Saturday
October 25, 2014

Posts by Roxanne


Total # Posts: 39

Chemistry
If 3.943 g of anhydrous salt remains after heating 5.00 g of CuCℓ2·xH2O, determine the number of molecules of water of hydration in the original hydrate.
February 24, 2014

art
Renaissance thinkers promoted _______, individualism, and secularism.
February 4, 2014

chemistry
5. Identify whether the following reaction is an oxidation or a reduction. a. Ni2+ + 2e- ¨ Ni b. 2Br- ¨ Br2 + 2e- c. O2 + 4e- ¨ 2O2- d. Zn ¨ 2e- + Zn2+ e. H2 ¨ 2H+ + 2e-
July 26, 2013

Magnetism 8.02x
can u also give the answer for part c)??
June 14, 2013

minning science
calculate the pH at 25 degrees of 0.080 mol dm^-3 HNO3
March 9, 2013

Chemistry
What is the expected mass of anhydrous salt formed after the waters of hydration of CoCl2·6H2O are driven off completely by heating, resulting in a mass loss of 2.000 g water?
March 3, 2013

computer information
I am tring to find as much information on the digital Divide in the USA?
January 22, 2013

Chemistry
How much heat in kilojoules is needed to bring 1.49 kg of water from 28.1 to 97.1 °C (comparable to making four cups of coffee)?
May 26, 2011

Chemistry
Consider the reaction: N2(g) + 3H2(g) ¡ú 2NH3(g) question: calculate ¦¤S¡ã in J¡¤K-1.
May 26, 2011

Chemistry
Calculate ÄG°373 in kJ for the following reaction at 100 °C, using data from your text. 5SO3(g) + 2NH3(g) --> 2NO(g) + 5SO2(g) + 3H2O(g) Enter your answer in decimal form, including the sign.
May 26, 2011

Chemistry
Using data in table below and S °(NaCl(s))= 72.38 J·mol-1·K-1, calculate ÄfS° for NaCl(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) ...
May 26, 2011

Chemistry
Using data in table below and S °(NaCl(s))= 72.38 J·mol-1·K-1, calculate ÄfS° for NaCl(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) ...
May 26, 2011

Chemistry
How many joules of heat are needed to increase the temperature of 18.4 g of silver from 17.0 to 41.0 °C?
May 26, 2011

Chemistry
A 7.2 ´ 10-3 M solution of acetic acid is 5.0% dissociated. In a 7.2 ´ 10-4 M solution, the percentage of dissociation would be a. the same. b. >5%. c. <5%. d. zero. e. none of these
May 26, 2011

Math
Need Help Please Solve the linear equation 2x/5-x/3=3
February 13, 2011

Math
A deli offers its cheese sandwichs with various combinations of mayo, lettuce, tomatos, pickles, sprouts. 11 types of cheese are available. How many different cheese sandwichs are possible. * You can only use one type of cheese on each sandwich...
February 13, 2011

math
Each prize for a carnival booth cost $0.32. how many prizes can you buy with $96?
January 11, 2011

Physics
A 2.1 mm-long, 0.46 mg house flea can reach a height of 17 cm in a single leap. I've found that, neglecting air speed, v = 1.8 m/s How do I calculate the kinetic energy of this flea at takeoff & its kinetic energy per kilogram of mass? (to get K = __ J) Thanks for helping!
November 24, 2010

Physics
For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.1 mm-long, 0.46 mg critter can reach a height of 17 cm in a single leap. A) Neglecting air drag, what is the takeoff speed of such a flea? I don't understand how I can find the ...
November 24, 2010

economics
Suppose the USA and Canada are considering to trade. Assume there are only two goods in the economy: wheat and corn. The table below illustrates what each country can produce in a given year. Wheat Corn USA 4 2 Canada 5 8 In this case, which country should produce wheat? Why? ...
November 21, 2010

business
Describe how to accommodate WritePoint submission and feedback time
October 20, 2010

English: Vocab
Ironic is like coincedence
October 13, 2010

History
Thank You!!! Quick question are all these subtitles in this article part of this article?
September 1, 2010

History
Do you know of an article that is no older then 2 years that's about Latin America's geography?
September 1, 2010

sociology
Do modern trends favor the solution of social issues?
June 9, 2010

Taxation
81. Joe operates a business that locates and purchases specialized assets for clients, among other activities. Joe uses the accrual method of accounting but he doesn’t keep any significant inventories of the specialized assets that he sells. Joe reported the following ...
May 31, 2010

geology
It is a power point presentation. Just needed another pair of eyes to look at it. Thank you for your help.
January 3, 2010

geology
Is there any way I can send you my final to look at and see if I am on the right track? I asked my instrutor to look at it, but her reply was she didnt want to see it until it was due. Any help would be greatly appreciated. Thank you.
January 3, 2010

world history
What exactly is nationalism and why did it grow as much as it did in the 19th century?
September 23, 2009

MATH
0.42 -0.163
October 31, 2008

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its densiry is 2.70E3 kg/m3 and the unit cell volume is 6.64E-29 m3. Calculate the molar mass (g/mol) of the element to 3 significant figures.
February 4, 2008

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its densiry is 2.70E3 kg/m3 and the unit cell volume is 6.64E-29 m3. Calculate the molar mass (g/mol) of the element to 3 significant figures.
February 4, 2008

Chemistry
An element has hcp packing with a hexagonal unit cell. the volume of the unit cell is 5.71E-26 L. Calculate the density (kg/m3) of the element.
February 4, 2008

Chemistry
My answer that i got is 5.99E22 i followed your step all the way till the periodic table.. from there i got Sc atomic mass as 44.96 g then i multiply it by i atom/7.50E-22 then i got the answer 5.99E22....is my steps and answer correct?
February 4, 2008

Chemistry
The element Sc has hcp packing with a hexagonal unit cell. The density of scandium is 3.00E3 kg/m3 and the cell volume is 5.00E-26 L. Calculate the value of Avogadro's number to 3 significant figures based on these data. Note: the value may differ from the listed value.
February 4, 2008

chemistry
A sample of O2 gas is placed in a sealed 1.00 L flask and pressure is measured as temperature is changed. The data are plotted and the slope of the resulting line is equal to 0.00500 atm/K. The line passes through the origin of the graph. There are g of O2 gas in the flask. (R...
January 31, 2008

precalculus
(2y+1)(y+3)(5y-2)=0 If A x B x C=0, then A, B, or C are equal to zero. Therefore, for the problem, 2y+1=0 y+3=0 5y-2=0 Solving the equations for y will give the correct answers (three of them) for y.
March 7, 2007

precalculus
(y+1)(y+3)(5y-2)=0 That is an equation. What is the question? Are you supposed to multiply it out or say what the solution values of y are?
March 7, 2007

science
Can anybody please tell me 3 behavioral adaptations of organisms please and thank you http://www.paulnoll.com/Oregon/Birds/climate-behavioral-adaptations.html
November 16, 2006

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