Posts by ANON

Total # Posts: 2,826

Chemistry
apparently the answer is C, yet i cannot find any explanation to it...

algebra
in the past professional baseball was played at the astrodome in Houston, Texas. the astrodome has a maximum height of 63.4 m. the height of a baseball t seconds after it is hit straight up in the air with a velocity of 45 ft/s is given by h = -9.8t + 45t + 1. will a baseball ...

History
What are some of the toughest hardships that emigrants faced along the oregon trail?

History
Why did people move west in the 1800s?

algebra
solve for x: x-18 =64

Years ?
"In the early 1930s" what years are those like 1900-1930 right?

Reading/Maps
This is what I have to do "Draw a map of mainland U.S.A. and show (draw)how the mississippi river divides the country (part of the labeling) and label both sides correctly." I was wondering if you can find me a map that way I can start it off like how exactly do I do...

Science
what should you consider when you plan a title for a graph?

um math
what does a circle graph show that a bar graph does not?

science asap
Air pressure decreases as altitude increases ^ which one goes on the horizontal axis and which one goes vertical axis? how did you choose this scale? (This is for a line graph)

writing
how can i reword this differently Free will is God’s indispensable gift to humanity, and we must allow ourselves to be open to salvation in light of the choices we make.

math
-5 and 5/2 are both correct answers

math
Katie, how is that relevant to the question? We're here to answer questions, not ask them.

geography
Ok thanks for the help :) the answer for the 2 was A, but I do see what you were saying about C. Since everyone is the same age that would allow more cultural similarities, but I guess us being in a jungle would be more about being stranded than actually living in a jungle. I ...

geography
Should it be B and A? I was kind of unsure of 1 because A seemed too obvious.

geography
Check my answers, please? I put an asterisk next to which ever ones are my answer. Thanks! Why do you think the Inuit have retained aspects of their early culture? *A.because they are used to that lifestyle B.because such adaptations allow them to survive in their environment ...

Algebra 8th grade
3a + 5b = 70 6a + 9b = 135

Chemistry
Nvm it was -1.02*10^3 KJ

Chemistry
Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) <-- --> 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e- -> Ni(s) E=-0.26 Au3+(aq) + 3e- -> Au(s) E=+1.498 G= ? KJ Would it be G=1.758? •Chemistry - DrBob222, Sunday, March...

Chemistry
A galvanic (voltaic) cell consists of an electrode composed of magnesium in a 1.0 M magnesium ion solution and another electrode composed of copper in a 1.0 M copper(I) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 dC.

Chemistry
It is still wrong.

Chemistry
I got -1.02*10^6 but it is wrong.

Chemistry
Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) <-- --> 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e¨C ¡ú Ni(s) E=¨C0.26 Au3+(aq) + 3e¨C ¡ú Au(s) E=+1.498 G= ? KJ Would it be G=1.758?

Chemistry
So would it be X^2+ and Y^2+?

Chemistry
X^2+ + 2e- -> X(s) E=1.73V Y^2+ + 2e- -> Y(s) E=0.40v Which pair of species would react under standard conditions? X^2+ and Y^2+ X and Y^2+ X and Y X^2+ and Y Would it be X and Y because the E is positive?

7th Grade Social Studies
1)b 2)d 3)b 4)a 5)c 6)c 7)b 8)a 9)d 10)c

Chemistry
Calculate the cell potential for the following reaction as written at 59 ¡ãC, given that [Cr2+] = 0.763 M and [Sn2+] = 0.0170 M. Standard reduction potentials: Sn2+(aq) + 2e¨C ¡ú Sn(s) E=¨C0.14 Cr2+(aq) + 2e¨C ¡ú Cr(s) E=¨...

Chemistry
Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2? Br2 Ca Co2+ Co Br- Ca2+

Chemistry
A current of 5.61 A is pass through a Ni(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 9.00 g of nickel?

Chemistry
A current of 4.60 A is passed through a Pb(NO3)2 solution for 1.20 hours. How much lead is plated out of the solution?

chemistry
a) deprotonation of the alcohol

algebra 10th grade
Checking algebra answers, Is it correct 320km/1hr ↓ 320km /1hr →1m/1.609km =320m/1.609hr÷=199.3mph Answer: Round to nearest 10th =198.9mph

Chemistry
^^ these are all correct, just took the quiz!

Physics
A 85-kg snow skier is being pulled up a 17 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.4 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.6 x 10-4 m. A frictional ...

Pre calculus
How do I solve this exponent problem? I understand the exponent rules, but I getting 1 but 1 is not the answer! I don't want anyone to solve the problem for me, I want to learn how to solve this type of problem. Thank you! Solve the equation: -8=-3-6 (3sqrtx^2) Thanks again!

maths
This is a question from Brilliant dot org.

Science
Are compounds chemical or physical changes of matter?

Science 8th grade
what gets hot and cold faster, solid or gas and why?

Math
Right so, we already know that the area of the rectangle would be 170x90=15300 And the area of one circle of diameter 8 would be; 16xpi We can't estimate the amount of space wasted in between circles but we can tell through the diameter the amount of circles that will fit ...

Quantum Physics
Please help for Q9!

Biology
To take the energy from an exergonic reaction and use it to power an endergonic reaction, a cell can: create the energy for the endergonic reaction to occur. Why is this false? I thought a exergonic reaction create energy for the endergonic reaction to occur?

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by selective ...

Chemsitry
The Ksp of PbBr2 is 6.60× 10^–6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0.500 M KBr solution? What is the molar solubility of PbBr2 in a 0.500 M Pb(NO3)2 solution?

Chemistry
At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 °C? Is the ksp=1.38*10^-11?

Chemistry
My calculator only show up to the 1.0*10^-9 not 1.46*10^-9. Thanks

Chemistry
The answer is wrong. ksp is not 1.00*10^-9

Chemistry
Is the answer 1.50*10^-14?

Chemistry
What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 Is the concentration of SO32- = 4.69*10^-12?

Chemistry
At 25 °C only 0.0610 mol of the generic salt AB2 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C? AB2(s) <- -> A^2+(aq)+2B^-(aq) Is the answer ksp=9.08*10^-4?

Chemistry
At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 °C?

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by selective precipitation?

Chemistry
The Ksp of magnesium hydroxide, Mg(OH)2, is 5.61 × 10^-12. Calculate the molar solubility of this compound. Is the answer 1.1*10^-4 M?

History
1.d 2.c 3.b 4.d 5.d

English
It is wrong. COMPOSED

English
By the time he was twelve years old, Mozart had compose an entire opera. Is this correct?

Chemistry
Which of the following will be more soluble in an acidic solution than in pure water? Be(OH)2 Ag2SO4 RbClO4 CuCN Cul

Chemistry
A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

Chemistry
What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 The ksp expression is 1.50×10^-14=(Ag^+2)^2(SO3^-2)/(Ag2SO3). Is the concentration 3.0×10^-9?

Help Ms.Sue Please
D B C A B A B C A

Chemistry
H3BO3 -> H+ + H2BO3- Why doesn't H3BO3 break down to something with H3O+ because it is a weak acid? I know many weak acids break down to something with H3O+ like HCN, C6H5COOH, HNO2, and HF.

math
Tara filled 1/6 of her garden with tomato plants. Dan filled 1/6 of his garden with cucumber plants. How much did they fill in total?

SCIENCE
Above can hardly talk about cheating, in order for you to have found this page you had to search the question, thus you were trying to cheat also. Before you start pointing fingers, make sure your hands are clean.

Social Studies
1)B 2)B 3)D

English
A worker can hear neighbors tapping on computer keyboards, making telephone calls, and muttering under their breath. Is this right or wrong?

Algebra
Thank you to the both of you. I understand now I was getting mixed up. :)

Algebra
Can you please solve this I don't understand I know the answer is b>3 but If you can break it down for me and show work? (: 3b+12>27-2b

maths-perimter
The sides of a hypotenuse are all multiples of the original Pythagorean triple: 3, 4, 5. Obviously in this, 5 is the hypotenuse and in your equation so is 20. To get 20, you have to multiply 5 by four so to get the Pythagorean triple you just need to multiply the original set ...

Science
How does the temperature change in the sun's atmosphere differ from the temperature change in the sun's interior?

Math 7th grade
Katya bought 2 gallons of juice. she drank 2 quarts. how much was left?

social studies
I agree with Chelsea. This is no place to cheat. If you didn't see what the name of site is. its homework 'HELP' and the word help does not mean teachers on here just giving you the answer. Jeez do your own test.

Algebra/Math
Can you show work por favor? :) A metalworker has a metal alloy that is 20% copper and another alloy that is 60% copper. How many kilograms of each alloy should be combined to create 80 kg of a 53% copper alloy?

Spanish
What's the date of your birthday? B. It's the first of Dec. How old is your mom? A. She's 36.

Chemistry
calculate the energy in joules lost when 70.0 grams of water cools from 86.4 celsius to 7.1 celsius

Chemistry
you have 20% sucrose solution. you need to mke 100ml of 15% sucrose solution. which is the correct dilution? A. 85ml of 20% sucrose and 15ml of h2o B. 25ml of 20% sucrose and 75ml of h2o C. 75ml of 20% sucrose and 25ml of h2o D. 15ml of 20% sucrose and 85ml of h2o

Chemistry
It said it is still wrong. It said Which of the two strong bases will produce more OH ions per formula unit?

NEED HELP ASAP
So it would be KOH>Ca(OH)2>NH3>HBrO>HBr?

NEED HELP ASAP
The answer you put is wrong.

Chemistry
Rank these to highest pH to lowest pH: NH3, KOH, Ca(OH)2, HBr, HBrO I put these in the same order for highest pH to lowest but still get it wrong.

chemisty
The density is the mass/volume. You will have to calculate the volume of the block. The volume of a block is the height x width x length. However, before multiplying, be sure to convert the dimensions so they are the same units. For example, convert them to cm.

CALCULUS
The derivative of e^x is e^x. To determine the derivative apply the constant multiple rule

Earth Science
Which geologic principle states that if rock strata are found folded or faulted, the folding or faulting occurred after they were deposited? faunal succession uniformitarianism original horizontality cross-cutting relationships Uniformitarianism does not sound right at all for...

Algebra
-2x-y=-1 how do you put this in slope-intercept form y=mx=b ?

MATH
????????

MATH
What are the answers?

Math
A bag contains 10 yellow, 15 blue and 5 red Marbles. Mark chooses a candy and doesn't replace it in the bag. Find P (neither blue)

Math
A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?

Physics
A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?

math
In the U.S., 4634 million pounds of apples were consumed in 2002. The population of the U.S. in that year was 290 million. 1. a medium apple weighs about 5 ounces. estimate how many apples a family of four would have consumed in one month.

science
convection and radiation

Chemistry
Kc=0.0406

NEED HELP!
So part a would be at equilibrium and part b would be goes to the left?

Chemistry
In which direction will the net reaction proceed X(g)+Y(g)<---->Z(g) Kp=1.00 at 300k for each of these sets of initial conditions? a) [X]=[Y]=[Z]=1.0 m net reaction goes to the left net reaction goes to the right reaction is at equilibrium I chose 3 for a. b) Px=Pz=1.0 ...

Chemistry
Some people should not be allowed to help others with chemistry...solids do not have concentrations...therefore doubling the volume would have no effect

Chemistry
Kc = 1.2^2/3.8=0.379 The container volume is doubled A(s)<------>B(g)+C(g) (3.8/2)-----x----x--- 0.379 = (x^2)/(1.9 - x) x^2 + 0.379x - 0.7201 = 0 x=0.679 M A = 1.9 - 0.679 = 1.22 M But I got it wrong.

NEED HELP!
•NEED HELP ASAP - Anon, Tuesday, February 5, 2013 at 11:14pm How do I find x and the moles? •NEED HELP! - Anon, Tuesday, February 5, 2013 at 11:25pm Is x=0.189? I used the quadratic equation to solve for x from Kc = 0.514 = (0.6+x)(0.6+x)/(1.4-x). How do you find the...

Chemistry
4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...

Chemistry
2.422 mols is wrong.

NEED HELP ASAP!
Kc = 1.2^2/3.8=0.379 The container volume is doubled A(s)<------>B(g)+C(g) (3.8/2)-----x----x--- 0.379 = (x^2)/(1.9 - x) x^2 + 0.379x - 0.7201 = 0 x=0.679 M A = 1.9 - 0.679 = 1.22 M But I got it wrong.

NEED HELP
I got it wrong. X doesn't equal .189. I really need help on solving this problem.

NEED HELP!
Is x=0.189? I used the quadratic equation to solve for x from Kc = 0.514 = (0.6+x)(0.6+x)/(1.4-x). How do you find the moles of A?

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