# Katherine

Questions and answers by visitors named Katherine

## Questions

2. ### 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

3. ### Under standard conditions (298 K and 1 atm), which statement is true?

a] diamond converts to graphite spontaneously b] graphite converts to diamond spontaneously c] none of the above How can the spontaneity of the reaction be reversed? a] increase the

4. ### Indicate the number of equivalents in each of the following:

4mol Mg2+ 0.1mol H+ 2mol Cl- 3mol Fe3+

5. ### For the reaction described by the chemical equation:

3C2H2(g) -> C6H6(l) .. Delta H rxn = -633.1 kJ/mol a) Calculate the value of Delta S rxn at 25.0 C... b) Calculate Delta G rxn... c) In which direction is the reaction, as written, spontaneous at 25 C and

6. ### Combine the sentences by changing the italicized word group to an infinitive or infinitive phrase. Then write the complete sentence in the paragraph box.

The weather bureau uses balloons. They determine the temperature aloft. (They determine the temperature

7. ### Choose the correct rewriting of this algebraic fraction and give the exclusion represented by your choice.

4y(8y+24)^ - 1 : 2y/2y+3 OR y/(2)(y+3)? y ≠ : +3 OR -3 ?

8. ### 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

9. ### Is it even possible to guess the signs of Delta H, S, and G from only knowing the following information?:

- Silica gel is a solid. - Chemically inert. - Highly porous. - Amorphous form of SiO2. - Water vapor is absorbed onto the surface of silica gel and

10. ### 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

11. ### At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct?

For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] = [OH-]? pH = 7.00 and pOH =

12. ### A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is:

CaCO3(s)+2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g) The excess HCl(aq) is titrated by 9.75 mL of 0.125 M NaOH(aq). Calculate the mass

14. ### 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?

16. ### an empty rectangle tank with a base area of 2400 cm^2 is filed with water from 2 taps. one tap can fill the tank with 12L of water per minute, while the other tap can do it at 3l less perminute.

(A) what will be the depth of water in the tank after both

18. ### So I did a lab determining the chemical formula of a hydrate. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this:

Mass of clean, dry test tube: 21.6g Mass of test tube + hydrated

19. ### 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

20. ### 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!!!!!!!

21. ### 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

22. ### Using the following data calculate Delta Sfus and Delta Svap for K in J/mol-k

Tm(K) = 336, Delta H Fus(kJ/mol) = 2.33, Tb (K) = 1033, Delta H vap (kJ/mol) = 77.1 For Delta S fus i'm supposed to use 336 K the Tm value and for Delta S vap i'm supposed to use

23. ### The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John.

(A) How many postcards did Zachary have

24. ### Sevnety-eight players entered a single elimination tennis tournament.How many matches were played to determine the overall champ?

please help me...and if u get the answer can you explain how you got it with a rule or a pattern

25. ### Daniel gave 4/5 of his stickers to Javier. Javier’s collection of stickers increased to 64. If Javier had 28 stickers in the beginning, how many stickers did Daniel have in the beinging?

can u please show the work and explain how u got it...so i could

26. ### every row and column contains the same numbers and the same math signs, but they are arranged in a different order each time. can you find the correct order to arrive at the finals totals shown.

only using 4 8 3 5 and * + - to make 31 15 20 21 9 17 11 27

29. ### What word best describes people with shared customs, languages, or background?

A. ethnic group B. immigrant C. multicultural D. population

32. ### So I was doing homework and I have to make sentences with these words

• open • feed •them •bag •Jessica •smell •ian •animal •uphold •maya •dust And I have to take out at least two words, I've been stuck on this question for at least

33. ### Well, I now need help with math as well..

What exclusions are placed on the variable x for the fraction: 4x^2-1/4x+2 ?

35. ### Combine the sentences by changing the (italicized) word group to an infinitive or infinitive phrase. Then write the complete sentence in the paragraph box.

I need help with these too: #1. Bob used raspberry flavor in the cod liver oil. (It masks the taste

36. ### I am not sure how to answer this can someone please explain it to me:

Find a polynomial with integer coefficients that satisfies the given conditions. P has a degree 2, and zeros 1+i and 1-i Thank You!

38. ### Can someone help me with this problem.... i have an exam coming tomorrow and im doing practice problems but i dont know how to do this

Calculate the specific heat of a metal if 2.36102 grams of it at 99.5 degrees celsius is added to 125.0 mL of water at

Thank you!

40. ### Which factors led to the downfall of Ghana? Select all that apply.

A. Ghana was engaged in conflict with people to the north. B. Ghana lacked nearby water resources. ******* C. Ghana was unwilling to participate in trade. D. Ghana's large population began

50. ### Hi, I am currently working on a project for this poem:

Because I wanted to write a poem that would make me push away from the table & say Damn, & turn my face, even though I never say that word. Say Look, this is your saddest thing. That’s all. Your first

51. ### Hi I have a question about my homework but my teacher doesn't explain to us very well so if someone can help me out.. iw ould appreciate it. Thank you.

Find the quotient and remainder for x^5-x^4+7x^3-7x^2+5x-10/ x-1 thank you so much (:

52. ### What is the base 7 representation of the number 275?

21201 is the base 3 representation of what number? I'm having trouble with both questions. Can someone help me out? I tried using the internet but I was still confused.

53. ### Which of the following is not considered part of the "golden age" of microbiology?

A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Please do not guess I chose C but i think it was wrong

54. ### Which of the following is not considered part of the "golden age" of microbiology?

A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Who determined Archaea are the third domain of life? A.Carl Woese

58. ### I am doing a collage about Fahrenheit 451 and basically we have to make a collage with chunks of writing about quotes that relates back to our proposal. Would It be okay if someone looked at it?

Proposal: I am interested in how the government doesn’t want

61. ### I just have a stupid question..

Does the phoenix in Fahrenheit 451 symbolize any type of freedom? Because I searched online, but it mostly says rebirth. But could it?

62. ### I have to write a short silent play and I'm having trouble coming up with ideas. Can someone help?

Its suppose to be in this format. 1. reveal information 2. raise the stakes somehow 3. have the character do something irrevocable s/he cant take back 4. top

63. ### Suppose I use a scale on my map where every 3 inches on my map represents 5 miles. If a region on my map has an area of 45 square inches, what is the area of the actual region it represents?

hi I need help with this question, I don't know what to do. thanks

64. ### Let v be the vector <12,5> and let w be the vector <-4,3>. What is ||v||?

Can someone help me, I am having trouble with the question. Thank you!

66. ### Triangle ABC has the side of lengths of 6,8,9.

HGI is similar to ABC which has the side length of 12, 8, and its missing one length. What is the missing number. Can someone explain how to find that number.

67. ### Self-Interview

"I have always understood that's why I have been so frequently called 'a revolutionist.' It sounds as I have done some crime! Well, it may be the American black man does need to become involved in a real

68. ### Self-Interview

"I have always understood that's why I have been so frequently called 'a revolutionist.' It sounds as I have done some crime! Well, it may be the American black man does need to become involved in a real

74. ### Why does Yoni think the Arab he finds is perfect for his film?

It was in Bethlehem, actually, that Yonatan found his Arab, a handsome man who used his first wish for peace. His name was Munir; he was fat with a big white mustache. Superphotogenic. It was

79. ### True or false? Negative numbers are closed under addition. Give a counterexample

True or false? Prime numbers are closed under subtraction. Give a counterexample True or false? Natural numbers are closed under division. Give a counterexample

80. ### So i was going over a problem that i didn't understand which is What is the slope of the function described in the table below?

x I y 0 | -3 2 | -2 4 | -1 6 | 0 the choices were f) -3 g) 1/2 h) 2 J) 3 i know that the answer is g because my family told me

82. ### Which of the following is equivalent to the expression 8 to the -5 power times 8 to the second power

A) 1/8 to the 7 power B) 1/8 to the 3 power C) 8 to the 3 power D) 8 to the 7 power I was in between b and c but im pretty sure its c is it?

84. ### Which of the following sentences contains a dependent clause?

a) my mother, who never wastes anything, rinsed and saved the take-out boxes b) we were running late and, we had to skip stopping by the post office. c) I had never been to New York before this

85. ### Which of the following sentences contains a dependent clause?

a) my mother, who never wastes anything, rinsed and saved the take-out boxes b) we were running late and, we had to skip stopping by the post office. c) I had never been to New York before this

What is the

87. ### What is the pattern of stressed and unstressed syllables in this line:

The sun should drop its greatest gold

88. ### Which statement is true?

A. Every rational number is a square root. B. Every irrational number is a fraction. C. Every rational number can be written as a fraction. D. Every square root can be written as a whole number I go with C

91. ### The question is as follows:

went wrong, I'd really appreciate it!

93. ### what is the vascular system of the lilac flower. i tried finding some sites.

some sites would help me. PLease!

94. ### Describe the vascular system and functions of each component of the Lilac flower

i tried to find some sites, but i cant find in any. So any sites would help as well

95. ### need help on a lab

here are the results Mass of empty beaker and glass rod(62.62) Mass of beaker, glass rod, hydrated copper sulfate(66.02) Mass of beaker, glass rod and anhydrous copper sulfate(65.04) Mass of hydrated copper sulfate(3.4) Mass of anhydrous

96. ### So I did a lab determining the chemical formula of a hydrate. I really just need somebody to check this over for me. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this:

Mass of clean,

97. ### A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C.

The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as

99. ### The heart is a _____ that provides the force necessary to circulate the blood to all the tissues in the body.

A. Skeletal pump B. Autonomous pump C. Muscular pump D. Systemic pump My answer would be C. i think that's right...

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