lyne

This page lists questions and answers that were posted by visitors named lyne.

Questions

The following questions were asked by visitors named lyne.

What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilibrium depends upon the amount of [H+] already donated b...

Posted by lyne on Tuesday, March 25, 2008 at 11:44pm. What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilib...

k2=[H][SO4]/[HSO4] .012=(.01+x)(x)/(.01-x) Solve for x, and calculate pH where H is .01+x When I am solving for x does it become .012= .01x + x^2/ .01 -x.. what is the next step of solving for x?

Next step, multiply both sides by (.01-x) .012(.01-x)=.01x+x^2 gather terms, put in standard binomial form, use the quadratic equation, and solve for x. is the standard binomial x^2+.022x-1.2x10^-4

Next step, multiply both sides by (.01-x) .012(.01-x)=.01x+x^2 is the binomial x^2 + .002x-1.2x10^-4 what is the next step is the answer -.021 and -.023 for x

DrBob has given you the equation to use: k2 = [H^+][SO4^-]/[HSO4^-] and the values to substitute [H^+] = 0.01 + x [SO4^-2] = x [HSO4^-] = 0.01 - x k2 = 1.2 x 10^-2 you need to substitute these and solve for x. Remember that you are after 0.01+x [H^+] to c...

what is the name for CsF? i had cesium flouride but it's wrong... help?

solve for the variable ã(square root) ãy+6 - ãy = ã2 would i square both sides first? im stuck

if you have 55.6 grams of nitrate ions in a compound that consists of nitrate ions and plumbous ions, how many grams of the compound do you have? how do i do this problem im completely stuck!?

calcium hydroxide reacts in a neutralization reaction with sulfuric acid in a 1:1 ratio to form water and calcium sulfate. if you have 23.5 grams of calcium hydroxide, how many milliliters of water can you form? how do i use dimensional analysis to solve...

how do i balance the following(fill in the blanks): 1.) __BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF 2.) __CaCO3 + __H3PO4 --> __Ca3(PO4)2 + __H2CO3 3.) __B2Br6 + __HNO3 --> __B(NO3)3 + __HBr

A 46.2 gram sample of copper is heated to 95.4 degrees celcius and then place into a calorimeter containing 75.0 grams of water at 19.6 degrees celcius. The final temp of the water and copper is 21.8 degrees celcius. Calculate the specific heat capacity o...

a certain substance strongly absorbs infrared light having a wavelength of 3.75µm. what is the frequency of this light in hertz? i know that i have to use the equation c = frequency x wavelength and that c = 2.998 x 10^8 m/s. how do i convert that to µm/s...

A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound? i solved for empirical and got a 1:1 ratio so it would be SN. for the molecular do i take 184/46...

which element has a more favorable (exothermic) electron affinity? K Mg how do i determine this?

The element rhenium (Re) has two naturally occurring isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu. Calculate the mass of 185Re. am i supposed to multiply the at...

The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass. What is the empirical formula for adrenaline? i worked the problem out and got C8O3N but its not right..what did i do wrong?

Calculate the number of C, H, and O atoms in 4.50 g of glucose (C6H12O6), a sugar. help please?

Calculate the number of C, H, and O atoms in 4.50 g of glucose (C6H12O6), a sugar. okay i did it and i got just the C right and not the H and O help?

Dr Bob please answer below

What mass of iron contains the same number of atoms as 70.05 g of nitrogen?

The first character of a(n)__ must be a letter or an undeerscore(_). a.class b.identifier c.module d.program please explain

what would the the answer to 55%7 be?

what are three chemical characteristics and ten physical characteristics so far for physical i have -color -taste -smell -size -luster -shape -texture is this what they are asking for?

how many protons, nnutrons, atomic mass, mass number, and charge to each of the following have? sodium atom fluorine ion stannic ion for sodium i have protons=11 electrons=11 neutral charge how do i find the number of neutrons cause im pretty sure mass nu...

need help on chemistry below

okay and i don't understand what they are asking for for chemical characteristics. i was thinking like density, melting point, and boiling point but arent those physical too?

continued from before.... the question was what are three chemical characteristics and ten physical characteristics so then would i have to say something like -when iron rusts or -sugar burns or something like that i was thinking that would just be a chem...

how many mL in .00670 grams of a substance that has a density of 1.96 g/cm3. do you do 1.96g/cm3 divided by .00670 grams to solve for cm3 since cm3 = mL

are these correct when solving for proper significant figures 2.33 + 4.0045=6.33 .000456 + 1.0023=1.0027 2.33/4.0045=.582

arent the allotropes of carbon diamond buckminsterfullerene(or whatever its called haha) and graphite?

sorry for all the questions i have an exam tomoro! but what is intrinsic or intensive are they the same?

The term Intrinsic denotes a characteristic or property of some thing or action which is essential and specific to that thing or action, and which is wholly independent of any other object, action or consequence. A characteristic which is not essential or...

1/2|6y-9| +5 is < or = 2 i solved it and got two fractions but the answer is 0 can anyone explain? btw this is absolute value inequality.

What does it mean to say that the ions of an electrolyte behave independently of one another when the electrolyte is dissolved in water? is it something about the compound splitting?

predict the identity of the precipitate that forms. calcium nitrate, Ca(NO3)2, and sodium chloride , NaCl why does the answer come out as no reaction? couldnt it form to be CaCl2 or NaNO3 i thought it had something to do with the fact that Na and NO3 are...

NaCl + CuSO4 to write the product would i just do double replacement to get Na2SO4 + CuCl2 so the whole thing would be 2NaCl + CuSO4 --> Na2SO4 + CuCl2

Ca(s) + Br2(l) --> CaBr2 is synthesis my teacher also said that the cause of the reaction is stable electron configuration is that the same thing as the electrolytes one

i did a lab and found that of the products two gases were formed H2 and H2CO3 the question is... What are the tests that will verify the identity of these gases? what is this asking?

3BaCl + 2Na3PO4 --> Ba3(Po4)2 +^NaCl is Ba3(PO4)2 the ppt. because Cl salts are soluble so it will dissolve?

Ca + Br2 --> CaBr2 its synthesis and the reason the reaction happens is stable electron configuration but i don't understand why.

is there any way to tell if a teacher is currently 'on' and answering other question

Ca + Br2 --> CaBr2 its synthesis and the reason the reaction happens is stable electron configuration but i don't understand why. Responses chemistry - DrBob222, Wednesday, January 21, 2009 at 10:06pm Synthesis because it's two elements combining to form...

How many grams of oxygen are required to react with 2.50 g of propane (C3H8) to form CARBON MONOXIDE and water? this is what i did why is it wrong? 2.50 g C3H8 x 1 mole / 44.09 g C3H8 x 5mole O2 / mole = 9.1 g O2 everything cancels to get grams of O2 whic...

can anyone tell me if natalie is on

Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider a mixture of six nitrogen molecules and six hydrogen molecules in a closed container. Assuming the reaction goes to completion, what will the final product mixture be? number of NH3 mol...

Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 What mass of acetic anhydride is needed to completely consume 3.60 x 10^2 g salicyli...

When ammonia gas is burned in oxygen the products formed are water and nitrogen monoxide gas. Write the balanced equation showing this reaction NH4 + O2 --> H2O + NO i am stuck balancing this

im having trouble balancing this. I tried it but everything just ends up being uneven Ba(OH)2 * 8H2O + NH4SCN --> Ba(SCN)2 + H2O + NH3

a.Write the balanced chemical equation for the reaction of methane and sulfur. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.) 1CH4 + 4S --> 1CS2 + 2H2S (b) Calculate the theoretical yield of carbon disulfide when 24...

#2) Consider the preciditation reaction of a solution containing 3.50 grams of sodium phosphate mixed with a solution containing 6.40 grams of barium nitrate. How many grams of Barium phosphate can form? Ba(NO3 )2 + Na3 PO4 yields Ba3 (PO 4 )2 + NaNO3 #2b...

Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane. 2 NH3(g) + 3 O2(g) + 2 CH4(g) 2 HCN(g) + 6 H2O(g) If 5.00 x 10^3 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, as...

what is the function rule for this figure sides- 3 4 5 6 7 diagonals- 0 2 5 9 15

Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the following equation. 6ClO2 + 3H2O --> 5HClO3 + HCl If 142.0 g of ClO2 is mixed with 33.0 g of H2O, how many grams of the reactant wil...

function rule for tis points- 1 2 3 4 lines- 0 1 3 6 its similar to an earlir one i posted but i still don't quite understand thanks

Consider the following unbalanced reaction. P4(s) + 6F2(g) 4PF3(g) How many grams of F2 are needed to produce 114. g of PF3 if the reaction has a 78.1% yield? i tried it and got this 114g PF3 x (mol PF3/87.97g PF3) x (6 mol F2/ mol PF3) x (38g F2/mol F2)=...

A student prepared aspirin (C9H8O4) in a laboratory experiment using the following reaction. C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 The student reacted 2.00 g salicylic acid (C7H6O3) with 2.67 g acetic anhydride (C4H6O3). The yield was 2.00 g aspirin. Calculate...

Solutions that have large amounts of solute are___ solutions that have small amounts of solute are ___

we did a lab where we mixed an iron nail with cupric chloride to find the reaction is this the balanced equation... Fe + CuCl2 --> FeCl2 + Cu or would Fe and Cl bond different??

is cm^3 and cc and mL all the same??

we have to make an instrctinal packet showin relationships between moles and concentration. i cant find the following 1)how is the number of moles dissolved in a set amount of solvent related to the molarity? 2)how to determine the amount of solvent in 10...

how do you prepare a solution using the proper lab equipment(both from dry solid and a stock solution) i researched it but all i found was the definition for stock solution any help please!!

How much water should be added to 55.0 mL of 0.201 M HCl to dilute the solution to 0.155 M? i used M1V1 = M2V2 and i got 71.3mL its wrong so im confused

How would you prepare 250.0 ml of a 0.6 M aluminum sulfate solution

What is the molarity of a solution when 3L of a 4M solution is mixed with 3L of a 6M solution?

How much of each starting material would you use to prepare 2.00 L of each of the following solutions? 0.240 M NaOH from 1.00 M NaOH stock solution what do i do with the .100 M and .240 M??

How much water should be added to 45.0 mL of 0.225 M HCl to dilute the solution to 0.155 M? i did .225M x .045L / .155M = 65mL so wouldnt 20 mL be added?

If the volume of solute is 6 ml and the volume of the solution is 300 ml, what is the solute's percent by volume? is it solute/solution so % = 6/300 so then would it be % = .02 would i change it to 2%???

What volume of .101 M HNO3 is required to neutralize each of the following solutions? there are four and i got them all right but this one... 51.1 mL of .127 M NH3 i got 193 mL can someone please help???

Calculate the sodium ion concentration when 80.0 mL of 4.5 M sodium carbonate is added to 30.0 mL of 1.0 M sodium bicarbonate. how do i solve this I don't really know where to begin.. is there a formula for finding concentration because we don't learn thi...

how many moles of hydroxide ions are there in 82.35 mL of a 2.164M Sr(OH)2 solution? i understand how to do the math for problems like these, but i don't know how to find the moles of just hydroxide ions.

what are the different types of solutions?? is it saturated nonsaturated and supersaturated?

for my test i have to be able to Be able to determine the final molarity of a mixture of two solutions my teacher said the formula was m1v1 = m2v2/m1+v2 or something like that is that right??

does normality measure concentration of solutions??

Write a chemical equation showing how each of the following species behaves as a base when dissolved in water a.) O2- i have O2- + H2O --> HO2- + OH- how do i make this right??

help below please

Calculate the hydrogen ion concentration and the pH of each of the following solutions of strong acids. (a) 0.00010 M HCl if you could just explain how to do this that would be great! thanks

Calculate the hydrogen ion concentration, in moles per liter, for solutions with each of the following pH values. pH=1.10 im guessing that this is what i did in my previous question except now i have to do it backwards. but i don't know how to do the calc...

NH3 + HCl --> can someone please finish that?? is it 2H2 + N2 + Cl or something? if so how would i balance it?

Most window cleaners are aqueous solutions of ammonia. A 9.00 mL sample of a particular window cleaner requires 42.95 mL of 0.0508 M HCl for its titration. What is the molarity of ammonia in the window cleaner? i am completely lost i cant even find the ba...

The total acidity in water samples can be determined by neutralization with standard sodium hydroxide solution. What is the total concentration of hydrogen ion, H+, present in a water sample if 300. mL of the sample requires 7.5 mL of 2.8 10-3 M NaOH to b...

how did geologists determine the divisions of the geologic time scale?

what does the geologic time scale indicate about the change in life-forms over time?

what's one good and bad effect of Prohibition?

Give two reasons for the new interest in leisure activities in the 1920s. i already know one: rising wages and labor-saving appliances gave families more money and more time in which to spend it.what else?

Define variables and write a system of equations for each situation. Solve using substitution. Suppose you are thinking about buying one of two cars. Car A will cost $17,655. Youn can expect to pay an average of $1230 per year for fuel, maintenance, and r...

okay we are drawing bonds and i was wondering how i am supposed to know if you can make a double or triple bond for example for NH2OH why cant i make the bond between N and O triple instead of leaving lone pairs.. thanks

Why are all diatomic molecules diatomic molecules linear, regardless of the number of valence electron pairs on the atom? i don't understand this question what is meant by linear?

hpw would i draw a lewis structure for a molecule with 3.5 bonds for example NO2???

when do you need to use the octet rule for lewis structures and when does it not apply i am confused for N2O4 i cant get the rules to work with the structure

what is the duet rule?

How do multiple bonds introduce rigidity into molecules? what is meant by rigidity??

I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C ayoms form a triple bond and the Cl atoms form single bonds. Therefore i think that the central C atom hybridizes into sp. if this is correct, my question is how do i know whi...

why is COCl2 polar a. different electronegativities b. nonsymmetric c. tetrahedral d. symmetric e. trigonal planar more than one can be chosen also wht is HCN polar a. nonsymmetric b. different electronegativities c. trigonal planar d. linear e. bent f. s...

help with below questions please and thank you

I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C atoms form a triple bond and the Cl atoms form single bonds. Cl | C'triple bond'C | Cl Therefore i think that the central C atom hybridizes into sp. if this is correct, my que...

Answers

The following answers were posted by visitors named lyne.

What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilibrium depends upon the amount of [H+] already donated b...

what letter do you want to solve for?

well you would need to get rid of the denominator(which is r) so you would multiply each side by the denominator (which is r). Now you have t x r = d

thanks sorry i posted it again when i didn't get an answer for a long time thanks again

start off with the parenthesis in the middle of the problem and work outwards. first do 4 + 9 then subtract the two then multiply by 5 first and then add three last divide by two parenthesis always go first then exponents mult and div add and subt i think...

use the FOIL method. multpily the the first number to the First numbr then to the Outside then multiply the Inside numbers then the Last. you get 16r^2 - 16r + 16r - 16 which equals 16r^2 -16

if i were to put 2 for the first blank does it go to the B and the F3? if it does wouldn't that mean the first would be B2F6 and the last would be Li3F3, so the F would be unbalanced? i don't get that part...

i think im still a little confused would the next one #2 be 3, 2, 1, 3

ummm 1,6,2,6???? idk haha

oh alright i get it thanks :)

shouldnt it be .626(186.956)+.374*X=186.207

thanks i forgot the H :)

you multiply by Avogadro's number. It is 6.022 x 10^23 do u have an example problem?

okay first i found C6H12O6=180.156g/mole then i changed 4.50g to moles by mult. by the 180.156g/mole and got .0250 mole then for the C i did .0250 x 6 for H .0250 x 12 and for O .0250 x 6 then i multiplied all of them by 6.022e23atoms/mole i got 9.03e22 f...

i think they mean sqrt25 is simplified to 5 so you are still left with the sqrt2 because it cant be simplfied.. so 5sqrt2

then how would i get one right and not the others??

i checked my work and i did divide i just typed that wrong

first one is (x+2)(x+3) if you use FOIL method

okay thanks that worked :)

i got 3.011 x 10^24 atoms N how do i convert this to Fe?

i got 3.011 x 10^24 atoms N how do i convert this to Fe?

Well I took chem last year... Basically, when two atoms share electrons, they become covalent. However, if one of the atoms is bigger than the other (and has more positive ions), the electrons will be more attracted to that nucleus. It sort of relates to...

Diameter = Circumference/pi Circumference divided by Pi = Diameter Diameter divided by 2 = radius

try and google it

okay and i don't understand what they are asking for for chemical characteristics. i was thinking like density, melting point, and boiling point but arent those physical too?

okay but why is it -1 charge?

well its a double replacement first of all so they all switch the way my teacher taught it was that NO3 and Cl are the 'girls' and the metals are the 'boys' all elements to the right of the stair step on the periodic table are the girls. to the left the b...

ohhhh i get it!!! i always thought that it was like a characteristic of something kind of like melting point is when really it tells if a property depends on amount of matter thanks so much

ohh okay thanks so much that makes sense! thanks again =)haha

is this even homework????

well comparing doesnt necesarily mean that the two subjects have to be different. Not unless your teacher said so. so just write your paper about the similarities of the two. I don't know any other way to do it

okay how can you tell if they are strong electrolytes or the oxidation one i understand the others

Ca(s) + Br2(l) --> CaBr2 is synthesis my teacher also said that the cause of the reaction is stable electron configuration is that the same thing as the electrolytes one

okay but doesnt this happen in a lot of the synthesis ones then?

oh okay i get it!! 2Cs (s) + NiSO4 (aq) --> Cs2SO4 + Ni is activity series i understand the equation but not how it is activity series

thanks sooo much i totally get it now wow thanks again :)

oh okay well i had my balanced equation like this C3H8 + 5O2 --> 3CO2 + 42O so what should be changed for my equation?

yupp that's right :)

no, if you foil out your factor it will come out as 6x^12 + 20x^6 + 6. i am not familiar with the U substitution but if you try again i can tell you if you are right.

what is your question??

No, you would not. Just as you don't capitalize the of in United States of America

okay that makes perfect sense thanks :)

you have to bring the -4 into each number that is in the parenthesis by multiplication. so you do -4 x 1, -4 x 2m, and -4 x n you should get -4 + 8m - 4n then add on the 4 at the end so you get -4 + 8m -4n + 4 it simplifies to 8m - 4n since the positive a...

$32 and $45 i just used guess and check.

oh okay yea that sounds familiar! so is it the same process for this... Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid-fuel rocket motors. The reaction is given below. Fe2O3(s) + 2...

okay so i got 40.0g Fe2O3 and 13.5g Al how do i use this to get the last part

yea sorry my bad i didn't post it but i figured it out :) thanks for all the help

okay i got my answer of 1.75 mol and 3.05 mol but i don't understand part 4

yeaa i understand and can see the patterns i just don't know how to find the function the way you did...

thanks soo much

thanks and for number two i left something out on accident sorry we had to make a graph of solubility of common inorganic compounds in grams solute per 100 mL solvent there were several different substances but here is the info for KI 0'C 10'C 20'C 30'C 4...

sorry im not really understanding my graph only goes up to 150g/100H2O so do i have to extend it in order to get the answer im lost

yea i did mean solute sorry thanks for the help!!

it didn't say so ill double check my book thanks

thank you very much

this is answered below

CrO4 is a polyatomic ion so it is one big part the charge on it is -2 the 4 has nothing to do with it if it were (CrO4)4 then it would be unbalanced

it isnt an element its a polyatomic and it is C2O4 with a -2 charge

yes it could be 6, 5, 4, 3, or 2 if your periodic table isnt detailed enough it probably wont say

the formula is interest = prt

.0511 L NH3 x (.127 mol NH3/L NH3) x (3mol HNO3/1 mol KOH) x (L KOH/.101 ml HNO3) = .193L = 193 mL i don't know where i messed up

yep that's what i got thanks a ton :)

never mind i took a random guess and got it right :)

is another reason because people wanted to watch movies, which were popular during the time??

okay i understand so writing the Lewis structures is just the math not the drawing?

Since you have the cooefficient of 6 before HCl, you must have 6 Cl atoms on the other side as well. AlCl3 already has 3 Cl atoms so if you put a 2 as the coefficient that gives you 6 (2 x 3 =6). You have balanced the Cl atoms but now you have unbalanced...

yes you are correct for both questions if it is not stated that it is [H+] or [OH-] then you should ask your teacher

i believe it stands for quantum mechanical model. i guess my teacher shortened it but she just describes it as the flower model.

would Germany signing the armistice be a good one?

do you know the rules? 1. 4 + 6(4) = 28 valence electrons 2. 8(5) = 40 electrons wanted 3. 40 - 28 = 12 shared electrons 4. 12 / 2 = 6 bonds 5. 28 - 12 = 16 electrons not in bonds 6. 16 / 2 = 8 lone pairs create the structure from this and yes 6 bonds mea...

and try answering mine please =)

thank you so much

from what i can remember when i took geometry i think that you use the distance formula i believe it is d = *square root of* (x2-x1)^2 + (y2-y1)^2 just plug in the numbers for example 4 would be x1 and -6 would be x2

i mean numerator

yeaa thank youu!!

titus oates maybe? so just oates

do you have a textbook or something to look these up? answers are usually bolded words :)

haha okayy thankss

First a paragraph should be 4-5 sentences. Try breaking up your ideas and adding details. For exapmle, when you say you and your family got on a plane to Seattle, tell about what time you left, what it was like, how long it took, or any other detail. Do t...

Can you give me one of your problems? I can explain it better if you do :)

those wierd things were supposed to be square roots btw

ummmm you cant post yr whole homework assignment on here....

sio i cant find the quotient of it? I need to find the qoutient so that i can find the oblique asymptote so i can graph the function.

thank you very much :)