Monday
June 27, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
What is the standard cell potential of a cell made of theoretical metals Ms/Ma^+2 and Mb/Mb^+2 if the reduction potentials are -0.19V and -0.85 V, respectively? +0.66V -0.66V +1.04 V*** -1.04V
Wednesday, June 1, 2016 by Kristin

Chemistry
What symbol is used to show the standard reduction potential of an oxidation reaction in a half cell? The sub means what follows is a subscript So the 0 is a superscript and the sub is its subscript E^0 sub cell*** E^0 sub red E^0 sub oxid All of the above
Wednesday, June 1, 2016 by Kristin

Chemistry
To charge a lead storage battery you must apply a direct current to it. hold a magnet close to it. force alternating current through it.*** increase the pressure on it.
Wednesday, June 1, 2016 by Kristin

Chemistry
The volume of a gas is increased from 100mL to 250 mL by heating it.If the original temperture of the gas was 15.0°c what will be the final temperture in °c
Tuesday, May 31, 2016 by Mayra

Chemistry
Magnesium chloride hexahydrate has a density of 1.69 g/cm3. What is the volume in liters of 1.5 x10^2 pounds of MgCl2*6H2O? yes D=m/v into V=m/d, Do I need to find the formula mass of Magnesium chloride hexahydrate and change pounds into liters? Divide the found numbers and I ...
Tuesday, May 31, 2016 by Kim

Chemistry
In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative? Cu^+2 Cu(s) Zn(s)*** Zn^+2
Tuesday, May 31, 2016 by Samuel

Chemistry
What is the oxidation half reaction for the following equation: Cr2O7^-2 +Fe+2 - - > Cr^+3 + Fe^+3 Cr^+3 - - > Cr2O7^-2 Fe^+2 - - > Fe^+3 Fe^+3 - - > Fe^+2 Cr2O7^-2 - -> Cr^+3***
Tuesday, May 31, 2016 by Samuel

Chemistry
What is the reducing agent in the following reaction? 2K + S - - > K2S K*** S K2S None of these
Tuesday, May 31, 2016 by Samuel

chemistry
Some physical properties of water are shown below: melting point 0.0°C boiling point 100.0°C specific heat solid 2.05 J/g·°C specfic heat liquid 4.184 J/g·°C specific heat gas 2.02 J/g·°C ΔH° fusion 6.02 kJ/mol ΔH° ...
Tuesday, May 31, 2016 by Selena

Chemistry
How many moles of silver will be deposited from a silver (i) trioxonitrate (v) solution by 16.0g of copper (Ag=108,Cu=63.5)
Tuesday, May 31, 2016 by Gift

Chemistry
find the concentration of h3o in a .86mol/l solution of the weak acid H2O2 (kA=2.4x10-12)
Tuesday, May 31, 2016 by Buck

Chemistry
Find the concentrations of all species in a 0.10mol/l solution of NaOH
Tuesday, May 31, 2016 by Buck

Chemistry- Dr.Bob222
Using the Nernst equation, determine the diluted concentration for both cells. Show your work. Sn| Sn2+(diluted)||Cu2+|Cu Zn| Zn2+ ||Sn2+(diluted)|Sn
Monday, May 30, 2016 by Anonymous

Chemistry!!! PLZ PLZ HELP!!
Calculate the equilibrium amounts of each susbtance in the reaction below if an initial amount of 0.1 moles of H2 are brought together with an initial amount of 0.2 moles of I2 and then equilibrium is established at 900K. Kc at this temperature=70. H2 + I2 <-> 2HI
Monday, May 30, 2016 by Sabrina

Chemistry
A 25.0-g sample of sodium hydroxide is dissolved in 400.mL of water. What is the concentration of the solution?
Monday, May 30, 2016 by Mayra

chemistry
What particle is needed to complete this equation 14/7N+ _______=14/7C+ 1/1H I think it is a beta particle because of beta decay and transmutation. I could be really off because this chapter is really confusing me.
Monday, May 30, 2016 by lulu

Chemistry- Dr.Bob222
Which metal could you use to reduce Cr3+ ions but not Mn2+ ions? Which metal could you use to reduce ions but not ions? Zn Mg Ni Al
Monday, May 30, 2016 by Anonymous

Chemistry
Write short note on sigma bond and pi bond
Monday, May 30, 2016 by Anonymous

Chemistry
Write on the physical properties of benzene
Monday, May 30, 2016 by Anonymous

Chemistry
Using benzene as an example to illustrate substitution reaction
Monday, May 30, 2016 by Anonymous

Chemistry
Define indicators giving four examples and their PH ranges
Monday, May 30, 2016 by Anonymous

Chemistry
Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. Using silica gel plates, which of the two compounds will have the higher Rf value when ethyl acetate is the developing solvent? Which will have the higher Rf value when dichloromethane is the ...
Monday, May 30, 2016 by Anon

chemistry
the ph of the resulting solution when 1.15g of sodium metal is reacted slowly in 500cm3 of water is close to
Monday, May 30, 2016 by durshetti balaji

chemistry
A) what is the molar fraction of each gas in a mixture of 6g of hydrogen H2 and 7g of nitrogen N2 ? B) what is the total pressurd exerted by the above mixture in a volume of 15 l at a temperature of 0ºc ? C) what is the partial pressure of each gas in the above mixture? R...
Monday, May 30, 2016 by angy

Chemistry
Which amount of heat is released when 75.0 g of water at 0° C is frozen to ice?
Sunday, May 29, 2016 by G

Chemistry
A flexible plastic container contains 0.833 g of helium gas in a volume of 18.3 L. If 0.203 g of helium is removed at constant pressure and temperature, what will be the new volume?
Sunday, May 29, 2016 by Anonymous

chemistry
If I have a sample from doing a half lfe lab with m&ms, not timed, just pulling out decayed or m&ms with rhe m on top, how do I calculate the half life using t1/2=(.693)/k formula. Do I have to do this 9 times as it took 9 trys to use up all the m&ms. I am not really sure what...
Sunday, May 29, 2016 by lulu

Chemistry
A flexible plastic container contains 0.833 g of helium gas in a volume of 18.3 L. If 0.203 g of helium is removed at constant pressure and temperature, what will be the new volume?
Sunday, May 29, 2016 by Anonymous

Chemistry
Consider a 500mL solution containing 2.0×10^-5 mol HCl ·what is the pH of the above solution? ·If the solution is diluted to 1.5 L what will be the new pH?
Sunday, May 29, 2016 by Mayra

Chemistry
A sample of oxalic acid (H2C2O4, with two acidic protons), of volume 37.09 mL was titrated to the stoichiometric point with 22.41 mL of 0.163 M NaOH(aq). What is the molarity of the oxalic acid? Answer in units of M.
Sunday, May 29, 2016 by Andrea

Chemistry
A sample of sodium hydroxide of volume 11 mL was titrated to the stoichiometric point with 24.5 mL of 0.138 M HCl(aq). What is the initial molarity of NaOH in the solution? Answer in units of M.
Sunday, May 29, 2016 by Andrea

Chemistry
If the reaction 2H2O2 →2H2O+O2 has a 45% yield, what is the molarity of the H2O2 solution if 2.5 L of this solution pro- duces 150 g of O2?
Sunday, May 29, 2016 by Andrea

Chemistry
Suppose that 12.41 mL of 0.169 M NaOH(aq) was required to titrate 0.1579 g of an unknown acid (HX). What is the molar mass of the acid? Answer in units of g/mol.
Sunday, May 29, 2016 by Andrea

Chemistry
1. A sample of oxalic acid (H2C2O4, with two acidic protons), of volume 46.56 mL was titrated to the stoichiometric point with 17.06 mL of 0.297 M NaOH(aq). What is the molarity of the oxalic acid? Answer in units of M. 2. What mass of the oxalic acid was in the sample of the ...
Sunday, May 29, 2016 by Angelica

Chemistry
A compound has an empirical formula of CH2 and molecular mass of 84g. What is it's molecular formula?
Sunday, May 29, 2016 by Mayra

Chemistry
How many moles of a gas are present in 2.0L cylinder at 1.50 atmospheres and 17 degree's celcius?
Sunday, May 29, 2016 by Mayra

Chemistry
Write the formation equation for the ester that forms between propanoic acid and 1-pentanol. Include the names of the products and the structures for all substances involved.
Sunday, May 29, 2016 by Lily

chemistry
Suppose that 9.6 mL of 1.5 M KOH(aq) is transferred to a 250 mL volumetric flask and diluted to the mark. It was found that 31.5 mL of this diluted solution solution was needed to reach the stoichiometric point in a titration of 9.6 mL of a phosphoric acid solution according ...
Sunday, May 29, 2016 by jess

chemistry
QUESTION 4 Data Set 3: 47.65 mL of a standard 0.1000 mol L–1 HCl solution is used to titrate a 0.3827 g sample containing NaOH and other impurities. None of the impurities reacted with the HCl. What is the mass of NaOH in the sample? a. 0.1737 g b. 0.2103 g c. 0.1906 g d...
Sunday, May 29, 2016 by jess

Chemistry- Dr.Bob222
Using the Nernst equation, determine the diluted concentration for both cells. Show your work. Given that [Cu2+] and [Zn2+] are both 2M. Note: I know that the nernst equation is E= E*cell=(-0.0592 V/n)log Q where Q in this case are [Sn2+]/[Cu2+] and [Zn2+]/[Sn2+]. I think that...
Saturday, May 28, 2016 by Anonymous

Chemistry
What is the pH of a 0.05 M solution of acetic acid knowing that it was 2% ionized
Saturday, May 28, 2016 by Sidney

Chemistry- Dr.Bob222
Using the Nernst equation, determine the diluted concentration for both cells. Show your work. Given that [Cu2+] and [Zn2+] are both 2M. Note: I know that the nernst equation is E= E*cell=(-0.0592 V/n)log Q where Q in this case are [Sn2+]/[Cu2+] and [Zn2+]/[Sn2+]. I think that...
Saturday, May 28, 2016 by Anonymous

chemistry
the mole fraction of h2 in a mixture of h2 and ch4 is same as the mole fraction of c2h6in a mixture of c2h6 and c3h8 containing equal weight of c2h6 and c3h8 calculate mole fraction of ch4 in the mixture of h2 and Ch4
Saturday, May 28, 2016 by aakarshan

Chemistry
Calculate the pH of a solution prepared by dissolving 10.0 g of tris(hydroxymethyl)aminomethane ("tris base") plus 10.0 g of tris hydrochloride in 0.250 L of water. (a) What will be the pH if 10.5 mL of 0.500 M NaOH is added?
Saturday, May 28, 2016 by Sidney

chemistry
QUESTION 11 Information Set 1: Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. What is the molar solubility of chromium (III) iodate at 25°C? a. 8.4 x 10–2 mol L–1 b. 2.2 x 10–3 ...
Friday, May 27, 2016 by jess

Chemistry
Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. What is the molar solubility of chromium (III) iodate at 25°C? a. 8.4 x 10–2 mol L–1 b. 2.2 x 10–3 mol L–1 c. 6.3 x 10–...
Friday, May 27, 2016 by jess

Chemistry
Choose an alkane that is 6 to 10 carbon atoms in length. List the alkane's name and the other isomers you can properly draw and name. For example: Decane / isomer 2 methyl-Nonane. Do not guess. Draw out on paper then name for best results. Include the drawing of the alkane...
Friday, May 27, 2016 by Anonymous

Chemistry
The molar solubility of silver iodide in a 0.186 M potassium iodide solution is __________ M.
Friday, May 27, 2016 by Kat

Chemistry
Write a balanced net ionic equation to show why the solubility of Ca(OH)2(s) increases in the presence of a strong acid and calculate the equilibrium constant for the reaction of this sparingly soluble salt with acid.
Friday, May 27, 2016 by Kat

Chemistry
The mass of lead bromide that is dissolved in 250 mL of a saturated solution is____ grams.
Friday, May 27, 2016 by Kat

Chemistry
The solubility of Mg(OH)2 is measured and found to be 9.25×10-3 g/L. Use this information to calculate a Ksp value for magnesium hydroxide
Friday, May 27, 2016 by Kat

Chemistry
“How fast do hummingbirds fly?” Why is the question a scientific question?
Friday, May 27, 2016 by Deon

chemistry
Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. What is the molar solubility of chromium (III) iodate at 25°C? a. 8.4 x 10–2 mol L–1 b. 2.2 x 10–3 mol L–1 c. 6.3 x 10–2...
Friday, May 27, 2016 by jess

chemistry
A buffer is prepared consisting of 0.75 mol of sodium dihydrogenphosphate, NaH2PO4, and 0.60 mol of sodium hydrogenphosphate, Na2HPO4, dissolved in 600.0 mL of water. The Ka for the dihydrogenphosphate ion is 6.2 x 10–8 at 25°C. Which of the following is another ...
Friday, May 27, 2016 by jess

chemistry
Calculate the volume of the ammoniacgas formed when nitrogen reacts with 6 litres of hydrogen
Friday, May 27, 2016 by divya

Chemistry
Complete the following equations: A) methyl butanone + oxygen ---> B) a pentagon + F2 ----->
Thursday, May 26, 2016 by Rose

Chemistry
What would the reaction of these two look like (reactants and products) A) hexanal is reduced B) Butanoic acid is neutralized by potassium hydroxide
Thursday, May 26, 2016 by Rose

Chemistry Help Please!
1) You are going to make 1800ml of a 25uM solution using a compound whose MW= 60.06 Daltons. How many grams do you need of this compound? Give your answer with four decimal places. 2) You are going to make 300ml of a 75mM solution using a compound whose MW=818 g/mole. How many...
Thursday, May 26, 2016 by Tenshi

Chemistry
If Ka for HNO2,=4.5x10-4, find the [H+] a 0.9 M HNO2 solution.
Thursday, May 26, 2016 by Kathy

Chemistry
In a hydrogen- oxygen fuel cell hydrogen diffuses through the cathode. hydrogen and oxygen are mixed before entering the anode.*** oxygen diffuses through the anode. oxygen diffuses through the cathode.
Thursday, May 26, 2016 by Katie

Chemistry
To charge a lead storage battery you must apply a direct current to it. hold a magnet close to it.*** force alternating current through it. increase the pressure on it.
Thursday, May 26, 2016 by Katie

General Chemistry
A 1/5 mmol (yes, millimol... no, it isn't a typo_ sample of XeFn h as a mass of 0.311 g. What is the value of n? The answer is 4, but why?
Thursday, May 26, 2016 by Kayla

chemistry
How to calculate number of electrones in 18 ml of water givan that density of water is 1g/cc
Thursday, May 26, 2016 by anu mol

chemistry
How many grams of CO2 are evolved on heating 200 g of CaCO3.
Thursday, May 26, 2016 by anu mol

Chemistry
Why must not the condensed water drip into the flask?
Wednesday, May 25, 2016 by Vaisamoa Tokauea

Chemistry
When it comes to something being spontaneous, what does it mean? I know its something that goes out without no outside force or something like that but what are example of something that is spontaneous ?
Wednesday, May 25, 2016 by Kat

Chemistry
What is the change in enthalpy of the following reaction? 2NaBr(aq) + PbCl2(aq) 2NaCl(aq) + PbBr2(aq) Given: NaCl: ∆H = -411 kJ NaBr: ∆H = -360 kJ PbCl2: ∆H = -359 kJ PbBr2: ∆H = -277 kJ Im lost with this. Everytime I try to do it, it doesn't come ...
Wednesday, May 25, 2016 by Kat

Chemistry
Balance the following redox equation using the oxidation number change method. Describe each step that is involved: Al(s) + PbSO4 - - > Al2(SO4)3 + Pb(s)
Wednesday, May 25, 2016 by Genna

Chemistry
In the most common dry cell what material is the electrode that is the center rod made of? copper graphite iron*** zinc
Wednesday, May 25, 2016 by Genna

Chemistry
What assures that there is no charge build up in a voltaic cell as oxidation and reduction occur? one of the half cells the electrolyte solutions*** the moving electrons the salt bridge
Wednesday, May 25, 2016 by Genna

Chemistry
aluminum hydroxide is decomposed to form aluminum oxide and water. if 2.23 moles of water are formed then how many of aluminum oxide are formed. how many grams of aluminum hydroxide must have been.decomposed?
Wednesday, May 25, 2016 by Alisha

Chemistry
The bond angle of water is decreased from 109Degree 28' to 104Degree 24',why?
Wednesday, May 25, 2016 by Pappu kumar sah

Chemistry
In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative Cu^+2 Cu(s) Zn(s) Zn^+2***
Wednesday, May 25, 2016 by Lara

Chemistry
Of the following metals, which ions are most easily reduced? aluminum*** iron mercury potassium
Wednesday, May 25, 2016 by Lara

Chemistry
Which atom has a change in oxidation number of –3 in the following redox reaction? K2Cr2O7 + H2O + S - - > KOH + Cr2O3 + SO2 Cr^+3 - - > Cr2O7^-2 Fe^+2 - - > Fe^+3 Fe^+3 - - > Fe^+2 Cr2O7^-2 - -> Cr^+3***
Wednesday, May 25, 2016 by Lara

Chemistry
what happens in a condensation reaction head-to-tail joining of monomers side-by-side joining of monomers cross-linking of monomers*** substitution of halogen
Wednesday, May 25, 2016 by Amy

chemistry
add any reducing agent to kmno4+k2cr2O7+k1 and reconcile the charges and equations
Wednesday, May 25, 2016 by omowhe

Chemistry
At 100 degrees C, pure H2O has a vapor pressure of 760 torr. An aqueous solution has a concentration of 1.90 M MgCl2. The van't Hoff factor is 2.45. The density of the solution is 1.09 g/mL. Calculate the vapor pressure of the solution.
Tuesday, May 24, 2016 by Ayaka

Chemistry
A 1.0L of an aqueous solution of ethylene glycol, HOCH2CH2OH, is 60% HOCH2CH2OH by mass and has a density of 1.15 g/mL. Calculate the morality of the solution.
Tuesday, May 24, 2016 by Ayaka

chemistry
A 2.00 L flask is filled with propane gas (C3H8)at 1.00 atm and -15.0 Degrees Celsius. What is the mass of the propane in the flask?
Tuesday, May 24, 2016 by Anna

CHEMISTRY
WHEN THE PH IS 0.4 WHAT IS THE COLOUR OF THE INDICATOR
Tuesday, May 24, 2016 by APY QUEEN

CHEMISTRY
USING EQUATION SHOW HOW AQUEOUS SOLUTION OF HYDROCHLORIC ACID CONTAINING HYDROXONIUM ION NEUTRALISED POTASSIUM HYDROXIDE
Tuesday, May 24, 2016 by APY QUEEN

CHEMISTRY
WHEN THE PH IS 4.0 WHAT IS THE COLOUR OF THE INDICATOR
Tuesday, May 24, 2016 by APY QUEEN

CHEMISTRY
THE BASICITY OF TETRAOXOSULPHATE6 ACID IS 2.EXPLAIN THE STATEMENT WITH EQU SHOWING REACTION BTW ACID&POTASRGUM HYDROXIDE
Tuesday, May 24, 2016 by APY QUEEN

Chemistry
A saturated solution of lead ii trioxonitrte v was prepared at 22degree Celsius at 27cm3 of this solution required 46cm3 of NaCl solution containing 96gdm3 for complete precipitation. Find the solubility of the lead in trioxonitrte v at 22degree Celsius in (a) mol/dm3 (b) g/dm3.
Tuesday, May 24, 2016 by Mohammed

chemistry
What is the specific heat capacity of a metal if it requires 175.0 J to change the temperature of 15.0 g of the metal from 25.00°C to 35.00°C? 1.17 J/g°C 11.7 J/g°C .875 J/g°C 325 J/g°C 17.5 J/g°C
Tuesday, May 24, 2016 by Ha

chemistry
A is a solution of trioxonitrate(v) acid, HNO3, of unknown concentration. B is standard solution of sodium hydroxide containing 4.00g per dm3 of solution. 25cm3 portions solution B required an average of 24.00cm3 of solution A for neutralization, using 2drops of methyl orange...
Tuesday, May 24, 2016 by oward

chemistry
How much mole of dry hydrogen at NTP is liberated on heating 0.1 mole of Mg with excess of dilute HCl? Actually what is NTP? I know the balaned equation and 1mole Mg forms 1 mole H2 , then 0.1 mole forms 1/0.1 moles of H2? Plz help
Monday, May 23, 2016 by anu mol

Chemistry
Complete the following equations: 1. Benzene + hydrogen fluoride ----> 2. Propanoic acid + ethanol ----> 3. 3-pentanol --->(oxidized)
Monday, May 23, 2016 by Rose

Chemistry
Complete the following equations. Include names of all reactants and products A) CH3CH2CHCH - CH2+H2O --> | CH3 B) CH3CHC=CCH3 + H2 ---> | CH3
Monday, May 23, 2016 by Rose

Chemistry help asap
what two ingredients are used to prepare basic buffer solution??
Monday, May 23, 2016 by Naz

Chemistry
50 L of your 0.05M sodium. chloride solution, what volume of 1.25M solution would be necessary?
Monday, May 23, 2016 by Blake

Chemistry
Put the following in order, from the one with the greatest impact on reaction rate to the one with the least impact on reaction rate: temperature, amounts of reactant, and presence of catalyst.
Sunday, May 22, 2016 by Anonymous

Chemistry
Given 100 mL of pure water at 40C, what volume of a solution of hydrochloric acid, with a density of 1.175 g/mL and containing 34.4% HCI by weight, could be prepared?
Sunday, May 22, 2016 by Sidney

Chemistry
Ammonia gas is passed into water, yielding a solution of density of 0.93 g/mL and containing 18.6% NH3 by weight. What is the mass of NH3 per mL of solution.
Sunday, May 22, 2016 by Kelly

Chemistry
I posted this before and I know now to use P1T2=P2T1 but I was wondering what I would plug in as pressure and temp? just an example of one would be so great. In each of the four problem in this section, all gases are measured at the same temperature and pressure. 1) (a) What ...
Sunday, May 22, 2016 by Eve

Chemistry
The air in a cylinder of a diesel engine occupies 1.00 L at 30 degrees celsius and 1.00 atm. What is the pressure in the cylinder when the air is compressed to 0.0714 L (14:1 compression ratio) and heats to 480 degrees celsius? When the fuel explodes in the compression chamber...
Sunday, May 22, 2016 by Eve

Chemistry
How to convert 4.6-10.5 micrograms/dL to nmol/L? The answer is 59-135 nmol/L, but I have no idea how to set it up to get that answer.
Sunday, May 22, 2016 by Student

Chemistry
What mass of solid magnesium hydroxide is needed to neutralize .385 L of 2.5 M nitric acid?
Sunday, May 22, 2016 by Morgan

Chemistry
What is the concentration of 127 mL of solution made with .450 g of nickel (II) nitrate hexahydrate?
Sunday, May 22, 2016 by Morgan

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