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February 25, 2017

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
Consider the reaction between 56.0 mL of liquid ethanol (C2H5OH; density = 0.789 g/mL) and 26.0 L of O2 at 27.0°C and a pressure of 1.95 atm. The products of the reaction are CO2(g) and H2O(g). Calculate the number of moles of H2O formed if the reaction goes to completion.
Tuesday, November 1, 2016 by Anonymous

Chemistry
What is the frequency of light that is composed of photons that each has an energy of 5.20 × 10−25 J -Do I divide this by 3.00 X 10^8
Tuesday, November 1, 2016 by Rebbeca

Chemistry
net ionic equation of 3Cr(c2h3o2)2 +2(nh4)3(po4)--Cr3(po4)2+6Nh4(c2h3o2)wit​h states
Tuesday, November 1, 2016 by Kendall De

chemistry
If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the Balmer series emission spectrum. Calculate the wavelength λ associated with the fifth line. Express your answer with the appropriate units.
Tuesday, November 1, 2016 by myah

Chemistry (Concentratrion/molarity)
A 25.00 mL aliquot of HCl of unknown concentration is titrated with 25.62 mL of 0.1011 M NaOH. What is the molarity of the HCl solution?
Tuesday, November 1, 2016 by Ray

college chemistry
Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 75 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to answer...
Tuesday, November 1, 2016 by jamie

AP Chemistry Help!
I had to conduct an experiment to find the enthalpy of reaction for : 4Fe + 3O2 + 6H2O ----> 4Fe(OH)3 In the experiment , I started with an inital temperature of 22.3 C and edned with 36.7 C so the delta T is +14.4C. Now it's telling me to calcualte the delta Hrxn for the ...
Tuesday, November 1, 2016 by Jessica

Chemistry
I need help writing the net ionic equation for 3Cr(c2h3o2)2 +2(nh4)3(po4)--Cr3(po4)2+6Nh4(c2h3o2)wit​h states
Tuesday, November 1, 2016 by Kendall De

Chemistry
Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 70 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to answer ...
Tuesday, November 1, 2016 by jamie

Chemistry
What is the balanced equation for the reaction including states? Does it form a precipitate? Cu(NO3)2 + KI
Tuesday, November 1, 2016 by Kendall De

Chemistry
complete and balance NaHCO3 (aq) + H2SO4 (aq)
Tuesday, November 1, 2016 by Angele

Chemistry
Formula of (ch3ch2)2chch2ch(ch3)2
Tuesday, November 1, 2016 by Anonymous

Chemistry help emergency? (theoretical mass/mol)
I am supposed to calculate the theoretical mass and moles of Cu. However I am given the mass of 2 reactants in the balanced equation: 3CuCl2*2H2O + 2Al -> 3Cu + 2AlCl3 + 6H2O I am given the mass of CuCl2*2H2O to be 0.477g and the mass of Al is 0.267g. If I wanted to ...
Tuesday, November 1, 2016 by ray

Chemistry 11
A 5.0 g sample of Cu(NO3)2-nH20 is heated, and 3.9 g of the anhydrous salt remains. What is the value of n? I got as far as finding the molar mass of Cu(NO3)2, which is 187.5g/mol Please help me further with this question.
Tuesday, November 1, 2016 by Rona

chemistry
Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu. Calculate the...
Monday, October 31, 2016 by andrea

physical chemistry
The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?
Monday, October 31, 2016 by Joseph

Organic Chemistry
Draw the product of the reaction: CH3CH2CH (double bond) CH2 + Cl2
Monday, October 31, 2016 by Dominique

chemistry
what is the name of this coordination compound [CoSO4(NH3)5]Br?
Monday, October 31, 2016 by James

chemistry
If I only have the name of this transitional coordination compound, bis(enthylenediamine)dinitroiron (III) sulphate how do you find the 2 outside the square bracket of this same thing but in formula form? [Fe (en)2 (NO2)2]2SO4 thanks.
Monday, October 31, 2016 by Sherlique

chemistry (charges)
just want to check if this group is neutral, R-NH2 thanks!
Monday, October 31, 2016 by Anonymous

chemistry
HClO4 Express your answers as ions separated by a comma.
Monday, October 31, 2016 by Precious Wiefue

physical chemistry
Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3
Monday, October 31, 2016 by Joesph

Chemistry
Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCO3(s) arrow CaO(s) + CO2(g). What mass of lime can be produced from 2001.2 kg of limestone?
Monday, October 31, 2016 by Andrew

Chemistry
For the reaction HCl + NaOH → NaCl + H2O, how many moles of hydrochloric acid are required to produce 281.0 g of water?
Monday, October 31, 2016 by Andrew

Chemistry
how many milliliters of concentrated H2SO4 of density 1.84 containing 95.6% by weight of the acid is required to prepare 5litres of battery acid of density 1.18 containing 25.2% by weight of acid?
Monday, October 31, 2016 by Evarestus

Chemistry
The combustion of a hydrocarbon X (30 cm3) with 350 cm3 of oxygen at STP resulted in the formation of 440 cm3 of gaseous products. The volume of gases was reduced to 360 cm3 when the excess O2 was removed and then reduced by half when bubbled through NaOH.
Monday, October 31, 2016 by Cavenia

science, organic chemistry
Determine the amount of compound remaining in the aqueous phase and organic phase and organic phase if a 5.0g organic compound is dissolved in 100 mL of water and is extracted with three 50-mL portion of ether (kb= 10). Compare this with one 150 ml portion with ether. Which is...
Monday, October 31, 2016 by Anonymous

Chemistry
Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is ΔHf° = –799 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 157 kJ/mol. The first and second ionization energies of M are IE1 = 785...
Monday, October 31, 2016 by Joseph

Chemistry
How can I draw a lewis dot structure of XeF2O?
Sunday, October 30, 2016 by Joseoh

chemistry
what is the name of this coordination compound [CoSO4(NH3)5]Br? my attempt: cobaltsulfatepentaamine Bromine
Sunday, October 30, 2016 by chemi

Chemistry
Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is ΔHf° = –799 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 157 kJ/mol. The first and second ionization energies of M are IE1 = 785...
Sunday, October 30, 2016 by Joseoh

chemistry
Oxygen gas and aqueous benzoic acid react to form carbon dioxide gas and water gas. Determine the mass of water in grams if 5.43×104 milligrams of oxygen reacts with an excess of benzoic acid. I balanced the equation to 2C7H6O2+15O2=14CO2+6H2O
Sunday, October 30, 2016 by paige

Chemistry
Which one of the following is NOT a physical process? A. Dry ice subliming B. Steam condensing C. Alcohol evaporating D. Melting ice E. Gold plating jewelry
Sunday, October 30, 2016 by Anjali

Chemistry
Consider the following reaction. 2Fe2O3 --> 4Fe+3O2 Hrxn=+824.2 The Formation of 21.0 of Fe results in 1)the release of 77.5 kJ of heat. 2)the absorption of 3.10 × 102 kJ of heat. 3)the release of 4330 kJ of heat. 4)the absorption of 77.5 kJ of heat. 5)the release of 3.10...
Sunday, October 30, 2016 by Danny

chemistry
The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?
Sunday, October 30, 2016 by Joseph

chemistry
Calculate the work done (in joules) when 5.0 mole of water is frozen at 0°C and 1.0 atm. The volumes of five moles of water and ice at 0°C are 0.0900 L and 0.0980 L, respectively.
Sunday, October 30, 2016 by Dani

chemistry
Calculate the heat of decomposition for this process at constant pressure and 25°C. (Look up the standard enthalpy of formation of the reactant and products in the table; ΔH°f(BaCO3(s)) = -1218.8 kJ/mol, ΔH°f (BaO(s)) = -558.2 kJ/mol and ΔH°f (Na2CO3(s)) = -...
Sunday, October 30, 2016 by Dani

chemistry
Calculate the heats of combustion for the following reactions from the standard enthalpies of formation listed in Appendix 2. (ΔH°f (HgO(s)) = -90.7 kJ/mol and ΔH°f (FeO(s)) = -272 kJ/mol.) (a) 2 Fe(s) + O2(g) 2 FeO(s) kJ (b) 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l)
Sunday, October 30, 2016 by Dani

chemistry
Ethanol (C2H5OH) and gasoline (assumed to be all octane, C8H18) are both used as automobile fuel. If gasoline is selling for $1.45/gal, what would the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and ΔH°f of octane are 0...
Sunday, October 30, 2016 by Dani

Chemistry
A 2.35 g sample of a substance suspected of being pure gold is warmed to 72.2 ∘C and submerged into 15.5 g of water initially at 24.1 ∘C. The final temperature of the mixture is 26.5 ∘C. Part A What is the heat capacity of the unknown substance? Part B Could ...
Sunday, October 30, 2016 by Jo n

Chemistry
Suppose a student diluted and titrated a bleach unknown exactly as described in the experimental procedure, except only a single titration was performed which required 12.62 mL of 0.100 M Na_{2}S_{2}O_{3} Calculate the number of moles of ClO in the sample titrated.
Sunday, October 30, 2016 by Linda

Chemistry
how many grams of pure uranium can theoretically be extracted from 10.0kg sample of pitchblende which is 92.0%uo2
Sunday, October 30, 2016 by Tamo

Chemistry
What ionic compound, is the primary source of a chicken's egg? I think it is calcium carbonate? If it is thought what is the logical/ explanation behind it can someone please explain this to me. Btw what would be the chemical equations for an egg being placed in water, and for...
Sunday, October 30, 2016 by Holfbrincl PLEASE HELP

Chemistry
Does group 18 elements like He, Ne, Ar, Kr soluble in organic solvents?
Sunday, October 30, 2016 by Husler

chemistry
Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.
Sunday, October 30, 2016 by Joseph

chemistry
When performing an extraction, is it better to have a higher or lower K (distribution coeffictient/ partition coefficient) value? Explain.
Sunday, October 30, 2016 by Chem

Chemistry-Dr.Bob
The specific rotation of pure enantiomer is known from the literature to be -20. The measured value of a solution containing A plus its enantiomer B (specific rotation must be +20) is -40. What is the ee (enantiomer excess) of this sample?
Saturday, October 29, 2016 by Sarah

Chemistry
The specific rotation of pure enantiomer is known from the literature to be -20. The measured value of a solution containing A plus its enantiomer B (specific rotation must be +20) is -40. What is the ee (enantiomer excess) of this sample?
Saturday, October 29, 2016 by Sarah

Chemistry
To what volume must 10ml of 5M HCl be diluted to make a 0.5M HCl solution......???? A.1ml B.50ml C.100ml D.500ml E.1000ml
Saturday, October 29, 2016 by Sawera

Chemistry
Does group 18 elements soluble in organic solvents such as tetra-chloro-methane or alcohol
Saturday, October 29, 2016 by Husler

Chemistry
102.0 MHz (typical frequency for FM radio broadcasting) Express your answer using four significant figures.
Saturday, October 29, 2016 by Chelsea

Science chemistry
Also. If you are given the conductivity of an unknown chemical, what the blue and red litmus paper change into when you check the chemical. And the pH level and solution type. How do you know the solution name and formula? I never learned how to find the solutions name of ...
Saturday, October 29, 2016 by Zubaida

Science chemistry
Also. If you are given the conductivity of an unknown chemical, what the blue and red litmus paper change into when you check the chemical. And the pH level and solution type. How do you know the solution name and formula? I never learned how to find the solutions name of ...
Saturday, October 29, 2016 by Zubaida

Science chemistry
Does hydrogen borate conduct electricity? We were told to search this up but I can't find it online and my class never did a lab on it.
Saturday, October 29, 2016 by Zubaida

Chemistry
A 1.00Lgas sample at 1.00degree celsius and 600torr contain 50.0%helium and 50.0%xenon by mass. What are the partial pressure of the individual gasses?
Saturday, October 29, 2016 by Tiangaydonzo

Chemistry
What mass of Cu(IO3)2 can be formed from 0.690g of CuSO4-5H2O?
Saturday, October 29, 2016 by Anonymous

Chemistry
Consider the following reaction. CaSO4(s) reverse reaction arrow Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4x10^-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 ...
Saturday, October 29, 2016 by Anonymous

chemistry
How many grams of potassium iodide, KI, are required to make 2.0 L of a 0.1M solution?
Friday, October 28, 2016 by Blake

Chemistry
A mixture of NaOH and HCl is formed in a calorimeter. There is 50 mL of 2.078 Molar HCl and 51.7mL of 2.134 Molar NaOH. How would the heat capacity of the calorimeter change if you were to double the volume of NaOH? Justify your answer
Friday, October 28, 2016 by Max

Chemistry
A good vacuum pump on Earth can produce a vacuum with a pressure as low as 1.96 × 10-8 torr. How many molecules are present in each milliliter at a temperature of 23.0ºC?
Friday, October 28, 2016 by Hunter

Chemistry
What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-
Friday, October 28, 2016 by Anonymous

Chemistry
What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-
Friday, October 28, 2016 by Anonymous

Chemistry
In the reaction of formation of sodium chloride (NaCl), 15 g of sodium is placed in contact with 20 g of chlorine. What is the reactant in excess and its mass in excess?
Friday, October 28, 2016 by MONICA

Chemistry
A solution of NaOH(aq) contains 5.4 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Friday, October 28, 2016 by Anonymous

college chemistry
using cu+2AgNo3= Cu(No3)2 + 2Ag if you start with 100 grams of copper how many grams of silver can be obtained
Friday, October 28, 2016 by jordan

chemistry
Consider these reactions where M represents a generic metal 1. 2M(s) +6HCl(aq) --> 2MCl3(aq)+3H2(g) (deltaH)= -725.0 kj 2. HCl(g)-->HCl(aq) (deltaH)= -74.8kj 3. H2(g)+CL2(g) --> 2HCl(g) (deltaH)=-1845.0kj 4. MCL3(s) --> MCl3(aq) (deltaH)= -476.0kj Use the ...
Friday, October 28, 2016 by anon

chemistry
Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?
Friday, October 28, 2016 by anon

chemistry
Calculate the standard enthalpy change for the following reaction at 25 °C. H2O+C(graphite)(s) --> H2(g) +CO(g)
Friday, October 28, 2016 by anon

chemistry
The following equation is the balanced combustion reaction for C6H6: 2C6H6(L) + 15O2(g) --> 12CO2(g)+6H2O(L)+6543 kj If 7.700 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?
Friday, October 28, 2016 by anon

chemistry
If the heat of combustion for a specific compound is -1180.0 kJ/mol and its molar mass is 40.91 g/mol, how many grams of this compound must you burn to release 114.50 kJ of heat?
Friday, October 28, 2016 by anon

chemistry
A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/K. The observed increase in temperature is 21.1 K at a constant pressure of one bar. Using ...
Friday, October 28, 2016 by anon

chemistry
When a 8.00-g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.344 kJ·K–1, the temperature decreases by 0.400 K. Calculate the molar heat of solution of KBr.
Friday, October 28, 2016 by anon

chemistry
A researcher studying the nutritional value of a new candy places a 4.10-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.47 °C. If the heat capacity of the calorimeter is 33.90 kJ·K–1, how many ...
Friday, October 28, 2016 by anon

chemistry
At constant volume, the heat of combustion of a particular compound is –3947.0 kJ/mol. When 1.311 g of this compound (molar mass = 136.58 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 4.343 °C. What is the heat ...
Friday, October 28, 2016 by anon

chemistry
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) for Na(l) at 500 K.
Friday, October 28, 2016 by anon

chemistry
When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.
Friday, October 28, 2016 by anon

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?
Friday, October 28, 2016 by anon

chemistry
If you combine 360.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
Friday, October 28, 2016 by anon

Chemistry
A solution of concentrated NaOH is 16.7M. If the density of the solution is 1.02 g/mL, what is the percent by mass of NaOH? I have tried different calculations and molarity and % but im not catching on at all
Friday, October 28, 2016 by Anonymous

Chemistry
A solution of concentrated NaOH is 16.7M. If the density of the solution is 1.02 g/mL, what is the percent by mass of NaOH? I have tried different calculations and molarity and % but im not catching on at all
Friday, October 28, 2016 by Anonymous

organic chemistry
inversion of S configuration to R configuration?????
Friday, October 28, 2016 by Anonymous

Chemistry
Please write down the redox reactions (using the half-reaction method!) a)Cl2 from OCl- and Cl- in acidic solution b)Br2 from BrO3- and Br- in acidic solution -You don't have to do both, but could you help me step up the half reactions especially for OCl- --> Cl2
Friday, October 28, 2016 by Annie

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?
Thursday, October 27, 2016 by sam

Chemistry
How much sulphuric acid containing 90% H2SO4 by wt. is needed for the production of 1000 kg of HCl containing 42% HCl by weight in this reaction. 2NaCl + H2SO4 -----> Na2SO4 + 2HCl
Thursday, October 27, 2016 by Kritim

chemistry
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 7.00 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use CP= 30.8 J/(K·mol) for Na(l) at 500 K.
Thursday, October 27, 2016 by sam

chemistry
When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.
Thursday, October 27, 2016 by sam

chemistry
In a constant-pressure calorimeter, 60.0 mL of 0.300 M Ba(OH)2 was added to 60.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 21.75 °C to 25.84 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g...
Thursday, October 27, 2016 by sam

Chemistry
Consider a mole of gas obeying the equation of state P⋅V = n⋅R⋅T + n⋅B(T)⋅P. Find w, q, ΔU, ΔS, ΔH, ΔA, and ΔG for a reversible isothermal expansion of this gas. Express your answers in terms of initial and final pressures...
Thursday, October 27, 2016 by Joesph

chemistry
An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 8305 J. What is the specific heat of the gas?
Thursday, October 27, 2016 by sam

chemistry
If you combine 360.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
Thursday, October 27, 2016 by sam

Chemistry
How many grams of H2O are required to react with excess CaC2 to produce 23.0 g of C2H2 according to the following equation? CaC2 + 2H2O -> Ca(OH)2 + C2H2 a.4.5 b.15.9 c.31.8 d.1.766 I think this equation works out by multiplying 2 moles by the molar mass of H2O. Please ...
Thursday, October 27, 2016 by Rebecca

Chemistry
If 3.60 moles of SiO2 and 3.60 moles of C react to form SiC accodring to the equation SiO2 + 3 C -> SiC + 2 CO how many moles of CO will be produced? a. 1.20 b.2.40 c.3.60 d.7.20 -Do I have to use SiC in any part of the equation, I am very confused and I think I just need ...
Thursday, October 27, 2016 by Rebecca

Chemistry
Methane, CH4 is the main component of natural gas which is used for cooking in many homes. The molar heat of combustion of methane is -890kj/mol. A cook wants to boil some water on a gas stove. If the stove burns 5.00g of methane to heat 2575 ml of water, what is the ...
Thursday, October 27, 2016 by Ray

Chemistry
My question talks about a buffer with HA and NaA, where NaA is the sodium salt of the acid. What does the equation for this look like? HA + NaA --> H+ + NaA2 ??
Thursday, October 27, 2016 by Dwayne

Chemistry
The principal quantum number (n): (1) specifies the subshell of the orbital. (2) specifies the principal shell of the orbital. (3) specifies the 3-D shape of the orbital. (4) specifies the maximum number of electrons. (5) none of the above
Thursday, October 27, 2016 by Beth

Organic Chemistry 1
Consider the HF solution with the concentration of 5%(w/v). You can convert the % concentration into the molarity. a) Assume that you have 100ml of this solution. Determine the number of moles of HF if the concentration of HF is given as 5%(w/v) For this part I did 5% is 5g ...
Thursday, October 27, 2016 by Zaza to DrBodd22

Organic Chemistry 2
The typical % yield for the reduction of 9-fluorenone using NaBH4 to obtain 9-fluorenol is 80%. In my experiment I obtained 89 %. Can you explain the reasons why my yield is higher? Is it better to obtain a higher yield or a lower yield than the expected one?
Thursday, October 27, 2016 by Alice

chemistry
A student determines the heat of dissolution of solid potassium perchlorate using a coffee-cup calorimeter of negligible heat capacity. When 2.13 g of KClO4(s) is dissolved in 106.00 g of water, the temperature of the solution drops from 25.00 to 23.17 °C. Based on the ...
Thursday, October 27, 2016 by ayesha

Chemistry
Draw the product(s) of the following reaction CH3-CH2-C(triple bond)C-CH2 ---------> ? (Na/NH3)
Thursday, October 27, 2016 by anon

Chemistry
Define electronegativity and then describe the trends in electronegativity within groups and across periods in the periodic table. Provide examples of the elements with the highest electronegativity value within a group and an example of an element with the highest energy ...
Thursday, October 27, 2016 by PLEASE HELP

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