Most popular questions and responses by gaby
  1. Chemistry

    The following reaction is first order, C2H6==> 2CH3. If the rate constant is equal to 5.5 x 10-4 s^-1 at 1000 K, how long will it take for 0.35 mol of C2H6 in a 1.00 L container to decrease to 0.20 mol in the same container? Thank you very much

    asked on March 1, 2010
  2. General chemistry

    A solution of LiCl in water is 18.0 wt% LiCl. What is the mole fraction of LiCl?

    asked on April 30, 2010
  3. chemistry

    Gaseous butane CH3CH22CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 4.07 g of butane is mixed with 9.8 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical

    asked on September 21, 2017
  4. physics

    2. a 755N diver drops from a board 10.0 m above the water's surface. Find the divers speed 5.00 m above the water's surface. then find the diver's speed just before striking the water. 3. if the diver in item 2 leaves the board with an initial upward speed

    asked on December 4, 2008
  5. Math

    The image of an eraser in a magnifying glass is three times the eraser’s actual size and has a width of 14.4 cm. What is the actual width of the eraser in cm? a) 14.4 cm. b) 3 cm. c) 43.2 cm. d) 4.8 cm. is it C? A square has 16-cm sides. What is the

    asked on May 26, 2015
  6. Science ms sue please help

    True or false during dry weather the water level in a small pond drops because of runoff. I think it's true but I'm not sure And in the water cycle water returns to earth as condensation usually in the form of rain or snow. Is that true? And when water

    asked on October 24, 2013
  7. math

    Robbie needs to buy fencing for his square vegetable garden that measures 16 3/4 feet on a side. One side borders the back of the garage. The fencing costs $4 per feet. Estimate how much the fencing will cost. I NEED HELP!!!!!

    asked on December 17, 2012
  8. Chemistry

    The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O(g)==>N2(g)+O(g) . If the activation energy is 250 kJ/mol and the frequency factor is 8.0 x 1011 s-1, what is the rate constant for the first-order reaction at

    asked on March 1, 2010
  9. Math

    Suppose y varies directly with x and y=12 when x=6. Write an equation realting x and y. Please help, do not understand.

    asked on May 20, 2009
  10. chem

    How much heat (in kJ) is required to warm 10.0 g of ice, initially at -13.0 ∘C, to steam at 109.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C. The heat capacity of liquid water is 4.18 J/g⋅∘C. This substance

    asked on January 24, 2016
  11. Math

    Alberto is painting a large triangle on one wall of his bedroom the base of the triangle is 4ft and height is 8ft it takes 0.2 quart of paint to cover 1 square foot

    asked on March 3, 2017
  12. History

    What was the sole reason given by President Bush to invade Iraq? a) To expand the US influence in the Middle East. b) Suspicions that terrorists groups had access to weapons of mass destruction. c) In retaliation to the September 11 attacks. d) None of

    asked on May 29, 2015
  13. trig

    Verify that each equation is an identity. 16. 1+tanx/sinx+cosx =secx ok i have a clue on how to do it. i multiplyed the denominator by sinx-cosx and i also did the top but when i do i get this weird fraction with all these cos and sin and then i get

    asked on November 6, 2008
  14. History

    What events lead to the impeachment of President Clinton? A) None of these answers. B) His involvement in scandal which jeopardized his presidency. C) His refusal to implement social programs domestically. D) The declining economy under his presidency. I

    asked on May 20, 2015
  15. Math

    The ratio of dogs to cats at an animal shelter is 3 to 2. How many dogs are at the shelter if there is a total of 30 animals?

    asked on July 25, 2017
  16. Pre-Calc

    Please help me with this word problem, I can't seem to figure it out. Both Derek and Sam are 5ft 10in tall. Derek looks at a 10ft basketball goal with an angle of elevation of 29 degrees, and Sam looks at the goal with an angle of elevation of 43 degrees.

    asked on August 16, 2012
  17. physics!-concervation of energy equations

    2. a 755N diver drops from a board 10.0 m above the water's surface. Find the divers speed 5.00 m above the water's surface. then find the diver's speed just before striking the water. 3. if the diver in item 2 leaves the board with an initial upward speed

    asked on December 4, 2008
  18. History

    Ultimately, Reagan just like Nixon desired less federal government involvement. True or False I think it's false

    asked on May 21, 2015
  19. math

    a shopkeeper sold a total of 15 boxes of pencils on monday and tuesday. he sold 3 more boxes on monday than on tuesday. there were 12 pencils in each box. how many pencils did he sell on monday?

    asked on October 18, 2013
  20. General chemistry

    Identify the classification of isomers illustrated by [Co(NO2)(NH3)5]2+ and [Co(ONO)(NH3)5]2+. are this linkage isomers?

    asked on May 1, 2010
  21. math

    can you help me find the probability to the question? A spinner like the one shown is ued in a game. Determine the probability of each outcome if the spinner is equally likely to land on each section. Express each probability as a fraction and as a

    asked on December 2, 2008
  22. Chemistry

    Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?

    asked on November 9, 2014
  23. physics

    a baseball is thrown at an angle of 24 degrees relative to the ground at a speed of 23.4m/s. the ball is caught 41.4798m from the thrower. how long is it in the air?

    asked on September 26, 2012
  24. psychology

    I need to know what the independent and dependent variables are based off of this research question: "Do younger people have higher technology dependence scores?" Would the IV be technology dependence score, and the DV is age?

    asked on April 22, 2019
  25. Physics

    a 2.5 kg ball moving at 7.50 m/s is caught by a 70.0 kg man while the man is standing on ice. how fast will the man / ball combination be moving after the ball is caught by the man?

    asked on February 20, 2014
  26. Math

    A ferris wheel has 16 cars spaced equal distances apart. The cars are numbered in order from 1-16. What is the measure of the angle of rotation that will map the position of car 16 onto the position of car 13? A) 22.5 B) 45 C) 67.5 D) 90 I think it's D

    asked on May 18, 2015
  27. Math

    In a shipment of 850 widgets, 32 are found to be defective. At this rate, how many defective widgets could be expected in 22,000 widgets? Round to the nearest whole number.

    asked on April 2, 2019
  28. chemistry

    A radium-226 sample initially contains 0.112mol. How much radium-226 is left in the sample after 6400 years. The half-life of radium-226 is 1600 years.

    asked on May 31, 2011
  29. History

    Last question haha Steve Jobs created competition in the industry of technology in the late 1970s by his creation of the first personal computer. true or false is it true?

    asked on May 21, 2015
  30. Physics

    A quarterback throws a football toward a receiver with an initial speed of 18 m/s, at an angle of 29 degrees above the horizontal. At that instant, the receiver is 19 m from the quarterback. With what constant speed should the receiver run in order to

    asked on November 7, 2011
  31. chem

    A small “coffee cup” calorimeter contains 110. g of H2O at 22.0°C. A 100. g sample of lead is heated to 90.0°C and then placed in the water. The contents of the calorimeter come to a temperature of 23.9°C What is the specific heat of lead?

    asked on August 17, 2010
  32. Math

    Janes aquarium holds goldfish, turtles, and snails. there are 16 legs, 10 shells, and 36 eyes. how many creatures of each type are in the aquarium? (Hint: snails have one leg and one shell) Please please help me. I figured out there are 12 pets(I think)

    asked on December 27, 2009
  33. History

    The United States does not allocate funds to the rebuilding of the region of Afghanistan because of tension between the two countries in the past. True False is it True?

    asked on May 27, 2015
  34. History

    What did Reagan and Nixon have in common about their campaigns? A) Their aggressive push for rights for people with disabilities. B) They both widely appealed to African Americans. C) They both appealed to Americans frustrated with the stance of the

    asked on May 20, 2015
  35. Algebra

    The ratio of the lengths of two pieces of ribbon is 1:3. If 4 ft were cut from each piece, the sum of the new lengths would be 4 ft. How long would each piece be ?

    asked on July 30, 2011
  36. Math (Algebra 2)

    The odds in favor of Carl beating his friend in a round of golf are 7 : 4. Find the probability that Carl will beat his friend. Would I take 7/(7+4)=77 So, 77 would be the correct answer? Thanks!

    asked on March 30, 2017
  37. Mathematics

    True / False: The Plurality-with-Elimination Method sometimes violates (i.e. does not always satisfy) the majority criterion. 1. False because the plurality-with-elimination method always requires the winner to have the majority of votes. 2. True because

    asked on March 29, 2017
  38. Chemistry

    A 2.00 M solution of CaCl2 in water has a density of 1.17 g/mL. What is the mole fraction of CaCl2?

    asked on March 1, 2010
  39. Chemistry 111

    Whatis the gas produced when you add NaHCO3 to methyl salicylate?

    asked on November 14, 2010
  40. math

    Each camper gets a 1/2 cup of juice. For each mux how much concentrate and how much water are needed to make juice for 240 campers. Mix A 2 cups concentrate 3 cups water Mix B 5 cups concentrate 9 cups water Mix C 1 cup concentrate 2 cups water Mix D 3

    asked on November 19, 2008
  41. Math

    Mix A=2 cups concentrate:3 cups water Mix B=5 cups concentrate:9 cups water Mix C=1 cups concentrate:2 cups water Mix D=3 cups concentrate:5 cups water For each mix, how much concentrate and how much water are needed to make 1 cup of juice?

    asked on November 20, 2008
  42. algebra

    There are (3^5)^2 ⋅ 3^0 leaves on a tree. What is the total number of leaves on the tree? 33 37 310 325

    asked on October 7, 2015
  43. science

    if an organism expresses a recessive phenotype can you tell the genotype? Explain your answer by giving an example. i cant understand how or what a good example is. please help thanks

    asked on February 25, 2009
  44. math

    What is the unit rate for... 343.8 mi. on 9 gallons (round to the nearest tenth if necessary)

    asked on December 3, 2008
  45. music

    why does music around the world impact cultures so differently?

    asked on April 22, 2008
  46. physics

    a cat chases a mouse across a 1.6m high table. the mouse steps out of the way and the cat slides off the table and strikes the floor 2.0m from the edge of the table. what was the cat's speed when it slid off the table?

    asked on September 26, 2012
  47. sustainability (wes jackson)

    I need help understanding this article from wes jackson "toward an ignorance based worldview". I understand he does not speak of knowledge as in getting an education of a university, but i cannot understand his point. could anyone please help me.

    asked on November 29, 2010
  48. Global History

    what factors besides enfing the war in the pacific might have contributed to president Harry Truman's decision to drop the atomic bomb?

    asked on March 26, 2010
  49. Chemistry

    Using the following information, identify the strong electrolyte whose general formula is Mx(A)y * zH2O Ignore the effect of interionic attractions in the solution. a. A"-is a common oxyanion. When 30.0 mg of the anhydrous sodium salt containing this

    asked on April 11, 2007
  50. algebra

    If (92)p = 98, what is the value of p? 2 3 4 6

    asked on October 7, 2015
  51. Math Ms Sue ???

    The image of an eraser in a magnifying glass is three times the eraser’s actual size and has a width of 14.4 cm. What is the actual width of the eraser in cm? a) 14.4 cm. b) 3 cm. c) 43.2 cm. d) 4.8 cm. is it C? A square has 16-cm sides. What is the

    asked on May 26, 2015
  52. physics

    When the Sun is directly overhead, a hawk dives toward the ground with a constant velocity of 4.80 m/s at 50.5° below the horizontal. Calculate the speed of her shadow on the level ground. What i have done: x= rcos(theta) x=4.80m/s*cos(309.5) x=3.05m

    asked on September 11, 2014
  53. social studies

    i need help!!!!! one type of lightning bug glows once every 1 1/2 seconds. how many times can it glow in 1 minute? and the other one is : Bea can run 1/6 mile in 2 minutes. how long should it take her to run 2 miles? please help the teacher wont help me

    asked on January 16, 2013
  54. Algebra 1

    The cube root of the volume of a cube gives the length of one side of the cube . Volume:343 cm^3. A:Find the side length of the cube shown . B:Find the area of each face of the cube.

    asked on September 4, 2010
  55. Math

    A=2 cups concentarte:3 cups water B=5 cups concentrate:9 cups water C=1 cup concentrate:2 cups water D=3 cups concentrate:5 cups water For each mix, how many batches are needed to make juice for 240 campers? (each camper gets half a cup of juice)

    asked on November 20, 2008
  56. Calculus

    AM having problems understanding what equations to use for this word problem. Please help. A rectangular storage container with an open top is to have a volume of 48ft^3. The length of its base is twice the width. Material for the base costs $8 per square

    asked on March 11, 2012
  57. Math

    How many ways can 6 people line up for a race. This is is a combination, but I do not know how to solve it. Help is appreciated.

    asked on March 22, 2009
  58. math

    Draw and name a quadrilateral that is equalateral but not equal angular. how can it be equalangular if its equalateral? I cant figure out what the angle measures are.

    asked on February 17, 2009
  59. algebra

    I'm confused. Can you help? "The community pool charges $8.00 for adults and $5.00 for children. The total revenue for a particular cloudy day is $648.00. Determine the number of adults and the number of children who went to the pool that day if twice as

    asked on March 11, 2014
  60. Physics

    A hockey player makes a slap shot on a 2.0 kg stationary puck, exerting a 30N force for .16 seconds. A What impulse is given to the puck? B. With what velocity does the puck leave the stick?

    asked on January 22, 2012
  61. Science

    explain how a zygote could end up with an extra chromosome please help my book does not explain

    asked on February 24, 2009
  62. science

    Lisof a strand of the base sequence of a strand of RNA made using the DNA pattern ATCCGTC. Can you please help me

    asked on February 24, 2009
  63. Math

    If a building 1 begins with four blocks and increases by three blocks each building, how many blocks will it take to make building 1,000

    asked on September 20, 2007
  64. MAth

    What is another way to show 1/8 + 5/8

    asked on January 21, 2016
  65. English

    Which quote from the train car could be interpreted as the foreshadowing by the author? a) "You'll see, you'll find your husband and sons again … In a few days…" b) "Fire! I see a fire! I see a fire!" c) "Keep her quiet! Make that madwoman shut up.

    asked on June 1, 2015
  66. Chemistry

    Volume of HCl, mL:26.5mL Volume of NaOH,mL:29.1mL Molarity of NaOH, mol/L:0.1m/L balanced equation: NaOh+HCl-->NaCl+H2O Using the above equation calculate the number of moles of acid required to react with 2.91 moles of base. Please help me I have no idea

    asked on May 28, 2012
  67. algebra

    You have 24 feet of fence to make a rectangular garden.Each side will measurw a whole number of feet.How many different sized rectangular gardens can you make?

    asked on January 20, 2011
  68. re:social studies

    The Democratic point of view is that the Republicans are the party of "No," and progress will be severely impeded if Republicans gain a majority in Congress. Republicans will extend the tax cuts for everyone, including the rich. why though? The Republican

    asked on September 19, 2010
  69. math

    what is the probability of winning a lottery game where the winning number is made of 6digits from 0-9 chosen at random? i do not undestand how to solve please help

    asked on April 9, 2009
  70. american history

    ok im doing a crossword puzzle on the constitution info...i'm doing 11th grade history and i just need 2 answers left... the 1sr is , powers of both the state and federal governments (but the third letter is s) ..2nd is and anti federalist (during the

    asked on October 5, 2008
  71. History

    The conflict with the Middle East did not start until after the September 11th attack in America, there were no other problems stirring beforehand. True False is it false?

    asked on May 26, 2015
  72. math

    Sean's older brother is 16 years old. He runs between 15 and 25 miles each week. The sum of the digits of the total number of miles that he ran last week is eight less than his age. How many miles did Sean run last week?

    asked on April 22, 2013
  73. chemistry

    N2(g)+3H2(g)2NH3(g) +▲H if uou are preparing NH3, hiw does the following increase the yield of NH3? (a) ▲[N2] ▲[H2] (b) ▲T of the chamber storing NH3 (c) ▲P of the system (d) ▲[NH3(g)] * equilibrium * ▲ change

    asked on February 18, 2013
  74. physics

    a pelican flying a horizontal path drops a fish from a height of 5.0m. the fish travels 8.1m horizontaly before it hits the water below. what was the pelicans initial speed?

    asked on September 26, 2012
  75. Algebra II

    Please help me solve this rational function, my teacher did not give us notes and the book is confusing me :/ Thank You! y/5+y/2=7

    asked on March 12, 2012
  76. math

    if the artist used scale pof 1/2 inch to represent 1 foot , what are the dimensions in feet of the mural?

    asked on January 10, 2012
  77. MATH

    instrctions:graph each linear equation .tell whether it represents a function. 1.) x+y=4 HELP QUICK PLEEZE!!!!!!!!!!!!!!!!!!!!!

    asked on November 1, 2010
  78. Math

    Write an equation in standard form for the line whose slope is undefined that passes through (5,-3) Please help me solve, my answer is 5x-3y=0... It was marked wrong and i can not seem to figure it out.

    asked on November 30, 2009
  79. Science

    What are the types of succession that may occur in the Sahara desert. And what are the effects. I don't know what succession can occur in the sahara desert.

    asked on February 10, 2009
  80. 11th grade

    I need help with substitution math.

    asked on November 3, 2008
  81. Algebra

    Given that g(x) = 4x + 6, find the value of x that makes g(x) = 14.   -50 -5 2 8

    asked on October 30, 2015
  82. geometry

    The height of a triangle is 25 inches greater than its base. The area of the triangle is 625 square inches. The height of the triangle is inches and the base of the triangle is inches.

    asked on September 7, 2015
  83. chemistry

    N2(g)+3H2(g)2NH3(g) +▲H if uou are preparing NH3, hiw does the following increase the yield of NH3? (a) ▲[N2] ▲[H2] (b) ▲T of the chamber storing NH3 (c) ▲P of the system (d) ▲[NH3(g)] * equilibrium * ▲ change

    asked on February 18, 2013
  84. math 4 th grade

    In which total oes the digit 3 represent 3 tenths? a. 12 quarters, 2 dimes, 3 pennies b. 3 quarters, 5 nickles, 3 pennies c. 2 quarters, 3 dimes, 5 pennies d. 2 quarters, 8 dimes, 5 pennies

    asked on January 30, 2013
  85. Social studies

    Compare and contrast how that location of Mesopotamia affected trade and culture.

    asked on November 6, 2012
  86. Math

    What scale factor was used to enlarge the baby( 7 feet ) to the new height of 50 feet?

    asked on October 18, 2012
  87. chemistry

    what volume of water should be added to 300ml of HNO3 0.25M to obtain HNO3 0.2M?

    asked on September 7, 2012
  88. math

    3n+6 If n represents the position of a number in the pattern, which of the following is the pattern of numbers decribed by the expression? f. 1,9,12,15,18 g.6,12,22,36,54 h. 9,12,15,18,21 j. 3,9,12,15,21

    asked on January 30, 2012
  89. geometry

    what can you tell me about the remaining parts of the triangle?

    asked on January 9, 2012
  90. social studies

    what did the kings did for their peole nd what did they get in return

    asked on January 26, 2011
  91. Reading

    For my summer reading project, they require us to state the point of view and to give a quote from the book (the Alchemyst) to prove the book was written in that point of view. The book is omniscient, and almost every chapter it is a different character

    asked on August 2, 2010
  92. english

    I need to add modifiers to this sentence A dog barked and ran.

    asked on April 27, 2010
  93. Math

    5d^3-80d=0 Please help me solve this equation by factoring.

    asked on April 12, 2010
  94. Global History

    How did the location of axis powers in Europe contribute to their defeat?

    asked on March 26, 2010
  95. math

    if a gift is 42.40 including tax,what is the retail price for the gift if the sales tax is 6% ??

    asked on January 6, 2010
  96. Math

    Find 2 solutions to the equation 3x+5y=10. Write the solutions as ordered pairs. This is on my math study guide for our final and she already took up our text books. please help me!

    asked on May 31, 2009
  97. Math

    I am having probles with solving systems of equations by graphing please help!! y=4+2/3x 2x=3y

    asked on May 13, 2009
  98. Science

    I was doing a lab about tropism in plants. I used mustard seeds and they had a positive growth. I do not understand the question... Classify the responses you observed as positive or negative tropisms.

    asked on January 21, 2009
  99. math

    In an illustartion of a honeybee, the length of the bee is 4.8 centimeters. The actual size of the honeybee is 1.2 centimeters. What is the scale of the drawing?

    asked on December 1, 2008
  100. american history

    i'm in a highschool american class and were learning about the constitution time.. who was an antifederalist of this time and what is the name of powers kept by both the state and federal governments

    asked on October 5, 2008


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