definition of bubble-point line? a) The line that shows when the liquid begins to boil/evaporate b) The vapor-mixture liquid region c) Saturated liquid equilibrium line d) None of the above My textbook says it is saturated liquid equilibrium...
Thursday, March 12, 2015 by Swaastikaa

Chemistry
What is the empirical formula for a compound that is 1.67g Ce and 4.54g I?
Thursday, March 12, 2015 by Tiffany

Chemistry
a solution of methanol, CH3OH, contains 55.0 grams of methanol for every 100. grams of water. what is the molality of the solution? Which is my solvent? And which is my solution? Im confused
Wednesday, March 11, 2015 by Anonymous

chemistry
If 5.40 kcal of heat is added to 1.00 kg of ice at 0⁰C, how much liquid water at 0⁰C is produced?
Wednesday, March 11, 2015 by Ciaria

chemistry
The freezing of water at 0⁰C can be represented as follows: H2O (l) ↔ H2O(s) The density of liquid water is 1.00 g/cm3. The density of ice is 0.92 g/cm3. explain why applying pressure causes ice to melt.
Wednesday, March 11, 2015 by Ciaria

Chemistry
The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14.
Wednesday, March 11, 2015 by Ciaria

chemistry
Calculate the hydroxide ion concentration of a solution with pH = 8.25.
Wednesday, March 11, 2015 by Ciaria

chemistry
explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk.
Wednesday, March 11, 2015 by Ciaria

chemistry
Why must the number of electrons lost equal the number of electrons gained in every redox reaction?
Wednesday, March 11, 2015 by Ciaria

Chemistry help please
You have two sealed jars of water at the same temperature. In the first jar there is a large amount of water. In the second jar there is a small amount of water. how the vapor pressure of water in the first jar compares with the vapor pressure of water in the second jar.
Wednesday, March 11, 2015 by Ciaria

Chemistry help please
What type of radiation is emitted when K-38 decays into Ca-38?
Wednesday, March 11, 2015 by Ciaria

chemistry
if 4.75 g of cooper and 3.20 g of sliver are available to react ,what is the limiting reactant
Wednesday, March 11, 2015 by Jonathon

Chemistry help please
What is the oxidation number of phosphorus in P2O3? O mostly always has a -2 charge, three O's = -6. The two P atoms must balance that charge with +6 since P2O3 overall has no charge. If 2 P = +6, then 1 P = +3. is that right ?
Wednesday, March 11, 2015 by Ciaria

Chemistry ( I NEED HELP, PLEASE!!!, IM DESPERATE!)
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ)→ NaOH(aq) + O2(g). What mass of O2 is produced when 81 g of Na2O2 react?
Wednesday, March 11, 2015 by Farrell

CHEMISTRY HELPPPP!!!!!!!!!
Consider the decomposition of NH3 (g). 2 NH3 (g) → N2 (g) + 3 H2 (g) The reaction is catalyzed on a surface of either tungsten or osmium. The activation energies for the catalyzed and uncatalyzed reactions are given below. W Ea = 163 kJ/mol Os Ea = 197 kJ/mol No catalyst...
Wednesday, March 11, 2015 by anon

Chemistry 2
A United Nations toxicologist studying the properties of mustard gas, S(CH2CH2Cl)2, a blistering agent used in warfare, prepares a mixture of 0.675 M SCl2 and 0.973 M C2H4 and allows it to react at room temperature (20.0°C ). SCl2 (g) + 2 C2H4 (g) --> S(CH2CH2Cl)2 (g) ...
Wednesday, March 11, 2015 by Anonymous

Chemistry( HELP PLEASE, IM DESPERATE!!!)
For the reaction 2CH3OH + 3O2 → 2CO2+ 4H2O, what is the maximum amount of CO2 which could be formed from 13.97 g of CH3OH and 5.45 g of O2? Consider the reaction H3PO4 + 3NaOH → Na3PO4 + 3H2O. How much Na3PO4 can be prepared by the reaction of 3.43 g of H3PO4 with ...
Wednesday, March 11, 2015 by Farrell

Chemistry( I NEED HELP, PLEASE!!!!, IM DESPERATE)
What is the limiting reactant when 45.9g of CuO are exposed to 2.57 g of H2 according to the equation CuO(s) + H2(g)−→Cu(s) + H2O(g) ? 1.CuO 2.Unable to determine. 3.H2 4.Neither is limiting.
Wednesday, March 11, 2015 by Farrell

Chemistry ( I NEED HELP, PLEASE!!!!, IM DESPERATE)
What mass of water is needed to react com- pletely with the Na2O2?
Wednesday, March 11, 2015 by Farrell

Chemistry ( I NEED HELP, PLEASE!!!!, IM DESPERATE)
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ)→ NaOH(aq) + O2(g). What mass of O2 is produced when 81 g of Na2O2 react?
Wednesday, March 11, 2015 by Farrell

chemistry
explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk.
Wednesday, March 11, 2015 by Ciaria

chemistry
why water expands when it freezes? Water expands when it freezes because it starts to bend. when all the water molecules are in this hexagonal structure, the same amount of water takes up more space than when the molecules are randomly arranged. For example- In the ocean ...
Wednesday, March 11, 2015 by Ciaria

Chemistry
You have two sealed jars of water at the same temperature. In the first jar there is a large amount of water. In the second jar there is a small amount of water. how does the vapor pressure of water in the first jar compares with the vapor pressure of water in the second jar.
Wednesday, March 11, 2015 by Ciaria

chemistry
how perspiration helps keep you cool on a hot day.? Perspiration keep’s you cool on a hot day because your really steamy and sweaty. You have no energy or strength to move. Your sweat drys up from your skin taking a little bit of your body heat with it. Is this good ?
Wednesday, March 11, 2015 by Ciaria

Chemistry
For the reaction 2CH3OH + 3O2 → 2CO2+ 4H2O, what is the maximum amount of CO2 which could be formed from 13.97 g of CH3OH and 5.45 g of O2? Answer in units of g. Consider the reaction H3PO4 + 3NaOH → Na3PO4 + 3H2O. How much Na3PO4 can be prepared by the reaction of...
Wednesday, March 11, 2015 by Farrell

Chemistry
What is the limiting reactant when 45.9g of CuO are exposed to 2.57 g of H2 according to the equation CuO(s) + H2(g)−→Cu(s) + H2O(g) ? 1.CuO 2.Unable to determine. 3.H2 4.Neither is limiting.
Wednesday, March 11, 2015 by Farrell

chemistry
why gasoline wouldn't dissolve in water ?
Wednesday, March 11, 2015 by Ciaria

Chemistry
What happens when Potassium Oxide is left on a watch glass and exposed to air?
Wednesday, March 11, 2015 by Anonymous

Chemistry HW!!!
1. If I dilute 75 mL of 0.50 M CaF2 solution to a final volume of 375 mL, what will be the molarity of the resulting solution? 2. What will be the final volume of the solution be if I start with a 250 mL of 1.38 M MgCl2 solution to make a solution with a concentration of 0.30 ...
Wednesday, March 11, 2015 by Theresa

chemistry
how many molecules are in 5.5 moles of oxygen gas? How many atoms are in this quantity of gas? I used dimensional analysis and did: 5.5 mol. of oxygen x 6.02x10^23 molecules/1 mol of oxygen I got 3.3x^24 molecules of oxygen How do I find the # of atoms? I know that there are 2...
Wednesday, March 11, 2015 by ally

Chemistry
Can someone please help me figure out whether aqueous sodium sulfite is acidic or basic? I know it is a salt produced from sodium hydroxide and sulfur dioxide.
Wednesday, March 11, 2015 by Anonymous

Chemistry
3.05 g of hydrated copper sulfate produce 1.94 g of anhydrous salt. Assuming complete removal of water of crystallisation, determine the formula of hydrated copper sulfate.
Wednesday, March 11, 2015 by Melissa

chemistry
when 5g of impure sample of CH4 is completely combusted, 9g of H2O was produced.what is the percentage purity of the sample of CH4
Wednesday, March 11, 2015 by john

Chemistry
Calculate the volume at which pH = pKa if 30.00mL of weak acid with a concentration of 0.0955M is titrated against a strong base with a concentration of 0.1233M.
Wednesday, March 11, 2015 by Caroline

Chemistry
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa ). It is often convenient to know ...
Wednesday, March 11, 2015 by dakota

Chemistry
Based on the average number of moles of IO3- in your samples, and the initial volume of those samples, what is the solubility of Ca(IO3)2 in mol/L of the saturated solution in 0.01 M KIO3? My average molarity was: .000092 My sample volume was: 5ml or .005 L
Wednesday, March 11, 2015 by Ane

Chemistry
Replace names by formulas and indicate oxidation and reduction agents (do not balance reactions). copper(ll) oxide + CH30H (Iq) ->CH20 (Iq) + cu (s)
Wednesday, March 11, 2015 by Anonymous

Chemistry
Find density of C02 at room temperature and normal pressure.
Wednesday, March 11, 2015 by Anonymous

Chemistry
At a deep-sea station 200. m below the surface of the Pacific Ocean, workers live in a highly pressurized environment. How much gas at STP must be compressed on the surface to fill the underwater environment with 2 × 107 L of gas at 22 atm? Assume that temperature ...
Tuesday, March 10, 2015 by Radio Active Wear

Chemistry
Are acids or bases suppose to react with carbonates?
Tuesday, March 10, 2015 by Anonymous

chemistry
10 l of a solution containing 1.5 moles of HI
Tuesday, March 10, 2015 by David

Chemistry
a solution of 25 ml of HCL is neutralized by 42.5 ml of 0.10 M concentration of NaOH.Need to write a balanced equation for the reaction
Tuesday, March 10, 2015 by Noah

Chemistry
Find the Density of xenon of STP
Tuesday, March 10, 2015 by Allison

Chemistry
Find temperature of 20.0g of nitrogen that occupies volume of 500.0ml at pressure 0.45 bar.
Tuesday, March 10, 2015 by Allison

chemistry
Find volume of carbon dioxide occupied by 1.0g of CO2 at 0 degrees Celsius and pressure 25.0 torr.
Tuesday, March 10, 2015 by Allison

Chemistry
Find pressure exerted by 2.0g of helium enclosed in a 100.0 ml container at 25 degrees Celsius
Tuesday, March 10, 2015 by Allison

Chemistry
Explain Why some ionic compounds are soluble in water. Explain why non-ionic compounds, such as ethanol or sugar are soluble in water. Explain what a saturated solution.
Tuesday, March 10, 2015 by Allison

Chemistry
What is the pH of a solution prepared by mixing 500mL of 2.0M HCN (Ka= 4.9x10^-10) with 500mL of 1.0 M KOH?
Tuesday, March 10, 2015 by George

Chemistry
How to prepare 250ml of 0.2 M hydrochloric acid from 2.5 M hydrochloric acid.
Tuesday, March 10, 2015 by Allison

Chemistry
A student mixes 5.0 mL of 0.00200 M Fe(NO3)3 with 5.0 mL 0.00200 KSCN. She finds that the concentration of FeSCN2+ in the equilibrium mixture is 0.000125 M. Follow these steps to determine the corresponding experimental value of Kc for the reaction of Fe3+ and SCN– to ...
Tuesday, March 10, 2015 by anon

chemistry
Find volume (in ml) of 0.3 M solution of sodium chloride containing exactly 3.0g of sodium chloride.
Tuesday, March 10, 2015 by Allison

Chemistry
how to prepare 100.0 ml of 0.2 M solution of sodium hydroxide
Tuesday, March 10, 2015 by Allison

Chemistry
A solution contains one or more of the following ions: silver, barium, and Copper (II). CY 105 student adds sodium chloride to a small sample of the solution of the unknown and a white precipitate is formed. He/she filters out the precipitate and then add sodium carbonate to ...
Tuesday, March 10, 2015 by Allison

Chemistry
how much vinegar produces 0.240 moles of acetic acid?
Tuesday, March 10, 2015 by Claire

chemistry
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0x10^-8. pH before the addition of any KOH? pH after the addition of 25 mL of KOH? Please show the steps to solving this...
Tuesday, March 10, 2015 by Francesca

CHemistry
Calculate the pH at the equivalence point for the titration of 0.140 M methylamine (CH3NH2) with 0.140 M HCl. The Kb of methylamine is 5.0× 10–4.
Tuesday, March 10, 2015 by Francesca

Chemistry
What is the pH of a solution made by mixing equal vlumes of .10 M HC2H3O2, .1 M NaOH, and .05 M HCl?
Tuesday, March 10, 2015 by Bob

Chemistry
1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution resists a change in pH.* 2)Calculate the pH when ...
Tuesday, March 10, 2015 by JUNDY

chemistry
Iron is obtained commercially by the reaction of hematite (Fe2O3) with carbon monoxide. How many grams of iron is produced when 35.0 moles of hematite react with 41.5 moles of carbon monoxide? Fe2O3(s) + 3 CO(g) 2 Fe(s) + 3 CO2(g)
Tuesday, March 10, 2015 by Aim

Chemistry
How many moles of NH3 must be added to 1.00 L of solution to dissolve 0.979 g of CuCO3? For CuCO3, Ksp = 2.3 × 10-10.
Tuesday, March 10, 2015 by Jane

chemistry
find the volume of 0.1 M hydrochloric acid required to react with 22.0ml of 0.07 M barium hydroxide
Tuesday, March 10, 2015 by Allison

chemistry
find volume of 0.2 M sulfuric acid required to react with 15.0 ml of 0.25 M sodium hydroxide
Tuesday, March 10, 2015 by Allison

chemistry
find mass of magnesium nitride produced in reaction of 5.0of magnesium with 10.0gof nitrogen. the reaction was carried out in a closed container
Tuesday, March 10, 2015 by Allison

Chemistry
1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution resists a change in pH.* 2)Calculate the pH when ...
Tuesday, March 10, 2015 by JUNDY

chemistry
find composition of post-reaction mixture if 10.0g of sulfur and 20.0g of iron were reacted in a closed container producing iron (II) sulfide
Tuesday, March 10, 2015 by Allison

chemistry
find mass of sulfuric acid obtained in reaction of 20.0g if sulfur trioxide with excess of water
Tuesday, March 10, 2015 by Allison

Chemistry
1)A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. *A buffered solution resists a change in pH.* 2)Calculate the pH when ...
Tuesday, March 10, 2015 by JUNDY

chemistry
find mass of calcium carbonate obtaqined in reaction of 10.0g of calcium oxide with an excess of carbon dioxide
Tuesday, March 10, 2015 by Allison

chemistry
if the concentration of all the reactants doubled, what works happen to the rate I know the reaction rate would increase, but in a previous example it asked the question and the answer was that the rate increases by 16 and I can't figure out how much it would increase for ...
Tuesday, March 10, 2015 by alyssa

Chemistry
At a deep-sea station 200. m below the surface of the Pacific Ocean, workers live in a highly pressurized environment. How much gas at STP must be compressed on the surface to fill the underwater environment with 2 × 107 L of gas at 22 atm? Assume that temperature ...
Tuesday, March 10, 2015 by Butterfly Fly

Chemistry
Find the molarity of a sodium hydroxide solution obtained by dissolving 125.0 mg of sodium hydroxide in 50.ml volumetric flask.
Tuesday, March 10, 2015 by Allison

Chemistry Need Help
What is the concentration of Na+ ions if 25.0 mL of 1.50 M NaOH is reacted with 25.0 mL of 1.50 M HCl? I did M*25ML=1.50M*25.0ML M=1.50M*25.0ML/25ML M=1.50 M Na Is it correct?
Tuesday, March 10, 2015 by annoymous

chemistry
What is the equation for the oxidation of beta carotene using hot concentrated potassium permanganate slution? How many ketone molecules will the product have?
Tuesday, March 10, 2015 by sindhu

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 0.46 mol H2S is placed in a 4.6 L container, what is the equilibrium concentration of H2(g) at 700°C? So I thought that by using ice H2 would...
Monday, March 9, 2015 by Caroline

chemistry
if a student mixes 250 grams of Na2O with 300 grams of H2O how many grams of NaOH ?
Monday, March 9, 2015 by Anonymous

Science (Chemistry)
2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm^3. Show all calculations leading to an answer. (I think I solved this correctly...
Monday, March 9, 2015 by Grace

chemistry
a solution is prepared by dissolving145 grams of NaNO3 in 100 grams of water at 80*C. the solution is then cooled to 10*C. how much of the solute will come out of the solution?
Monday, March 9, 2015 by lisa

chemistry
When you add 0.320 g of sodium metal to an excess of hydrochloric acid, you find that 3330 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s) + 2HCl(aq) --> 2NaCl(aq) +H2(g
Monday, March 9, 2015 by Catherine

Chemistry
In photography, unexposed silver bromide is removed from film by soaking the film in a solution of sodium thiosulfate, Na2S2O3. Silver ion forms a soluble complex with thiosulfate ion, S2O32-, that has the formula Ag(S2O3)23-, and formation of the complex causes the AgBr in ...
Monday, March 9, 2015 by Anonymous

Chemistry
According to the kinetic theory, gases consist of particles that A. occupy considerable volume. B. are relatively close together. C. exert attractive and repulsive forces on other particles. D. have motion that is constant, random, and rapid. C?
Monday, March 9, 2015 by Ciaria

chemistry
Absolute zero is A. the temperature at which the motion of particles theoretically ceases. B. defined as 0°C. C. the triple point for water. D. all of the above D?
Monday, March 9, 2015 by Ciaria

Chemistry
Neutralization reaction HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. I'm not sure how to even go about doing ...
Monday, March 9, 2015 by Julie

chemistry 30
Calculate the enthalpy of reaction for the combustion of ethene.
Monday, March 9, 2015 by .

Chemistry
What volume of oxygen gas is needed to react completely with 0.677 L of carbon monoxide gas (CO) to form gaseous carbon dioxide? Assume all volume measurements are made at the same temperature and pressure. Thanks in advance for all help!!
Monday, March 9, 2015 by Ally

chemistry
What volume of oxygen gas can be collected at 1.26 atm pressure and 2.00◦C when 39.7 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆/MnO2 −−−−→ 2 KCl(s) + 3 O2(g) Answer in units of L.
Monday, March 9, 2015 by Ally

chemistry
How many kilocalories are required to produce 12.7g of aluminum?
Monday, March 9, 2015 by dakota

  1. Pages:
  2. <<Prev
  3. 10
  4. 11
  5. 12
  6. 13
  7. 14
  8. 15
  9. 16
  10. 17
  11. 18
  12. 19
  13. 20
  14. 21
  15. 22
  16. 23
  17. 24
  18. Next>>

Homework Help: Science

Members