Thursday

July 31, 2014

July 31, 2014

Total # Posts: 501

**science**

Air pressure at the surface of a fresh water lake near sea level is about 10^5 N/m2. At approximately what depth below the surface does a diver experience a pressure of 3.0 e5 N/m2?

**Math**

Kaylee got a 15% raise. She now earns $23 an hour. How much did she earn before the raise?

**Math**

What is the maximum value of the function y= 18/x^2-9 over the interval -3<x<3? A. 0 B. 2 C. -2 D. Infinity

**Science**

Which statement summarizes water quality issues in China

**Chemisty**

a)What is the [Ca2+] when 100mL of .05M CaCl2 is added to 100mL of .10M K2SO4? b) What is the [SO42-] for part a? c) write the Ksp expression for CaSO4 d)Will a precipitate form in the solution from part a)?

**Math**

What is 3/8=4m-2 over _____ 12

**history**

Thanks for the help :)

**history**

So, it will be A then.

**history**

During the 1950s, the advent of _______ created the largest and fastest-growing impact on American society. A. television. B. suburban communities C. educational reform D. fundamentalist religion. I think it's D. Am I correct?

**science**

Wrong... MA of inclined plane = 20m/1.2m = 16.67 &the rest idk.

**Math**

Tiffany bought 2/5 kg of cherries. Linda bought 1/10 kg of cherries less than Tiffany. How many kg of cherries did they buy altogether?

**Math**

Express fraction 9/4 as the sum of two or three equal parts. Rewrite the problem as a multiplication equation.

**algebra 1 **

parallel and perpendicular lines write the slope-intercept for an equation of the line that passes through the given point and is perpendicular to the graph of each equation (4-2) y=1/2 +1, ( 2,-3) y= -2/3+4 (-8,-7) y=-x-8 (6,-2) y=-3x-6

**Chemistry**

A reaction: A(aq) + B(aq) <-> C(aq) has a standard free-energy change of –4.65 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? Im not...

**Chemistry**

Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12× 10–12. What is the solubility (in mol/L) of silver chromate in 1.4 M potassium chromate aqueous solution? In 1.4 M silver nitrate aqueous solution? In pure water?

**Chemistry**

The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (in g/L) of CaSO4(s) in 0.300 M Na2SO4(aq) at 25 °C

**human resource**

please help me with my assignment? The company has seven department stores in your city. One of your biggest problems is adequately training new salesclerks. 1. Design a three-day orientation/training program for new salesclerks. to be used. 2. Specify what methods could be us...

**human resource**

The company has seven department stores in your city. One of your biggest problems is adequately training new salesclerks. 1. Design a three-day orientation/training program for new salesclerks. to be used. 2. Specify what methods could be used to evaluate the success of the p...

**Need Help with Math? **

1. Translate P(4,0) right 3 units and up 5 units. Give the coordinates of the image point. (-5,1) (1,-5) (5,7) (7,5) 2. Point A(6, -2) is reflected over the x-axis. Write the coordinates of A'. 6,2 6,-2 -6,2 -6,-2

**Chemistry**

I was able to figure it out! Thank you very much for your help(:

**Chemistry**

I don't know what to do after I set up the Kc equation. How do you isolate x from 1.80=(x^2)/(.062-x)

**Chemistry**

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.206 mol sample of PCl5(g) is injected into an empty 3.30 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PC...

**Math**

Shelly compared the number of oak trees to the number of maple trees as part of a study about hardwood trees in a woodlot. She counted 9 maple trees to every 5 oak trees. Later in the year there was a bug problem and many trees died. New trees were planted to make sure there w...

**Math Help? Check my answers.**

So it would be 3 and not 5?

**Math Help? Check my answers.**

Simplify 6 x 3 divide 3 - 1. Pre-Algebra? Answers: 2 3 5 6 My answer: 5

**Math**

I'm currently taking IBMS and it has elements of several types of math classes (calculus, statistics, algebra, etc.). It is the "lowest" level IB Math class one can take, but not necessarily for students who have a low background in math. I know one student who d...

**psychology**

Nelda is fearful of public places and has managed to stay "at home" for the last three years. She and her therapist have developed a strategy. During the first week, she will go to the front door and open it and look outside. If she can remain calm, the goal for the ...

**psychology**

Its between B and D ... so im going with D

**psychology**

26. Emily and her mother have entered a new place. There are toys on the floor to play with, but no one else is in the room. After a few months on her mothers lap, Emily begins to move toward the toys and is soon playing happily while her mother reads a magazine. When a s...

**psychology**

25. Teenage mothers who are accustomed to existing on hamburgers, French fries, and Cokes need to consider the nutritional needs of the child. Research has shown that a poor diet can _______________.
A. restrict the development of eye and hair color
...

**Psychology**

19. If Paul and Rita are exposed to erotic photographs of the opposite sex, it can be expected that _______________.
A. Rita will report significantly less arousal than Paul
B. Paul will report significantly less arousal than Rita
C.&nbs...

**psychology**

15. Maria is a Hispanic female, Natasha is a Black female, and Joan is a White female. Each has a high school level education but no work . Statistics show that ..
A. Natasha will earn less than Maria
B. Joan will earn less than Natasha
...

**Psychology**

Well i think this question eliminates B and D... so it could be A then.

**Psychology**

16. Greg and Lydia have been married three years. Both hold executive positions in large corporations and are well respected in their fields. Last January, they were thrilled with the arrival of their first child. Lydia returned to her same position after the birth of the...

**Psychology**

i believe its primary drives..

**Psychology**

Families traveling with young children often make many stops as a result of
A. Primary drives
B. Secondary drives
C. Incentives
D. Cognitive needs

**psychology**

The entire class was in an uproar. The teaching assistant had proctored the exam while the professor was attending a conference and the test seemed unrelated to the chapters which they had studied. The students complaints are based on the test's lack of ______________.&nbs...

**Physics**

A man driving a car toward a large vertical wal sounds his horn. The car is traveling at 81 km/h. The echo off the wall is heard by the man at a frequency of 958 Hz. What is the frequency of the car's horn?

**arithmetic**

james used the rule add 2 to create a sequence.the he used the rule add 12 to create a second sequence.what are the first five terms in each sequence james created?<3

**chemistry (need by 5!!)**

use the van der waals equation to calculate the pressure of 4.00 mol of H20 at 471K in a 4.60-L vessel. how do you solve?

**Chemistry **

By titration it is found that 76.3Ml of 0.178M of NaOH(aq) is needed to neutralize 25.00mL of HCL(aq). Calculate the concentration of the HCl solution.

**Chemistry **

Suppose we have a solution of lead nitrate, Pb(NO3). A solution of NaCl(aq) is added slowly until no further precipitation occurs. The precipitate is collected by filtration, dried and weighed. A total of 10.27g of PbCl2(s) is obtained from 200.0mL of the original solution. Ca...

**Chemistry**

What mass of precipitate will form if 1.50L of concentrated Pb(ClO3)2 is mixed with 0.200L of 0.280M of NaI? Assume the reaction is complete

**Chemistry**

What is the significance of the distance between two metals in the activity series?

**World History**

He was the Chief Justice of the United States Supreme Court from 1836 to 1864. He's remembered as the author of the majority opinion in Dred Scott vs. Sandford in 1857, sometimes known as the Dred Scott Decision

**social studies**

How are petitions and Demonstrations similar?

**social studies**

African amirican used both petitions and demonstrations to fight for cilvil rights?

**social studies**

how are they different?

**social studies**

African Amrican used both petitions and demonstrations to fight for the cilvl rights?

**us history**

the American contitution is base on which belief?

**science**

How many seconds does it take for mercury to go from 0 degrees celsius to 300 degrees celsius?

**Algebra**

How do I work this problem? "Susan is 9 years older than Karen. In 10 years Karen will be 2/3 Susan's age. How old will the two girls be in 10 years?"

**Math**

11/12-1/9=

**physics**

Water (η = 1.00E-3 Pa·s) is flowing through a horizontal pipe with a volume flow rate of 0.0153 m3/s. As the drawing below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0477 m and L = 0.670 m I know how to plug in everything but,...

**Physics,Question ,Solved but about Units?**

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered...

**Physics**

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered...

**Physics**

Show that the average speed of a rabbit that runs a distance of 30 m in a time of 2 s is 15 m/s. I have a whole bunch of problems such as these and i'm not sure what math formula to use to figure problem.I know its Acceleration ! change of velocity time interval ! "v ...

**geometry **

I need help on this question... "Make a conjecture about the next item in the sequence. 1,-2,-5,-8,-11,? Please help...

**geometry**

I need help on this..please write the converse,inverse,and contrapositive of the statement.determine if its true or false,if its false write counterexample. "If 2 angles are adjacent,then the angles have common vertex.

**chemistry**

Indicate the number of equivalents in each of the following: 4mol Mg2+ 0.1mol H+ 2mol Cl- 3mol Fe3+

**physics**

A diver springs upward from a board that is 2.98 meters above the water. At the instant she contacts the water her speed is 9.39 m/s and her body makes an angle of 70.4° with respect to the horizontal surface of the water. Determine her initial velocity.

**college basic algebra**

49 less than a number

**geometry**

Supplementary is when angles add up to 180 degrees

**geometry**

I need help on this question...please help. "The measures of two supplementary angles are 3x-12 and 4x-18.Find the measures of the angles.

**Math**

thank you you are a great help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

**Medical**

Is it true medical assisting are licensed by each state?

**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 s...

**chemistry**

Calculate the cell potential for the following reaction as written at 51 degrees C, given that [Zn2+] = 0.837 M and [Sn2+] = 0.0180 M. Zn(s) + Sn^2+(aq) = Zn^2+(aq)+Sn(s) E = __ V Reduction Half-Reaction Standard Potential Ered° (V) Zn2+(aq) + 2e– → Zn(s) –...

**Chemistry**

got it! thanks!

**Chemistry**

Calculate delta G of the reaction at 25 degrees C: 2Au^3+ (aq) + 3Ni(s) <=> 2Au(s) + 3Ni^2+(aq) Au3+ + 3e- ==> Au Eo = +1.50V Ni2+ + 2e- ==> Ni Eo = -0.23 V 2Au3+ + 3Ni ==> 3Ni2+ + 2Au The answer is -1.00 x 10^3 kJ but i'm not getting that answer!!!!!!! plea...

**Chemistry**

Consider two cells, the first with Al and Ag electrodes, and the second with Zn and Ni electrodes, each in appropriate 1.00M solutions of their ions. If 2.10g of metal is plated in the voltaic cell, how much metal is plated in the electrolytic cell? Another plated question... ...

**Chemistry**

Whoops your right I totally calculated "51.9961/(96485 x 2) x 5.18 A x 4320 g Cr = 24.118 g?" incorrectly. Thank you!

**Chemistry**

A current of 5.18 A is pass through a Cr(NO3)2 solution for 1.20 hours. How much chromium is plated out of the solution? __g I have no idea how to approach this. Here's what I tried to do logically but I'm not sure if it works out: I know that the conversions are 1 A *...

**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. My textbook advised me to use the Nernst Equation and by rearranging an...

**science**

why are plastic handles on frying pans safer to than metal handles

**Chemistry**

I'm a bit iffy on oxidation numbers... can someone please tell me if this is correct? Assign oxidation states to each element on both sides of the equation : KClO2--->KCl+O2 Reactants K = +1 Cl = +1 O = -2 Products K = +1 Cl = -1 O = 0 the element being reduced is Cl an...

**Chemistry**

Oh i see that's where the reduction occurs now thanks dr bob!

**Chemistry**

There is a current being applied to an aqueous solution fo sodium bromide. What is produced at the cathode and anode? I said that Na(s) being produced at the cathode and Br2(l) being produced at the anode. The other options are H2 and O2 for either but those wouldn't make ...

**english**

SYNONYMS AND ANTONYMS

**english**

SYNONYMS AND ANTONYMS

**english**

SYNONYMS AND ANTONYMS

**english**

SYNONYMS AND ANTONYMS

**Chemistry**

I keep getting the last part of this question wrong. Strong base is dissolved in 765 mL of 0.200 M weak acid (Ka = 4.63 x 10^-5) to make a buffer with a pH of 4.18. Assume that the volume remains constant when the base is added. HA(aq) + OH-(aq) -. H2O(l) + A-(aq). I found tha...

**Chemistry**

Ohh yeah it was actually my fault DrBob i wrote 293 mL but it was actually 2.93 mL but i still got it after your explanation. THANK YOU!!!!

**Chemistry**

Hi DrBob 0.103 g Na2C2O4 divided by 134 g/mol Na2C2O4 = 0.000768 mol Na2C2O4 = 0.000768 mol KMnO4 0.000768 mol C2O4^-2 X 2 mol MnO4-/5 mol C2O4^-2 = 0.0003072 mols KMnO4 M KMnO4 = 0.0003072 mol/0.293 L = 0.001048 M..? is that right? close? or totally wrong?

**Chemistry**

Calculate the final concentration for the standardization of KMnO4 given this information: 2MnO4- + 5C2O4^-2 + 16H+ -> 2Mn^2+ + 10CO2 + 8H2O [final redox equation] Volume of KMnO4 titrated with H2SO4 + Na2C2O4 = 293 mL Volume KMnO4 titrated with H2SO4 alone = 0.2 mL Amount ...

**calculus**

If f(x)=x^2 –4, ... x > or equal to 0 and g(x)=sqrt(x+4) ... x > or equal to –4 , (a) f(g(x))= (b) g(f(x))= (c) Thus g(x) is called an INVERSE function of f(x) ----- If f is one-to-one and f(–4)=14, then f^–1 (14)= and (f(–4))^–1= . If g is ...

**Math**

i got it!!! i didn't multiply the answer by 2 pi -_- sorry!

**Math**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis? y=x^2 x=y^2 about the axis x=–2 here's what i did and it was incorrect V = 2pi [x+2][x^1/2 - x^2]dx from 0 to 1 V = 2 pi [2x^5/3 / 5 + 4x^3/2 / 3 - x^4/4 - 2x^3 ...

**Accounting**

When finding the break even point, I know that total fixed costs/contribution margin= Break Even Point, but is that answer in dollars? How do you find the sales volume (dollars) that need to be produced in order to break even? How do you find the required amount of hours that ...

**Chemistry**

Yeah me neither! Thanks though DrBob

**Chemistry**

A solution in which no more solid can be dissoved is referred to as [saturated?] In such a solution, the concentration of solute is called the ____ when reported in g/L and the [molarity?] when reported in mol/L. Does anybody know what might go in that blank by any chance?

**Chemistry**

Thank you! we havn't covered this in lecture yet so I wasn't sure what the formula was called

**Chemistry**

If a buffer solution is 0.190 M in a weak acid (Ka = 5.8 x 10^-5) and 0.550 M in its conjugate base, what is the pH? What if it said "if a buffer solution is ___ M in a weak base (Kb = ____) and ___ M in its conjugate acid, what is the pH? Would the steps from the first p...

**physics**

What is the longest wavelength that can be heard by a normal ear?

**Chemistry**

Ohh.. I didn't know you were supposed to multiply the SO32- concentration by 2 for Na... That's right thanks DrBob!

**Chemistry**

Calculate the concentrations of all species in a 0.810 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4 x 10^-2 and Ka2 = 6.3 x 10^-8 I calculated SO32- = 0.8096 M, HSO3- = 3.58E-4, H2SO3 = 7.1E-13, OH- = 3.58E-4, H+ = 2.79E-11 but ...

**Chemistry**

Thanks DrBob!

**Chemistry**

C6H5COOH(aq) + NO2-(aq) <=> C6H5COO-(aq) + HNO2(aq) A table of ionizations is given to calculate the equilibrium constant for this overall reaction.. but when i looked onto the table the only thing given was the Ka for C6H5COOH [6.3×10^–5] and HNO2 [5.6×...

**Chemistry**

thanks!!!!

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