# Posts by Mandy

Total # Posts: 577

**chemistry**

For a copper atom what is the value of Z ?

**chemistry**

i don't get it

**chemistry**

so then Zeff=z-s therfore 15.95-13.15 and that gives me the answer?

**chemistry**

How do i calculate the effective nuclear charge of a 3d electron of copper? what is the zeff. for a electron in the 3d orbital of copper. i looked up the answer to be 13.20, but i calculated 13.05 this is my work: (1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1) .35(17)+1(10)=15.95 29-15.95...

**chemistry**

How do i calculate the effective nuclear charge of a 3d electron of copper? what is the zeff. for a electron in the 3d orbital of copper. i looked up the answer to be 13.20, but i calculated 13.05 this is my work: (1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1) .35(17)+1(10)=15.95 29-15.95...

**chemistry**

Write a Lewis structure of OSF4 in which the formal charges of all atoms are zero

**Math**

What is the total area in square miles and square kilometers of Shubra al Khaymah, Egypt

**Economics**

I know that basic clothes are an inelastic item (need) but I cannot find the words to explain why. Any suggestions? ---Maybe as a source of protection from elements?

**science**

got to do a project on first aid. need some tips on the same and sites where can look for info

**Physics**

A boat takes 2.70 hours to travel 40.0 km down a river, then 5.90 hours to return. How fast is the river flowing?

**science**

Is it more efficient for people to eat plant products or animal products? Why?

**English**

Convolutes:Simple as bumpy:smooth or easy:difficult

**Economics**

How is the Internet a promoter of free enterprise? I came up with pop-ups but I can't think of another example.

**Economics**

How can the Internet be considered a product?

**Economics**

How can the Internet be considered a product and a promoter of free enterprise (besides pop-ups)?

**8th grade**

20%, because since there are 100 squares and 20, you can make that into a fraction. (How many blues/total) * 100...that is how you'll get the percent.

**Biology**

How can temperature influence antibody-antigen response? Would an increase quicken the response and a decrease in temp slow the response?

**Bio**

Would an increase quicken the response and a decrease in temp slow the response?

**Bio**

How can temperature influence antibody-antigen response?

**Chemistry**

Thank you so much! Im still a little confuse on the nanometers. on problem c im not sure how you ended up getting 2.945 x 10^-5 cm. Could you maybe explain a little more to me?

**Chemistry**

Can anyone help and check my answers? A. 8.43 cm to millimeters--- 84.3 millimeters. B. 2.41x10^2 cm to meterss--- 0.0241 meters. C. 294.5 nm to centimeters--- I don't know how to concert this. D. 1.445x10^4 m to kilometers--- 0.001443 Kilometers. E. 235.3 m to millimeters...

**Chemistry**

A student performed an anaysis of a samply for its calcium content and got the following results : 14.92% , 14.91%, 14.88% , 14.91% the actualy amount of calcium in te sample is 15.70%. What conclusion can you draw about the accuracy and precision of these results? --im really...

**Geography**

How might higher levels of development of a country be related to temperate locations??

**Algebra**

b)The water line is given by the equation y=-2/3x-12 Suppose you want to put a pink flamingo lawn ornament in your backyard, but you want to avoid placing it directly over the water line, in case you need to excavate the line for repairs in the future. Could you place it at ...

**I HAVE A MATH TEST TOMORROW HELPPP PLEASE!**

thank you so much. you don't know how much that helped!

**I HAVE A MATH TEST TOMORROW HELPPP PLEASE!**

im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!

**I HAVE A MATH TEST TOMORROW HELPPP PLEASE!**

im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!

**CHEMISTRY**

is that for every mole in problems like these? because i thought it was 6.022x10^23

**CHEMISTRY**

I need help please. "what voluma [in mL] at STp will be occupied by 0.0035 mol of methane [CH4]" THANK YOU SOO MUCH!

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**CHEMISTRY**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**Chemistry**

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g of CuS and ...

**research writing**

How do you determine whether to quote, paraphrase, or summarize a source?

**Algebra II**

What would be the inverse of: f(x)= 6/x Is it the same?

**History**

How did America participate in the Cold War?

**Social Studies**

Was Nixon the future U.S. president that played a major role in HUAC invesitagions and hearings?

**College Calculus**

Suppose the series An (from n=1 to INF) is known to be convergent. Prove that series 1/(An) (from n=1 to INF) is a divergent series. I have no idea what to do... please help!

**calculus**

Hello. I need help finding the open intervals of this equation: f(x)=3x^2-12 I already took the derivative of it by using the derivative test and I got 2,-2 as critical numbers

**calculus**

Hello. I need help finding the open intervals of this equation: f(x)=3x^2-12 I already took the derivative of it by using the derivative test and I got 2,-2 as critical numbers

**Algebra**

how do you solve linear combinations?

**Calculus I**

Find the point on the curve y=x^2 closest to point (0,1) Here's what I have: Sqrt {(x-0)^2 + ((x^2)-1)} Sqrt {((x^2) + (x^2)-1} d= sqrt (x^4)-1 y= (x^4)-1 Fprime(x) = 4x^3 Domain = ARN Critical Number x= 0 Any help or comments would help alot. Thanks!

**spanish PLEASE HELP**

I need help to figure out Direct object pronouns that are written in spanish to put them back into spanish how do I do this? Questions like Vas a llamarme manana?

**spanish PLEASE HELP**

I need help to figure out Direct object pronouns that are written in spanish to put them back into spanish how do I do this?

**Economics**

Suppose a firm faces a downward sloping demand curve givven by the equation 1=100-1/3P. The firm's cost function is given by the equation C=30+1/4Q^2. Find the profit maximizing level of output.

**Math**

The average radius r in meters of a planet's path around the sun is given by the formula r=[(3.35 x 10^18)t^2]^1/3, where t is the time in seconds that it takes the planet to go around the sun. a. Rewrite the equation using the root symbol. b. Neptune takes about 5.2 x 10^...

**Math**

Where can I find a online calculator online?

**Math**

I have a TI-83 Plus calculator and was wanting to plot some data from my homework, but when I want to insert the x and y on my calculator, I only have an X column and no Y column. How can I add that column in order for me to plot my data? I'm looking at my calculator but I...

**physics**

A 120 kg mass is blown apart into an 80 kg piece and 40 kg piece. after the blast, the two masses are moving apart with a relative velocity of 60 m/s. the total kinetic energy after the explosion is: A. 21 kJ B. 35 kJ C. 48 kJ D. 56 kJ E. 82 kJ Because of momentum conservation...

**Find the sum**

Can someone how to find the sum and simpliest form of this equation?(x+4)/5+(2x+1)/5 It is not an equation because there is no = sign. It is a expression. You can simplify it a bit by realising it has a common denominator in both terms. This would be 3x+5 ---- 5

**Find the sum of thuis question**

Can someone find the sum for this equation please. (X^2)/(X^2-16)=(5X+4)/(X^2-16) I don't think it is finding the sum, but I can simplify the equation. (X^2)/(X^2-16)=(5X+4)/(X^2-16) First, multiply both sides by X^-16. X^2 = 5X+4 Subtract 5X+4 from both sides. X^2-5X-4 = ...

**factor**

This one was difficult for me aswell:(x+4)/5+(2x+1)/5 (x+4)/5+(2x+1)/5 The common denominator is 5. 1/5 (x+4+2x+1) You should be able to continue this from here. I hope this helps. Thanks for asking.

**I have ONE more**

Factor completely: 2x2 - 32 another math question?? We do not do your homework for you, but I will start you out. 2x^2 - 32 = 2(x^2-16) You should be able to work it from here. I hope this helps. Thanks for asking.

**history**

What is the troubled Caribbean island nation where a president's murder led Wilson to send in the marines and assume American control of the police and finances? Mexico's president was assassinated in 1913. Almost two years later the U.S., under President Wilson, ...

**math B-logarithms**

im having a quiz on this tom and i don't understand it at all! Can sum1 explain it to me?

**I Have To Write A 2 page Essay---HELP PLZ!!!**

I have to write down all the factors in my early life that have influenced the way I developed. Then I have to use those factors in an essay. What factors besides hereditary factors and enviromental factors, can I list? Can you suggest maybe a way to begin my essay? THANK YOU...

**Writing------PLZ HELP--I'M DESPERATE!!**

In writing an essay,what are some factors that have influenced your life? What are some hereditary and enviromental factors that have influenced how you have developed? Please tell us what has influenced YOUR life, and we'll be glad to critique your essay.

**Help Please-Question**

Which sentence is a comma splice? A. While the lawyer prepared the case, her assistant checked the report she found no mistakes. B. Because all the members were early, the meeting got underway ahead of schedule. C. Dr. Matheson,speaking as head of the hospital's medical ...

**Sentences**

What kind of sentence is this: Noah Webster supported himself through sales of his spelling book over 100 million copies of the book were sold. 1.Properly constructed sentence 2.Dangler 3.Run-on 4.Misplaced part We will start with the idea that this is NOT a good sentence. ...

**Beta**

What does beta mean in terms of overall risk to a company? What are the implications for raising equity capital for a company based on beta? Would you merge with high beta or low beta companies? Beta has nothing to do with risk to a company. Beta is a measure of stock price ...

**CAPM or APT**

What is the best approach for a financial professional? CAPM or APT and why? What do those acronyms stand for? ?? (Broken Link Removed) "Best" is a relative opinion. The above cite gives a good analysis of the CAPM and the APT.

**CAPM**

would you ever use CAPM to make personal investment decisions? If so when? If not, why? Yes. I use CAPM to get a general idea of my investment decisions. http://www.investopedia.com/terms/c/capm.asp

**HR outsourcing**

What are the top 4 issues that one should research before making the HR outsourcing decision in an organization I don't know what your book says -- but it seems to me that the top issues are: 1. Will the outsourcing provide the same or better service for the company's ...

**Corporate Finance**

Suppose you have a choice between two corporate bonds, both of which will give you a payment of $1000 in one year assuming that the corporation is able to meet its obligations. One is a bond from General Motors, the other is a bond from Cisco Systems. Which of these two bonds ...