# Posts by Kiki

Total # Posts: 563

**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.

**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...

**APChemistry**

thank you

**APChemistry**

Hi What is the netionicequation for NaOBr disolving in watr? Thanks!

**math-DUE TONIGHT PLEASE HELP**

can you help me get started please? I don't know where to begin

**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?

**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?

**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?

**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

**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)?

**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 (...

**math157-PLEASE HELP**

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

**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???) ...

**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

**apchemistry**

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

**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?

**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?

**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

**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?

**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, ...

**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?

**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 ...

**math- system**

x+5y=4 x=7-5y give the ordered pair

**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 ...

**math-slope**

f(x)=-2x-3 Find the slope and the y intercept

**math-graphing**

y>-5 x>6 How would I get ordered pairs to graph this?

**math-graphing**

How would I graph the equation y=6?

**math**

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

**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?

**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-...

**math**

Find the two ordered pairs using this equation- x+3y=6

**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?

**math substitution method**

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

**math- like terms**

collect like terms 10c+5d-5c-8d= 5c+3d? is this correct?

**math**

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

**math-word problem**

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

**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 ...

**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?

**math**

Thanks Reiny

**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?

**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 ...

**math-slope**

would the slope of (0,3) and (-6,-3) be -6/-6?

**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

**math**

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

**math**

I know that is why the question confuses me so the answer is c/9=d?

**math**

but you don't have C so how do you solve for D?

**math**

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

**Math**

Solve 9(w-2)=-18 9w-18=-18 9w=0 w=0 Is this correct?

**math-multiplying**

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

**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

**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...

**Math**

Can someone help me solve 0.7x+7<1.5x-8

**Math**

Thank you for your help!

**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?

**Math**

Solve 5/2X + 1/4X = 5/4 +X

**math**

solve the compound inequality 4>-2x+3 or 12<-2x+5

**math**

50% of what number is 35 would the answer be .50N=35?

**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 ...

**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.

**math-elimination**

solve using the elimination method but I do not know where to begin

**math-elimination**

3x+4y=5 6x+8y=10

**math--simplify**

Simplify -9[-15-(45-12)]=

**math-word problem**

To find the slope would it then be 75.7-73.5/73.5 so the slope would be 33.4?

**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 ...

**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 ...

**math**

Finding the domain of G(X)=4/4-3X So would the domain be 3 then?

**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 ...

**math -word problem**

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

**Math**

So is that what the net yardage would be gains?

**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?

**math**

Finding the domain of G(X)=4/4-3X Unsure where to begin here

**Math 116**

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

**math**

x=8 correct?

**math**

Please help me solve. 8x-(2x+5)=43

**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?

**math**

-8<3x-5<-4 unsure how to solve can someone please give me the steps?

**math**

Evaluate r+s/8 for r=20 and s = 20 20+20/8 40/8 answer is 5 is this correct?

**math**

thanks

**math**

Find the slope of x=-6 unsure where to start here can someone please help?

**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 ...

**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) ...

**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

**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. ...

**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...

**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 ...

**ap chemistry**

can you help: "Explain why there are no geometric isomers of tetrahedral complexes. thank you

**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 ...

**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.?

**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 ...

**APChem**

thank you!

**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...

**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!!

**APChem**

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

**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 - ...

**Honors Chemistry**

Does red cabbage contain one or many anthocyanins? How do you know this?

**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 ...

**Gen Chem II**

How many mL of 0.0875 M H2SO4 would you need to exactly neutralize 50.00 mL of 0.135 M NaOH?

**us history**

Given the global political, economic, and cultural dominance of the U.S. after World War II to the present, characterize the position of the U.S. in terms of both positive and negative impacts on the world's developing nations.

**coding and billing**

I just realize I do not have the correct coding book to do a brief look up codes worksheet. I need help!!!!

**math/probability**

A bag contains 7 red chips and 10 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that both chips are red?