1. chem. Combined Gas laws

A gas takes up a volume of 17 liters, has a pressure of 2.3 atm, and a temperature of 299K. If I raise the temperature to 350K and lower the pressure to 1.5 atm, what is the new volume of the gas? Use the combined gas law here. I will be happy to critique

2. Math

If 4X + Y =H, Then X is equal to? 4X + Y =H Move Y to other side by subtracting Y from both sides. 4X + Y - Y = H - Y Combine terms. 4X = H - Y Now divide both sides by 4 to get 1X. 4X/4 = (H - Y)/4 X = (H-Y)4 or (1/4)(H-Y)

3. Math

A nursery sells Kentucky Blue Grass seed for \$5.75 per pound and Tall Fescue seed for\$4.50 per pound. The nursery sells a mixture of the two kinds of seed for\$5.25 per pound. Let k represent the amount of Kentucky Blue Grass seed the nursery uses in 5

4. Maths-Vectors Help!

Please help confirm if I got this problem correctly; 1)2jx(3i-4k) sol>> 2x3jxi - 2x4jxk = 6jxi - 8jxk = 6k - 8i 2) (i-2j)xk Solutn>> ixk - 2jxk = -j - 2i 3) (2i-4k)x(ix2j) solutn>>2ixi Please do help with this ONE yes, correct. On the third, break recheck

5. Math.

Ashanti and Maria went to the store to buy snacks for their back to school party. They bought bags of chips, ptetzels, and nachos. They bought three times as many bags of pretzels as bags of chips, and two fewer bags of nachos than bags of pretzels. If x

6. science-urgent(plz help)!!!!

a hockey stick has a mechanical advantage of 4. if the effort arm(which is the distance between the fulcrum and your pushing hand-effort)is 25cm long, how long is the stick? if your hand is pushing at a speed of 20km/h, how fast will the puck move?

7. language arts

What are stressed and unstressed syllables? ie, where is the word "dozen" stressed at? This site has a good explanation of stressed syllables. (Broken Link Removed) After reading it, ask youself "how many syllables does 'dozen' have". If you can not tell

8. chem

The equilibrium constant Kc equals 5.90 for the reaction CH3COOH + C2H5OH CH3COOC2H5 + H2O Find the molar concentrations of acetic acid, ethanol, ethyl acetate, and water at equilibrium when .10 M acetic acid and .20 M ethanol are allowed to equilibrate. I

9. chem

can someone plz help me with this? What mass of sucrose (C12H22O11) must be dissolved to make 460 mL of a 1.10M solution? thanks concentration= molessolute/volume moles solute=conc*volume massSolute/molmassSolute=conc*volume

10. Social Studies

What were the Mummy-shaped figures that worked in the afterlife's fields for the mummy. amerald

11. Hydromaint, Inc businees activity model

does anyone out there have the password for solution #18 for the year 6 tax return or for requirement #21 for the year 7 financial stmts?

12. Science

What is special about characteristics properties of matter? A. The state of matter is the same B. The atoms rearrange C. They do not change D. All the properties change I don't understand the ?

13. Math

A nursery sells Kentucky Blue Grass seed for \$5.75 per pound and Tall Fescue seed for\$4.50 per pound. The nursery sells a mixture of the two kinds of seed for\$5.25 per pound. Let k represent the amount of Kentucky Blue Grass seed the nursery uses in 5

14. Math

What property is illustrated by the equation -8+0=-8? a) distributive b) additive inverse c) communitative d) additive identity additive identity is what?

What is special about characteristics properties of matter? A. The state of matter is the same B. The atoms rearrange C. They do not change D. All the properties change This question needs a science tutor's response. I don't understand the question. Did

16. Chemistry

I posted this question on Thursday April 12 and received some help..but need more.. thanks Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass

17. Physics

A large disk of mass M and radius R is spinning like a CD of merry-go-round - that is, about an axis perpendicular to the plane of the disk. It is rotating at an angular velocity ? (initial). At some instant, a sphere of mass M/4 , which is initially not

18. Maths-Vectors Assistance PLZZ!

Prove that the vectors u=3i+j-2k , v= -i+3j=4k, and w=4i-2j-6k can form the sides of a triangle They will form a triangle if they are linearly dependent, that is, if (3,1,-2)= m(-1,3,4) + n(4,-2,-6) from which we get 3 equations in two unknowns. -m + 4n =

19. Chemistry II

A solution of ethanol in water is prepared by dissolving 61.0 mL of ethanol (density = 0.79g/mL) in enough water to make 280.0 mL of solution. What is the molarity of the ethanol in this solution? definition of molarity = #mols/L. mass ethanol = m = volume

20. science

Compare the light gathering power of a telescope with a 10-centimeter(about 4-inch) diameter mirror to that of the human eye. (Take a diameter of the pupil of the eye to be about 5 millimeters)

21. astronomy

Earths temperature averaged over the year is about 300 Kelvin. At what wavelength does it radiate most strongly? What part of the electromagnetic spectrum does this wavelength lie in? Can you see it?

22. Chemistry

The activity series is : Potassium Soduim Calcium Magnesuim Aluminiuim Zinc Iron Lead Copper Silver Gold Am I right ? During a thunderstorm, you see lightning before you hear thunder because, a-.the thunder occurs after the lightning b-.the thunder is

23. Science

Which mixture will separate quickly when left uncovered out in the open? A. Air B. Cola C. Concrete D. Seawater Cola in the open loses its dissolved carbon dioxide.

24. astronomy

How can you tell what sort of gas is emitting light? light is emitted by molecules...each molecule has a definite and unique signature.

25. science

Put a pencil straight down into a glass of water. Notice whether the pencil looks bent. Now tilt the pencil and note how its apparent bending changes. How does this illustrate why light from objects near the horizon is refracted more strongly? Is the

26. UNSCRAMBLE 33 letters to make 9 words

aamaesneadsiainnacedgthteohkhmecy * it's 9 words long * it has to do with sports * it rhymes those are my clues....please help.. Thank you for using the Jiskha Homework Help Forum. Sorry, but I went as far as I could the other day! Good luck! i'm not just

27. Home Economics

Q: How did conflict over the First and Second Banks of the United Sates reflect Federalist and Antifederalist views of government? Federalist view http://en.wikipedia.org/wiki/Federalist_Party_(United_States)

28. chemistry

Do any of you think that spontaneous combustion is possible? If a reaction brings about an increase of entropy (increase in randomness) and also exodermic, then a reaction is spontaneous. Right? Yes, I think spontaneous combustion is possible. It happens.

29. Physics - Science

Imagine a hollow sphere of radius R and mass M. It is welded to the end of a solid rod of length L, whose mass is also M. The rod is attached to the sphere in such a way that the whole assembly, when viewed from the side, looks like a lollipop. (That is,

30. Algebra

In each of the following statements fill in the blanks with always sometimes or never. 1. If the ordered pair (x,y) is not a solution to an equation in two variables, then the point (x,y)is on the graph ______________. 2. The graph of a horizontal line

31. 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

32. science

what is the reaction equation when maleic anhydride is combines with granular zinc and HCl propose structures for the products you would obtain by treating fumaric acid, cinnamic acid, and butynedioic acid with zinc and HCl. write balanced equations for

33. Science

Which is a characteristic of the ingredients of mixture? A. They are chemically joined B. They are able to be separated C. The are mixed evenly D. The will dissolve in water b. they are able to be separated

34. Math

A nursery sells Kentucky Blue Grass seed for \$5.75 per pound and Tall Fescue seed for\$4.50 per pound. The nursery sells a mixture of the two kinds of seed for\$5.25 per pound. Let k represent the amount of Kentucky Blue Grass seed the nursery uses in 5

35. Math

Expand each logarithm. log 7(3x-2)^2 log(3xyz)^2 Thanks in advance. One. log7(3x-2)^2= log7 + 2 log (3x-2)

36. astronomy

Earths temperature averaged over the year is about 300 Kelvin. At what wavelength does it radiate most strongly? What part of the electromagnetic spectrum does this wavelength lie in? Can you see it? ( you answered my question but it doesnt go under 3000K

37. Chem

Consider the reaction H2S(g) H2(g) + 1/2S2(g) At 1065*C the partial pressure at equilibrium of hydrogen sulfied, hydrogen and sulfur are found to be .670 atm, .221 atm, and .110 atm, respectively. Find Kp and delta-G* for the reaction. Find delta-G for the

38. English

How can readers distinguish between prejudicial and non-prejudicial use of rhetorical devices? Here's a previous answer to this question. Posted by Ms. Sue on Tuesday, June 27, 2006 at 6:03pm in response to CREATIVE WRITING. This question has been asked

39. Thermodynamics

In exercising, a weight lifter loses 0.100 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. The work done in lifting weights is 1.30 x 10^5 J. (a) Assuming that the latent heat of vaporization

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

41. Chemistry II

A stock solution containing manganese ions was prepared by dissolving 1.542 g pure manganese metal in nitric acid and diluting to a final volume of 1.000L. Calculate the concentration of the stock solution. mols Mn = g/atomic mass Mn. M = mols/L 1.542 g /

42. Physics

The specific heat capacity of a material is 1200 J/(kg°C). The temperature of 3.0 kg of this solid material is raised by 6.0°C. Ignoring the work that corresponds to the small change in the volume of the material, determine the change in the internal

What is friction? Can you give me some examples? -THANK YOU FOR ALL YOUR HELP! friction: Ever have a pinwheel and move it through the wind? Friction makes the wheel turn. Ever on a bike an press the brake? Friction makes the wheel stop. Friction is the

44. Chem

The apparent equilibrium constant for the reaction A + B 2C is Kc= 4.11 at 298.2 K. Given that the initial concentrations of A, B, and C are .10M, .10M, and zero, respectively, find the equilibrium concentrations of A, B, and C. I had this long, drawn out

45. math

the length of a rectangular playing field is 5ft less than twice its width. If the perimeter is of the playing field is 230ft, find the lenght and width of the field. How would I even begin to set up the equatin let alone solve the equation

46. Math

Find the components of the unit vector that makes an angle of 210 degrees counterclockwise with the positive x-axis (-√3/2,-1/2) which would be the same as (cos 210º,sin 210º)

47. sociology

what are key features of social change? What are some examples of social movements? These sites should be of help with this question. http://en.wikipedia.org/wiki/Social_movement http://www.wsu.edu/~amerstu/smc/smcframe.html (Broken Link Removed)

48. Economics

Suppose you have an inflationary gap how would a classical economist, for example, explain how how to get rid of that gap? My Answer: I would think that the goods market would be affected. So, prices go down, aggregate supply decreases, and the aggregate

49. Language Arts

How do I find out what a block style letter, and what a semi-block style letter is, and how do I see a picture of it? Here are some good illustrations and explanations: http://englishplus.com/grammar/00000150.htm

50. help, bobpursely

Please take a look at DEVON's trig equation at 9:14 I must be missing something obvious. If the second had been 3sin 2x it would be a straight forward question. The way it stands I was able to "reduce" it to the equation 8sin^4 x - 8sin^2 x + 3sin x + 2 =

51. Vectors Help me pls!

Dtermine the value of a so that u=2i+aj+k and 4i-2j-2k are perpendicular Did you just start this topic? This is a very easy question. if two vectors are perpendicular, then their dot product must be zero then (2,a,1).(4,-2,-2)=0 8-2a-2=0 a=3

52. algebra

how would ou write an equation or inequality that could be used for analysis, prediction example gas prices? can some one explain to me how to write this I noticed you question before. I think it is much too vague and open-ended for a proper reply in this

53. Math

Find the unit vector that points in the same direction as the vector from the point P=(8,2) to the point Q=(5,9) Find vector PQ, then divide it by its magnitude.

I am given a project to Develop and Incorporate a Business. I decided about video game business for example companies that make big systems like xbox. What is the concept? Type of Entity?: LLC Reason for selecting Entity? Financial Assistance? Marketting

55. Math

Write as a single logarithm. Thank-you. 3(4 log t^2) Would it be logt^8 or are you not allowed to do that? And logy-4(logr+2logt) in the first one, what happened to the 3? my answer is log t^24 in the second... =logy - 4(logr + logt^2) =logy - 4log rt^2 =

56. science

What can happen to the reaction rate of a system that is heated and then cooled? Your question isn't quite clear; however, reaction rates increase, generally, with increase in T and decrease with decrease in T. Another way to interpret the problem is that

57. Health questions

We both asked these questions yesterday but we are both confused. 1.Giardiaqsis is a communicable illness transmitted: A. through direct and indirect contact with infected fecal material. (or) B. by touching the moist lining of the eyes and nose. 2. Lyme

58. Maths-Vectors Help!

Please can you help me as I have just been introduced to your Help Forum: Determine whether the vectors u, v and w given below are linearly independent or dependent where u, v and w are non-colliner vectors such that u=2a-3b+c , v=3a-5b+2c and w=4a-5b+c.

59. english

how does shifting the point of view [third person to first person] change the effect on the reader It's very confusing. If a story or essay starts out in 3rd person, the reader picks up on that and expects that to continue -- a shift to another POV is

60. Trig

solve to four decimals places 5.0118 sinx - 3.1105=0 :for all real x values I will be happy to critique your work. Solve for sinx, then arcsinx

61. math

the velocity in m/sec of a particle moving along the x-axis is given by the function v(t) = 7cos3t, 0 < t < pi/2 Find the particle's displacement for the given time interval Displacement is the ending point minus the starting point. Ending point is at

62. english

when writing an essay on this, is it ok to fill in the blanks with my own ideas? You should probably state that there is no definitive conclusion from the poet, but that you believe ... etc., etc. Thinking for yourself is always a good option, as long as

63. science- plz help me!

figure out a practical use for a lever with a mechanical advantage of one! See Saw? squaueo

64. Math-related rates

A lamp post is 6m tall. Frank is 1.6 m and walks toward the post at .5m/s. How fast is the tip of his shadow moving when he is 8 m from the pole? http://answers.yahoo.com/question/index?qid=20070405145054AANaa0r

65. Trig

Compute inverse functions to four significant digits. cos^2x=3-5cosx rewrite it as.. cos^2x + 5cosx -3=0 now you have a quadratic, solve for cos x using the equation cosx=(-5 -+ sqrt (25 +12)/2

66. Trig

solve to four decimal places 1.3224sinx + 0.4732=0 :for all real x values solve for sinx, then arcsinx. solve for sinx, then arcsinx. so its sinx= -.4732/1.3224 and i get -.36594 but how do you get the other values for a real x Ok, use your calculator.

67. Geo project. help.

I am suppose to create a power-point presentation on ONE of the following Canadian Landforms:Canadian Shield, Appalachians, Western Cordillera, Arctic Islands, Interior Plains, Great Lakes-St.Lawrence lowlands. My question is which one should I pick? Which

68. Decision Making

I am looking for information on (groupthink/devil's advocate). Why I need it. The CEO has been extremely frustrated with what has been occurring within the organization lately. In a recent manager meeting he exclaimed, "Everyone around this place just

69. Science

Which mixture will separate quickly when left uncovered out in the open? A. Air B. Cola C. Concrete D. Seawater

70. Social Studies

What a good topic from prehistory through the Enlightenment ages. Something interesting please. Topic for what: a few paragraphs, a short paper, or a long term paper? I always liked the history of witchcraft, the discovery of the solar system in which

71. poetry

i need to write a my eyes go to_____ but my heart goes to_____ poem and i need some ideas Thank you for using the Jiskha Homework Help Forum. Do the two words have to rhyme? Is your job only to fill those 2 blanks? eyes go to you, sleep, water (any noun)

72. trig

it says solve for all real solutions, compute inverse functions to 4 sigfigs. cos^2x=3-5cosx Devon, what grade level are these questions from? I am having the same problems as with your 9:14 post. Please see my partial solution in the post to bobpursely at

73. Physics

A bicycle starts at the origin of a circular track that has a circumference of 126 m and travels at a constant speed a distance s = 38.0 m in a time t = 12s. a)what is the angular displacement (in rad) of the bicycle from its starting position? r=20.1 so

What are the "Statue of Frauds" and what is it's purpose? This article tells about a statue that is claimed to be a fraud. http://www.cwnews.com/news/viewstory.cfm?recnum=31142

75. math

Please help me to find the range of each set of numbers.7, 7, 5, 4, 1, 9, 8, 8, 8, 5, 2 The range of a set of data is the difference between the highest and lowest values in the set. This is true whether there is one or more scores at either extreme value.

76. Physics 12

What is the gtravitational potential energy of a 2.00e3 kg staellite that is in an orbit that has a radius of 9.90e6 m around the earth? Use gravitational potential energy=0 at r=‡ (answer=-2.01e11J) What is the work done against gravity on the

77. science

dear sir i am so frigtened of thundery storm. the sounds make me fell that something heavy object is going to be fall doen from the sky.what is happpning to me plez help me doctor What ? HUH? Whats your question? If this is a legitimate question, you might

78. Elem. Ed.

Yesterday I asked this question and you told me the best answer is (C)at the time they enroll in childcare programs. The other answers make no sense. Complete immunization is usually required of children: A. who will be turning 2 years old. B. before they

79. stat

is this statement true? Hypothesis tests are dsigned to measure the amount of evidence that exists against the alternative hypothesis? Not in my experience. My experience is that hypothesis tests are designed to see if the hypothesis is true within some

80. trig

find the exact solutions (è in degrees) sin^2è+2cosè=-2 change the sin^2 to 1-cos^2, then rearrage the equation into quadratic form, use the quadratic equaion.

81. Scie

Which property is the same for each piece of broken up rock. A. Size B. mass C. Volume D. Melting Point The only intrinsic (look that word up)property is d. D. melting piont

82. social studies

How is Gouverneur Morris the first Modern American, what does it mean to be a modern American? A modern American is democratic. Why do you think Morris is considered the first modern American? http://www.jiskha.com/display.cgi?id=1176431857.1176472355

83. Chemistry II

Calculate the sodium ion concentration when 45.0 mL of 2.5 M sodium cabonate is added to 30.0 mL of 1.0 M sodium bicarbonate. mols Na2CO3 = M x L. Mols Na^+ = twice that. mols NaHCO3 = M x L. Mols Na^+ = 1 x that. Total Na = sum of the two.

84. math

5/10+12/16+(15/20-4/16) Well you need to solve in the parentheses first, by making them common denominators. (15/20 - 4/16)=(60/80 - 20/80) Then subtract. (40/80) then simplify. (1/2) Next make all the fractions with common denominators. 5/10 + 12/16 +

85. Calculus

The following Summation 1 2 1 2 1 2 ------ x - + ------ x - + ------ x - 1+(2/n) n 1+(4/n) n 1+(6/n) n is a right Riemann sum for this integral ç f(x)dx With subintervals [1,3] can someone help me solve for the inegrand which is f(x).?

86. math

Find the components of the vector from the point P=(8,-2) to the point Q=(5,9) You should really know how to do this if you are studying vectors. vector(PQ) = (5-8,9+2) = .....

87. Science

Which mixture will separate quickly when left uncovered out in the open? A. Air B. Cola C. Concrete D. Seawater I suggest you think about this and post your thoughts. Do you think air separataes upon standing? Do you think a cola will separate? What about

88. psychology

Who was a student of Freud's that parted ways with him over the theory of the unconscious? Carl Jung. Jung in my opinion was as flawed as Freud. http://www.jungiantherapy.com/dreamwork.shtml In fact, I have often wondered if psychoanalyst thinkers have one

89. Science

What is special about characteristic properties of matter? They do not change.

90. trig question

Compute inverse functions to four significant digits. cos^2x=3-5cosx cos^2x + 5cosx -3=0 now you have a quadratic, solve for cos x using the equation cosx=(-5 -+ sqrt (25 +12)/2 the back of the book says .9987+2kpi and -.09987+2kpi when i do it i don't get

91. social studies

Why was Gouverneur Morris forgotten over the years? Please tell us your answer, and we'll be glad to comment on it. Mack, I gave you sources on this topic earlier in the week. http://www.jiskha.com/display.cgi?id=1176431857.1176472355

92. Science

What happens in a circuit if there is a lot of resistance? heat

93. U.S.HISTORY

could hitler invated England or not? i need to know both sides. The word "could" means "was possible" - so was it possible that Hitler could have invaded England? Of course it's possible - but he didn't.

94. SPORTS PHYSICS

How does friction, velocity, and acceleration apply to volleyball? -thanks a lot if u help!

95. world history

I'm doing a resarch paper on African Imperialism to Modern Issues. where can I find an overview of life living under the foreign rule of Madagascar Africa,who took this nation over, and what life was like These sites may be of help.

96. Math

Evaluate [-7] - [-8] -7-(-8) = -7+8=+1 Always remember that a ( + and + gives us + ) and a ( - and - gives us + ) and a + and - gives us - Always when subtracting or adding take the sign of the biggest number which will be the sign of your answer , and

97. ALGEBRA 1

CAN SOMEONE PLEASE CHECK TO SEE IF I HAVE DONE THESE CORRECTLY. Thanks for your help. Solve by completing the square 1. X^2-6x=16 X^2-6x + (-6/2) ^2=16+ (-6/2) ^2 X^2-6x+36/4= 16+36/4 (X-6/2)=100/4 X-6/2= +or - 10/2 X=6 + or - 10/2 X=-4, X=8 2. 2x^2-3x+1

98. algebra "reiny"

how would you write an equation or inequality that could be used for analysis, prediction example gas prices? can some one explain to me how to write this i was going to do mine on diet how my sister last pounds on her diet she weight 410 lbs to begin with

99. chem

Ammonia is very soluble in water. Why? NH3 has a pair of unpaired electrons to which a hydrogen ion can add.

100. science

How does the eruption of volcanoes effect the enviornment, climate, water cycle, animals and plants? Thank you for using the Jiskha Homework Help Forum. Please visit the following: 1.

101. Science, one more time...

Insulation keep a house warm because it is a poor conductor of A. Heat B. Mass C. Sound D. Magnetism what do you think, and why?

102. Chemistry II

How much of solid potassium chromate whould you use to prepare 2.00 L of 0.400 M potassium chromate? M x L = mols g/molar mass = mols OR M x L = g/molar mass solve for g. .400 mol/L x 2.00 = g/194 g = 155.2 Thanks!!

How can you end a contract without facing legal action? Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. If there's not a tutor with this specialty online

104. math,algebra,correction

Is this correct: solve using the quadratic equation: 5x^-4x+1=0 My answer: x= (2)/(5) +/- (1)/(5)i Or should i combine the denominators to look like this: x= (2+/-1)/(5) i I don't like where you show the i I would write the solution as (2 +-i)/5 or 2/5

105. Algebra 1

(b+2)(b+6)= Try multipling the brackets out first and dont't forget BODMASS Multiply every letter and number in the brackets by the other munbers and letters in the other bracket

106. Science again...

what is going to be the same about frozen water and room temp. water? A. State of Matter B. Temperature C. Boiling Point D. Physical Properties The bp will be the same...

107. trig

find the exact solutions 2cos^2x+3sinx=0 the way it stands, that is a "nasty" question. Are you sure the second term isn't 2sin(2x) ? no, its as i wrote it. then it's got me stymied, I must be missing something rather obvious, sorry! thanks for trying!

(r/2) sq. would that simplify to r? do you mean (r/2)^2 which is (r^2)/4

109. math

of a set of 10 cards, 3 have red circles, 4 have yellow triangles, and 3 have green diamonds. you choose one card at random and then replace it. then you choose a second card. what is the probability that both cards have yellow triangles? Find the

110. math

What kinds of products are manufactured to be parabolic? Name some things that can be elliptical. Parabola: satellite dish, headlights ellipse: The “whisper chamber” in the United States Capitol is an ellipse, stand at one focus and whisper, and anyone

111. trig

find the exact solutions (¦È in degrees) sin^2¦È+2cos¦È=-2 range= 0¡Ü¦È

bobpursley/ drwls please help me with my post on Sunday, April 15 at 10:16pm and 10:19pm. Thanks!