Fiona

Most popular questions and responses by Fiona
1. trig

a hedgehog wishes to cross a road without being run over. he observes the angle of elevation of a lamp post on the other side of the road to be 27 degrees from the edge of the road and 15 degrees from a point 10m back from the raod. How wide is the road??

2. math

a picture framer has a board 10 1/12 feet long. the framer notices that 2 3/8 feet of the board is scratched and cannot be used. the rest if the board will be used to make small picture frames. each picture frame needs 1 2/3 feet of a board. at most, how

3. Chemistry

The equilibrium constant is equal to 5.00 at 1300K for the reaction 2SO2(g) + O2(g) 2SO3(g) if initial concentrations are [SO2] = 6.00M, [O2] = 0.45M, [SO3]= 9.00M, the system is a/. At equilibrium b/. Not at equilibrium and will remain in an un

4. math

trina works after school and on weekends. she always works three days each week. this week she worked 2 3/4 hours on monday, 3 3/5 hours on friday and 5 1/2 hours on saturday. next week she plans to work the same number of hours as this week, but will work

5. Chemistry

Does the reaction between CO2(g) + Mg(OH)2(aq) produce MgCO3(s) + H2O(l) or Mg(HCO3)2 ??? Normally, Mg(CO3)2 but I suspect an excess of CO2 will produce the bicarbonate. For example, CO2(g) + Ca(OH)2(aq) ==> CaCO3(s) + H2O(l) and that is often done by

6. Chemistry

1. What will happen if I add water to a FeSCN+2 solution? FeSCN+2(aq) + H2O(l) ???? 2. Will the equilibrium shift to the left or right? The FeCNS++ is red colored. I think adding water will simply dilute the red color. Won't it react in any way? Small

7. ENGLISH

African slaughter rituals should be allowed in the suburbs

A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block

9. chemistry

The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol. If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the resulting aqueous solution?

10. Chemistry

in the reaction of aluminium and iron (III) oxide to form iron and aluminium oxide, H-850 kJ. how many grams of aluminium oxide are formed when 350 kJ are released? 2Al(s) + Fe2O3 -- Fe(s) + Al2O3(s) H=-850 kJ

11. Physics

A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block

12. Chemistry

When we mix NaOH and H2SO4 we get the equation OH-(aq) + H+(aq) --> H2O(l) and if we mix H2CO3 and NaOH we get the equation 2OH-(aq) + H2CO3 --> 2H2O(l) + CO3-2(aq) Why aren't the two equations the same? ie only one mol of NaOH reacts in the first equation

13. college Finite

Find the probability of at least 3 successes and at least 2 failures. N(trials)=10 and p=3/10

14. Chemistry

Given four unlabeled compounds and four labels (potassium sulfate, potassium carbonate, chromium sulfate, and cobalt bromide) is there a simple test that will allow correct labelling of each compound? I take we are looking for a simple school lab type

15. Chemistry

for the reaction 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) if H = -950kJmol-1, does that mean it's an exothermic reaction? Ooops pressed Post too quickly. Yes it is exothermic. Delta H is negative so heat is lost from the system. If delta H is positive a reaction

16. Chemistry

Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to change Na as a solid to Na

17. Math (Pre-Calc)

Find all the solutions of the equation in the interval {o,2pi) 5sqrt3 tan x+3=8sqrt3 tan x

A 190 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 25.0 cm. Calculate the gravitational potential energy at A also, how do you find kinetic energy if you aren't given velocity? please help me! i would really

19. Math

1.) Which of the following inequalities is true for all real values of x? a.) x^3≥^2 b.) 4x^2≥2x^2 c.) (3x)^2≥4x^2 d.) 2(x-3)^2≥2x^2-3 2.) Which following inequalities is true for all real values of x? a.) x^5≥x^4 b.) 5x^2≥2x^3 c.)

20. Chemistry

I have an assignment Q A 0.1 mol L-1 water solution of NH4CH3CO2 has a pH of approx 7. Explain this using two equations. I have one equation CH3COO-(aq) + H2O(l) --> CH3COOH(aq) + OH-(aq) What could the other equation be? NH4CH3CO2 is the salt of a weak

21. Physics

A person weighs 150 N on the moon. If the acceleration due to gravity on the moon is 1.63 m/s2, what is the mass of the person?

22. math

Explain why 2.15 and -2.15 are opposites.

23. Math 6th

Why do eskimos wash their clothes out tide? (can only be 10 letters)

24. Chemistry

I think I made a mistake with my previous question. I have two solutions potassium thiocyanate (KSCN) and iron (III) chloride (FeCl3). The reaction is Fe+++(aq) + SCN-(aq) FeSCN++(aq) What will happen if the solution is heated? Will the reaction rate shift

25. maths

a swimming pool is 100m long,20 meter wide and 3cm deep.find the height

26. chemistry

The ionic equation and net ionic equation and balance equation: A) Ca(OH)2 + HNO3 --> B) H2SO4 + Na2CO3 --->

27. Chemistry

Do you know the carbon chain lengths for the different states of alkynes? Eg alkanes having a carbon chain length of 1-4 are gases, 5-16 are liquids and 17+ are solids. Are there similar rules for alkynes?

28. Chemistry

If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ? Write the dissociation equation: Ca(OH)2 >>Ca+ + 2OH So the concentration of the OH ion is twice the Ca(OH)2 . Find the concentration of the

29. science

sorry to annoy anyone, but WHAT is the big idea of energy? i would really appreiciate a response In what context? Too much use. Not reneewable? Cost? availability? in the context of an ironsulphide reaction I still don't understand the question. explaining

30. Chemistry

I have an assigment question that I need help with. The Q states that sodium hydroxide absorbs water from the atmosphere. Then the saturated NaOH absorbs carbon dioxide from the air to form a thin coating of sodium carbonate. A piece of sodium hydroxide

31. Algebra 2

Hello! I need help with these four math problems. Thanks so much! :) 1.) ƒ(x) = (x^4)/4 − 3x^3 + (23x^2)/2 - 15x. Find the x values where the extremes occur. 2.) On a 10 question exam each question is worth 10 points (no partial credit). How ways can

32. chemistry

H2 + I2 -> 2Hl 1.2 mol of hydrogen gas reacts with 1.0 mol of iodine vapour, after 5 minutes 0.6 mol of iodine remained. A) calculate the number of moles of hydrogen that have not reacted after 5 minutes. B) calculate the number of moles of hydrogen iodide

33. Physics

Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

34. math

I need help to get started with writing the equation for the following problem: It takes a freight train 2 hours longer to travel 300 miles than it takes an express train to travel 280 miles. The rate of the express train is 20 miles per hour greater than

35. chemistry

Why is a solution of KNO3 neutral and not acidic? K^+ doesn't hydrolyze (H2O has a stronger attraction for the OH- than K^+) and NO3^- doesn't hydrolyze (H2O is a stronger base than NO3^- meaning that H2O will not donate a proton to NO3^-). Looking at it

36. Chemistry

If the oxygen being fed into the system 4NH3(g) + 5O2(g) 4NO(g) + 6H20(g) + 950kJmol-1 is heated, how will the equilibrium shift? The reaction is exothermic, that is gives off heat, or raising the temperature. If heat is added, then the reaction will shift

37. Science (How Do I Do This?)

A car skids to a stop at a traffic light, leaving behind a 8.25m skid mark as it comes to a rest. Assuming that the car is travelling at 14.5m/s and only the friction from the tires on the roadway stop the vehicle. Find the coefficient of friction

38. Physics

Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

39. Physics

1)How much work is done by a person lifting a 2 kg object from the bottom of a well at a constant speed of 2m/s for 5 s. Is the answer mgh=2*9.8*10m 2)A 2kg block slides on a rough horizontal surface. A force (magnitude = 4N) acting parallel to the surface

40. college math213

place parentheses, if needed, to make each of the following equations true: a.5+6.3=33 b.8+7-3=12 c.6+8-2/2=13 d.9+6/3=5

41. Math

The sum of two numbers is 63. One number is 7 more than the other. Find the numbers.

42. College Algebra

Find a pair of positive integers such that the sum of the numbers is 20 and the sum of their reciprocals is 4/15.

43. Algebra

A page should have perimeter of 42 inches. The printing area within the page would be determined by top and bottom margins of 1 inch from each side, and the left and right margins of 1.5 inches from each side. What should be the overall dimensions of the

44. Math

Find the height of the tower to the nearest tenth of a meter. the dimensions are 58 degrees and 36m. [its a right angle triangle]

45. Chemistry

I have a couple of questions I need a hand with: 1. Oxygen has a melting point of -218 degrees celcius and a boiling point of -183 degrees celcius. This means that oxygen would be a liquid at...? Please do not tell me the answer, but tell me the relation

46. English

I'm not sure how to quote a dialogue from a play in my essay. And if it includes a line such as: WALTER(With immense passion) Because it is life, Mama! Do include the part in parethesis?

47. history

When was the Hellenic period in Greece?

48. Chemistry

Electrochemical Cells Out of platinum, iron, carbon and silver which would be the LEAST suitable as an electrode in a standard Fe3+/Fe2+ half cell, and why? Pt usually is the metal of choice for making measurements of this type, because of its inertness

49. Chemistry

Does sodium metal react with potassium hydroxide solution? No. It would be a displacement reaction and this only works if the metal is higher in the activity series than the one it wants to displace. Given that potassium is the highest ranked metal (sodium

50. Spanish 2

Re-write the sentences in Spanish. Are my answers correct? Thanks! :) 1.) I used to eat. 2.) Clean!! 3.) You (informal) have seen the movie. 4.) I practiced yesterday. 5.) When I was young, I played soccer. My answers: 1.)Yo solía comer. 2.)Limpio!

51. Algebra 2!

1.) ƒ(x) = (x^4)/4 − 3x^3 + (23x^2)/2 - 15x. Find the x values where the extremes occur. 2.) On a 10 question exam each question is worth 10 points (no partial credit). How ways can you make a 70%? 3.) Write the polynomial in standard form. Then

52. MATH

How do you go about finding equations to a given solution set?

53. Chemistry

If 2 g of salicylic acid is heated with 4 g of acetic anhydride, what is the theoretical yield ? C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O3

54. Language Arts/Poetry

In the poem "Parade" by Rachel Field, what details in the poem describe the town? The only thing I see is the elm trees and the grass. Can you help me?

55. Chemistry

I'm trying to work out the equation for when ammonia solution is added to zinc hydroxide solution. I think a precipitate forms. [Zn(OH)4]2- + NH3(aq) + H2O(l) --> ???? Zn(OH)2 + 4NH3 ==> Zn(NH3)4(OH)2 The Zn(OH)2 forms a soluble complex ion with NH3.

56. Chemistry

What sort of chemical test can be performed to identify from two unlabelled powders which one is zinc hydroxide and which one is aluminium hydroxide? Look up the determination of metals with dithizone. I believe Zn gives a colored complex when extracted

57. Chemistry

I have two substances potassium sulfate and potassium carbonate. They are unlabelled and I need to know which one is which. If I add HCl to each substance ie K2SO4(s) + 2HCl(aq)-->2KCl(aq) + H2SO4(aq) K2CO3(s) + 2HCl(aq)--> 2KCl(aq) + H2O(l) + CO2(g) What

58. Chemistry

In the reaction 2H20(aq) --> O2(g) + 2H20(l) why doesn't increasing the pressure of oxygen have any effect on the reaction rate? Balance the equation first. What you have isn't balanced. Frankly, it doesn't look possible. You have two mols H2O on each

59. algebra

I know that 10^-2.3=5.0 * 10^-3 How do I get 10^-2.6 in the same form as 5.0 * 10^-3? please and thank you! Punch in 10 on your calculator, then press the yx button followed by -2.6 and then press equal. You should get 2.51E-3 thanks, but mine just says:

60. Chemistry

If barium nitrate solution is added to sodium hydroxide solution does a precipitate form? Are there exceptions? I have an assignment Q that asks about the precipitate, and I thought that Ba(OH)2 was soluble. Barium hydroxide is moderately soluble, up to

61. chem

For this problem, will someone please check my answer? How many grams of oxygen are produced in the decomposition of 5.00g of potassium chlorate? KClO3(s)--->KCl(s)+O2(g) [the equation may not be balanced] My answer is 1.96 g of O2. The balanced equation

62. Math

Condense the expression to the logarithm of a single quantity. 5lnx-6ln(x+2)

63. Algebra

Okay, so! I figured out how to get the Point-slope form to the question I was given which led me to y+3 =-2(x+1), but, now I'm stick on finding the Slope Intercept form to get my answer. Can someone help me? Thanks!

64. encryption

Show that the active CCA against ElGamal encryption given in the lecture does not work when against the Cramer-Shoup encryption.

65. Math for educators

Help please! What is the domain and range for the following numbers 2.68, 2.58, 2.38? Thank you

66. Math

Find two numbers for which the sum is 51 and the difference is 13.

67. financial management

For a tuition of 20,000 now, how much will i need to save if my child is 5yrs now and will go to college for 4 yrs in the 13 yrs?

68. Algebra 1

How do you solve this? Thanks! y+3 = -2(x+1)

69. Math

Write this equation as a logarithm of a power: w ln 4

70. chemistry

Determine the of mole of water molecules in one mole of a sample of an iron containing (nh4)2so4. FeSO4. nH2O. titrate a solution of the iron containg (solution Y)

71. Chemistry

Name one difference between acids and bases in terms of: -Their chemical formula -A property Any help would be awesome.

72. I DONT KNOW

WHAT IS THE DEFINITION OF ANTHROPOLOGY

73. history

Why did Alexander go to India? Was it for gold? Did he conquer any cities there or name any after himself? Thank you.

74. history

Where did Cleopatra die? Thanks much!

75. Chemistry

What is the suffix for an alcohol which contains more than three -OH groups?

76. math

how d you turn the roman numeral number DCCXXXI into a regular number?

77. math

how d you turn the roman numeral number DCCXXXI into a regular number?

78. Chemistry

If a colourless liquid with a pungent odour is added slowly to another colourless liquid, a dark brown precipitate is produced that later dissolves to produce a colourless solution. What are the two colourless liquids?

79. Chemistry

If the hydrochloric acid is warm, is the following equation correct? 2HCl(aq) + Na2SO3 --> 2NaCl(aq) + SO2(g) + H2O(l) yes, correct.

80. Chemistry

How does one calculate the pH of a solution that is only 1.84% ionised? determine the concentration of the H+, which will be in a monoprotic acid, concentration * decimal percent. then determing pH in the normal way.

81. Chemistry

When asked to name all of the ions and molecules present in a 0.1 mol L-1 solution of CH3COOH, why are there OH- ions present if the equation is CH3COOH(aq) + H2O(l) --> CH3COO-(aq) + H3O+(aq) ? The water ionizes in such a manner that the product of the

82. algebra

does log base of 4 sqrt(t/s)=1/2log base of 4 t - 1/2log base of 4s? sqrt=square root thanks yes yah thanks!

83. Maths

John leaves point A to travel 360klm and Joanne leaves point A 40 mins later and her cars speed is 18klm per hour faster than John's but they both arrive at the same time. What is their respective speeds? The both travel the same distance.

1. Algebra

Does anyone know the answers to the Unit 5 Lesson 10 quiz?

posted on May 7, 2018
2. math

fgt gtf tfg ftg tgf gft

posted on September 26, 2017
3. math

go gy gp gb gs og oy op ob os yg yo yp yb ys pg po py pb ps bg bo by bs sg so sy sp sb

posted on September 26, 2017
4. math

fgt gtf tfg ftg tgf gft

posted on September 26, 2017
5. chemistry

1.7

posted on September 19, 2017
6. Math

5/12+5/9

posted on April 13, 2017
7. Algebra

f(3)-g(3)=[(3)^2-13]-[11-(3)] =(9-13)-(11-3) =(-4)-(8) =-12

posted on September 20, 2016
8. Science

It should be B. It is a type of Negative Feedback Loop

posted on September 20, 2016
9. chemistry

Did you ever figure this out? I'm doing that assignment right now and don't get it

posted on June 17, 2016
10. Physics

posted on March 16, 2016
11. social studies

Thanks for the help!

posted on February 29, 2016
12. tourism.geography.maths lit.history

You can do social worker teaching jaurnalism laywer nurse also police

posted on February 23, 2016
13. tourism.geography.maths lit.history

I wana be a social wor ker or a teacher is it possible with those subjects?

posted on February 20, 2016
14. Social Studies

Ms. sue he means federal

posted on November 12, 2015
15. Algebra

@ MathMate, Here is the original question; Write the equation of the line with slope -2 that passes through the point (-1, -3) in slope-intercept form. But I've tried to figure out how to do it and I'm literally stuck.

posted on September 15, 2014
16. Spanish 2

Whoops! For #3, that was my other answer. My real answer is: Hicieron los deberes de ayer.

posted on May 19, 2014
17. Spanish 2

@Sra, I did these three as well. 1.) You and I went to the movie. 2.) We used to go to the park. 3.) They did the homework yesterday. My answers: 1.)Usted y yo fuimos al cine. 2.)Solíamos ir al parque. 3.)Solía ​​comprar libros para los estudiantes.

posted on May 19, 2014