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November 23, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Will a fluoride concentration of 1.0 mg/L be soluble in a water containing 200 mg/L of calcium? This is what i found for ksp CaF2<--> Ca(2+) +2F(-) Ksp=(x)(4x^2) where x=solubility Therefore, Ksp=3.7 x 10^-11 and for Qsp I am not sure how to go on about calculating that.
Sunday, October 21, 2012 at 10:07pm

Chemistry problem
The volume of an ideal gas contracts from 5.68 L to 2.35 L as the result of a constant applied pressure of 1.48 atm. The system releases 733 J of heat during this process. Calculate deltaU (internal energy) for this process. Express answer in Joules. Please help, thank you ...
Sunday, October 21, 2012 at 9:59pm

chemistry help
An amount of 414.27 g of zinc sulfide (ZnS, MM=97.44 g/mol) reacts with 99.58 g of oxygen gas (O2, MM=31.999 g/mol) at a constant temperature of 298.0 K and constant pressure of 1.00 atm. The reaction: 2 ZnS(s) + 3 O2(g) --> 2 ZnO(s) + 2 SO2(g) dH = -818.58 kJ a) How much ...
Sunday, October 21, 2012 at 9:58pm

chemistry
When the iron(II) ammonium sulfate was mixed with the ferrocyanide ion, the precipitate was initially white but turned blue upon exposure to air. What happened to iron(III) ion when the precipitate turned blue?
Sunday, October 21, 2012 at 9:54pm

Chemistry
I titrated 0.25g of soda ash mixed with 25mL of deionized water and it took 43.7mL of hydrochloric acid to complete the titration. I am trying to figure out how to find the moles of sodium carbonate in the soda ash and then the percent of sodium carbonate in the soda ash. How ...
Sunday, October 21, 2012 at 9:35pm

Chemistry
Write the chemical equation for the standard molar enthalpy of formation of periodic acid, H5IO6.
Sunday, October 21, 2012 at 9:01pm

Chemistry
A sample of benzoic acid contaminated with NaCl and sand is to be recrystallized: Benzoid Acid: Solubility in water at 100 degrees Celsius in g/100 mL = 6.8, at 0 degrees Celsius in g/100 mL = 0.2. NaCl: Solubility in water at 100 degrees Celsius in g/100 mL = 39.1, at 0 ...
Sunday, October 21, 2012 at 8:58pm

AP Chemistry
What volume of 0.596M K3PO4 is required to react with 29 mL of 0.864 M MgCl2 according to the equation 2K3PO4 + 3MgCl2 -> Mg3(PO4)2 + 6KCl Answer in units of mL
Sunday, October 21, 2012 at 6:51pm

chemistry
A certain weak base has a Kb of 9.00 × 10-7. What concentration of this base will produce a pH of 10.34?
Sunday, October 21, 2012 at 6:46pm

Chemistry
Mass (before reaction): test tube + HCl(aq) + stir bar + capsule 26.600 g Mass (after reaction): test tube + HCl(aq) + stir bar + capsule 25.300 g Volume of water displaced from the squirt bottle 148 mL Temperature of the CO2(g) 287.4 K Pressure (atm) 1.032 atm Using this data...
Sunday, October 21, 2012 at 6:33pm

chemistry
Calculate the theoretical yield in moles of Fe(C5H7O2)3 for this experiment. Record this number on your data sheet. Calculate the theoretical yield in g Fe(C5H7O2)3 (GMM: 353.18g mol^-1), for this experiment. Record this number on your data sheet. I really need help on these ...
Sunday, October 21, 2012 at 6:06pm

chemistry
why is the bond length an average rather than a fixed number ?
Sunday, October 21, 2012 at 5:08pm

chemistry
How is this equation balanced Al2(OH)3 S3 (s) + 3H2O (l) --->
Sunday, October 21, 2012 at 5:01pm

chemistry
how do the names of covalent compounds differ from the names of ionic compounds?
Sunday, October 21, 2012 at 4:51pm

College Chemistry
Two moles of Mg and five moles of O2 are placed in a reaction vessel, and then the Mg is ignited to produce Mg (F.W.= 40.31 g/mole). What is the actual mole ratio, the calculated mole ratio, how many moles of MgO are formed, and what is the weight of MgO formed?
Sunday, October 21, 2012 at 3:30pm

Chemistry
I am wondering about a conceptual question: In an acid/base reaction is there a way to know for sure when an H2O is going to stay with the larger molecule or break off and form water? here are my two examples: R=cyclohexane R-C=-(triple bonded to)CH + KOH <---> ...
Sunday, October 21, 2012 at 3:11pm

College Chemistry
Using the molar volume (STP) or the ideal gas law equation, determine the molar mass,g/mole, of each of the following. A: 11.2g of a gas that has a volume of 1.50Lat STP? B: .0710g of a gas that has a volume 825ml at 1 atm
Sunday, October 21, 2012 at 2:41pm

College Chemistry
A 14.0 g sample of Krypton has a temperature of 25C at 625mm Hg. What is the volume, in Milliliters, of the krypton?
Sunday, October 21, 2012 at 2:35pm

Chemistry Help Please!!
What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!
Sunday, October 21, 2012 at 2:19pm

chemistry
How is this equation balanced Al2(OH3 S3 (s) +3H2O (l)--->
Sunday, October 21, 2012 at 1:55pm

Chemistry
How long would it take a 20Kw heater to warm up 1000 litres of water from 15 degrees to 55 degrees in hours? specific heat of water = 4.18kJ. also How much heat would a block of ice melting at 200Kg per hour absorb? thanks if anyone can help!
Sunday, October 21, 2012 at 1:51pm

Chemistry problem
The volume of an ideal gas contracts from 5.68 L to 2.35 L as the result of a constant applied pressure of 1.48 atm. The system releases 733 J of heat during this process. Calculate deltaU (internal energy) for this process. Express answer in Joules. Please help, thank you ...
Sunday, October 21, 2012 at 11:06am

chemistry help
An amount of 414.27 g of zinc sulfide (ZnS, MM=97.44 g/mol) reacts with 99.58 g of oxygen gas (O2, MM=31.999 g/mol) at a constant temperature of 298.0 K and constant pressure of 1.00 atm. The reaction: 2 ZnS(s) + 3 O2(g) --> 2 ZnO(s) + 2 SO2(g) dH = -818.58 kJ a) How much ...
Sunday, October 21, 2012 at 11:01am

chemistry
explain why a precipitate forms when silver nitrate solution is added to sodium chloride solution?
Sunday, October 21, 2012 at 8:45am

Chemistry
Calculate the de Broglie wavelength associated with a body of mass 1.5 kg moving with a velocity of 100m/s.
Sunday, October 21, 2012 at 4:41am

Chemistry
someone help pls!! percentage of ethanol in the "blood" sample on a v/v basis is 0.0143% v/v. is the "blood" sample analysed over the limit for driving? (legal limit is 80mg alcohol per 100mL blood. assume the density of ethanol is 0.785g/mL and the density...
Sunday, October 21, 2012 at 2:48am

Chemistry
Calculate the theoretical yield in moles of Fe(C5H7O2)3 for this experiment. Record this number on your data sheet. Calculate the theoretical yield in g Fe(C5H7O2)3 (GMM: 353.18g mol^-1), for this experiment. Record this number on your data sheet. I really need help on these ...
Sunday, October 21, 2012 at 2:32am

Chemistry
What property must a substance have if u want to use the substance to make an aqueous solution? Grade- 9
Sunday, October 21, 2012 at 1:49am

chemistry
name the following compound by the stock system (international systemic naming system: 1)Li2CO3 2) MnO2 3) HBrO4 4) (NH4)2 S 5) H3PO3 6) P2O5
Sunday, October 21, 2012 at 1:47am

Chemistry
What property must a substance have if u want to use the substance to make an aqueous solution? Thank you
Sunday, October 21, 2012 at 1:35am

Chemistry
I have a question about this one 2N2O(g) ⇋ O2(g) + 2N2(g), what happens to the equilibrium position if the pressure decreases? Is going to shift to the right or to the left???
Sunday, October 21, 2012 at 1:06am

Chemistry
how do you balance the equation with H3PO4(aq)and BaCl2(aq)?
Sunday, October 21, 2012 at 12:03am

Chemistry
Based on the following chemical equation answer the question below show all your calculation The balanced chemical reaction of iodine with hydrogen sulfide h2s(g)+i2(s)-----2HI(g) + S(s) (a) Based on the above chemically balanced equation, how many grams of HI should be ...
Saturday, October 20, 2012 at 11:39pm

Chemistry
the following acid—base neutralization reaction HNO3 (aq)+ KOH (aq) --KNO3(aq) + H2O (I) What is the molarity (M) of an HNO3 solution if 50.0ml is needed to react with 25.0ml of 0.150M KOH solution?
Saturday, October 20, 2012 at 11:39pm

chemistry
How would you prepare 1000.0ml of 0.600M NaOH solution starting from concentration of 1.000M.
Saturday, October 20, 2012 at 11:38pm

Chemistry
If the standard enthalpy of formation of PH3(g) is +5.4 kJ mol-1, calculate the reaction enthalpy for 2PH3(g)--->2P(s)+3H2(g)
Saturday, October 20, 2012 at 11:23pm

Chemistry
When 10.0 g of ammonium nitrate (molar mass= 80 g/mol) are dissolved in 1.00 L of water in a bomb calorimeter with a heat capacity of 2.30 kJ/ K, the temp drops 1.52 K. What is the molar enthalpy of solution of ammonium nitrate?
Saturday, October 20, 2012 at 11:22pm

Chemistry
The standard enthalphies of formation of ozone, O3(g), and oxygen atoms are +142.70 and +249.17 kJ/mol. Calculate the reaction enthalpy for 2O2(g)-->O3(g)+O(g)
Saturday, October 20, 2012 at 11:16pm

Chemistry
How many mL of 0.200 M H3PO4(aq) must be added to 25.0 mL of 0.0888 M BaCl2(aq) to precipitate all the barium as barium phosphate?
Saturday, October 20, 2012 at 11:09pm

Chemistry
Calculate the number fo moles of NaOH(aq) needed to react completely with 125 mL fo 6.00 M H2SO4(aq)
Saturday, October 20, 2012 at 10:14pm

Chemistry
Please show me how to work! thanks When Snno2(s) is formed form the comustion of gray tin, the reaction enthalpy is -578.6 kJ, and when white tin is burned to form SnO2(s), the reaction enthalpy is -580.7 kJ. Calculate the reaction enthalpu for Sn(gray)-->Sn(white)
Saturday, October 20, 2012 at 10:13pm

Chemistry
Please show me how to work! Ethane, C2H6(g) can be made by reaction of hydrogen gas with acetylene, C2H2(g). the standard enthalpies of formation of ethane and acetylene are -84.68 and +226.73 kJ mol-1, respectively. what is the reaction enthalpy for the production of one mole...
Saturday, October 20, 2012 at 10:08pm

Chemistry
If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
Saturday, October 20, 2012 at 9:46pm

chemistry
At 1 atm, how much energy is required to heat 49.0 g of H2O(s) at –12.0 °C to H2O(g) at 169.0 °C?
Saturday, October 20, 2012 at 9:32pm

Chemistry
A mixture of C3H8 and C2H2 has a mass of 2.0g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.
Saturday, October 20, 2012 at 9:27pm

Chemistry
Use principles of atomic structure to Explain why in aqueous solution, (a) potassium forms 1+ but not a 2+ ion (a) Ti3+ is colored but Sc3+ is not. (b) Ti2+ is a reducing agent but Ca2+ is not.
Saturday, October 20, 2012 at 8:46pm

Chemistry
Suppose that a stable element with atomic number 119, symbol Wr, has been discovered. (a) Write the ground-state electron configuration for Wr, showing only the valence-shell electrons. (b) Would Wr be a metal or a nonmetal? Explain in terms of electron configuration. (c) On ...
Saturday, October 20, 2012 at 8:45pm

chemistry
When 1662 J of heat energy is added to 45.9 g of hexane, C6H14, the temperature increases by 16.0 °C. Calculate the molar heat capacity of C6H14.
Saturday, October 20, 2012 at 7:56pm

Chemistry
What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!
Saturday, October 20, 2012 at 7:10pm

Chemistry
For 2 SO2(g) + O2(g) 2 SO3(g), Kp = 3.0 104 at 700 K. In a 2.00-L vessel the equilibrium mixture contains 1.58 g of SO3 and 0.136 g of O2. How many grams of SO2 are in the vessel?
Saturday, October 20, 2012 at 2:03pm

AP Chemistry
Consider the following reaction. CaSO4(s) Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction. (a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium concentrations of ...
Saturday, October 20, 2012 at 2:02pm

chemistry
Consider 4.50L of a gas at 365 mmHg and 20 degree C . If the container is compressed to 2.70 L and the temperature is increased to 33 degree C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder.
Saturday, October 20, 2012 at 8:54am

chemistry
A very flexible helium-filled balloon is released from the ground into the air at 20 degree C. The initial volume of the balloon is 5.00 L, and the pressure is 760 mmHg. The balloon ascends to an altitude of 20km, where the pressure is 76.0 mmHg and the temperature is -50 ...
Saturday, October 20, 2012 at 8:52am

chemistry
What can cause high pressure inside a reactor?
Saturday, October 20, 2012 at 4:16am

Chemistry
Given 1.01 g of H2 in the reaction H2 + 1/2 O2 = H2O. The Delta H for solution is 143 kJ. What is the delta H for the reaction?
Saturday, October 20, 2012 at 12:28am

chemistry
how to find ph of aqueous solution if your only given the concentration
Friday, October 19, 2012 at 11:45pm

chemistry
For 6.0*10^-2 M H2CO3, a weak diprotic acid, calculate the following values. Use ionization constants of H2CO3: Ka1=4.4*10^-7, Ka2=4.7*10^-11, as necessary. PART A: [H3O^+] M PART B: [HCO3^-] M PART C: [CO3^2-] M
Friday, October 19, 2012 at 11:02pm

Chemistry
Performing the same experiment described on your lab manual, a student used a 0.358 g sample of Alka-Seltzer and the mass of CO2 was found to be 0.102 g. Based on this result, answer the following questions: Determine the mass of NaHCO3 that produced the CO2 in the experiment...
Friday, October 19, 2012 at 10:08pm

chemistry
What STP volume of oxygen gas is obtained from the electrolysis of 140.0mLof water? (Hint: The density of water is 1.00g/mL.)
Friday, October 19, 2012 at 7:28pm

chemistry
calculate the moles of indicated product produced when 26.0g of each reactant is used. A. 4Al+3O2---->2AlO3 (Al2O3 B. 3NO2+H2O--->2HNO3+NO (HNO3)
Friday, October 19, 2012 at 7:22pm

chemistry
How many grams of C3H18O2 contain 7.9 e25 atoms of Carbon?
Friday, October 19, 2012 at 6:56pm

Chemistry
When 22.7mL of o.500 M H2SO4 is added to 22.7mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, the temperature rises to 30.17 degrees Celsius. Calculate the delta h of this reaction. (Assume that the total volume is the sum of individual volumes and that ...
Friday, October 19, 2012 at 6:21pm

chemistry
A cylinder with a moveable piston has a volume of 18.7 L at a pressure of 1.2 atm. What will be its volume if the pressure is increased to 1.7 atm?
Friday, October 19, 2012 at 5:44pm

Chemistry
A hot air balloon has a volume of 55,287 m3 at 60C, what is its volume at 20C?
Friday, October 19, 2012 at 3:01pm

chemistry
Why Al(OH)3 precipitation is red ? Is this the result of electron transition? Thanks for your help :)
Friday, October 19, 2012 at 1:24pm

chemistry
Based on the following chemical equation, answer the questions below. Show all your calculation The balanced chemical reaction of iodine with hydrogen sulfide is as follows: H2S(g)+I2(s)-----2HI(g) + S(s) (a) Based on the above chemically balanced equation, how many grams of ...
Friday, October 19, 2012 at 1:10pm

Chemistry
In the following acid—base neutralization reaction HNO3(aq)+ KOH(aq) ----KNO3(aq) + H2O (I) What is the molarity (M) of an HNO3 solution if 50.0 ml is needed to react with 25.0 ml of 0.150M KOH solution?
Friday, October 19, 2012 at 1:06pm

Chemistry
How would you prepare 1000.0ml of 0.600M NaOH solution starting from concentration of 1.000M
Friday, October 19, 2012 at 1:04pm

General Chemistry
What effect would tap water have on the volume of EDTA required for titration?
Friday, October 19, 2012 at 12:50pm

chemistry
Why adding NH4OH to Al3+ , forms Al(OH)3 and not complex ion Al(NH3)3 ? thanks so much
Friday, October 19, 2012 at 12:47pm

chemistry
When nitrogen dioxide (NO2) from car exhaust combines w/ water in the air it forms nitric acid (HNO3), which causes acid rain, and nitrogen monoxide. 3NO2(g)+ H2O(L)----->2HNO3(aq)+ N(g) a.How many molecules of NO2 are needed to react with 0.300 mole H2O? b. how many grams ...
Friday, October 19, 2012 at 11:04am

chemistry
When nitrogen dioxide (NO2) from car exhaust combines w/ water in the air it forms nitric acid (HNO3), which causes acid rain, and nitrogen monoxide. 3NO2(g)+ H2O(L)----->2HNO3(aq)+ N(g) a.How many molecules of NO2 are needed to react with 0.250 mole H2O? b.How many grams ...
Friday, October 19, 2012 at 10:59am

Ap Chemistry
What is the energy of a photon corresponding to radio waves of frequency 1.465 106 /s?
Friday, October 19, 2012 at 10:41am

chemistry
Consider the formation of cyanogen c2n2 and its subsequent decomposition in water given by the equations 2Cu2+ + 6CN- 2[Cu(CN)2]- + C2N2 C2N2 + H2O HCN + HOCN How much hydrocyanic acid HCN can be produced from 35.00 g of KCN, assuming 100% yield?
Friday, October 19, 2012 at 10:05am

chemistry
How many moles of water are there in 5 moles of Tungsten(V)oxalate tetrahydrate?
Friday, October 19, 2012 at 8:14am

Chemistry
A radio wave has a frequency of 3.6 x 10^10 Hz. What is the energy (in J) of one photon of this radiation?
Friday, October 19, 2012 at 1:54am

Chemistry
Silver has an average atomic mass of 107.9 u and is known to have only two naturally occurring isotopes. If 51.84% of Ag exists as Ag-107 (106.9051 u), what is the identity and the atomic mass of the other isotope?
Friday, October 19, 2012 at 1:53am

chemistry
Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?
Friday, October 19, 2012 at 1:06am

chemistry
1. How many grams of NaCl are present in 15 mL of a 2.0% solution?
Friday, October 19, 2012 at 12:51am

Chemistry
Which salts cannot be prepared by an acid-alkali titration method? And why? A. Sodium sulfate B. Ammonium sulfate C. Potassium nitrate D. Iron(II) nitrate
Friday, October 19, 2012 at 12:18am

Chemistry
A solution of NaOH was obtained by dissolving 5.6g of NaOH pellets in 100cm^3 of water. What is the concentration of resulting solution?
Friday, October 19, 2012 at 12:13am

Chemistry
What is the enthalpy change (in kJ) for burning 49.0 g of methyl alcohol? I tried this question and got the wrong answer of 1047.74. A gas is compressed from 73.7 L to 1.9 L at 0.70 atmospheres? In addition a total of 4400 J of heat are gained from warmer surroundings. What is...
Friday, October 19, 2012 at 12:02am

Chemistry
a student used a 0.358 g sample of Alka-Seltzer and the mass of CO2 was found to be 0.102 g. Based on this result, answer the following questions: Determine the mass of NaHCO3 that produced the CO2 in the experiment. Determine the % mass of NaHCO3 in the sample. Determine the ...
Thursday, October 18, 2012 at 11:49pm

ap chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO + O2 yields 2CO2 Delta H for this reaction is -135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1). 270.5 mol 2). 40.5 mol 3). 12.0 mol 4). 5.41 mol 5). 16.3...
Thursday, October 18, 2012 at 11:48pm

ap chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO2 + O2 yields 2CO2 Delta H for this reaction is -566 kJ/mol run. What is the delta H for CO? 1). +270 kJ/mol 2). -110 kJ/mol 3). +65 kJ/mol 4). -405 kJ/mol 5). -65 kJ/mol 6). -182 kJ/mol 7...
Thursday, October 18, 2012 at 11:43pm

ap chemistry ! i am so lost
how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J
Thursday, October 18, 2012 at 11:39pm

ap chemistry ! i am so lost
how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J
Thursday, October 18, 2012 at 11:38pm

ap chemistry :(
consider the reaction C6H14 + 9.5O2 yields 6CO2 + 7H2O at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no work is done as the ...
Thursday, October 18, 2012 at 11:36pm

ap chemistry :(
consider the reaction C6H14 + 9.5O2 yields 6CO2 + &H2) at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no work is done as the ...
Thursday, October 18, 2012 at 11:34pm

chemistry
neon gas is cooled and volume goes from 380L to 250ml and the final temperature is -55 Celsius what is the original temperature??
Thursday, October 18, 2012 at 10:13pm

Chemistry: Partial Pressure
A mixture of 0.166 moles of C is reacted with 0.117 moles of O2 in a sealed, 10 L vessel at 500 K, producing a mixture of CO and CO2. The total pressure is 0.640 atm. What is the partial pressure of CO? Please provide a step by step explanation with the answer so I can ...
Thursday, October 18, 2012 at 10:07pm

Chemistry(Please answer)
How many chirality centers does the compound 1,3-dibromo-2,4-dichloro-5-fluorocyclope​ntane have? This compound has three different elements, a Br which is repeated twice, a cl which is also repeatd twice, and a fluorine. I was thinking that the number of centers would ...
Thursday, October 18, 2012 at 8:58pm

AP CHEMISTRY!!!!
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2 CO(g) + O2(g) → 2 CO2(g) ∆H for this reaction is −566 kJ/mol rxn. What is the ∆H for CO(g)?
Thursday, October 18, 2012 at 8:47pm

Chemistry
The pH of a solution of hydrochloric acid is 1.97. What is the molarity of the acid?
Thursday, October 18, 2012 at 8:24pm

Chemistry
1. Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced? 2. You sometimes hear in a medical show on TV something like “...
Thursday, October 18, 2012 at 6:51pm

Chemistry
Why is the temperature needed to freeze ocean water lower than the temperature needed to freeze the surface of a freshwater lake?
Thursday, October 18, 2012 at 6:29pm

chemistry
Explain how mixing red paint and white paint could be used as an analogy for a neutralization reaction.
Thursday, October 18, 2012 at 6:02pm

chemistry
write the equilibrum constant expression for Kp of the following: a.) O2-->--<2O3(g) b.)SiH4(g) + 2O2(g)-->--<SiO(s) + 2H2O(g) c.)MgO(s) + SO2(g) + O2(g)-->--<MgSO4(s) d.)2PbS(s) + 3O2(g)-->--< 2PbO(s) + 2SO2(g)
Thursday, October 18, 2012 at 5:52pm

Science
Chemistry Enthalpy Calculations? Given the equation: CaO + H2O ----> Ca(OH)2 A 1 g sample of CaO is dissolved in 100 ml water with density 1.00g/ml. The temperature rise is 3.7 degrees C. The specific heat is 4.00 J/g*deg. 1. Calculate the heat (in J) absorbed/given off by ...
Thursday, October 18, 2012 at 5:46pm

phyiscal chemistry
Moving from solid to liquid by changing the pressure, so what happend if u decrease the pressure on a solid at constant temperature?
Thursday, October 18, 2012 at 3:18pm

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