# Chemistry(I'm sooo confused here!)

72,074 results

### Chemistry

I am sooo confused on how to solve this problem, can anyone help me understand? calculate the pH of 0.10 M HCI solution?

### Chemistry(I'm sooo confused here!)

The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e) 91 nm I know i posted ...

### college algebra

Solve the following inequality. x^3+9x^2-108 less or equal to 0. Then write your solution in interval notation. I am sooo confused and do not have any idea how to do this. Can someone please show me step by step please??? Thanks in advance. Someone who is confused.

### COLLEGE HELP LEASE PLEASE !!!!!!!

Is graduate tuition is tuition for graduate school? I want to become a nurse. Graduate tuition Nursing \$828.00 per credit But here the tuition is \$17,166 The annual total list price cost to go to Mercy was \$31,928 I'm sooo confused please help. Does it cost more than \$31,928?

### math

i also have a math test tomorrow and i get sooo confused with irregular shapes in geometry

### math 2 questions this time

Find the area of the parallelogram. A height of 8 and a base of 24 then there is a another number I think its length but its 8 and im confused because its B*H for parallelogram sooo yea can someone help me and show me how. thanks. what is the surface area of the prism? There ...

Sooo this isn't really a question about something in school or anything, but I was wondering, how many Connections Academy student really go on here ( Whether its to cheat or not [We don" cheat shame here] )

### Geometry

Points EC bisects points AD at C. For each of the following, find the value of 'x' and the measure of the indicated segment. Please correct me if I'm wrong! 1. AC= 3x+6 and CD=2x+14 x=_______ AC=______ Answer: x=8 AC= 30 2. AC= 5x-8 and CD=16-3x x=______ AD=_____ Answer: x=3 ...

### Quick math help

Points EC bisects points AD at C. For each of the following, find the value of 'x' and the measure of the indicated segment. Please correct me if I'm wrong! 1. AC= 3x+6 and CD=2x+14 x=_______ AC=______ Answer: x=8 AC= 30 2. AC= 5x-8 and CD=16-3x x=______ AD=_____ Answer: x=3 ...

### Chem

balance the half-reaction. (Type your answer using the format CO2 for CO2, [NH4]+ for NH4+, and [Mg]2+ for Mg2+. Use the lowest possible coefficients.) I am sooo confused (a) S(s) --> H2S(g) thanks

### ALGEBRA

How do i do this?? i am sooo confused. can someone please help me?? Janet, Chrissy, and Jack want to divide their grocery bill evenly. They bouoght a apples for 90 cents each, b bananas for 60 cents each, and c cantelopes for \$2.10 each. Write and simplify and expression ...

### Chemistry :(

Given that: 2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821 kJ/mol Calculate the standard enthalpy change for the following reaction: 2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s) _______kJ PLEASE EXPLAIN IM SOOO ...

### math

one third of the people in a convention room are seated in three-fourths of the chairs. THe rest of the people in the room decide to stand. If there are 8 empty chairs, how many people are standing? Please fully explain because i am sooo confused!!!

### Geometry help

Points EC bisects points AD at C. For each of the following, find the value of 'x' and the measure of the indicated segment. Please correct me if I'm wrong! 1. AC= 3x+6 and CD=2x+14 x=_______ AC=______ Answer: x=8 AC= 30 2. AC= 5x-8 and CD=16-3x x=______ AD=_____ Answer: x=3 ...

### Chemistry

Determine the mass of NH2CH2CO2Na and the volume of 0.150 M HCl solution required to make 1.35 L of a buffer solution at pH=10.75 and at a total concentration of 0.33 M. pKa(NH2CH2CO2H)=9.88. a.Mass of NH2CH2CO2Na: b. Volume of HCl solution: Hi Im sooo confused. 9.88=10.75+log...

### Chemistry

Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted. This question is really confusing me, and I'm not sure where to start. I think I have to calculate the moles of each given reactant first in which case I have: nZn = ...

### MATH! Help sooo confused!

Consider that point A is located at (x, y) in Quadrant I of the coordinate plane. In which quadrant is point B with coordinates (-x, y) located A)Quadrant I B) Quadrant II C) Quadrant III D) Quadrant IV How do I even find this out???

### Chemistry

What's the highest occupied molecular orbital of I-? I'm really confused here, I thought you could only find HOMO for the first two rows of the periodic table.

### Any chance I cud get Dog Training help on here???

If any1 can help me with training my dog that would be FANTASTIC! I know "dog training" isnt a school subject but... i've looked everywhere for help & i cant afford a pro dog trainer. I also cant find any kind of free help..... Thank you SOOO much for ur help on this!

### Algebra

Im sooo confused!! can someone please help me step by step?? In a 4- team tournament, the winner gets 1/2 of the proceeds, the second-place team gets 1/4 of the proceeds, and the remaining proceeds are shared equally among the other two teams. Write the expression that shows ...

### Algebra

Im sooo confused!! can someone please help me step by step?? In a 4- team tournament, the winner gets 1/2 of the proceeds, the second-place team gets 1/4 of the proceeds, and the remaining proceeds are shared equally among the other two teams. Write the expression that shows ...

### US History

kay um. my teacher's not very good at teaching. great guy, but not meant to teach..sooo I have 6 questions that aren't even in the chapter and the index is of no help to me right now... sooo here goes: Describe the basic population structure and social life of the 17th century...

### chemistry

How many milliters of a 6.ooM HCl solution are required to react with 21.0 grams of Mg? I'm so confused. I know how to get the Molar mass of Mg and HCl but, does that even matter here?

### Math

Prove that the following Trigonometric Identity is valid: 1/(sin⁡(y)-1)-1/(sin⁡(y)+1)=-2sec^2 (y) Please any help or clues on how to do this is needed. I have a sheet that tells me valid identities but nowhere on it has info on -2sec^2 (y) I am sooo clueless here :(

### chemistry

the half-life of the reaction, at 34 degrees celsius and Ppan=13.2 torr, is 164.0hr. Calculate the rate constant for the reaction. confused on what to do here

### math

I am supposed to use patterns or linear equation to fill in the graph but I just cant figure this one out.. can someone give me a hint or help me out on this on. p /2/88/8 /10 /? q/22/?/110/110/330 How can I use a linear equation or patterns when each there is not an equal ...

### chemistry

(ppm and ppb are sooo not easy for me to get)c A saturated solution of PbCO3 contains 0.00011 g PbCO3 in 100. g of water. What is this concentration in parts per million?

### Chemistry

Okay, so here's the question: A 60.0 mL sample of 0.100M CH3COOH is titrated with 0.200M? What is the pH at each of the following points... After 30.0 mL of NaOH: This part...I'm getting confused on. I keep getting a number close to 13 and my friend is insisting that the pH is...

### Algebra

I need help with this like really badly sooo yeahhhh:) here it is: Hugo withdrew some money from his bank account. He spent one third of the money for gasoline. Then he spent half of what was left for a haircut. He bought lunch for \$6.55. When he got home,he had \$13.45 left. ...

### Chemistry

I'm so confused!!!!!!!!!! I need to write out the equation for the reaction between (+)-tartaric acid and (+_)-1-phenylethylamine. I know tartaric acid is C4H6O6 and 1-phenylethylamie is C8H11N. Where do I go from here?

### pre calc

I am sooo confused on my homework. #1 Two cars lave an intersection at the same time. One is headed south at a constant speed of 30mph. the other is heading west at a constant speed of 40mph. Build a model that expresses the distance (d) between thec ars as a funtion of time (...

### Chemistry CONFUSED

Ok I'm really confused on the question I asked how many CO2 molecules can be made with 0.500 mol of oxygen atoms. Please help with setting this up

### Chemistry

Help please am kind of confused on this problem, am mostly confused on what state the products will be. Find net ionic equation? 2Al(s)+ 3CuCl3(aq)-> 2AlCl3(?)+ 2Cu(?)

### chemistry

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. I am really confused on how to find t here? Can someone help? I can set up the rest of the equation

### Statistics

Need major help on this one. Sooo confused... Binomial distribution to solve the problems. There is a 60 percent probability that a store will sell one of Red bags to any customer who comes into the shop and views the bags. Out of the next 7 people who come into the shop, what...

### Titrations (chem)

In the titration of a 0.101 M sodium hydroxide solution, 19.02 mL of 0.130 M sulfuric acid solution was required to neutralize the sodium hydroxide in reactions that replace both hydrogen ions of the sulfuric acid. Calculate the number of milliliters of sodium hydroxide ...

### chemistry

so i know that one mole is 6.022*10^23 particles in 12g of a carbon 12 isotope. im confused in finding the amount of moles in a particular substane. there is a formula that determines it, i think its n=m/M, yet im confused with what it means..

### Chemistry

Help please am kind of confused on this problem, am mostly confused on what state the products will be. Find net ionic equation? I BELIEVE ITS BALANCED NOW. 2Al(s)+ 2CuCl3(aq)-> 2AlCl3(?)+ 2Cu(?)

### Geometry

Let B be between C and D. Solve for w CB = 4w - 4 BD = 2w - 8 CD = 24 I'm actually very confused on what to do here.

### Chemistry

What would be the product of a reaction between methanal and pyrrolidine in acid? I know that normally a reaction between a carbonyl and a secondary amine would form an enamine. Here I am confused because there are no hydrogens that can be removed to form the enamine as this ...

### Math

ln(y-9)-ln7=x+lnx Thank you sooo much for helping:))))

### Chemistry

What is the enthalpy change (in kJ/mol) for the following process? Na+(g) + Br-(g) --> NaBr (s) Hint: use the Born-Haber cycle Note: the reference state for Br2 is Br2(l) not Br2(g) Data (in kJ/mol): enthalpy of sublimation of Na(s): 107 standard enthalpy of formation of ...

### Science 8

IN science we are talking about chemical prefixes and compound names. For homework there are some questions where I have to "Name the Ionic Compounds" He talked about it but I am still confused, here is one of the questions. ht tp*:/ / img101.imageshack.us/my. php?image=...

### Math

Solve for y x-2y/5=3(y+2)/4 +3 This is what I did and I don't know if it's right or what to do next. Find the Lcd which is 20. I get: 4x-8y=15y+30=60 I don't know what to do from here. I'm so confused.

### AP English

What did the author intend to do with Adventures of Huckleberry Finn? Keep in mind I mean the AUTHOR (Mark Twain) not Huck...I'm just really confused by this question...I could say, "Write a novel about-insert plot here-. It outlined the values and society of the American ...

### English THE GREAT GATSBY

1. Fitzgerald creates purpose in Chapter 1. What was his purpose and how does he go about doing it? 7. Write a Gatsby-esque sentence. Make it colorful. My sentence is below... does it make sense? Life to some in New York may seem very Gatsbyesque, what with their tall ...

### Chemistry

"Solid dinitrogen pentoxide is added to water." I got this as my answer: N2O5 + H20 -> 2HNO3. Do I need to break 2HNO3 apart since it's a strong acid? I thought it wouldn't since I thought it was a synthesis problem. I read online that this was the answer (N2O5 + H2O ->H...

### are these correct

Here is the questions it says to simplify: xyy^2 x^3 and here is the answer x^4 y^3 ---------------------------- here is another one m^3 pmxm^2 x^3 p^5 and here is the answer m^6 p^6 x^4 ---------------------------- and here is another one xm^2 xm^3 x^3 m and here is the ...

### social studies

I need help checking my question. Explain why the Confederacy spared Washington d.c from being destroyed? my answer. Washington was surrounded by strong fortifications and was filled to the brim with Union troops and because they did it to scare the northerns to make them ...

### Organic Chemistry

I realize this is a general chemistry stoichiometry question, however I can not fully grasp it. I am supposed to calculate the theoretical amount (volume) of 3M sodium hydroxide (NaOH) needed to convert 1.5g of benzoic acid to its salt. I got 0.012 moles of bezoic acid present...

### English

1. For here or to go? - For here. 2. Here or to go? - Here 3. Is this for here or to go? - For here. 4. Is this here or to go? - Here. (Which ones are grammatical?)

### mat 117/ algebra

My question is about scientific notations. Here is the problem. What I need clarification on is the power signs. When to add, subtract or multiply? (2.4 x 10^-5)(4 x 10^-4) is the anwer 9.6 x 10^-9 or 9.6 x 10^20 The answer is NOT 9.6 x 10^20. Rember your rules of exponents: ...

This is in regard to my earlier post about the conversation- Thank you for all your help.Thank you for your patience too Could you recheck this? I don't understand about who talks much-my number 10 but I think you put it at #9You said it was the brother not the person but I'm ...

### chemistry

I am a freshman in college, and am taking a placement test soon, but haven't seen chemistry since 10th grade. I'd appreciate any help I can get from anyone here to help me solve this problem: Hydrogen and sulfur chemically combine to form the gas hydrogen sulfide, according to...

### chemistry

I'm kind of having difficulty with a question involving dimensional analysis. I'm confused how I would convert some units into others and what to divide. Here's the question. One 5lb Hershey's kiss is equivalent to how many little Hershey's Kisses? (1 Hershey Kiss is equal to ...

### Chemistry

Sorry still confused. Here's the problem: 0.249g of a diatomic element occupies a volume of 125mL at 120 degrees Celsius and 2.00 atm. This element IS? I used PV/RT =n so: 2.00 atm (.125L)/0.0821L*atm/mol*K (393K) = 11.96 then 0.249/11.96 =20.1 which is Neon. It isn't diatomic...

### chemistry

so here i am doing my hw worksheet on the ideal gas law/ghram's law ad i have gotten to this one problem where i am totally stuck and confused. Please help me by telling me how to set this up and giving me tips, if necessary. What is the mass(in grams) of ammonia gas(NH{tiny #...

### PreCalculus

i am confused about what approach to take for (limit as x goes to 0) of (ln(1+x))/x if i had x going to infinity, i could do l'hospitals, but here?

### chemistry A level

hello my teacher has really confused me. can anyone tell me how you can figure out the shapes of molecules and what types of shapes there are??? i am really confused! thankyou xxxx

### chemistry

so here i am doing my hw worksheet on the ideal gas law/ghram's law ad i have gotten to this one problem where i am totally stuck and confused. Please help me by telling me how to set this up and giving me tips, if necessary. What is the mass(in grams) of ammonia gas(NH{tiny #...

### chemistry

So here I am doing my HW worksheet on the ideal gas law/graham's law ad I have gotten to this one problem where I am totally stuck and confused. Please help me by telling me how to set this up and giving me tips, if necessary. What is the mass (in grams) of ammonia gas (NH {...

What phrase structure rule creates coordinate structures? I am confused here. Is it prepositional phrases?

### integration by parts

s- integral s ln (2x+1)dx ? = ln(2x+1)x - s x d( ln (2x+1)) = ln(2x+1)x- s x [(2x+1)'/ (2x+1)] dx = ln(2x+1)x- s x [(2)/ (2x+1)] ?... then i'm confused... "ln(2x+1)x- s x [(2)/ (2x+1)] ?... then i'm confused..." x [(2)/ (2x+1)] = 2x/(2x+1) = (2x+1-1)/(2x+1) = 1-1/(2x+1) B.t.w...

### English

1. She was confused at his error. 1-2. She was confused by his error. 2. He was confused about something. 3. He is confused in mind. (Are they all grammatical? Which prepositions are commonly used?) 4. That is very confusing to the public. 5. That is very confusing for the ...

### Chemistry.HELP (IONS)

Determne the boiling point of 16.3g of calcium chloride dissolved in 250. g water. My work: 16.3 g CaCl2 *(1 mole CaCl2/110.984 g Cacl2)= 0.147 mol CaCl2 M= 0.147/0.250kg =0.588 mCaCl2 ... From here, How do you find out how many ions CaCl2 has. Calcium has a 2+ charge and Cl ...

### Algebra

(3x^2+2)/(x^2-4)-(9x-x^2)/(x^2-4) Your problem: (3x^2+2)/(x^2-4)-(9x-x^2)/(x^2-4) Since the denominator is the same, just subtract the numerator: (3x^2 + 2 - 9x + x^2)/(x^2 - 4) -->remember to use the distributive property with the negative over the terms in the numerator ...

### Chemistry

Please help me with this question: Calculate the theoretical yield amount of CaCl2 that would be required to change the temp of 50ml of water from room temp 20degree to 45 degrees. Heat Capacity H20 is 4.184 Jg^-1deg^-1 and density is 1g/mL. I've already calculated: Q=mc delta...

### Grammar and Composition

Hi, Can someone please read my huge post below and complete the last part for me (it is to be done by an adult), thank you sooo much!

### Math (pre-algerbra)

I've tried this sooo many times I have huge marks on my paper and I just can't figure it out: 3a/8-a/12+7/2=7

### Chemistry*Dr.Bob

I keep finding all sorts of different enthalpy of vaporizations for bromine. I used: 254.66 So factoring 254.66/2 into my equation below i ended up with a lattice energy of -863.33. Can you confirm this? ____________________________________________________________ What is the ...

### chem

Oh Dr.BOB...I am so lost..and sooo frustrated. Can you explain to me how to balance a chemical equation one more time please. Thanks Stacey

### algebra

Verify that the functions f and g are inverses of each other by showing f(g(x)) = x and g(f(x)) = x f(x) = x^3 + 5 g(x) = 3sqrtx-5 ( 3 is inside check mark on the sqrt. I am sooo totally lost on these!

### Chemistry

Please help me with this question: Calculate the theoretical yield amount of CaCl2 that would be required to change the temp of 50ml of water from room temp 20degree to 45 degrees. Heat Capacity H20 is 4.184 Jg^-1deg^-1 and density is 1g/mL. I've already calculated: Q=mc delta...

### honors algebra II

factoring:: i factored 15A^2B - 10AB^2 into... (15A - 10B)(15A + 10B) am i doing it correctly? because im pretty confused. thanks :] No, you are confused. This is not a difference of squares. Neither the first term or the last is a perfect square. Here, there are common ...

### Math

5x - 4y =-3 Y = -3x + 5 Solve for x and y How do we solve for x and y when the formats of the equations are different. That's we here I'm lost. When I try to get the answer I get confused

### biology

okay im totally lost here, the question i need to answer is explain why codons can't consist of two bases instead of three for each amino acid. im so confused..help!

### engineering

Hey everyone! I have an exam on Monday and I want to know what I should do for this. Explain the sources and implications of size effect in strength of materials. Thank you sooo much ! :)

### math

solve for x and y when 5x-3y-2=0 and 7x+y=0. Please this is sooo hard. no clue how to do it. please show me how to do it.

### math

thank you so much reny! but i was wonndering how can you factor x8-2x6+x5+x4-x3+x+1 by x3+1 THANK YOU SOOO MUCH!

### Physics

A 30 ohm resistor is connected to a 1.5 V battery. How much power is dissipated by the resistor? I'm confused of the formula to use here.

### Geometry

Solve for x. x(x+3)=2^2 I think I'm doing this all wrong. Here is the work I've done so far: x^2+3x=4 x^2+3x-4=0 ...now what? i started trying to use the equation x=-b sqrt of (b^2-4ac) but I'm just getting confused...

### Geometry

Solve for x. x(x+3)=2^2 I think I'm doing this all wrong. Here is the work I've done so far: x^2+3x=4 x^2+3x-4=0 ...now what? i started trying to use the equation x=-b sqrt of (b^2-4ac) but I'm just getting confused...

### Science....

Look at my previous post.... Can anyone please answer my science question??? well what's the question? http://www.sinauer.com/cooper/4e/chapter10.html Well, did u look at my previous post??? Hey Lance!! Thanx sooo much!! I got the problem right! I owe u one! Hey Lance!! Thanx ...

### Physics (SO CONFUSED!!!)

I think I'm using the wrong formulas or SOMETHING... Here's the question: "Two equal charges are separated by 3.7 ´ 10^-10 m. The force between the charges has a magnitude of 2.37 ´ 10^-3 N. What is the magnitude of q on the charges?" Here's my work: F = kc(q1q2/r^2) 2.37 x ...

### Chemistry 111

A gas occupies a volume of 256mL at a pressure of 250torr at 32 degrees Celsius. Calculate the pressure (in atmosphere)if the volume is reduced to 156mL and the temp is increased to 62 degrees Celsius. I really need the formula that I would be using. I am confused because ...

### Math College

A 6-sided die is rolled 14 times. What is the probability of seeing a "6" at least 2 times? I am sooo clueless please help!

### chemistry

For Hg2+(aq) + 2e -> Hg(l) E=0.851 V This means that: A) Hg(l) is more readily oxidized than H_2(g); B) Hg^2+(aq) is more readily reduced than H^+(aq) C) Hg(l) will dissolve in 1 M HCl D) Hg(l) will displace Zn(s) from an aqueous solution of Zn^2+ ion ~~~~~~ Sooo...this ...

### history-Civil War

Sorry Sra...your sites didn't help..i was in sooo many sites last two days...no discussion found on this question..you don't know the answer to this ?

I'm Pretty Confused About This.... Has Something To Do With Bar Graphs?! Here's The Question: Is A Data File Needed To Make A Bar Graph?

### government

I am really confused with this part of my homework. Mrs. Sue please help me. OK here is my question: Why do you think free enterprise and capitalism usually develop as economic systems under democracy?

### Chemistry

Write the overall cell reaction for a cell containing aluminum metal and Zinc(II)sulfate so would it be: Al (s) + ZnSO4 (aq) <---> Al3+ + ZnSO4 ?????? I tried to do it myself but I'm a bit confused... I'm confused about the charges because isn't ZnSO4 neutral since Zn is...

### Math

Can someone please help me figure out the mean, standard deviation, raw score, and z-score of 27,3,4,16,0.. Any help is super appriciated.. thanks sooo much.

### Algebra (Re.: Reiny)

The fact that there was that nice symmetry to the question, makes it easier than it first appears. I had it as: (a/b + b/a)÷(b/a - a/b) look at (a/b + b/a) the common denominator for this would be ab, so a/b + b/a = (a^2 + b^2)/ab similarly for (b/a - a/b) the common ...

### English Expressions

Here you are. Here it is. Here they are. Here you go. There you go. ------------------------- Are all the expressions can be used when we hand something to another? Are they the same in meaning?

### Chemistry

A student mixed 15.0 mL of a solution of 0.0200 M ferric chloride FeCl3, with 25.0 mL of water. Calculate the moles of iron ion, Fe +3 in the resulting solution. (I think this is a Dilution problem, but I wasn't really sure how to start it out. Any help would be greatly ...

### Math

I am trying to figure how to solve this but I am totally confused? Can someone help explain this to me? y + x = -6 I know the formula to use is y=mx+b but just not to sure how to work the problem out so I can graph this? Have any suggestions for me? Would love to here them. ...