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July 28, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
1. How many grams of calcium chloride (CaCl2) are there in 600.0 mL of an aqueous solution that has a concentration of 0.450 M CaCl2? 2. The conjugate base of HS- is: 3. What mass of calcium chloride, CaCl2, is needed to prepare 3.65 L of a 1.75 M solution? The molar mass of ...
Thursday, November 12, 2015 by angel

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
Thursday, November 12, 2015 by Anonymous

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
Thursday, November 12, 2015 by Anonymous

Chemistry
Predict whether each of the following reactions would be exothermic or endothermic. a. CO(g) --> C(g) + O(g) b. 2H(g) + O(g) --> H20(g) c. Na+(g) + Cl-(g) --> NaCl(s) What is the sign of DH in each of these reactions? Please explain. I am very confused. Thanks
Thursday, November 12, 2015 by Anonymous

Chemistry
Silver oxide is used in small batteries called button batteries (Figure below). It decomposes upon heating to form silver metal and oxygen gas. 2Ag2O(s) → 4Ag(s) + O2(g) How many moles of silver are produced by the decomposition of 4.85 g of Ag2O?
Thursday, November 12, 2015 by Makayla Brad

Chemistry
Nitrogen and oxygen can react directly with one anotheer to produce nitrogen dioxide according to N2(g) + 2O2(g) --> 2NO2(g) The reaction may also be imagined to take place by first producing nitrogen oxide N2(g) + O2(g) --> 2NO(g) which then produces NO2 2NO(g) + O2(g...
Thursday, November 12, 2015 by Sarah

ics
Chemistry,what is the k.e of 4 moles of nitrogen gas at 127 degree centigrade?
Thursday, November 12, 2015 by usman

Chemistry (Check)
In a calorimeter experiment done at constant pressure in which all the heat from a chemical reaction was absorbed by the surrounding water bath, the temperature of the water went up by 2.31 K. If the size of the water bath was 200 g, what was the amount of heat transferred to ...
Thursday, November 12, 2015 by Anonymous

Chemistry
How many moles of gas must be forced into a 4.4 L tire to give it a gauge pressure of 32.4 psi at 30 ∘C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5 psi so that the total pressure in the tire is 46.9 psi .
Thursday, November 12, 2015 by Staci

Chemistry
Oxyacetylene torches are fueled by the combustion of acetylene, C2H2. 2C2H2(g) + 5O2(g) --> 4 CO2(g) + 2H2O(g) If the enthalpy change for the reaction is -2511.14 kJ/molrxn, how much heat can be produced by the reaction of a. 2mol of C2H2? b. 1 mol of C2H2? c. .500 mol of ...
Thursday, November 12, 2015 by Sarah

Chemistry Lab Work Help!
We used a buret today, and I don't get how to calculate volume. I have an initial reading of 49.97 and a final buret reading of 30.49. How do I get the volume? I thought I just subtracted the final from the initial, but someone said their tutor told them to take 50-their ...
Thursday, November 12, 2015 by Anonymous

Chemistry
The reaction between hydrogen and oxygen to produce water gives off heat. What is the source of this heat? how could this heat be measure?
Thursday, November 12, 2015 by Anonymous

Chemistry
On Earth, naturally occurring calcium metal contains 6 isotopes: Ca-40, Ca-42, Ca-43, Ca-44, Ca-46, Ca-48. Select all of the following that are true for a sample of naturally occurring calcium. A) The average mass of the calcium atoms is 40.078 amu. B)One mole of Ca-40 has a ...
Thursday, November 12, 2015 by Kayte

chemistry
Which is the molecular formula of a compound with the empirical formula BCH3 and a molecular mass of 103.38g/mole?
Thursday, November 12, 2015 by Taylee

Chemistry
If I have 4.53*10^-15 moles of tantalum atoms, how many tantalum atoms do I have?
Thursday, November 12, 2015 by Tay

Chemistry - Energy: Phase Changes
An ice cube at 0 degrees Celsius is placed in a pouch and dropped into 30.0g of water in a cup at 45 degrees Celsius. The ice cube melts and the resulting water warms up. The lowest temperature reached by the 30.0g of water in the cup was 20.0 degrees Celsius. What was the ...
Thursday, November 12, 2015 by Kid

Chemistry - Energy: Phase Changes
If 13.4 kJ of energy are added to 1.00 kg of ice at 0 degrees Celsius, how much water at 0 degrees Celsius is produced? How much ice is left? The molar heat of melting is 6.01 kJ/mol. So... 6.01 kJ -> 1 mol (6.01 kJ of energy can melt 1 mole of ice) Then... 13.4 kJ -> x...
Thursday, November 12, 2015 by Kid

Chemistry
Assign oxidation numbers for the following chemical equation: 2Al + 3H2SO4 ---> Al2(SO4)3 +3 H2 What was oxidized? What was reduced? My answer: Oxidation numbers going from the left side of the chemical eq to the right side.. Al: 0 H: +1 S: +6 O : -2 Al: +3 S: +6 O: -2 H: 1...
Thursday, November 12, 2015 by Rucha

institute of health sciences
Chemistry A) determine the mass of sodium hydroxide needed to prepare 100ml of 0.5M standard solution B) describe the procedure used to prepare the standard solution C) use the 100ml stock solution of 0.5M sodium hydroxide to neutralize H2SO4 by volumetric analysis I) ...
Thursday, November 12, 2015 by trendy

Chemistry
Which is easier to remove an electron from, N or O? Why? Is it O? Which is easier to remove an electron from, B or Be? Why? Is it B?
Thursday, November 12, 2015 by Rucha

Chemistry
How man kilojoules of energy are needed to vaporize a 28.6g sample of liquid benzene at its normal boiling point of 80C?
Thursday, November 12, 2015 by Judy

Chemistry
Which element's 4+ ion would have the following electron configuration? [Kr]4d^10
Thursday, November 12, 2015 by Rucha

Chemistry
Nitrogen dioxide is one of the components of photochemical smog. a.The energy required to split NO and O from NO2 is 305 KJ/mol. If there are 6.02E23 particles/mol, what is the energy required to do this? (I got 5.07E24) b. What is the maximum wave length of radiation that ...
Thursday, November 12, 2015 by Brooke N

Chemistry-Dr.Bob
What is the effective nuclear charge of the following? F- Na+ I know that for F- it is 9-7=2 and for Na+ it is 11-2=9, but what about the charges?? I don't understand what effect do the charges make? If 9-7 then isn't it just simply F and not F-? Similarly, if 11-2 ...
Thursday, November 12, 2015 by Rucha

chemistry
can anyone help with this problem please..... Potassium chlorate decomposes according to the following equation: 2KClO3 (s) → 2KCl (s) + 3O2 (g). If a 3.00 g sample of KClO3 is decomposed and the oxygen is collected at 24.0 °C and 0.991 atm, what volume of oxygen gas...
Thursday, November 12, 2015 by angel

chemistry
How many atoms are in a drop of mercury that has a diameter of 1.0 mm? (Volume of a sphere is 4ðr3/3; density of mercury = 13.6 g/cm3)
Thursday, November 12, 2015 by temi

chemistry
What is the pH of a buffer solution that has CH3CO2H=0.68 M and CH3CO2- =0.58 M, and has 0.01 M concentration of H2SO4 added to it? Ka of acetic acid is 1.8x10-5
Wednesday, November 11, 2015 by Randy

chemistry
The solubility of Na3(PO4) is 0.025 M. What is the Ksp of sodium phosphate?
Wednesday, November 11, 2015 by Randy

chemistry
What is the pH of a 0.5 M solution of NaHCO3? Kb = 2.4x10-8 (base)
Wednesday, November 11, 2015 by Randy

chemistry
what is the minimum frequency that will produce the photoelectric effect for rubidium(Rb)? (if it matters the frequency=5.2E24Hz or greater and I'm solving for the binding energy)
Wednesday, November 11, 2015 by Brooke N

chemistry
What is the wavelength, frequency, temperature, and type of the electromagnetic radiation that has: a. 90% the speed of light b. 50% the speed of light c. 10% the speed of light d. 5% the speed of light e. 1% the speed of light
Wednesday, November 11, 2015 by Brooke N

chemistry
The De Broglie wavelength of electrons used in an experiment utilizing an electron microscope is 96.00pm. what is the speed of one of these electrons? (De Broglie's equation is wavelength=6.63E-34 / (mass*velocity))
Wednesday, November 11, 2015 by Brooke N

Chemistry-Dr.Bob
Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 176.00 pm .
Wednesday, November 11, 2015 by Rucha

Chemistry
Why are the two words "alkaline" and "earth" used to name the group 2 metals?
Wednesday, November 11, 2015 by Sarah

chemistry or physics
What is the speed of light in scientific notation?
Wednesday, November 11, 2015 by Brooke N

chemistry
how can you test to see if a light with wavelength 413nm is the same light with a frequency of 6.26*10^14Hz?
Wednesday, November 11, 2015 by Brooke N

chemistry
Determine the number of photons: A certain photon detector receives a signal of total energy 4.05*10^18 Joules from radiation of wavelength 535.00nm. (The only equation I can think to use is E(energy)= 6.63*10^-34 * (C(speed of light) / wavelength, but after I solve for speed ...
Wednesday, November 11, 2015 by Brooke N

Chemistry
You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate with a 0.1105 M NaOH. If you add 20.00 mL of HCCOOH to the beaker before titrating, approximately what volume of NaOH will be required to reach the end point?
Wednesday, November 11, 2015 by Amber

Chemistry- Dr. Bob
Use Coulomb's law to calculate the ionization energy in kJ/mol of an atom composed of a proton and an electron separated by 176.00 pm .
Wednesday, November 11, 2015 by Rucha

top ville college
Chemistry What volume of carbon (iv) oxide at s.t.p is evolved when o.5moles of NaHCO3 is heated
Wednesday, November 11, 2015 by olamide

chemistry
1. Calcuate the distance(km) from the Earth to the Moon if it takes light 1.3 seconds to make the trip? 2. Saturn is about 1.2 billionkm from Earth. How long does it take light to travel that distance? (I was only given the wave equation, Max Plancks equation, De Broglies ...
Wednesday, November 11, 2015 by Brooke N

chemistry
Balance the following redox equation. hno2(aq) + h2so4(aq) + k2cr2o7(aq)= hno3(aq) + cr2(so4)3 + h20 + k2s04?
Wednesday, November 11, 2015 by muzo

chemistry
balance the following redox equation. hno2(aq) + h2so4(aq) + k2cr2o7(aq)= hno3(aq) + cr2(so4)3 + h20 + k2s04
Wednesday, November 11, 2015 by muzo

Chemistry- Dr. Bob
Why doesn't Rb react with N2?
Wednesday, November 11, 2015 by Anonymous

Organic Chemistry
A sample of carvone was found to be 39% optically pure in favor of the dextrorotatory enantiomer. The specific rotation for enantiomerically pure carvone is 61o. The polarimetry experiment that led to this result was performed utilizing a 2.5 dm polarimeter tube and a solution...
Wednesday, November 11, 2015 by polly

chemistry
how do you go about to find the grams that will react with 90g acetic acid
Wednesday, November 11, 2015 by neliswa

Chemistry
What volume of 18N H2SO4 is required to prepare 125 ml of 6.0 N H2SO4?
Wednesday, November 11, 2015 by Momo

chemistry
A viral preparation was inactivated in a chemical bath. The activation process was found to be first order in virus concentration. The beginning of the experiment 2% of the virus was found to be inactivated per minute. [i] Evaluate k for the inactivation process in units (1/s...
Wednesday, November 11, 2015 by Steven

Chemistry
To determine the calories of a food, the energy released is calculated based on the mass used in the calorimeter. If a 0.8 g nut is consumed in a bomb calorimeter and the resultant temperature change is 80.3 degrees C for 50 mL of water, what would be the energy in Calories ...
Tuesday, November 10, 2015 by Anonymous

Chemistry
Two electrolysis cells are set up in series so that the same current flows through each. In one compartment 5.40 g of Ag (molar mass = 108 g/mol) is deposited from a Ag+ solution. What mass of Cu (molar mass = 64 g/mol) is deposited simultaneously if the other cell contains ...
Tuesday, November 10, 2015 by Anonymous

Chemistry
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. Given the following data, Ethylbenzene, C6H5--CH2CH3 : delta Ht = -12.5 kJ/mol, delta Gt = 119.7 kJ/mol and S = 255 J/mol*K Styrene, C6H5--CH==CH2 : ...
Tuesday, November 10, 2015 by Judith

Chemistry
How do I find the number of moles of NaOH when given 2M and 50.0mL? Also with HCl?
Tuesday, November 10, 2015 by Anonymous

CHEMISTRY!!!!!!!!!!
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. Given the following data, Ethylbenzene, C6H5--CH2CH3 : delta Ht = -12.5 kJ/mol, delta Gt = 119.7 kJ/mol and S = 255 J/mol*K Styrene, C6H5--CH==CH2 : ...
Tuesday, November 10, 2015 by Judith

chemistry
find the percentage by mass of nitrogen present in (NH4)2SO4
Tuesday, November 10, 2015 by lucky

Chemistry
The molar mass of the reagent, Fe(NH4)2(SO4)2.6H2O is 392.14 g/mol. Now suppose the measured mass of Fe(NH4)2(SO4)2.6H2O during the practical was 0.0218 g and this was dissolved in 50ml of deionized water that contains 1 to 2ml of concentrated sulphuric acid and transfer ...
Tuesday, November 10, 2015 by Mara

Chemistry
Question Given the equation: 4 Fe(s) + 3 O2(g) ? 2 Fe2O3(s), what is the theoretical yield of Fe2O3 from the reaction of 4.86 g Fe with excess O2? b. If 6.76 g Fe2O3 are actually obtained from 4.86 g Fe, what is the percent yield? c. Under other conditions, the percent yield ...
Tuesday, November 10, 2015 by Kami

chemistry
Calculate the molar enthalpy change for this reaction: HCl(aq 1.00M) + NaOH -> NaCl(aq,.500M)+ H2O Initial temp: 22.15 degrees Celsius Extrapolated temp: 25.87 degrees Celsius DT: 3.72 degrees Celsius Notes: Calculate the enthalpy change for this reaction. The density of ....
Tuesday, November 10, 2015 by Failure

Chemistry
You calibrate 25ml pipette at 25degae centigrade using steel weight.the weight of the delivered volume of water is 24.971.what is the volume of pipette at 20 and 25 degree centigrade?
Tuesday, November 10, 2015 by Syed

Chemistry
Write the shorthand version of the electron configuration of an element that has eight electrons. I came up with the configuration as 1s^2-2s^2-2p^4, but how do I write the shorthand version of an element that has not been specified?
Tuesday, November 10, 2015 by Anonymous

chemistry
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. (a) Find ÄH°rxn, ÄG °rxn, and ÄS °rxn, given these data at 298 K: (b) At what temperature is the reaction spontaneous? What ...
Monday, November 9, 2015 by Dalton

Chemistry
Magnesia (MgO(s)) is used for fire brick, crucibles and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3(s)) into at around 1200oC Write a balanced equation for the magensite decomposition being sure to include states for the ...
Monday, November 9, 2015 by KYson

Chemistry
how much heat is required to warm 225 grams of water from -50c to 200 c
Monday, November 9, 2015 by Bob

Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)->2 NaNO3(aq)+CO2(g)+H20(l)
Monday, November 9, 2015 by Connor Smith

Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)->2 NaNO3(aq)+CO2(g)+H20(l)
Monday, November 9, 2015 by Connor Smith

Chemistry
What volume (in mL) of a 0.300 M HNO3 solution will completely react with 43.9 mL of a 0.146 M Na2CO3 solution according to this balanced chemical equation? Na2CO3(aq)+2 HNO3(aq)->2 NaNO3(aq)+CO2(g)+H20(l)
Monday, November 9, 2015 by Connor Smith

Chemistry
A sample of nitrogen is collected over water at 21 degrees Celsius at a pressure of 745 torr. What is the partial pressure, in torr, of the nitrogen?
Monday, November 9, 2015 by Failure

chemistry
Suppose 3.50g each of sulfamic acid and sodium nitrite were allowed to react together. What would be the theoretical yield, in moles, of N2. Equation: NaNO2 + NH3SO3 -> N2 + H2O + NaHSO4 Notes: The theoretical yield of N2 can be calculated from the amounts of starting ...
Monday, November 9, 2015 by Failure

CHEMISTRY - BATTERIES
What is the voltage and the Gibbs Free Energy for the following reaction? (Assume standard conditions) 3Sn^2+ (aq) + 2Al (s) --> 2 Al^3+ (aq) + 3 Sn (s) Now calculate the Gibbs Free Energy for the above reaction if Sn^2+ (aq) is 0.15 and Al^3+ (aq) is 1.8
Monday, November 9, 2015 by DAN

Chemistry
If 1.65 M sulfuric acid is being used, how many mL of sulfuric acid will it take to fully react with 1.50 g of aluminum hydroxide?
Monday, November 9, 2015 by Anonymous

chemistry
A 10L flask at 298K contains a gaseous mixture of CO AND CO2 at a total pressure of 4atm.if 0.20 mole OF CO is present ;find the partial pressure of CO and that of CO2
Monday, November 9, 2015 by Nanayaw

chemsitry dr Bob
Magnesia (MgO(s)) is used for fire brick, crucibles and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3(s)) into at around 1200oC Write a balanced equation for the magensite decomposition being sure to include states for the ...
Monday, November 9, 2015 by KYson

chemsitry dr Bob
Magnesia (MgO(s)) is used for fire brick, crucibles and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3(s)) into at around 1200oC Write a balanced equation for the magensite decomposition being sure to include states for the ...
Monday, November 9, 2015 by KYson

chemistry
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. (a) Find ÄH°rxn, ÄG °rxn, and ÄS °rxn, given these data at 298 K: (b) At what temperature is the reaction spontaneous? What ...
Monday, November 9, 2015 by Dalton

chemistry
the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -1....
Monday, November 9, 2015 by Juidith

CHEMISTRY
200.0 ml of 0.5000 M acetic acid is added to 200.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid at 25 oC is 1.76 x 10-5. n(NH3COOH)=CxV=0.5x200/1000=0.1mol n(Naoh)=CxV=0.5x200/1000=0.1mol I have no idear of what to do after finding the number of moles
Monday, November 9, 2015 by BAFANA

AP Chemistry
Hey guys! I have answers, but am confused. Please and thanks for any help! A) Which of the following is false? 1.A spontaneous change occurs by itself without assistance. 2.The greater the statistical probability of a state, the greater is its entropy. 3.A non-spontaneous ...
Monday, November 9, 2015 by Allie

Chemistry
How to I find the spectator ions of BaCl2+K2SO4->2KCl+BaSO4
Monday, November 9, 2015 by Sara

Chemistry
the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -1....
Monday, November 9, 2015 by Judith

Chemistry
1) A saturated solution of the slightly soluble salt MA3 is 1.4 ×10^–3 M in MA3. What is its Ksp value? 2) A 20.0 mL sample of NaIO3 was treated with an excess of KI and HCl and the iodine produced titrated with 0.05125 M Na2S2O3. 19.35 mL of Na2S2O3 solution were ...
Monday, November 9, 2015 by Brad

Organic Chemistry 2
What is the impurity that must be removed from the benzaldehyde reagent before it can be used in this experiment? this is from are Benzil lab
Monday, November 9, 2015 by John

Organic Chemistry 2
Compare the IR spectrum of benzoin ) with the IR spectrum of benzil . Explain how the changes in the important peaks are related to the differences between the two structures.
Monday, November 9, 2015 by John

Chemistry
Which of the following nitrogen-containing compounds would supply the most nitrogen per gram of fertilizer? a. iron azide, Fe(N3)2, MW = 140 g/mol b. sodium azide, NaN3, MW = 65 g/mol c. potassium nitrite, KNO2, MW = 85.1 g/mol d. potassium azide, KN3, MW = 81.1 g/mol e. There...
Monday, November 9, 2015 by Sarah

Chemistry
The thermal decomposition of carbonates leads to the loss of CO2. The decomposition of an unknown carbonate leads to a 35.1% weight loss. The unknown was which of the following compounds? A. Li2CO3 B. MgCO3 C. CaCO3 D. ZnCO3 E. BaCO3 How do I solve this?
Monday, November 9, 2015 by Anonymous

chemistry
the heat capacity of copper is 0.382J/g degrees celsius. a 22.6g sample of copper at 93 degrees celsius is placed in 50g of water at 23.9 degrees celsius. what is the final temperature of the system?
Monday, November 9, 2015 by zainab

chemistry
a metal sample having a temperature of 100 degrees Celsius and a mass of 45.2g was placed in 50g of water with a temperature of 26 degrees Celsius. at equilibrium, the final temperature was 32.7 degrees Celsius. a)how much heat flowed into the water? b)what is the heat ...
Monday, November 9, 2015 by zainab

chemistry
the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -1....
Monday, November 9, 2015 by Juidith

chemistry
Styrene is produced by catalytic dehydrogenation of ethyl- benzene at high temperature in the presence of superheated steam. (a) Find ÄH°rxn, ÄG °rxn, and ÄS °rxn, given these data at 298 K: (b) At what temperature is the reaction spontaneous? What ...
Monday, November 9, 2015 by Dalton

chemistry
Enter a chemical equation for the ionization in water of CH3CH2COOH. Is the acid strong or weak? Select the Lewis structure for the ion formed by the acid when it ionizes. Chemical equation: Note: Include physical states.
Monday, November 9, 2015 by y

Chemistry
the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -1....
Monday, November 9, 2015 by Judith

Chemistry
Magnesia (MgO(s)) is used for fire brick, crucibles and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3(s)) into at around 1200oC Write a balanced equation for the magensite decomposition being sure to include states for the ...
Monday, November 9, 2015 by Kyson

Organic Chemistry
How am I supposed to do these questions? I'm completely lost. A 0.120 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.12° in a 1-dm sample container. The molar mass of the compound is 130.0 g/mol. (b) What is the observed rotation...
Sunday, November 8, 2015 by Jeff

Organic Chemistry
What observed rotation is expected when a 1.44 M solution of (R)-2-butanol is mixed with an equal volume of a 0.720 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long? The specific rotation of (R)-2-butanol is –...
Sunday, November 8, 2015 by Mary

chemistry
Assume that 268mL of 5.00M NaOH are diluted to a final volume of 574mL with water. What is the final molarity of NaOH (FM=40.0).
Sunday, November 8, 2015 by Morgan

Chemistry (Check)
Ammonia can be produced in a two-step process. First, nitrogen reacts with red-hot magnesium to form magnesium nitride. Then magnesium nitride reacts with water to form magnesium hydroxide and ammonia. A. Write each balanced chemical reaction. B. How many grams of magnesium ...
Sunday, November 8, 2015 by Anonymous

Chemistry (Check)
Ammonia can be produced in a two-step process. First, nitrogen reacts with red-hot magnesium to form magnesium nitride. Then magnesium nitride reacts with water to form magnesium hydroxide and ammonia. A. Write each balanced chemical reaction. B. How many grams of magnesium ...
Sunday, November 8, 2015 by Anonymous

chemistry
Calculate ΔGo (in J) for 2 moles of electron(s) in each half-reaction and a standard potential of 0.44 V
Sunday, November 8, 2015 by moe

Chemistry
The thermal decomposition of carbonates leads to the loss of CO2. The decomposition of an unknown carbonate leads to a 35.1% weight loss. The unknown was which of the following compounds. A. Li2CO3 B. MgCO3 C. CaCO3 D. ZnCO3 E. BaCO3
Sunday, November 8, 2015 by Anonymous

chemistry
the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose is broken down into Co2 and H2o. Calculate delta g for respiration of 1.00 g of glucose Calculate delta g for fermentation of 1.00 g of glucose. My answers: -16.0 kJ and -1....
Sunday, November 8, 2015 by Judith

Chemistry
Calculate the molarity of a solution prepared by dissolving 10.0 grams of NaOH and then diluting the solution to 500mL.
Sunday, November 8, 2015 by Anonymous

chemistry
Suppose that 2.69 mol of hydrogen gas occupies a 64.6 L steel tank. At what temperature in °C will the pressure in the tank be 1,383 torr?
Sunday, November 8, 2015 by heri

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