# chemistry! URGENT

61,409 results, page 4

1. ### World Geography URGENT!

What are the main economic activities for Switzerland?
2. ### Chem Urgent!

Does anyone here know anything about bowel movements?
4. ### english(URGENT)

What is the message of the heart and soul of Harper Lee?
5. ### CHEM..URGENT!

What is produced at each electrode in the electrolysis of NaBr(aq) and AgF(aq)?

7. ### Career Urgent

I read it but still couldn't figure out why do you business?
8. ### Algebra 2 URGENT

Simplify: 1/u^2-2u-1/u^2-4 Please Show All Work!
9. ### Algebra 2 URGENT

Simplify: x+2/x^2+x-2/2x Please Show All Work!
10. ### Algebra 2 URGENT

simplify cubed root of 375 a to the 5 power

Simplify cubed root of 135
12. ### To Ms. Sue urgent

So do I have to write every country down??
13. ### Math (URGENT)

Solve. 4(-1^2) = ? My calculator says its -4 I got +4 Help Please.
14. ### Science(URGENT)

How is solar energy used in space? (for what purpose?)
15. ### Precalcus Urgent HELP PLEASE

Evaluate the function at the indicated value: g(x) = 3-x/3+x g(a-3)=

17. ### Biochemistry

Calculate the deltaG0 for the oxidation of ethanol by NAD+. Urgent Thank You
18. ### science urgent!

What are the organic and inorganic properties of soil, Describe.
19. ### math URGENT

Multiply.Express each answer in its simplest form. what is 1/3 x 1/2
20. ### MATH urgent

Hello!! 1. find the third derivative of f(t)=(t-1)/(t+1) 2. y= x^(x^2) ; dy/dx please help! thank you!
21. ### differential equation urgent !

using method of undetermined coefficients d^2y/dx^2 -5 dy/dx+6y=xe^x
22. ### maths- urgent

show that √Π+1 is irrational if there is any proof
23. ### maths -urgent

Find SP, if market price= Rs. 70 and commission =10 percent
24. ### Math- Urgent

15=y+24 What does y equal? Please show all work.
25. ### Math- Urgent

1/4 w=13 What does w equal? Please show all work.
26. ### Math- Urgent

2e= 4e-16 What does e equal? Please show all work.
27. ### Math - Urgent

3/4x+2=7+1/3x What does x equal? Please show all work.
28. ### Math - Urgent

3-2/9b=1/3b-7 What does b equal? Please show all work.
29. ### Math - Urgent

3-2/9b=1/3b-7 What does b equal? Please show all work
30. ### Math - Urgent

2/3x+1/2x=5/6+2x What does x equal? Please show all work.
31. ### Math HELP URGENT!

Find the LCD of the ration expressions: A) [9x/(x^2-z^2)] [3/(x^2-2xz+z^2)] B) [x/(x^2-64)] [2/(40-5x)] [7/x]
32. ### Math- urgent

-4x-2+3x=4 What does x equal? Please show all work.
33. ### physics(URGENT!!!!!)

8.01xers Can anybody help with the falling ruler. I submission left(
34. ### Algebra, URGENT!! HELP!

Rewrite the following as a perfect square: 144b^18
35. ### Math- urgent

How do you find the sine, cosine, and tangent of a triangle?
36. ### Urgent Calculus Help 2

Find the equation of the tangent line to the graph of f(x) = 6x ln(x + 4) at x = 2.
37. ### math(urgent)

Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6) +.... Answer this Question
38. ### Calculus(URGENT PLS!!!)

Find the integral of (e^cosx)sinx
39. ### Math (Need help Urgent)

1. Graph the solution to the inequality y ≤ -2(x - 2)2 - 2 ?
40. ### Urgent math

Express the repeating decimal as a fraction. 0.156156156...
41. ### math plz its urgent

what values of the function y=-2x -4 for x= 0, 1, 2, and 3? A. 0,-6,-8,-10 B.-4,-6,-8,-10 it think its this one? C -4,-2,0,2 D. 0,6,8,10
42. ### Science! NEED HELP URGENT

What effect does amplitude have on velocity?
43. ### Chemistry Urgent

Calculate the DHof for the following reaction under standard state conditions: 2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) + O2(g) Given the following information: Ag2S(s) ÄHof = -32.6 kJ/mol H2O(l) Ä Hof = -285.83 kJ/mol H2S(g) ÄHof = -20.6 kJ/mol
44. ### URGENT Chemistry question

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of product with no ...
45. ### Chemistry URGENT

consider the following container of helium at 45C. intially the valve is closed. After the valve is opened what is the pressure of the helium gas. your start points are 2.00 atm and 9.00L. after opening you have 3.oo atm and 3.00L. The answer is 2.25 atm what formula did you ...
46. ### Chemistry re-post URGENT

Chemical analysis reveals capsaicin to contain 71.0% of carbon, 8.60% hydrogen, 15.8% oxygen and 4.60% nitrogen. a) Determine the empirical formula of capsaicin b) Each molecule contains one atom of nitrogen. What is the molecular formula of capsaicin? I figured out the ...
47. ### Chemistry URGENT! I really need help!

Consider the following reaction occurring at 298K BaCO3(s)-> BaO(s) + CO2 (g) show that the reaction is not spontaneous under standard condition by calculating delta G rxn. I calculated delta G and got 219.7 kJ, now the question asks if BaCO3 is placed in an evacuated flask...
48. ### Chemistry Urgent

Assuming that kerosene is C11H24, calculate the standard enthalpy change when 1 mole of kerosene burns completely in oxygen, using the data below: ΔH of formation of C11H24(l) = -327 kJ mol ΔH of formation of CO2(g)= -394 kJ mol ΔH of formation of H2O (l)= -286 ...
49. ### Chem Urgent!

How do I determine the number of moles for the substance: 3.5 x 10^23 molecules H2O?
50. ### Chem Urgent!

How can I divide this answer Pb2(SO4)2 it needs to be simplified by 2)?
51. ### math urgent!

find the eq to the tangent line to the curve y=x^3 g(x) at x=1 if g(1)=2 f(1)=3 f'(1)=1 g'(1)=-2 i cant understand how the answer is y=4x-2
52. ### ICT

can anybody get me a collection of data of a movie!!!plzzzzzzzzzz..............its urgent thxx... xxx
53. ### global ...help urgent

why does jewish law prohibit the eating the flesh of the pig?
54. ### CALC URGENT

find the area enclosed by the curves y=absolute value of x and y=x^2+2
55. ### science urgent

What role does water play in erosion, weathering or deposition?
56. ### earth science - urgent

What are the differences between asteroids and meteoroids? What are the similarities?

58. ### Algebra 2 URGENT

Simplify: 2x+5/4x^2+2x-5/10x Please Show All Work!
59. ### Algebra 2 URGENT

Simplify: 2x+5/4x^2+2x-5/10x Please Show All Work!

64*15 divided by 56 rounded by precentage ( % 's ) help please urgent!!!
61. ### physics- urgent

an object travels at a rate of 48.5 km/sec. how many cm/min would that be
62. ### math urgent!

find the values of x and y that solve te following system of equations 3x+2y=-22 5x-9y=25

What is the maximum value for 5sin(5t-pie)

65. ### URGENT math rate of change

The points (-1,2) & (4,y) have a slope of -4/5. What is the y coordinate for (4,y).?
66. ### Math (Urgent)

Use the Midpoint Rule to approximate the integral (–10x+7x^2) from 10 to 17 with n=3
67. ### Math (URGENT)

How to graph: y=x(x-4) Calculator shows the vertex at (2,-4) Can someone explain why? Thanks.
68. ### urgent math

complete the square to write each function in the form f(x)=a(x-h)^2+k f(x)=2x^2-20x-3
69. ### Math (Urgent)

Label exact values for all x and y intercepts. Q1: f(x)=x^3-2x^2-5x+10 f(x)=X^2(x-2)-5(x-2) f(x)=(x-2)(x^2-5) f(x)=(x-2)(???) Q2: f(x)=x^4-5x^2 f(x)=x^2(x^2-5) f(x)=??? please help and thank you
70. ### math VERY URGENT

Are there any websites where i can make a 3d shape and see the net for it?
71. ### Algebra URGENT

Write an equation of a line perpendicular to y=2x+3 and passes through (3,4).
72. ### maths-urgent

construct a triangle PQR with base PQ = 8.4 cm , angle P = 45 degree and PR - QR = 2.8 cm
73. ### differential equation urgent !

using Method of variation of parameter y''+y = tan^2 t
74. ### algebra URGENT HELP

x+14/x-8 ≥ 1 solve and write solution in interval notation
75. ### algebra URGENT HELP

7x-6 greater than or equal to -3x^2 reduced and written in interval notation
76. ### Urgent

3) List 3 strategies to help escape riding in a vehicle with an impaired driver.
77. ### Urgent Spanish Check

Nando es ____________________ alumno muy ambicioso. Un
78. ### Urgent Spanish Check

_________ postres son deliciosos. El, La, or Las? La?
79. ### Urgent Spanish Check

Hay (There are) ________ gatos en la casa. Las?

Find the sum to infinity of the series 1 + 4/3! + 6/4! + 8/5!

Find the sum to infinity of the series 1 + 4/3! + 6/4! + 8/5!
82. ### MATH URGENT

find the average rate of change between f(-4) and f(-1) in the function f(x)= x^2+2x-8
83. ### simultaneous equation very dificult need help itz urgent

A-C=B/2 A-B=C/6 B+C=32 find A,B,C
84. ### math urgent

Prove: TanA+2Tan2A+4Tan4A+8Cot8A=CotA

I need to find the order of a reaction with respect to the reactants. I set up my equation like this: 5.33e-2 M / 2.66e-2M = 1.03e-2 / 1.93e-3 I did the concentrations equal to the rates. I am just not sure what the units for rate should be. 2.00 = 5.33^m Did I set this up ...
86. ### chemistry urgent

NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 45.5g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 29.0∘C, ...
87. ### Chemistry URGENT

Could someone write out the total ionic equation and the net ionic equation for: 2Na3PO4 (aq) + 3CuSO4 • 5H2O (aq) → Cu3 (PO4)2 (s) + 3Na3SO4 (aq) + 15H2O (l) Cu++ + PO4--- >>> Cu3 (PO4)2 (s) Of course, it needs to be balanced.
88. ### Urgent chemistry help

is there anything unusual about how the first elements are named when naming the compound? Is there anything unusual about how the second element is named when naming the compound? Why are the elements in the binary compounds combined in different ratios ( as shown by the ...
89. ### organic chemistry

urgent, please help me...this is about the separation and purification scheme... there is 4 group of mixture: a)benzoic acid, benzoin and 1,4-dibromobenzene b)fluorene, o-toluic acid and 1,4-dibromobenzene c)phenanthrene, methyl 4-aminobenzoate and 1,4-dibromobenzene d)4-...
90. ### CHEMISTRY URGENT!

assume that 13.5g of AL react with HCl according to the following equation, at STP: Al(s) + HCl(aq) ---> AlCl3 + H2(g) Remember to balance the equation first. a. how many moles of Al react? b. how mang moles of H2 are produced? c. how mang liters of H2 at STP are produced? ...
91. ### URGENT CHEMISTRY

1. Write the equilibrium expressions for the following reactions: a) 2 N2O(g) + O2(g)  4 NO(g) b) H2(g) + CO2(g)  H2O(g) + CO(g) c) 4 HCl(g) + O2(g)  2 Cl2(g) + 2 H2O(g) d) 3 H2(g) + N2(g)  2 NH3(g) e) H2(g) + Cl2...
92. ### Not urgent but need answer

when you say subract x from y do you mean : y - x or x - y. Whoever answers, thank you for your time y-x
93. ### Chem II (urgent plz)

Consider a titration of 50.00 mL of 0.1005 M HCl with 0.1012 M NaOH.
94. ### Chem Also Urgent!

How do I determine the number of grams for the following substance: 2.40 mol O2?
95. ### Urgent math help!

What is 66 2/3% of 891? PLEASE show me the steps on how you got the answer to this question...
96. ### URGENT MATH help

(x^2y^6-3)^2 .....PLEASE HELP ME I HAVE NO IDEA HOW TO SOLVE THIS IVE BEEN DOING IT FOR HOURS
97. ### Gr.10 Math!!!! urgent

Factor by Grouping. PLEASE SHOW ME THE STEPS! 1.) 8a^2+12ab-3b^2-2ab 2.) x^2+5x+7x+35
98. ### Pre-Algebra(URGENT)

I need three ordered pairs for the following equation: y= 3 - x/2 Thanks -MC
99. ### science .. urgent

what are some conditions on Earth that make it possible to live and survive?
100. ### Algebra 2 URGENT

Simplify: 2x+5 + 2x-5 ____ ______ 4x raised 10x to the second power