Tuesday

October 6, 2015
Total # Posts: 465

**APChemistry**

If you have CL2 + H2o ---> H+ + Cl- + HOCl and you are given [HOCl] = 0.06 M and you have to find pH.... can you assume that [HOCl] =[H+] = 0.06 M since H+ and HOCl both have a coefficient of 1? Thank you
*April 18, 2010*

**APChemistry**

If you have CL2 + H2o ---> H+ + Cl- + HOCl and you are given [HOCl] = 0.06 M and you have to find pH.... can you assume that [HOCl] =[H+] = 0.06 M since H+ and HOCl both have a coefficient of 1? Thank you
*April 18, 2010*

**APChemistry**

So if I can't assume that, then how can I calclate pH? I dont know K value, so I can't use Henderson Hasselbalc...
*April 18, 2010*

**APChemistry**

If you have CL2 + H2o ---> H+ + Cl- + HOCl and you are given [HOCl] = 0.06 M and you have to find pH.... can you assume that [HOCl] =[H+] = 0.06 M since H+ and HOCl both have a coefficient of 1? Thank you
*April 18, 2010*

**APChemistry**

Hi If I had 40 mL of 0.1 M HOBr and mixed that with 10 mL of 0.5 M Ca(OH)2 how would I go about calclating the pH? (i don't know if titration is right because equivalence, halfway pts, etc.. are not specified).. Thank you very much.
*April 18, 2010*

**APChemistry**

wait, if you have "NaOBr(s) + H2O ==> NaOH + HBr and the net ionic equation is OBr^- + HOH ==> HOBr + OH^- " why doesn't this: NaOBr(s) + H2O ==> NaOH + HBr become this: Na+ + OBr- + H2O ==> Na+ + OH- + H+ + Br- which would become OBr- + H2O ==> OH...
*April 18, 2010*

**APChemistry**

thank you
*April 18, 2010*

**APChemistry**

Hi What is the netionicequation for NaOBr disolving in watr? Thanks!
*April 18, 2010*

**math-DUE TONIGHT PLEASE HELP**

can you help me get started please? I dont know where to begin
*April 12, 2010*

**math-DUE TONIGHT PLEASE HELP**

A shoe store carries one brand of shoe in 3 styles, 5 sizes, and 4 colors. How many different shoes are available for this one brand?
*April 12, 2010*

**math**

Consider the experiment of rolling a single die. Find the probability of the event described. What is the probability of rolling a number less than or equal to 4?
*April 12, 2010*

**math-DUE TONIGHT PLEASE HELP**

The mean height of 5 students is 61.8. If one of the students leaves, the mean height becomes 60. What is the height of the absent student?
*April 12, 2010*

**math**

Attendance records at a school show the number of days each student was absent during the year. The days absent for each student were as follows: 8 2 4 3 2 7 6 0 9 3 3 4 2 4 6 Create a dot plot for this data
*April 11, 2010*

**math-please help due tonight**

If P (A) = 2/3, P (B) = 1/6, and P (A and B) = 0 what can you say about P (A or B)?
*April 7, 2010*

**math-PLEASE HELP**

consider a bowl containing 36 different slipsof paper. Ten of the slips of paper each contain one of the set of digits0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. Determine the probabilities of the events specified. Drawing one slip, what is P (...
*April 7, 2010*

**math157-PLEASE HELP**

When the median and mean are substantially different, what does that tell you about the data?
*March 30, 2010*

**apchemistry**

Hi Please double check me: I had to state whether the process forms a voltaic or eletrolytic cell: YOu plug in your MP3 player to charge the nickel-cadmium battery (I said electrolytic)??? The radio plays in your car even though the engine is not running. (I said voltaic???) ...
*March 30, 2010*

**apcehmistry**

A thin metal sheet is composed of Fe and Co How do you ionize Fe to Fe2+ but not ionize Co ? I tiried using the activity series of metals, but Fe is above Co, so anything that would ionize Fe would also ionize Co right? So what JUST ionizes Fe but not Co? Thaak you
*March 30, 2010*

**apchemistry**

thank you--also, does this work for the Fe iron part of the question too?
*March 29, 2010*

**apchemistry**

a thin metal sheet is compposed of Fe and Cobalt You would like to recover the Cobalt What oxidizing agent(s) would allow you to ionize Fe to Fe2+ but not ionize Co?
*March 29, 2010*

**apchemistry**

PartA Suppose you had a solution containing Pb2+ and Tl+ and wanted to convert the lead to solid metal but leave the Tl+ in solutin. What reducing agent(s) would be able to drive the reaction?
*March 29, 2010*

**apchemistry**

I tried to figure this out with my standard reduction potentials sheet, and tried to find a sulfate ion for the first part, but I don't think that is the answer...any help is much appreciated
*March 29, 2010*

**math**

Grade Frequency A 2 B 8 C 11 D 2 F 1 how would this graph change if there were twice as many grades?
*March 29, 2010*

**math**

The following data set gives the difference between the winning and losing scores in 50 randomly observed highschool basketball games: 2, 12, 1, 2, 12, 5, 14, 2, 45, 9, 1, 8, 18, 28, 9, 4, 30, 16,4, 12, 8, 13, 20, 9, 17, 13, 49, 17, 13, 4, 14, 2, 12, 29, 8,9, 11, 4, 6, 22, 4, ...
*March 29, 2010*

**Math- CAN SOMEONE PLEASE CHECK MY WORK?**

7x+5y=-26 x=28-6y solve using substitution okay so then 196-42y+5y=-26 then combined like terms so 196+37y=-26 37y=-222 y=-6 is this part correct?
*March 28, 2010*

**math-word problem- PLEASE CHECK MY ANSWER**

Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time will train B catch ...
*March 28, 2010*

**math- system**

x+5y=4 x=7-5y give the ordered pair
*March 28, 2010*

**math-word problem-please help**

Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time will train B catch ...
*March 28, 2010*

**math-slope**

f(x)=-2x-3 Find the slope and the y intercept
*March 28, 2010*

**math-graphing**

y>-5 x>6 How would I get ordered pairs to graph this?
*March 28, 2010*

**math-graphing**

How would I graph the equation y=6?
*March 28, 2010*

**math**

x+2y=4 Find the ordered pairs would this be (0,2) and (4,0)?
*March 28, 2010*

**math-please help due tonight**

find the two ordered pairs from this equation. y+x=-2 then give the ordered pair of the y intercept?
*March 28, 2010*

**math- CAN SOMEONE PLEASE HELP**

find the two ordered pairs of this equation. y=5/3x+8 then give the slope and y intercept. I know the slope is rise over run and is the y intercept 8? This is the answer I got but I am still really confused how do I get my two ordered pairs this makes no sense to me! Your Y-...
*March 28, 2010*

**math**

Find the two ordered pairs using this equation- x+3y=6
*March 28, 2010*

**math substitution method**

okay so then 196-42y+5y=-26 then combined like terms so 196+37y=-26 37y=-222 y=-6 is this part correct?
*March 28, 2010*

**math substitution method**

use the substitution method to solve 7x+5y=-26 x=28-6y
*March 28, 2010*

**math- like terms**

collect like terms 10c+5d-5c-8d= 5c+3d? is this correct?
*March 28, 2010*

**math**

find the two ordered pairs from this equation. y+x=-2 then give the ordered pair of the y intercept?
*March 28, 2010*

**math-word problem**

Amy paid $53.74 for a pair of running shoesduring a 15% off sale. what was the regular price?
*March 28, 2010*

**math-word problem**

Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time will train B catch ...
*March 28, 2010*

**math-slope and y intercept**

find the two ordered pairs of this equation. y=5/3x+8 then give the slope and y intercept. I know the slope is rise over run and is the y intercept 8?
*March 28, 2010*

**math**

Thanks Reiny
*March 28, 2010*

**math**

6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions These points would have C correct?
*March 28, 2010*

**math- CAN SOMEONE PLEASE CHECK MY WORK**

In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992. Fill in the linear function E(t) that fits the data E(t)=____t+____ uses this to ...
*March 28, 2010*

**math-slope**

would the slope of (0,3) and (-6,-3) be -6/-6?
*March 28, 2010*

**math**

Can someone help me find the two order pairs of this problem.. 5x+6y<30 I have to graph but I am unsure how to find the ordered pairs
*March 28, 2010*

**math**

5x+2y=8 2x+5y=1 is this parallel, perpendicular or niether?
*March 27, 2010*

**math**

I know that is why the question confuses me so the answer is c/9=d?
*March 27, 2010*

**math**

but you dont have C so how do you solve for D?
*March 27, 2010*

**math**

Solve for the indicated letter c=9d, for d I am not sure I understand this question can someone help
*March 27, 2010*

**Math**

Solve 9(w-2)=-18 9w-18=-18 9w=0 w=0 Is this correct?
*March 27, 2010*

**math-multiplying**

3/1 * (6/5) = 3 and 3/5 is this the correct answer?
*March 27, 2010*

**math**

6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions
*March 27, 2010*

**math-word problem**

Media Services charge $20 for a phone and $30/month for its economy plan. The equation C=30t +20 describes the total cost, C of operating a media service phone for t months. The total cost for 10 months of service is... My answer is $320 for 10 months service...is this correct...
*March 27, 2010*

**Math**

Can someone help me solve 0.7x+7<1.5x-8
*March 27, 2010*

**Math **

Thank you for your help!
*March 27, 2010*

**Math **

from here would you combined 4x-10x=-6x then it would show x=5+-6x and then you would go +6 to both sides to get 6x=5 and then divide to get your answer would this be correct?
*March 27, 2010*

**Math **

Solve 5/2X + 1/4X = 5/4 +X
*March 27, 2010*

**math**

solve the compound inequality 4>-2x+3 or 12<-2x+5
*March 27, 2010*

**math**

50% of what number is 35 would the answer be .50N=35?
*March 27, 2010*

**math-word problem**

In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992. Fill in the linear function E(t) that fits the data E(t)=____t+____ uses this to ...
*March 27, 2010*

**math-elimination**

I am still very confused on how to find the ordered pairs and I guess I do not understand what you are saying.
*March 27, 2010*

**math-elimination**

solve using the elimination method but I do not know where to begin
*March 27, 2010*

**math-elimination**

3x+4y=5 6x+8y=10
*March 27, 2010*

**math--simplify**

Simplify -9[-15-(45-12)]=
*March 27, 2010*

**math-word problem**

To find the slope would it then be 75.7-73.5/73.5 so the slope would be 33.4?
*March 27, 2010*

**math-word problem**

In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992. Fill in the linear function E(t) that fits the data E(t)=____t+____ uses this to ...
*March 27, 2010*

**math**

The equation y = -1777x+27153 can be used to predict the number y of gun deaths in the United States x years after 20000, that is, x=0 corresponds to 2000, x=3 corresponds to 2003, x=5 corrresponds to 2005 and so on. Predict the number of gun deaths in 2005 and 2007. In what ...
*March 27, 2010*

**math**

Finding the domain of G(X)=4/4-3X So would the domain be 3 then?
*March 26, 2010*

**math**

The function H descibed by H(X)=2.75X+71.48 can be used to predict the height, in centimeters, of a woman whose humerus (the bone from the elbow to the shoulder) is x cm long. Predict the height of a woman whose humerus is 39 cm long. I have an answer of the height is 178.73 ...
*March 25, 2010*

**math -word problem**

The width of a recangle is fixed at 13cm. What Length will make the perimeter greater than 78cm?
*March 25, 2010*

**Math**

So is that what the net yardage would be gains?
*March 25, 2010*

**Math**

On three consecutive passes a football team gains 7 yards, loses 34 yards and gains 24 yards. What number represents the total net yardage? For this would I just add 7+34+24 or is there a formula I should use?
*March 25, 2010*

**math**

Finding the domain of G(X)=4/4-3X Unsure where to begin here
*March 25, 2010*

**Math 116**

Find the slope =, if it exists, of the line containing the pair of points (7,10) and (9,-1)
*March 25, 2010*

**math**

x=8 correct?
*March 24, 2010*

**math**

Please help me solve. 8x-(2x+5)=43
*March 24, 2010*

**Math **

Translate to an algebraic expression The product of 46% and some number. use D for some number and change the percentage to a decimal. Here is what I think it is .46D is that correct?
*March 24, 2010*

**math**

-8<3x-5<-4 unsure how to solve can someone please give me the steps?
*March 23, 2010*

**math**

Evaluate r+s/8 for r=20 and s = 20 20+20/8 40/8 answer is 5 is this correct?
*March 23, 2010*

**math**

thanks
*March 23, 2010*

**math**

Find the slope of x=-6 unsure where to start here can someone please help?
*March 23, 2010*

**MATH - Can someone please help!**

Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) The sales representative informs you that there are two floor plans still available, and that there are a total of 70 houses available. Use x ...
*March 22, 2010*

**Math 116**

Okay so now I am working on the substitiution portion of this assignment and I understand the first part by not the second can someone help? Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) ...
*March 22, 2010*

**Math 116**

heres what I think the answer is please tell me if I am correct A)x+y=30 B)I get stuck at costs for homes and elimination method
*March 21, 2010*

**Math 116**

As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a) The sales representative here tells you they also have two floor plans available, but they only have 30 homes available. ...
*March 21, 2010*

**APChem**

Hi I tried to understand this but I don't know why the answer is B: Which one of the following pairs cannot be mixed together to form a buffer solution: A) NaC2H3O2, HCl B)RbOH, HBr C) NH3, NH4Cl D) H3PO4, KH2PO4 E) KOH, HF The answer is B but could you explain why? I know...
*March 21, 2010*

**APChem**

Hi! Thank you for your help... A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 66.2 mL of KOH is ______M. (The answer is supposed to be 1.00X10^-7) How do I set this problem up? I realize that it is a ...
*March 21, 2010*

**ap chemistry**

can you help: "Explain why there are no geometric isomers of tetrahedral complexes. thank you
*March 17, 2010*

**APChem**

"The osmotic pressure of a saturated solution of strontium sulfate at 25C is 21 torr. What is the solubility product of this salt at 25C (Hint: calculate molarity from the colligative properties eqn of osmotic pressure and use it in the equilibrium expression" I ...
*March 17, 2010*

**APCHEm urgent!!!!!!**

Hi thank you so much!!!! What is a net ionic equation for the reaction of H+ with Cu(NH3)4 ^2+ ALSO what is the net ionic equation for the reaction of H+ with Hg2Cl2 Does the H+ addition increase, decrease, or has no impact on the solubility of the salt.?
*March 15, 2010*

**APChem**

If an air bubble passes unnoticed through the tip of a buret during a titration (where a weak nonvolatile acid HA is the analyte) , the calculated molar mass of HA would be too high, too low, or not affected? I thought it would be too high, since an air bubble in the buret ...
*March 7, 2010*

**APChem**

thank you!
*March 7, 2010*

**APChem**

Is this true or false?:A buffer can be destroyed by adding too much strong acid. I thought that a buffer can be destroyed by adding too much weak acid, but I'm not sure...
*March 7, 2010*

**APChem**

does anyone know a good website i could look at so i could answer this question: ? Explain how indicators work using a chemical reaction as part of your explanation. Any websites? please? thank you!!
*February 27, 2010*

**APChem**

Hi Does red cabbage contain one or many anthocyanins & how do you know? this really helps--thank you!
*February 27, 2010*

**Math**

{-5x+3y=10 is this bracket { significant? how can the answer be (-2,-4)?---> try plugging in(-2,-4) for (x,y) in the first equation: -5 (-2) + 3(-4) = 10 10-12 = 10 ----> this doesn't make sense i would do this: x-4y=14 so... x = 4y +14 -5 (4y +14) + 3y = 10 -20y - ...
*February 26, 2010*

**Honors Chemistry**

Does red cabbage contain one or many anthocyanins? How do you know this?
*February 25, 2010*

**chemistry**

What is the molecular structure of the molecule AlCl3? What characteristic is notable about the structure that helps us to understand the acidic nature of AlCl3?Write a chemical reaction between AlCl3 and NH3 ignoring any reaction between AlCl3 and the solvent. Show and name ...
*February 23, 2010*