# chemistry! URGENT

61,843 results, page 7
1. ## urgent urgent algebra / precalculas

lcohol and Driving The concentration of alcohol in a person’s bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by the equation R = e kx where x is the percent of concentration of alcohol
2. ## Chemistry URGENT

I am having a hard time understanding how to calculate pH. my textbook states that that pH =-log[H^+]. I have two questions that asks: What is the H^+ concentration in an acid with of pH 4.6? Express your answer as a power of 10. What is the H^+
3. ## chemistry URGENT (2)

Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system ("on" or "by")? Note that no "en-on" cases appear here, as these are always thermodynamically unfavourable.
4. ## Chemistry (URGENT)

Balance the following equations. 3. C12H22O11 + O2 = CO2 + H2O Answer: C12H22O11 + 12 O2 = 12 CO2 + 11 H2O 8. CH3OH + O2 = CO2 + H2O Answer: 2 CH3OH + 3 O2 = 2 CO2 + 4 H2O I balanced all the others just fine. But I seem to be having trouble with these two.
5. ## Urgent Chemistry!!

I have done everything to solve this problem and I can't get the right answer (153.8J/degrees C). Ammonium nitrate, a component of fertilizer, decomposes: NH4NO3(s) > N2O(g) + 2H2) (g) the delta H=-36.0kJ/mol. 7.65g of ammonium nitrate was allowed to
6. ## urgent urgent algebra / precalculas

Alcohol and Driving The concentration of alcohol in a person’s bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by the equation R = e kx where x is the percent of concentration of
7. ## History URGENT reflecting

Hi What is a general way to reflect on an cartoon? I have some rough ideas like talking about perspective of the artist and the portrayal but I'm not sure if i'm missing something. Thanks!
8. ## math (Urgent)

What is the angle (in standard position - i.e. measured counterclockwise from the positive x-axis) formed by a line from the origin to point (1,-2)? Please help and Thank you
9. ## Math~Reiny Could you help with this question?

List three different ways to write 5^11 as the product of two powers. Explain why all three of your expressions are equal to 5^11. Plz help it's urgent.

Give an example of projectile motion;include in your explantion the term "velocity" , "accleration" and "displacement", orginality in your example will be appreciated?
11. ## english

When you had a car accident last month,a friend offered to help while you were recovering at home.write informal letter and thank her for her kindness!please its urgent
12. ## Calculus Need of Urgent Assistance

Let f(x) = x3 − 7x2. Find the point(s) on the graph of f where the tangent line is horizontal. (x, y) = I already got the smaller value, but I'm not getting the larger value right

Calculate the lengths of the straight lines joining the following pairs of points, leaving your answers in surd form: (a) A(1,-5), B(6,10); (b) A(4,-3), B(7,6).
14. ## urgent maths help needed now

jafar has an isosceles triangle with an area of 20.25cm squared, what is the length of the side facing the right angle?
15. ## bio

Would you agree that it is valuable for a nation to have a citizenry that is reasonably well versed in science? Give reasons for your answer. Would you say this need has become especially urgent in the last two decades? Why or why not? Evaluate
16. ## American Government

PLEASE HELP URGENT How has the power of congress evolved through the Necessary and Proper Clause? What role did McCulloch v. Maryland play in this evolution?
17. ## 8th grade Pre Algebra

Seriously stuck on this: "Find the LCM of n^3 × t^2 and n × t^4?" 1) n^4 × t^6 2) n^3 × t^6 3) n^3 × t^4 4) n × t^2 Can anyone help? URGENT! NEED THIS ANSWERED ASAP!! :( Thanks for your assistance in advance, NatR
18. ## english

When you had a car accident last month,a friend offered to help while you were recovering at home.write informal letter and thank her for her kindness!please its urgent

Use differentiation to find the taylor series about 0 for the function g(x)=(1/16+x)^-5/4 giving all terms up to one in x^2, and calculating each coefficient as an integer or a fraction
20. ## Science (urgent)

Hi I really need to know this I've asked a couple times but haven't gotten an answer yet. In the reaction X + Y ® Z, Z is the A) substrate. B) product. C) enzyme. D) carbon molecule.
21. ## URGENT SCIENCE

1. You travel 400km in 4 hours. Your______ speed is 100km/h. (1point) constant average*** instantaneous initial am i right?
22. ## Math / Pre-Algebra

Seriously stuck on this: "Find the LCM of n^3 × t^2 and n × t^4?" 1) n^4 × t^6 2) n^3 × t^6 3) n^3 × t^4 4) n × t^2 Can anyone help? URGENT! NEED THIS ANSWERED TODAY! ASAP!! :( Thanks for your assistance in advance, NatR
23. ## Urgent Chem Help

A certain substance has a heat of vaporization of 55.30 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.50 times higher than it was at 361 K?

I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?
25. ## Chemistry Urgent

95.0mL of H2O is initially at room temperature (22.0∘C ). A chilled steel rod at 2.0∘C is placed in the water. If the final temperature of the system is 21.3∘C , what is the mass of the steel bar? Specific heat of water = 4.18
26. ## Chemistry Science Project

I need some ideas for high school science projects. It doesnt really matter what field of science, but i would prefer chemistry, biology, or physics. Really Urgent! Thanks! What about a project on osmotic pressure. Put a salt solution inside a thistle
27. ## SUPER URGENT-- CHEMISTRY

1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how much carbon
28. ## CHEMISTRY- urgent

Using the tables of enthalpies of formation and entropies of formation, estimate the boiling point for the following liquid: methanol (CH3OH), ethanol (C2H5OH) and acetic acid (CH3COOH). compare to their tabled boiling points. how would i go about working
29. ## Chemistry

Please!!! its extremely urgent. i do not need answers, only how to do it A sample of nitrogen gas (N2) kept in a container of volume 10.1 L and at a temperature of 20.3°C exerts a pressure of 3.1 atm. Calculate the number of grams of gas present. Round to

What is the real birthdate of Kalpana chawla ,the first indian,asian woman astronaut who died over texas skies on february 1 st 2003?
31. ## Algebra (urgent!)

Write the equations of four lines that intersect to form a square whose sides are not parallel to the axes. Where would I start, and how would I complete this? Thank you so much in advance!
32. ## English

Can you check this sentence, it's really urgent. Before sending you details of my credit card, I would like you to confirm the offer made to me by Mr Smith, your Reservation Executive.
33. ## Socials Studies Project (URGENT)

Researching the Northwest Coast people. I need help with finding info on agriculture, nomadic, hunters, fishers. Thank you very much!!
34. ## Urgent math

Please help me solve this problem?!?! Find the first six terms and the sixth partial sum of the sequence whose nth term is an = 5n2 − n. a1 = a2 = a3 = a4 = a5 = a6 = S6 =
35. ## physics (urgent)

A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?
36. ## Science urgent

A.) Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl- b.) Write the chemical formula name for the compound that would be formed
37. ## Biology: URGENT

Can someone please explain the role of NAHD and FADH2 in cellular respiration, I don't understand, no matter how many diagrams/explanations I read. Thanks!
38. ## Maths Lit, Geography, Consumer Studies, Tourism

I was doing these subject at school so I was wondering which courses I should take in university and what are the available carreer options. Please help, it's urgent
39. ## Urgent Physics!

A top starting from rest is spun for 3 seconds achieving an angular speed of 20 rad/s. How many radians has it gone through in this time? (a is constant)
40. ## history (urgent)

Identify and discuss 4 key actions taken by the U.S. Government between 1790 to 1820 that established long term policy in the U.S. Please help me answer this, thank you so much.
41. ## Math - Urgent!!!

Write the equation of the hyperbola for which the length of the transverse axis is 6 units long anf the foci are at (0,5) and (0,-5). Someone please help me with this question. Thanks in advance.
42. ## ALGEBRA 2 urgent!!

if you have 200 feet of fencing to enclose four adjacent rectangular enclosures. Determine what demensions should be used so that the enclosed area will be maximized.
43. ## Math urgent

I'm having trouble with my practice in connexus, can someone review with me how to find the value of x in a polygon. If I don't respond right away give me a one minute I have crappy wifi XD
44. ## MATHS GEOMETRY!!! URGENT PLEASE.

A triangle has side lengths 10,17 and 21cm. Find the length of the shortest altitude. And please show working out to help me understand.
45. ## Urinalysis: URGENT DUE TOMORROW

If the process of ion attraction within the nephron is not functioning properly what would you expect to find in the blood and urine?
46. ## Chemistry

URGENT!!!!! 4 questions total! 1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of
47. ## Chemistry - please this is urgent

To a calorimeter containing 41.80g of water at 29.95oC, 11.7999 of a salt was added with stirring. As the salt dissolved, the temperature rapidly changed to 37.85oC before slowly returning to room temperature. 1. Calculate the Heat of Solution. Given that
48. ## Urgent Chem Help someone plz

Calculate the mole fraction of the solute in the following aqueous solutions 3.25% ethanol, by volume (d= 0.993 g/ml ; pure C2H5OH, d= 0.789 g/ml )
49. ## urgent mc biology

Which of the following do you have less of at the end of cellular respiration than at the beginning? (a)Co-enzyme A (b)ATP synthase (c)ADP (d)the proteins of the electron transport chain (e)FADH2
50. ## math

Sohini bought 400 eggs at Rs 8.40 a dozen. At what price per hundred must she sell them so as to earn a profit of 15 percent? Give me the solution of it. Urgent**
51. ## English I Speech

Can anyone please share their idea of a strong, powerful hook, background information and thesis about fracking? Please this urgent. Be quick like your life depends on it.
52. ## URGENT language arts question~!

Which of the following compound words is spelled incorrectly? (1 point) afternoon teamate masterpiece earring My Answer: 1)B Is this correct? .
53. ## Calculus urgent help

evaluate the limit as x approaches infinity for the absolute value of (the square root of xsquared+x) -x i think the answer is 1/2 from my calculator but I have to show how i got it algebricallly and have no clue what to do
54. ## Language Arts urgent!!

A student is writing a paper and needs to make sure she is using the word apprehension correctly. What reference book would help her check its part of speech?
55. ## History URGENT!

Young civil rights activists attempted to desegregate Southern restaurants by holding A) Protest B) Sit-ins C) Boycotts
56. ## URGENT CHEM

Write a balanced equation for the following reduction-oxidation reaction. SO3(2-) + MnO4(-) --- SO4(2–) + Mn(2+) numbers in parenthesis means the charge
57. ## Chemistry URGENT

I have to match the items to the statements below, and I'm stuck! My answers are in parentheses, but I know that some of them are wrong. Please help if you know how...I would GREATLY appreciate it! A Dilute B Unsaturated C Saturated D Supersaturated 1.
58. ## English help urgent

Why are the outsides of the buildings in Philbert Place so darkened ? London weather is foggy. <<my choice They were once attractive. They are stained with soot. The area is too crowded.
59. ## Multiculturalism (URGENT)

Identify TEN different cultural traditions, customs, foods, clothing that are part of Canadean lifestyle: 1. Pizza 2. Spaghetti 3. Soccer 4. ? I can only think of 3. Can someone help me think of 7 more? Help appreciated. Thanks.

The mid-point of the straight line joining A(4,-3), B(6,-2) is located at C. (a) Calculate the coordinates of C. (b) Verify your result by calculating the distances AC and BC and showing they are equal.
61. ## History

Hi I'm evaluationg sources and I need help finding out more informatoin on Z.A.B Zeman. IN the book, he said something about being a marxist/socialist/communist but i'm not sure what and its kinda urgent that I find out... I've been working real hard.
62. ## Physics urgent pleasw

Stone is thrown vertically downward with an inital speed of 2.0m/s from height of 10m, determine time it takes to reach the bottom. Thanks!
63. ## TO DrBob222 or any science helper

identify the following formulas as acids, bases or salts: HCH3COO NaCL H2CO3 C6H8)7 Mg(OH) NaOH KBr Sr(OH)2 HNO3 please help really urgent :) thanks :)
64. ## Spanish (URGENT)

I'm learning about the irregular verbs "Conocer" and "Saber" The teacher told us how to differentiate between the two and when to use which. But I still find it very difficult to know when to use which one. Can anyone help? Are there any tricks or tips
65. ## math URGENT HELPPPP!

Regular triangular pyramid has the slant height k=12 cm and lateral area AL = 198 cm2. Find the length of the base edge.

Please Help, The last question has to be done by midnight. A chevy Bel Air, a classic car today, cost \$2,400.0 new in mid-1963. How much would that be in 2012 dollar.
67. ## Biology- Urgent

1. There is no ____ that is specified by a stop codon on an mRNA molecule. 2. Why is it impostant for RNA polymerase to start at the right place and transcribe in the right direction? I really had no ideas on these two. Please help. Any help is

I NEED URGENT HELP!! Bob is riding his bike along at 2m/s and drops his 2kg backpack from a height of 1.5 meters. What is the backpacks resulting velocity when it strikes the ground?

Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?

1)Complete the identity sec Q - 1/sec Q Does this equal -2tan^2Q?
71. ## CALCULUS-URGENT

find the radius and interval of convergence for the series the series from n=0 to infinity of ((-1)^n*x^n)/(n+1)
72. ## World Geography URGENT!

What are the physical landmarks and the physical land features of Switzerland?
73. ## Maths urgent

Solve.√(2)sec(x)+tan(x)=1 0≤x≤360
74. ## math urgent

Find the result if the sumn of the roots of y= x^2+3x-5 is added to the product of the roots.

the question is below: explain the role of sedimentary rocks in the rocks cycle?

What are some examples of two sets of related data with 10-25 data points each?
77. ## URGENT! Calc

If vector |a| = 12 cm, |b| = 13 cm, and the angle between them when placed tail to tail is 35°, find a • b to the nearest centimetre a) a • b = 57 b) a • b = 8 c) a • b = 11 d) a • b = 24
78. ## Urgent Math

Please solve it in step by step. integrate: ∫(cot2x-csc2x)^2 dx

What are some examples of two sets of related data with 10-25 data points each?
80. ## Math- urgent

If slope= 4;(3,8) what would be the equation in point-slope form? Please show your work.
81. ## GEOMETRY - URGENT! HELP!

Let ABCD be a parallelogram. Let M be the midpoint of AB and N be the midpoint of AD. Diagonal BD intersects CM and CN at P and Q respectively find PC/BD.
82. ## GEOMETRY BETWEENNESS URGENT !!

POINTS H, I , AND J ARE THREE POINTS ON A LINE WITH COORDINATES -4/5, -1/SQRT5 AND -1/10. WHICH POINT IS BETWEEN THE OTHER TWO ?

84. ## Trig Help (URGENT)

Solve over the indicated interval: 2sin^2x=sqrt2sinx , [-180,180) don't how to get x by itself please help and thank you
85. ## Precalculus(URGENT)

compute the discriminant of the equation.What does the discriminant indicate about the kinds of solution? 7xsquared=2x-5
86. ## Math urgent

What is 4.1 repeating written as a fraction? I don't know if it should be written over 100 or over 10.
87. ## maths- urgent

The median of the following incomplete frequency distribution is 10: x= 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 f= 0 , 2 , 5 , 6, 3 , 1 , 2 , Y Calculate the frequency of 8
88. ## MATH-IN URGENT NEED OF HELP!

About sequences.... (i) 32, 25,18,11,4 ____(Answer?) (ii)1,3,6,10,15 ____ (iii) 1,3,9,27,81 (iv)64,16,4,1,1/4(this is NOT a typo!)
89. ## Math (URGENT)

Find the slop of the tangent to the curve y=(10-sqrt x)(5+sqrt x) at x=25
91. ## math VERY URGENT+IMPORTANT

What is the area of a shape that that has 8 sides and has 1 , 1 , 8 , 1 , 1 , 3 , 3 and 10 as the lengths of the 8 sides?
92. ## maths- urgent

The median of the following incomplete frequency distribution is 10: x= 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 f= 0 , 2 , 5 , 6, 3 , 1 , 2 , Y Calculate the frequency of 8

What are some of the factors that can lower the risk in starting up a business?
94. ## Trig

URGENT, Please answer this question: give the value of: Tan(Arctan x+1/x-1+Arctan x-1/x)
95. ## Very Urgent Help Here (Math)

Please solve it step by step. Integrate: ∫(x^2/(√(x^2+1))dx
96. ## translation

Can somebody help me find a site for a FREE English-Cebuano translation??? Urgent please!!!
97. ## Math- urgent

What is (6.91 x 10-2 power) + (2.4 x 10-3 power) ? Express your answer in scientific notation.
98. ## Math - Factorising

Find the quotient and the remainder in the following. a). x^4 + 3x^3 + 5x^2 - 6x - 8 is divided by x + 2 b). 2x^4 - 3x^3 + 6x^2 - 5x - 4 is divided by 2x - 3 Please help, this is urgent. Thanks.
99. ## MATH URGENT

The prime factorization of 243 is 3*3*3*3*3. Write 243 as the product of two powers of 3 in as many ways as possible. Thank you