# Chemistry Equation(again)

86,035 results

### Math

How do I solve this equivalent equation? 5x +2 < 17 (again the <is underlined) Do I subtract 2 from each side so it would read 5x < 15 (again the < is underlined) than divide each side by 5 so the x < 3 (again the <is underlined) is the answer? Also, how do I...

### Chemistry Equation(again)

What I wrote is the balanced ionic equation. The ++ are written as exponents and could be written as we usually do it as Cu^+2 + Zn ==> Zn^+2 + Cu. For the molecular equation, it is Cu(NO3)2 + Zn ==> Zn(NO3)2 + Cu So the ionic equation for adding copper(II)nitrate to ...

### Chemistry

Using the equation: 2C2H6 + 7O2--> 4CO2 + 6H20 How many moles of CO2 are produced by the reaction of 21.0 mol O2? Again, not sure how to write it correctly, but if I multiply 7O2 by 3, then I should do the same to the other side of the equation to make it 12CO2?

### precal

The smaller of 2 numbers is 10 less than 4 times the greater number. The bigger number is 19 more than the smaller one. If x is the smaller number one equation is: a)x+y=19 b)x=19-y c)y=x+19 d)x=y+19 I'm almost positive it is d I just want to check. A second equation is: a)x=...

### Chemistry again

PbO2(s) + Pb(s) + H2SO4(aq) PbSO4(s) + H2O(l) Can anyone help me identify what the redox reactions are for this equation? I don't understand how to do it when there are more than 2 chemicals.

### algebra

1)Write an equation for the parabola with focus (1,3)and vertex(0,3) answer= x= 1/4(y-3)^2 2)Write an equation for a circle if the endpoints of a diameter are at (1,1)and(1,-9) answer= (x-1)^2+(y+4)^2=25 3)Which is the equation of a circle with center (0,1)and radius 2 units? ...

### Chemistry Equation(again!)

Posted by chrissy on Saturday, January 6, 2007 at 1:23pm. In a lab expirement you add copper(II)nitrate to pure zinc. Write a balanced equation for this expirement and predict if a reaction will occur. For Further Reading Chemistry Equation - DrBob222, Saturday, January 6, ...

### 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. ...

### grade 12 chem - check my answer again please

Hi, please check my work: In an experiment, 23.4 g of FES are added to excess oxygen and 16.5 g of FE2O3 are produced. The balanced equation is: 4FeS + 7O2 --> 2Fe2O3 + 4SO2 Calculate the % yield. My Answer: nFeS=23.4g/87.92 g/mol =0.266 mol 4mol FeS / 0.266 mol = 7mol O2/ ...

### maths algebra

HI STEVE, THANKS for your reply back it was the wrong answer the one you worked, yes a hard question, here is an example of simultaneous questions. x-2/3 + y-1/4 =13/12 (1) 2-x/2 + 3+y/3 =11/6 (2) first step is to get rid of fractions. in equation (1) the lcm of denominators ...

### maths

write the equation in slope-intercept form. then graph the equation. 1. 6x-4y=3 2. 2y+5x=10 can you please help me with at least one of them? thanks! also, where it says 'then graph the equation', I know we can't graph here, so you can ignore that. but if you know any other ...

### geometry again again again again

If angle AFB= 8x-6 and angle BFC= 14x +8, find the value of x so that angle AFC is a right angle.

### English

Hello. Please help me with a few questions. 1) Which is the correct position of "again" in the sentence: "They have (again)gathered (again)at the square (again)"? 2)Does the phrase "the allegations doubt his integrity" have the same meaning as "the allegations question his ...

### Algebra

I am stuck, pleas help, i have the example but I am still not able to figure it out... Find the value of X...5/x+6+2/x^2+7x+6=3/X+1 Find the value of X...2/5=x-2/20 First, get the X terms on one side of the equation and the numbers on the other. 2/5=X-2/20 2/5+2/20 = X Change ...

### rate law chem

can rate law concentrations on opposite sides of the equation cancel? Say you have ethanol on the right side of an equation and it comes up again in another equation but on the left, do they cancel?

### Chemistry

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again.

### Math

What is an example of an equation for Celsius to Fahrenheit? I completely forgot the equation since i spend too much time doing summer things, but this is for Summer School, Please help me understand it again.

### Summer School Calculus

Another one for you :P, add these two vectors using trigonometry (again)... 9N[S2W] and 11N[N31W]...Again, I am confused about the angles, I am not sure what value I should use for the cosine and sine law. THANKS AGAIN!!

### chemistry f/u

Thank you Mr. bobpursley. I am still unclear on a few things. massethanol*Ceth(Tf-7.7)+masswater*Cwater*(Tf-27.1)=0 solve for Tf 17.75g ethanol x(Tf-7.7)+31.6g water x (Tf-27.1)=0 This is the algebra that I do not know how to derive to move to the next step. Do I add it all to...

### chemistry

I saw a girl by the name of Abgail ask the same question !! So I'll ask you again!! help me and also her!! What is the chemical equation for: 1. Cyclohexane and Potassium Manganate VII 2. Cyclohexen and Potassium Manganate VII

### CHEMISTRY

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again. Response Al2(SO4)3 + 3ZnCl2 ---> 2AlCl3 + ?___ZnSO4 Why do you have "?____" before the ZnSO4?

### Help w/this one again(Math!!)

Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. Two cars leave town going in opposite directions. The car heading north travels at 55 mph. The car heading south travels at 75 mph. How long will it take them to get 715 ...

### English

1. Can we meet again one day? 2. Can we meet again oneday? 3. Can we meet again some day? 4. Can we meet again someday? (Which ones are grammatical? Which one is commonly used? Thank you. Have a good day!)

### Last equation question

where would I graph this?? once again I hate fractions and equations... graph the equation x=7/2 can someone help me figure this out thanks last question of the day..

### math (other one is wrong equation)

sorry, i posted the wrong equation in the other message 5^(x+3)-5^(x+2)=4 again, i know the answer is x = -2, but i'm not sure how to get there in steps.

### DRWLS CAN YOU ANSWER

How do i solve inequalitites with three variables. I still can't figure it outplease help. x+y=1 y-z=-3 2x+3y+z=1 THE ANSWERS ARE3,-2,1 HOW DID THEY GET THAT ANSWER. This can be solved a number of ways. 1) subsitition 2) determinants 3) matricies. Substution: x= 1-y y= z+3 or ...

### Chemistry

Is the following a properly written thermochemical equation? 2C8H18 + 25O2 → 16CO2 + 18H2O, ΔH = –5,471 kJ/mol No, the equation does not list the enthalpy of reaction. Yes, the equation is correct. No, the equation does not list the states of each substance. No, the ...

### algebra

I made a typing error on last post so I thought I would try again . thanks for your help. Use the percent equation to answer the following. solve the percent equation for b. percent equation is a= p% . b i saw in text it set up as cross products a/b = p/100. I thought about ...

### geometry again again again

Two angles are supplementary. one angle measures 12 degrees more than the other. Find the measures of the angles.

### algebra again

Write an equation that passes through the points (4, 3) and (2, -2) I have -2 -3 is -5 and 2-4 is -2 so y equals -5/2x plus b. I put in 2,-2 into the equation to get the y intercept, so 2 equals -5/2 times 2 plus b -5/2(2) is -10/-4 reduce to -5/-2 Now add 5/2 to -2 Please ...

### Chemistry

What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? (assume constant temprature and pressure) Balanced equation- N2 + 3H2= 2NH3 After finding this answer, what volum of ammonia is produced in this reaction? 1. Write the equation. You ...

### Help again...Math!!

Two cars leave town going in the same direction. One travels 55 mph and the other travels 65 mph How long will it take before they are 180 miles apart? Hint: We do know that one car is 180 miles ahead of the other, so the slow car's distance can be represented by " d " and the...

### ALGEBRA again still need help !

need help solving this word problem, converting from words to an equation 48 equals a number increased by 6, and the sum, all multiplied by 5. I have the answer, but I am unable to set up an equation. answer - x=3 3/5

### Calculus again

Find the equation of the tangent to y=2-xe^x at the point where x=0 So I found the first derivative by doing the sum rule and product rule. I got e^(x)(x-1) Then I found the slope by substituting 0 for x and got -1. Then I found y by substituting 0 into the original equation ...

### Chemistry

So I thought i finally had figured out how to balance these equations but now this one with the formula in it has confused me again. Can you help with the next steps in balancing this equation? Maybe if I can get the answer to this one I can complete my other questions. O3 + H...

### Algebra 2 (again)

Find the value of y for which the equation below is true. |2x| |y + 7| |x | = |7 - 3y| 3, -3, 1, or 4

### word problem

In 1994 the moose population in a park was measured to be 6400. By 1996, the population was measured again to be 6800. If the population continues to change linearly: Find an equation for the moose population, y,in terms of x, the years since 1994. Ive been helped on getting ...

### math

Let F1=(-6,0) ,F2=(6,0) A=(10,0)64 + and B=(-10,0) write an equation of the set of all points p(x,y) such that (PF1/pluse /PF2/=20. now i know the problem is the square root of (x+6)^2 +y^2 + the square root of (x - 6)^2 + y^2 = 20 and the anserew is x^2/100 + y^2/64=1. i am ...

### Please check my maths?

How should i do this question?? it says: find the equation of the tangent to the curve y=(x-2)^3 at the point (3,1). calculate the coordinates of the point where this tangent meets the curve again. I know how to get the first part, if i'm not wrong, it's y = 3x - 8 but no ...

### Chemistry

What will be the pH of an aqueous solution containing 0.040 mol/L sodium hydroxide?? I got 1.40 or 1.398 I rounded the numbers is my answer right??? If not what's the right answer?? I know I wrote the question again, because on the previous answer I did not understand what u ...

### CHEMISTRY

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again. Responses Al2(SO4)3 + 3ZnCl2 ---> 2AlCl3 + ?___ZnSO4 What is your thinking? What goes in ...

### differential equation

dy/dx=x+y, y(0)=1 How do I solve for y(x)? I know the answer is y(x)=2e^x-x-1, but I forgot how to do these kinds of problems again.

### Algebra 1

A design calls for a rectangular garden with an area of 180 square feet. If the length is to be 3 feet more than the width, set up an equation and solve that equation to find the dimensions of the garden. I drew a sketch and labeled the width "w" and the length "w+3" my ...

### Physics

Stuck again. The paper just says that the position of an object is given by s(t)=t^3. When T=5sec find A. Position B. Velocity C. Acceleration I'm trying to use the "position equation" which is s=1/2 a t^2 = Vot However, what do I solve the equation for? It seems like none of ...

### Algebra

Hi again. I am supposed to graph y+3=-1/12(x-1)^2. How do I find the equation of the directrix, and the coordinates of the vertex and the focus?

### Math

Hello again! I would appreciate help very much on this. Thank you! 1) For which values of x is y equal to 16 in the equation y=|3x+4|? A) -60 and 36 B) -36 and 60 C) -20/3 and 4 D) 20/3 and 4

### Chemistry (pleas help!)

a stressed chemistry student is hyperventilating into a paper bag. The student stops to wip his brow after a few breaths, and the bag is at 5.7 KPa and the temperature in the lecture hall is 24 degrees C. The bag is 0.75 L full. The student then goes at it again, and ...

### Algabra!!!

ok i asked 4 help earlear ang got it but now im stuck again (2,5) M=1/2 the book says to "write an equation of the line that passws through the point and has the given slope. write the equation in slope-intercept form." but how do i do this with a fraction the book dose not ...

### calculus, again

Hey can you help me find the exact value of x in the equation 5^2x=3^(x+1)? Thanks a lot, this website is cool and helpful!

### Geometry

Given: 7x + 2 = 2 + 5x – 6 Prove: x = –3 Given the equation 7x + 2 = 2 + 5x – 6, use the commutative property to rearrange the terms so that like terms are next to one another. This gives the equation 7x + 2 = 2 – 6 + 5x. Then, use the ____________________ to group the...

### Chemistry

This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients possible. Indicate the ...

### Chemistry

This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients possible. Indicate the ...

### AP Chemistry

What is meant by minimum and maximum energy problems. Are there different equations to find them. What does this conceptually mean? * This is dealing with quantum chemistry such as plancks equation, and debroglie equation.

### Chemistry(Please check)

. Ksp for Fe(IO3)3 is 10-14. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 10-4M and [IO3-] = 10-5M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would you agree? ...

### physics Again

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks

### Chemistry

Use oxidation numbers to identify reaction is REDOX reactions. a. 2SO2(g) + O2(g) -> 2SO2(g) for 2SO2 I got: -2 for S, -2 for O for O2 I got 0 for 2SO2 I got -2 for S again, and -2 again for 0 Therefore I lost one oxygen and a REDOX reaction occured Am I right?????

### Algebra2 again

How do you: Complete the square as an aid in graphing. [I put exponents in ().] y = x(2) + 4x - 2 Please Help? The complete square of the x^2 binomial is x^2 + 4x + 4 = (x+2)^2 Therefore, add 6 to each side of the equation and you will have this still-valid equation with a ...

### English

They are arguing about rules and regulations again. I have to identify the adverb. again

### chemistry

Please help with this problem =) The combustion of liquid chloroethylene, C2H3Cl, yields carbon dioxide, steam, and hydrogen chloride gas. I. write a balanced equation for the reaction (I sorta get this part) II. How many moles of oxygen are required to react with 35.00g of ...

### calculus hs

Here's the question again How do I find all line through (6, -1) for which the product of x- & y- intercepts is 3? Thanks again

### Chemistry

91.7g of HCL solution was added to the calorimeter and brought to a constant temp. Then 0.5278g of MgO was added and the Temp rose from 25.65C to 32.60C and held steady. Then 0.0185g of Mg was added and the temp again rose from 30.35C to 32.20C. Calculate the Cp for the ...

### Chemistry Dr. BOB

I don't get it!! In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i ...

### Animal Physiology-Membrane Potential

Intracellular Extracellular Na+ 12 mM 160 mM Cl- 7 mM 110 mM K+ 140 mM 5 mM 1.How do you calculate the equilibrium potential for potassium, K+, under these conditions? 2. Assuming that Na+ is the only ion the plasma membrane of this cell is permeable to, at what voltage will ...

### Math

I came up with no solution for this equation. Could someone please let me know if I am correct? If not, I will try again, but I have already tried it 3 times. [x/(x+5)]-[5/(x-5)]=(x^2+25)/(x^2-25)

### Calculus

So, yet again, I am confused! State whether or not the following statements are true. Justify your reasoning. a). a• ( b+c ) = a• b + a • c b.) a × ( b+c ) = a × b + a × c c.) a × ( b•c ) = a × b • a × c Thanks, again!

### French for Anonymous to Sra

its me again could u please tell me how to say by: to: due: I need it for my title page thanks again:)

### science

Me again :) Why might a car manufacturer change the shape of the side mirrors on a particular model? Thanks again.

### chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### chemistry help!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### chemistry help!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### Chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### CHEMISTRY!!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### chemistry help!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### CHEMISTRY!!!!

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### Chemistry

In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think it's C2H6OH...

### Chemistry

I am having a bit of difficulty getting the net equation and the net ionic equation and the net ionic equation. I think I have the balance equation right. Thanks in advance for any help. For the acid base neutralization reaction of carbonic acid, H2CO3(aq), and lithium ...

### Chemistry

For the equation give the formula equation, ionic equation, and the net ionic equation after predicting the products and balancing. Using the solubility rules to indicate solid or aqueous each formula. AgNO3 + NaCl

### chemistry

write the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrochloric acid. Formula equation.............. net equation.............

### chemistry

wich of the following shows the correct terms for the two sides of a chemical equation correctly placed to the left or right where thay belong an also shows the correct symbol reactants---products products=reactants reactants=sum or sum----reactants please help again lol

### vocab, again! sorry!

Hi, again. I need help with this word decorum. the def is ADJ proper; seemly correct how do i use this in a sentence?

### Math/modelling

Hi, I have a linear model with equation p =5.1t - 28, which concerns breeding pairs of birds where p is the number of breeding pairs and t is the year. I need to use this model to estimate the number of breeding pairs in year 15. I would assume to do this I just need to insert...

### Chemistry

Our professor just told us that the final exam will be the ACS exam, we are taking general Chemistry II. What is the best way to study for ir? Is the preparing for ACS general chemistry study guide good? If we are taking general Chemistry II do we have to study Chemistry I again?

### Chemistry

Our professor just told us that the final exam will be the ACS exam, we are taking general Chemistry II. What is the best way to study for ir? Is the preparing for ACS general chemistry study guide good? If we are taking general Chemistry II do we have to study Chemistry I again?

### chemistry

How do you calculate molar mass again?

### ALGEBRA again !

need help solving this word problem, converting from words to an equation 48 equals a number increased by 6, and the sum, all multiplied by 5.

### Help!Math...Again!!!PLease Help!

Two cars leave town going in the same direction. One travels 55 mph and the other travels 65 mph How long will it take before they are 180 miles apart? Hint: We do know that one car is 180 miles ahead of the other, so the slow car's distance can be represented by " d " and the...

### chemistry(balance equation)

hi!i am a f4 student in hk.i have know the basic concept of balance equation.but some too complex equation i cant balance.is there any general short cut for balancing any simple or complex chemical equation?

### algebra 1

Write the equation for the line that passes through the point (6,7) and has a slope of 1/2. Give as a simplified fraction. Again, I have y equals 1/2x but not sure for the rest.

### chemistry Dr BOB

is this right? C2H6O + 3O2 = 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with ...

### Algebra2?????

What would be the missing piece of information given the following information: Find the equation of the line that passes through the points (3, -1) and (2, 5). y = -6x + ? 17 15 20 11 Good. Try this one just like we did the last one...let me know how you do! is it...15? nope...

### Chemistry

The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2+ (aq, 0.100 M)||Zn2+ (aq, ____ M)|Zn(s) is 24.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode. Hi, I posted this question awhile back but I think it got drowned out so I...

### Chemistry

Write a balanced chemical equation (molecular equation). Write a total ionic equation. write a net ionic equation. (NH4)2 SO4(aq)+Na2CO3(aq) -->

### chemistry

write the balanced molecular equation, the complete ionic equation and the net ionic equation. copper(2) sulfate and 10% sodium hydroxide

### Chemistry

Write the molecular equation, the complete ionic equation, and the net ionic equation for the reaction of barium hydroxide with sodium nitrate.

### Chem(again)

Can someone tell me the equation for converting Celcius temperatures to Kelvin temperatures? Thanks K = 273.15 + C

### Algebra 1

what is the y-intercept and x-intercept for the equation -4x+y=14? Thank you. I stayed up late, but I still can't figure this out. Please help! Thank you, again.

### College Chemistry

I balanced the equation: HBr(aq) +NH3(aq)->NH4Br I need to find the ionic equation and the net ionic equation

### chemistry

Write a balanced equation, ionic equation and the net ionic equation for the following: A) Li2SO4 + Sr(NO3)3 ---> B) H2SO4 + Na2CO3 --->

### chemistry

What is the percent ionization of a 1.38 mol/L weak acid if its Ka = 2.7 x 10^-6? Thanks again!