Roxanne

Most popular questions and responses by Roxanne
  1. 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?

    asked on March 3, 2013
  2. 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

    asked on November 24, 2010
  3. 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.

    asked on February 24, 2014
  4. 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

    asked on May 31, 2010
  5. world history

    What exactly is nationalism and why did it grow as much as it did in the 19th century?

    asked on September 23, 2009
  6. American Government

    The fabric of American empire ought to rest on the solid basis of the consent of the people. the streams of national power ought to flow from that pure, original foundation of all legitimate authority. 1) which of the following constitutional principles

    asked on February 8, 2017
  7. 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.

    asked on February 4, 2008
  8. 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-

    asked on July 26, 2013
  9. Math

    John is thinking of a number in the hundred thousands the first digit is equal to the number of digits in the number. the number has twenty tens and twice as many thousands. the number of ones is an odd number that is less than five and greater than the

    asked on September 27, 2016
  10. Chemistry

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

    asked on May 26, 2011
  11. 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)

    asked on November 24, 2010
  12. 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

    asked on November 16, 2006
  13. art

    Renaissance thinkers promoted _______, individualism, and secularism.

    asked on February 4, 2014
  14. math

    Each prize for a carnival booth cost $0.32. how many prizes can you buy with $96?

    asked on January 11, 2011
  15. 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

    asked on November 21, 2010
  16. 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

    asked on February 4, 2008
  17. 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)?

    asked on May 26, 2011
  18. 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.

    asked on February 4, 2008
  19. minning science

    calculate the pH at 25 degrees of 0.080 mol dm^-3 HNO3

    asked on March 9, 2013
  20. 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.

    asked on May 26, 2011
  21. 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) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8

    asked on May 26, 2011
  22. 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) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8

    asked on May 26, 2011
  23. 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...

    asked on February 13, 2011
  24. MATH

    0.42 -0.163

    asked on October 31, 2008
  25. 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.

    asked on February 4, 2008
  26. computer information

    I am tring to find as much information on the digital Divide in the USA?

    asked on January 22, 2013
  27. 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.

    asked on May 26, 2011
  28. 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

    asked on January 31, 2008
  29. sociology

    Do modern trends favor the solution of social issues?

    asked on June 9, 2010
  30. 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 didn't want to see it until it was due. Any help would be greatly appreciated. Thank you.

    asked on January 3, 2010
  31. 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.

    asked on March 7, 2007
  32. 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?

    asked on May 26, 2011
  33. Math

    Need Help Please Solve the linear equation 2x/5-x/3=3

    asked on February 13, 2011
  34. business

    Describe how to accommodate WritePoint submission and feedback time

    asked on October 20, 2010
  35. History

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

    asked on September 1, 2010
  36. 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?

    asked on March 7, 2007
  1. math

    36 miles

    posted on December 12, 2016
  2. stats

    Step 1: Hypotheses: Ho: µ ≥ 26 Ha: µ < 26 Step 2: One sample T- test t = (ȳ - µ) / (s/√ n) Step 3: P- Value method tcdf(p-value, 99,df) Step 4: reject or not reject null hypothesis

    posted on August 7, 2015
  3. stats

    t-test is used because it is quantitative, z-test is used for categorical for these type of stats.

    posted on August 7, 2015
  4. college physics

    a) F(unknown)= 2.5N + 1.0N b) F(unknown)= .5N +1.0N c) F(unknown)= 0N + 1.0N

    posted on May 11, 2015
  5. Physics

    can u also give the answer for part c)??

    posted on June 17, 2013
  6. English: Vocab

    Ironic is like coincedence

    posted on November 18, 2010
  7. History

    Thank You!!! Quick question are all these subtitles in this article part of this article?

    posted on September 1, 2010
  8. geology

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

    posted on January 3, 2010
  9. 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?

    posted on February 4, 2008