Friday
May 27, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T = ...
Friday, March 11, 2016 by Student

Chemistry
A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...
Friday, March 11, 2016 by Student

Chemistry- DrBob222
Please check. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and ...
Friday, March 11, 2016 by Student

chemistry
At 25 °C, the density of a 60.0% (m/m) solution of sucrose, C12H22O11, in water is 1.29 g/mL. What is the molarity of this solution?
Friday, March 11, 2016 by Anonymous

Inorganic Chemistry
In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....
Friday, March 11, 2016 by Michael

chemistry
calculate the mass of chlorine gas contained in a 5dm3 flask at 25degrees celsuis and 98kpa pressure.
Friday, March 11, 2016 by sopuruchi

Inorganic Chemistry
In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....
Friday, March 11, 2016 by Michael

Inorganic Chemistry
A researcher studying the nutritional value of a new candy places a 4.70-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.98 °C. If the heat capacity of the calorimeter is 39.80 kJ·K–1, ...
Friday, March 11, 2016 by Michael

Chemistry
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
Thursday, March 10, 2016 by Student

chemistry
Mg+2Hcl---mgcl2+h2 volume of h2=40ml Hcl is 6M what mass os h is obtained by addin excess hcl to 6m of magnesium
Thursday, March 10, 2016 by suni bohr

Chemistry- Dr.Bob222
Predict the effect of decreasing the temperature on the position of the following equilibria. (a) H2(g) + Cl2(g) ↔ 2HCl(g) + 49.7 kJ My answer: shifts to the right (b) 2NH3(g) ↔ N2(g) + 3H2(g) ∆ H = 37.2 kJ My answer: shifts to the left (c) CO(g) + H2O(g) &#...
Thursday, March 10, 2016 by Nevaeh

Chemistry
Diethyl ether (also known as “ether”), C4H10O (l), is an organic compound that has long been used as a surgical anesthetic. The complete combustion of 1 mol of C4H10O (l) to CO2 (g) and H2O (l) yields ΔH °=-2723.7 kJ. a) Write a balanced equation for the ...
Thursday, March 10, 2016 by Feufolia

Chemistry
A student collected concentration data to determine the rate of the decomposition of N2O5 to NO2 and O2. The data were recorded in the table below. What is the rate law of this reaction? k[N2O5] k[N2O5]2 k k[NO2]
Thursday, March 10, 2016 by Steph

chemistry
my developing solvent is hexane toluene acetic acid(5:5:1)nd my samples rf nd impurity rf is very close,my spots r not separating properly,so which hexane should hav to be used?n hexane or hexane fraction?is only hexane affect or other factor is there?
Thursday, March 10, 2016 by aparna

math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry?
Thursday, March 10, 2016 by james

chemistry
calculate the pH of a 0.100M NH4Cl solution.
Thursday, March 10, 2016 by amy

Chemistry
If I was designing an experiment where hydrogen gas was collected over a 0.1 M aqueous HCl solution from the reaction with zinc metal and I assume complete, rapid reaction, what mass of zinc would be used to collect between 50 and 100 mL of the gas? Note: I calculated using ...
Wednesday, March 9, 2016 by Student

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
Wednesday, March 9, 2016 by jane

chemistry
how many grams of Zn metal would you use to prepare 6.8g of zinc chloride according the reaction: Zn(s)+2HCl(aq)-> ZnCl2(aq)+H2(g)
Wednesday, March 9, 2016 by jane

Intro to Chemistry
A 9.40-L container holds a mixture of two gases at 47 °C. The partial pressures of gas A and gas B, respectively, are 0.344 atm and 0.520 atm. If 0.160 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
Wednesday, March 9, 2016 by Richard

Science chemistry
An excces of sulfur dioxide was reacted with 0.150 g of oxigen gas. A mass of 0.725 g of sulfur trioxide was recovered
Wednesday, March 9, 2016 by Mss.unknown

chemistry
The voltage of an electrochemical cell depends on the redox reaction occurring in the cell. Given a redox reaction below: Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) Pb2+(aq) + 2 e--->Pb(s)Eº = -0.13V Zn2+(aq) + 2 e--->Zn(s)Eº = -0.76V Calculate the E.M.F (Voltage...
Wednesday, March 9, 2016 by bliss

chemistry
Given the equation below, if 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced? Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)
Wednesday, March 9, 2016 by bliss

chemistry
What is the concentration oh hydrogen ions in a solution containing .676 M HOCN and .413 M NaOCN? The ionization constant of cyanic acid is 3.5 x 10^-4. Answer in units of M.
Wednesday, March 9, 2016 by Juicy

Chemistry
Calculate the weight % of HOAc in pure Vinegar?
Wednesday, March 9, 2016 by Rich

Chemistry
The Li2+ ion is hydrogenic and has a Lyman series at 740747 cm-1, 877924 cm-1, 925933 cm-1,and beyond. Show that the energy levels are of the form –hcR/n^2 and find the value of R for this ion. Go on and predict the wavenumbers of the two longest wavelength transitions of...
Wednesday, March 9, 2016 by Joesph

Chemistry
Calculate the mass of the deuteron given that the first line in the Lyman series of H lies at 82259.08 cm-1 whereas that of D lies at 82281.476 cm-1. Calculate the ratio of ionization energies of H and D.
Wednesday, March 9, 2016 by Joesph

chemistry
What mass of K2HPO4 must be added to 1 L of .1 M K3PO4 to prepare a buffer solution with a pH of 10.8? Answer in units of grams.
Wednesday, March 9, 2016 by Avery

Chemistry
What chemical occurs to the red cabbage red for acids and blue for bases.
Wednesday, March 9, 2016 by jason

chemistry
a chemist dissolves kcl in water at constant temperature until no more kcl dissolves, how would you most accurately classify this solution, dilute, saturated, unsaturated or supersaturated?
Wednesday, March 9, 2016 by sidney betzler

chemistry
Given the following Unknown atoms with their respective atomic numbers, X; Atomic number 19, Y; Atomic number 15, a. Deduce the identities of the elements X and Y. b. What are the mass numbers of the two elements X and Y? c. Calculate the number of Neutrons in the respective ...
Wednesday, March 9, 2016 by bliss

chemistry
Given the equation below, if 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced? Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)
Wednesday, March 9, 2016 by bliss

chemistry
6. Given the equation below, how many moles of each reactant were there if 13.7 moles of N2(g) is produced? 4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g)
Wednesday, March 9, 2016 by bliss

chemistry
3. For the reaction between Cu and Sn the potentials are given below; Cu2+(aq) +2e- -----------> Cu(s) Eºcathode = 0.34 (half-cell potential) Sn(s) -----------> Sn2+(aq) + 2 e- Eºanode = - 0.14 (half-cell potential) Calculate the E.M.F (Voltage) of the cell ...
Wednesday, March 9, 2016 by bliss

chemistry
3. For the reaction between Cu and Sn the potentials are given below; Cu2+(aq) +2e- -----------> Cu(s) Eºcathode = 0.34 (half-cell potential) Sn(s) -----------> Sn2+(aq) + 2 e- Eºanode = - 0.14 (half-cell potential)
Wednesday, March 9, 2016 by bliss

chemistry
2. The voltage of an electrochemical cell depends on the redox reaction occurring in the cell. Given a redox reaction below: Zn(s) + Pb2+(aq) --> Zn2+(aq) + Pb(s) Pb2+(aq) + 2 e--->Pb(s)Eº = -0.13V Zn2+(aq) + 2 e--->Zn(s)Eº = -0.76V Calculate the E.M.F (...
Wednesday, March 9, 2016 by bliss

chemistry
1. Given that 50 grams of ice is heated at -20.0 °C to steam at 135.0 °C. i. Show the graph of the changes from ice to steam ii. Calculate the energy needed to change the ice to steam Please use these values: Heat of fusion = 334.16 J g¯1 Heat of vaporization = ...
Wednesday, March 9, 2016 by bliss

chemistry
Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Wednesday, March 9, 2016 by james

Chemistry
how many atoms are there in 1.13 liters of hydrogen peroxide H2O2?
Wednesday, March 9, 2016 by Senni

Chemistry
I need help with this problem Which acid of those is used to destinguish between FeO and Fe2O3 a-HCl conc. b-HCl dil. C-H2SO4 conc. And how
Wednesday, March 9, 2016 by Asmaa khalaf

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Wednesday, March 9, 2016 by Anonymous

Organic chemistry
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...
Wednesday, March 9, 2016 by Laura

Chemistry
If only 1.31 grams of water are actually produced in the lab, what is the percent yield?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Elemental sulfur occurs as octatomic molecules, S8. What mass of fluorine gas is needed for complete reaction with 24.1 g sulfur to form sulfur hexafluoride? I don't know where to even start with this question
Tuesday, March 8, 2016 by Ashley

Chemistry
What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-
Tuesday, March 8, 2016 by Student

Chemistry
A 100.00 ml of volume of 0.500 M HCl was mixed with 100.00 ml of 0.500 M KOH in a constant pressure calorimeter. The initial temperature of individual acid and base was 23.0 degree celsius. The final temperature after mixing was 25.5 degree celsius Given the specific heat of ...
Tuesday, March 8, 2016 by Payton

Chemistry-DrBob222
A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...
Tuesday, March 8, 2016 by Student

Chemistry
Highest ionization energy to lowest I be ci f
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Calculate the volume (in mL) of 0.627 M HNO3 needed to react completely with 8.12 g of BaCO3 in a gas-forming reaction
Tuesday, March 8, 2016 by Pat

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry
Balancing Equations Sucrose(C12H22O11) and oxygen produce a solid carbon, water and 3 units of carbon dioxide.
Tuesday, March 8, 2016 by Anonymous

Chemistry
Sucrose(C12H22O11) and oxygen produce a solid carbon, water and 3 units of carbon dioxide
Tuesday, March 8, 2016 by Jasmeen

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
Calculate the molarity of 3 drops (0.15mL) of a 0.5M Na3PO4 solution after adding 15 drops (.75mL) of water. (Presume drops are the same size, one drop = 0.05mL)((Presume volumes are additive)) So far I've figured .15g Na3PO4/163.94g/mol Na3PO4 = .0009moles .75g H20/18.015...
Tuesday, March 8, 2016 by Kevin

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry-DrBob222
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
Tuesday, March 8, 2016 by Student

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
Tuesday, March 8, 2016 by Student

Chemistry
Calculate the total heat required to vaporize 1.5 kg of water at 100oC to water vapor at 100oC?
Tuesday, March 8, 2016 by en1405

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
Tuesday, March 8, 2016 by Student

Chemistry
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
Tuesday, March 8, 2016 by Student

Chemistry
Calculate the molarity of a solution which contains 0.40 mol of a substance dissolved in 1.6 L of a solution.
Tuesday, March 8, 2016 by Jasmine

chemistry
The mass of cao that can be prepared by heating 200g of caco3 which is 95 percent pure is
Tuesday, March 8, 2016 by sreeja

Chemistry
When solutions of two reactants were mixed in a coffee-cup calorimeter, the following temperatures were recorded as a function of time. Plot the data on one of the available pieces of graph paper. Obtain tf, the final temperature, by extrapolating to the time of mixing (time...
Tuesday, March 8, 2016 by Destany

Chemistry
Concentrated hydrochloric acid is 12 M. What is the molarity of an HCl solution prepared by diluting 10.0mL of concentrated acid to a total volume of 250.0mL?
Tuesday, March 8, 2016 by Sam

Chemistry
What is the maximum kinetic energy of an ejected electron if silver metal is irradiated with 228-nm light? The threshold wavelength for a silver metal surface is 267 nm.
Tuesday, March 8, 2016 by Anonymous

Chemistry
What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1?
Tuesday, March 8, 2016 by Anonymous

Chemistry
How much concentrated 12 M HCl is needed to prepare 200 ml of a 2.5 M solution?
Monday, March 7, 2016 by Sam

chemistry
at some temperature, Keq=33 for the reaction H2 + I2 -> 2HI. If initially, [H2]= .0600 M and [I2]= .0300 M, what are all three equilibrium concentrations?
Monday, March 7, 2016 by seth

Chemistry
explain on a particle basis how the addition of a solute affects the boiling point, the freezing point, and the vapor pressure of the solvent.
Monday, March 7, 2016 by bubble dragon

chemistry
The ionization constant of HA is 1 × 10−6 . What must be the ratio of [A−] to [HA] for the preparation of a buffer solution with a pH of 6.49?
Monday, March 7, 2016 by Avery

Chemistry
A buffer is prepared by mixing 20 mL of .10 HOCl with 20 mL of .05 M NaOCl, and measure the pH to be 7.15. Using this information calculate the Ka for HOCl
Monday, March 7, 2016 by Avery

Chemistry
Classify the following type of stoichiometry problem: How many grams of zinc must react with an excess volume of hydrochloric acid to yield 0.500 g of zinc chloride? mass-mass problem mass-volume problem volume-volume problem mole-mole problem none of the above
Monday, March 7, 2016 by Jacquie

Chemistry
So if i have the equation 2 SO3 --> 2S + 3 O2 would my word equation for this be Sulfur Oxide --> Sulfur + Oxygen OR Sulfur hexaoxide --> Sulfur + hexaoxide or what would be the correct one if both are wrong? and for this one 2 KI + MgCI2 --> MgI2 + 2KCL Potassium ...
Monday, March 7, 2016 by Holfbrincl

Chemistry
why does the FeCl3 test positive for phenols and not other -OH compounds?
Monday, March 7, 2016 by Amber

Chemistry
A 10.0-g sample of solid NH4Cl is heated in a 5.00-L container to 900.°C. At equilibrium the pressure of NH3(g) is 1.51 atm. NH4Cl(s) mc011-1.jpg NH3(g) + HCl(g) The equilibrium constant, Kp, for the reaction is:
Monday, March 7, 2016 by Clare

Chemistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
Monday, March 7, 2016 by Student

11th chemistry
The chlorination of ethane gives a compound with the percent composition by mass of chlorine in the compound is 71.7% A) find the molecular formula of this compound B) write the condensed structural formulas of the isomers of this compound and give their names C) one of the ...
Monday, March 7, 2016 by angy

Chemistry
when a certain amount of calcium chloride (CaCl2) was dissolved 100.g of water, the boiling point rose from 100.0*C to 104.4*C; calculate the molality of this solution.
Monday, March 7, 2016 by James Dickenson

Chemistry
What is the mass of Na in 20g of Na2Co3
Monday, March 7, 2016 by Jenny

CHEMISTRY HELP
assume that 13.5g of AL react with excess HCl according to the following balanced equation, at STP: 2Al(s) + 6HCl(aq) ---> 2AlCl3 + 3H2(g) how mang liters of H2 at STP are produced?
Sunday, March 6, 2016 by Joe

Chemistry
Would glass, plastic or cardboard be best to store milk so the lactic acid doesn't increase?
Sunday, March 6, 2016 by Jen

Chemistry
1). Calculate the initial and final pH when 5.0, 10.0, and 100mL of 0.100M HCL is added to (a) 100mL of water (b) 100mL of a buffer which is 1.50M acetic acid and 1.20M sodium acetate 2). Develop a recipe for making this buffer from acetic acid, sodium hydroxide, and water
Sunday, March 6, 2016 by Nate

Chemistry
Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step. If a mixture of solid nickel(II) oxide and 0.10000 M carbon ...
Sunday, March 6, 2016 by Nevaeh

Chemistry
Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step..
Sunday, March 6, 2016 by Nevaeh

Chemistry
Name each compound by ionic, hydrogen, or molecular compound. And name the following? 1- P2O3 2 - MnO2 3 - Al2S3 4 - SO3 5 - NH3 6- SrI2 7 - CL2O5 8 - FeCl2 9 - BeH2
Sunday, March 6, 2016 by Julie

Chemistry
A flask of hydrogen gas is collected at 1.023 atm and 35 degrees C by displacement of water at 35 degrees C is 42.2 mm Hg. What is the partial pressure of hydrogen gas in the flask? Not exactly sure where to start with this question, or what formula to use. Thanks in advance
Sunday, March 6, 2016 by Ben

Chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.11 M C2H3O2-. What is the pH of the resulting solution? I understand to use the ice method, however, i do understand what to plug into the hh equation.
Sunday, March 6, 2016 by Lil

Chemistry
Organic nhi aati smjh... Koi smjhado na
Sunday, March 6, 2016 by Avril

Chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.11 M C2H3O2-. What is the pH of the resulting solution? I understand to use the ice calculations. I dont understand what to plug into the hh equation.
Sunday, March 6, 2016 by lil

chemistry
how many grams of NaOH are needed to neutralize 50 grams of H2SO4?
Sunday, March 6, 2016 by kumera

chemistry
what is the balanced chemical equation for "solid calcium hydrogen carbonate reacts with hydrochloric acid solution producing carbon dioxide,water and calcium ions solution"?
Sunday, March 6, 2016 by Anabeth

chemistry
Calculate the value of the thermodynamic equilibrium constant for the following reactions at 25.0 °C. (a) N2H4(g) + 2O2(g) 2NO(g) + 2H2O(g) Kp = H20=-228.6 NO= 86.69 N2H4= 159.3 02 = 0
Saturday, March 5, 2016 by Lia

chemistry
At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.
Saturday, March 5, 2016 by Ann

chemistry
Dr Bob, Thanks for your help. Ihad googled for 3 hours before asking you. For future reference, if anyone asks this question again, 10th grade chemistry, I found a video on You Tube that makes it easy to understand. It is, The Sci Guys, Ph indicator, acid-base indicator. ...
Saturday, March 5, 2016 by lulu

ANALYTICAL CHEMISTRY
A sample weighing 1.25 mg containing a certain compound M (FW 292.16 g/mol) was dissolved in solvent in a 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.00 mL volumetric and diluted to the mark with solvent. The absorbance of this solution at 340 nm ...
Saturday, March 5, 2016 by KAMBOYI K

chemistry
Calcium carbonate, CaCO3, when heated decomposes to calcium oxide and carbon dioxide. Calculate the mass of calcium oxide formed when 2.0 grams of CaCO3 is decomposed.
Saturday, March 5, 2016 by Unknown

chemistry
In the red cabbage lab, we just took the cabbage juice and in 5 separate cups mixed it with 5 different liquids, ex: coke, milk, cleaning agent, etc, and matched the color to a ph chart to tell if it was a base or an acid. Simple lab. The question needs a relatively simple ...
Saturday, March 5, 2016 by lulu

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