chemistry! URGENT

61,546 results, page 20

  1. Chemistry

    Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter.
  2. Urgent Spanish Check

    La clase no es _____. Hay pocos alumnos. Grande? How would you express the following question in English?: ¿Cuántos libros hay? How many books are there? Hay muchos ____ diferentes en una escuela secundaria. cursos ¿Hay una clase de biología hoy? Sí, ______. lo hay There ...
  3. Math IN URGENT NEED OF FEEDBACK

    If the temperature is constant, then the atmospheric pressure P (in pounds/square inch) varies with the altitude above sea level h in accordance with the law given below where p0 is the atmospheric pressure at sea level and k is a constant. P = p0e-kh If the atmospheric ...
  4. Urgent

    Please exlain rate distance and time for me Distance is how far. Time is the clock time it took to move. Rate is the speed you went. distance= rate x time http://mathforum.org/dr.math/faq/faq.distance.html
  5. Socials Studies (URGENT)

    I need to create a children's book of at least 15 pages. I must write about Jacques Cartier, Samuel de Champlain or what life was like in New France. I was going to do Jacques Cartier, but it was too hard. I didn't know how to do it. I've decided to try what life was like in ...
  6. Chemistry

    I'm not doing so well in ap chemistry. i think i'm not studying the right way. can anyone suggest how i can raise my grade? i do my homework but it doesn't seem to help.
  7. Academic 4-year plan: Zoology

    Can you take AP Chemistry without taking any previous chemistry class?
  8. chemistry

    This is another question on my chemistry worksheet. What is a gas's molecular mass? I guess they want the definition because there are no numbers involved.
  9. chemistry .............chemistry

    what color emission would you see if you heated each solution to an extremely high temperature? why
  10. Chemistry

    Why would a firefighter or a reporter need to understand chemistry?
  11. previous chemistry.

    can some one reply to my last chemistry post? thanks.
  12. chemistry

    can you tell me how can i make a chemistry working model for class 9
  13. AP CHEMISTRY

    Someone please answer my question below in AP CHEMISTRY.
  14. Chemistry

    Why is the mole considered an important quality in Chemistry? What does it allow us to do?
  15. CHEMISTRY HELP

    how can analytical chemistry help on different fields of sciences and technology?
  16. CHEMISTRY

    THE DIFFERENT TYPES OF THE FUNCTIONAL GROUP IN ORGANIC CHEMISTRY
  17. Physics. Urgent help need!!

    A baseball player hits a triple and ends up on third base. The baseball "diamond" is a square, each side with length 24.2 m, with home plate and the three bases on the four corners. What is the magnitude of his displacement? * I'm not familiar with the sport i divided the ...
  18. Urgent! Help please!

    On January 5, Ebony Davis borrowed $6,500 on a simple interest loan from a lending institution to finance her catering business. She borrows the money at a rate of 8.5% with a term ending on December 9. a. Calculate Ebony's interest on the simple interest loan if she waits ...
  19. algebra 1,urgent

    the expression (4x^2-3x+1)-(x^3+2x+7) what is the coefficient of the x term in the simplified expression? what is an equation of a line parallel to the line with equation 2 y=14-6x a.y=-6x+18 b.y=-3x-9 c.y=6x+3 d.y=3x+8 Solve linear system, which substitution of unkowns is ...
  20. Urgent History, Check Answers Please

    The first significant trading post was __________. Poste de Arkansea The reputation of the Spanish was diminished after the Battle of __________. The Twin Villages The Twin Villages were located in Montague County, Texas, and __________ County, Oklahoma. Jefferson Which of the...
  21. Math - Need urgent help!

    A residential property is assessed for tax purposes at 40% of its market value. The residential property tax is 3 1/3% of the assessed value and the tax is $1200. a)What is the assessed value of the property? b) What is the market value of the property?
  22. Chemistry

    Who used x-ray diffrection experiments for the periodic table http://www.chemistry.co.nz/henry_moseley.htm
  23. Courses *URGENT*

    I have to complete a course selection form for school but I'm having some trouble understanding some of the courses. Can someone please help me please? Science and Technology: This is a science course provided to meet the needs of students requiring a general science course ...
  24. Chem

    why is an understanding of chemistry important in biology? All digestion, nutrition, muscle usage/reactions, cell division/reproduction, and all of the enzymatic processes at work in the body are chemisty. Even eyesight is a chemical reaction. So you need to know something ...
  25. Biology--Urgent

    Need help with this: 'Social bees survive by collecting nectar or pollen from flowers, pollinating the flower in the process. They must keep their hives at a constant temperature, moisture, and oxygen content for their larvae to develop. One way they do this is by beating ...
  26. MATH

    15. Write a function rule that represents y is 5 less than the product of 4 and x. 16. Write a function rule that represents 7 less than three fifths of b is a. 17. Write a function rule that represents the almond extract a remaining in an 8 oz bottle decrease by 1/6 oz for ...
  27. chemistry

    can you give me examples of pictures just name it, ummm.. CHEMISTRY IN DAILY LIVING , TECHNOLOGY AND SOCIETY
  28. chemistry

    what does SPDF mean in chemistry on the periodic table? What is the PDO format in when writing a lab report? pls help
  29. AP CHEMISTRY

    Could someone please tell me where to find the 2008 AP Chemistry Multiple Choice for FREE ONLINE? Thank You in advance!
  30. grade 12 chemistry

    explain the concept of a “stock solution” and standard solutions as if you were explaining it to a friend who is not studying chemistry.
  31. Chemistry

    I am working on a solid chemistry problem, but I do understand what e^ means. Is it the elementary charge? or Faraday constant. Please help.
  32. Social Studies urgent

    All of these were inspirations for 15th Century European exploration of the Western Hemisphere EXCEPT A) the desire to spread Christianity B) the desire to conquer India and China C) the desire to establish new trade routes to Asia D) to search for basic resources and land ...
  33. math

    You randomly draw letter tiles from a bag containing the letters from the word INDEPENDENT. 1. You randomly draw an N. Then, without replacing the first letter, you pick a D. Tell whether the events are independent or dependent. Then find the probability that both events occur...
  34. Urgent Spanish Check

    A) Read the following sentence and choose which word is not correct in the context of the sentence. 1) La examen es difícil. La? 2) El árbol es verdes. el? B) The following sentence is written in singular form. Read the sentence, then choose the correct plural form. 1) Nicol...
  35. ECON - urgent please help

    demand for sulfur dioxide by coal-fired electricity electricity producers is: Firm A's demand: P= 1,000 - 80 Q Firm b's demand: P= 1,000 - 20 Q where Q is quantity of sulfur dioxide measured in thousands of tons, and P is price per ton of sulfur dioxide. a)With the market cap ...
  36. help!!!Urgent english

    I have a question.If you have employment,are you looking for work? Pleaase answer quicky........It is due on 22/06/05. Sandy You can have employment but still be looking for another job or advancement in the same area. On the other hand, you can be satisfied with your ...
  37. math urgent help needed!!

    I am so sorry but this homework is due in half an hour. Please help me! A smokestack deposits soot on the ground with a concentration inversely proportional to the square of the distance from the stack. With two smokestacks 20 miles apart, the concentration of the combined ...
  38. soial studies-URGENT!!NEED BY 8:25 A.M. TOMORROW!

    Who was an important person in Christianity,islam and judaism, where were they started and when were they discovered? THANX!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :) Type in these different religions in a google search or Wikipedia, find the name of a person that seems important, then...
  39. physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!

    A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 340 m/s. The slope has an angle α= 12 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...
  40. Physics pls anyone can help me? its urgent

    When the sun is in the zenith and the sky is perfectly clear, the solar power we receive on the surface of the earth is roughly 1 kW per square meter (on a horizontal surface that is normal to the direction of the sun). Calculate the average solar power per square meter (in ...
  41. Physics pls anyone can help me? its urgent

    When the sun is in the zenith and the sky is perfectly clear, the solar power we receive on the surface of the earth is roughly 1 kW per square meter (on a horizontal surface that is normal to the direction of the sun). Calculate the average solar power per square meter (in ...
  42. science-this is urgent, plz help me! its easy too.

    we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...
  43. Physics Urgent please help

    A spring of negligible mass, spring constant k = 82 N/m, and natural length l = 1.2 m is hanging vertically. This is shown in the left side where the spring is neither stretched nor compressed. In the central one, a block of mass M = 5 kg is attached to the free end. When ...
  44. social studies

    1. Explain two ways in which sectionalism caused conflict or tension in the United States during the early 1800s. Then explain how sectionalism affects economics and politics in the United States today. 2. which was more of a priority in presindents lincolns reconstruction ...
  45. English

    Can someone please check my answers for this? Thanks! 1. What is the latter tone of "The Morning of June 28, 1949 and 'The Lottery'"? a. offended and angry b. taken aback and sarcastic*** c. surprised and confused 2. Which of the following words is an example of an absolute ...
  46. Accounting urgent

    Foster Glass Company purchased a fax machine on July 1, 2007 for $1,800. The fax machine had an estimated useful life of three years and a salvage value of $300. Assume Foster uses the double-declining balance (DDB) depreciation method. Foster decided to replace its fax ...
  47. MATH - URGENT!!!

    6 people are sitting around a table. Let x be the number of people sitting next to at least one woman and y be the number of people sitting next to at least one man. How many possible values of the ordered pair (x,y) are there? (For example, (6,0) is the pair if all 6 people ...
  48. physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!

    A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 210 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-round). The poles near ...
  49. Chemistry

    Tell me a website from where i can get full information regarding IUPAC nomenclature of organic chemistry. It's rules, inforamtion everything.
  50. chemistry help

    Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.
  51. chemistry

    Im brenda,n i found its hard copng in chemistry.im dng grd 11,n i wish 2 hv sm1 wo wil help m cope.tnx
  52. chemistry

    Hi I am in AP Chemistry and I did not take regulars chem so I have never done labs before and was wondering If anyone could give me examples on how to do a lab
  53. Chemistry

    For my Chemistry question it's about herbicide's What do they do? what are they intended for? what risk's do they pose in our society? how are they created? if anyone could answer these please thanks you!
  54. Chemistry

    describe how you would prepare 250.0 mL of a .500 M solution of NaCl by using apparatus found in a chemistry lab.
  55. Chemistry! HELP

    A chemistry student used the symbol "sx" to represent an s orbital that lies along the x-axis. Is this reasonable. Justify your answer.
  56. Chemistry

    What is the chemistry behind the ASA – FeCl3 reaction?
  57. Chemistry

    What is the chemistry behind the ASA – FeCl3 reaction?
  58. chemistry

    how do you add ph values of neutrals and bases in chemistry?
  59. Chemistry --- chemistry ---

    what is the difference between an atom and an ion ???
  60. chemistry .....chemistry

    what element include in the fireworks power ? why
  61. chemistry

    What is an open and closed sytem refer to in chemistry? thanks!
  62. ap chemistry

    WHERE CAN I TAKE AP CHEMISTRY ONLINE DIAGNOSTIC TEST?
  63. help...urgent..calculus

    Sony Ent. is marketing a new smartphone. It determines that in order to sell x smartphones, the price per product must be p=280-0.4x. It also determine that the total cost of producing x smartphones is given by c(x)=5000+0.6x^2 . a. Find the total revenue, R(x). b. Find the ...
  64. Physics (urgent please)

    Two parallel wires are carrying 5A and are separated by 2.0 m. if the currents are in opposite directions, what is the magnitude of the magnetic field halfway between them? Someone please help as I can't figure out the question. Thanks, They are asking for the field between ...
  65. URGENT! Physics

    A boy shoves his stuffed toy zebra down a friction-less chute, starting at a height of 1.07 m above the bottom of the chute and with an initial speed of 1.87 m/s. The toy animal emerges horizontally from the bottom of the chute and continues sliding along a horizontal surface ...
  66. MATH URGENT!!!!

    An investigator was interested in studying the effect of taking a course in child development on attitudes toward childrearing. At the end of the semester, the researcher distributed a questionnaire to students who had taken the child development course. Questionnaires were ...
  67. Biology - URGENT Enzyme Lab

    Did a catalase producing hydrogen peroxide lab, used manganese dioxide, fresh frozen liver, potato, ice, fine clean sand, etc. Basically just added hydrogen peroxide to the catalysts under diff conditions and stuff. Just don't get this question which is : how do you account ...
  68. help...urgent..calculus..please show tthe way to s

    Sony Ent. is marketing a new smartphone. It determines that in order to sell x smartphones, the price per product must be p=280-0.4x. It also determine that the total cost of producing x smartphones is given by c(x)=5000+0.6x^2 . a. Find the total revenue, R(x). b. Find the ...
  69. FRENCH! HELP!

    so i have this french test tomorrow on imparitive, and subjonctif. i have had a lot of trouble remembering them, and telling them apart. can anyone help!? that would be fantastic! thank you so much! its urgent! Imperative (note spelling) means giving a command or an order. The...
  70. English

    These are the very last sentences. I really hope you can check them. It is really urgent. Thank you in advance. 1) Bitzer embodies the word of facts, in which Mr. Gradgrind believes. Society was regarded as an evil force, which prevented men from behaving naturally. 2) As for ...
  71. English

    I forgot to include the following sentences. They are really urgent. 1)He hadn't read a book since he was a boy/ "by the time he was a boy he hadn't read a book (is a mistake?) 2) She told me she had dumped him/broken/finished with him. (are they all possible???) 3) “Lots of...
  72. Chemistry

    Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemistry Thanks:-) Duplicate post.
  73. Y9 chemistry

    I need to answer a few questions fo my chemistry homework- 1.Why does the mass of copper sulphate decrease as a result of being heated?
  74. Chemistry

    Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
  75. Chemistry

    Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
  76. Chemistry

    Does anyone know a website with practice problems (and answers) regarding quantitative chemistry? I haven't been able to find anything on Google.
  77. MATH urgent!!!

    My problem: From 1992 to 1996, the annual income for all the private golf courses in the United States can be approximated by the model: I=59t^2+2254, where I is the annual income in millions of dollars and t is the year, with t=0 corresponding to 1990. 1. In which year did ...
  78. Physics - URGENT

    Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.70 ✕ 105 Pa and the pipe radius is 2.50 cm. At the higher point located at y = 2.50 m, the pressure is 1.21 ✕ 105 Pa and the pipe radius ...
  79. Law - please help... urgent

    in as law if there is a question on alternative dispute resolution do i decribe negotiation mediation conciliation mini trials AND arbitration or just the first four? It depends on the alternative dispute contract that was agreed on by the parties. It can be any of the above, ...
  80. urgent chem help ( dr bob plz)

    A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.50? ============================ first i did was ph = 11.50 PH= 14-11.50 = 2.5 10^-2.5 = 0...
  81. Urgent due tomorrow Algebra

    Tom, Dick, and Harry are three brothers and have $107.60 together. Tom feels sorry for hairy because he has less money than Tom. So Tom gives harry $2.10 so they both will have the same amount after the transfer. Dick doesn't know about Tom's gift and he gives $1 to Harry. So ...
  82. physics(HELP IT'S URGENT)

    A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
  83. PHYSICS URGENT HELP

    A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
  84. English

    Can someone check my post? It's urgent. Thank you very much in advance! I like the urban look the most/the worst because it is so cool. These clothes are baggy and comfortable enough to wear anywhere/for work/for school/at parties/to go out. I like to wear casual clothes like ...
  85. Test tomm. Need help *Urgent*

    Sorry for posting so many topics, but I really need help on this stuff. I recently lost my work I did on a separate sheet from 2 weeks ago, and now I can't seem to find the answer again. a fair six-sided die is tossed seven times in a row. A) What is the probability that a "4...
  86. Calculus (urgent help)

    consider the function f that is continuous on the interval [-5,5] and for which the definite integral 0(bottom of integral sign) to 5(top of integral sign) of f(x)dx=4. Use the properties of the definite integral to evaluate each integral: (a) definite integral from 0(on the ...
  87. chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  88. Chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  89. chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  90. Chemistry

    I need to know how chemistry relates to sepsis (an infection where anitgens invade the red blood cells i think) I cant find any web sites to help me
  91. chemistry

    so all i do is add 273.15 to the temperature in celsius( sorry about the typo. i no i spelled chemistry wrong too)and then multiply/divide everything?
  92. Chemistry

    What is the highest number of bonds that one Carbon atom can make? 4 3 2 1 I'm thinking four but I probably am wrong-I'm not great at chemistry but I'm trying Thank you
  93. chemistry

    What is the chemistry behind the “Breathalyzer” test. I'm supposed to explain the chemicals and structures involved with the reactions which produce the positive and negative results
  94. CHemistry

    For the reaction 2 Na + 2 H2O -------> 2 NaOH + H2, how many grams of hydrogen gas are produced when 133.6 g of water are reacted? I am soooo confused in chemistry. Please help.
  95. help-grammar

    can someone correct these sentences...it is urgent!thanx how much targets had company identified? why does M&A haveing slow progress? I am not sure what you are trying to say; however, I have tried to make these make sense. How many targets had the company identified? Why is M...
  96. Calculus (urgent!!)

    A particle moves with its position given by x=cos(2t) and y=sin(t), where positions are given in feet from the origin and time t is in seconds. A)Find the speed of the particle. Speed = ____________ (include units) B)Find the first positive time when the particle comes to a ...
  97. Accounting urgent

    Prepare the journal entries to record the following transactions on Panther Company’s books using a perpetual inventory system. (For multiple debit/credit entries, list accounts in order of magnitude.) (a) On March 2 Panther Company sold $853,700 of merchandise to Eagle ...
  98. English

    The sentence "Like a boil that can never be cured as long as it is covered up but must be opened with all its pus-flowing ugliness to the natural medicines of air and light, injustice must likewise be exposed" communicates a(n) __________ tone. A. Urgent B. Matter of fact C. ...
  99. math(urgent)

    During a Merdeka Day celebration,a furniture company marked down the price of a queen size bed by 25%,selling it for $1200. At this reduced selling price,they made a markup of 10% on the selling price. a) find the regular price of bed before marked down. b) find the cost of ...
  100. Calculus - HELP URGENT PLEASE

    Consider a lake of constant volume 12200 km^3, which at time t contains an amount y(t) tons of pollutant evenly distributed throughout the lake with a concentration y(t)/12200 tons/km^3. assume that fresh water enters the lake at a rate of 67.1 km^3/yr, and that water leaves ...
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