# Questions Asked onFebruary 12, 2009

A student placed 10.5g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mL mark on the neck of the flask was reached. The flask was then shaken until

2. ## physics

a remote controlled car's wheel accelerates at 22.4 rad/s^2. if the wheel begins with an angular speed of 10.8 rad/s what is the wheel's angular speed after exactly 3 full turns?

3. ## chemistry: equations and reactions

identify the products when the following substances decompose: 1) binary compoound 2) metallic hydroxide 3) metallic carbonate 4) the acid H2SO3

4. ## Chemistry

is CH3CH2N or NO2 a lewis acid?

A 5-kg rock is lifted 2 meters in 5 seconds. How much work is done? How much power is done?

6. ## algebra

when the temperature stays the same, the volume of the gas is inversely proportional to the pressure of the gas. If a balloon is filled with 87 cubic inches of a gas at a pressure of 14 pounds per square inch. Find the new pressure of the gas if the volume

7. ## math

the roots of 2x^2 - 3x = 4 are a and b. find the simplest quadratic equation which has roots 1/a and 1/b

8. ## physics

need HELP!! which of the following exhibits parabolic motion a. stone thrown into a lake b. space shuttle orbiting Earth c. leaf falling from a tree d. train moving along a flat track which of the following does NOT exhibits parabolic motion a. frog

9. ## Chemistry

Consider a .900 M Al(NO3)3 solution. This solution has a nitrate ion concentration of:

10. ## Chemistry

How many grams of NaC2H3O2 (M=82.034 g mol-1) should be dissolved in 400 g of water to prepare a solution which is 11.28% NaC2H3O2 by mass?

11. ## Stoichiometry Test

3.Empirical formula is C4H5N2O.Its molecular weight is 194.19g/mole.The "empirical formula weight is about 97.1g/mole.What is the molecular formula ?

12. ## Reiny! Reiny! Reiny! Answer Check and HW Help!

Translate to a system of equations and solve: 1) The sum of two numbers is 36. One number is 2 more than the other. Find the numbers. Answer: (17,19) 2) Find two numbers whose sum is 66 and whose difference is 18. Answer: (37,29) These ones I am not sure

13. ## chem

An aqueous solution of nitric acid has a density of 1.084 g mL-1 and a measured concentration of 2.580 molar. What is the percent weight of nitric acid in the solution.

14. ## Chem 12

Given the two reactions: 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) --> 5Fe3+ (aq) + Mn2+(aq) + 4H2O(l) 2MnO4-(aq) + 5C2O42-(aq) +16H+ --> 2Mn2+(aq) + 10CO2(g) + 8H2O(l) A.) Which reaction will occur at a faster rate? B.) Explain the reason for this result by

15. ## Algebra

Write a system of inequalities to describe the shaded area of the graph. This is the question on my homework today that i just don't get. My teacher said to use point slope form. y=y1+m(x-x1) The coordianate points of the triangular area are line 1:

16. ## Stoichiometry Test

4.A compund is found to have(by mass)48.38% carbon,8.12% hydrogen and the rest oxygen.(What % is missing to make the sum 100 %?) That is,figure % oxygen.What is its empirical formula?

18. ## Geography

Name a large bay east of maine?

19. ## Chemistry HELP!

A student placed 10.5g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mL mark on the neck of the flask was reached. The flask was then shaken until

20. ## organic chemistry

in a reaction with 9-fluorenol and sodium hypochlorite (with acetic acid) that is supposed to yield 9-fluorenone, what could be a possible reason for error if the solution of 9-fluorenol, sodium hypochlorite, and acetic acid was heated too high? (around 80

21. ## physics

I'm not sure how to solve this..a baseball is popped straight up into the air and has a hang-time of 6.25s. Determine the height to which the ball rises before it reaches its peak.

22. ## Stoichiometry Test

What is the percentage of oxygen in____? Mg(OH)2

24. ## world geo

An isthmus is a narrow strip of land located between two water bodies that connect two larger land areas.find a central american country that is an isthmus. i do not know how 2 answer this question:( please please help:) thank u

25. ## sociology perspective

Every four years in the United States there is a presidential election, and after the election, nearly half the population readily accepts the leadership of the person for whom they did not vote. This is an example of: egalitarian authority charismatic

26. ## Spanish

Fill in the brackets with a correct definite or indefinite article. 1. Nosotros somos (los) estudiantes de Buenos Aires. 2. Ellos son (los) amigos de Gisela. 3. Ustedes son (unas) personas estudiosas e inteligente. 4. Tu eres (el) hombre de Vallodolid. Are

27. ## social studies

what natural resources made portland a good location for a city?

28. ## social studies

How did the geography of ancient Greece cause it to separate into independent communities?

29. ## Pre-Cal (verifying trig identities)

How would you verify the identity? sin^1/2x-cosx-sin^5/2xcosx=cos^3xradsinx

30. ## science

measurement of an average classroom door is closest to 1 meter

31. ## Intermediate Algebra Word Problem

A map's key indicates that 3/4 of an inch represents 60 miles. How many miles does 2 1/4 inches represent? in/mi 3/4 / 60 = 2 1/4 / x 3/4x = 60(2 1/4) .75x = 60 (2.25) .75x/.75x = 135/.75 x = 18mi. Is this correct?

32. ## chemistry

the thing that is troubling me is that NO2 is not (NO2)- does that change it from being considered a lewis base to a lewis acid?

33. ## Science

If a block could be molded into a flatter and longer shape, then which one would happen and can you explain? a. mass, volume, and density all would change. b. volume would change, but the mass and density would remaine the same. c. mass and volume would

34. ## science

Why do most streams in NY state have a greater stream discharge runoff in spring than in summer? 1 Potential evaporation and transpiration is greater in spring than in summer. 2 More transpiration occurs in spring than in summer. 3 Most area of NY state

What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! -J

36. ## Physics

A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot was in view for a total of 0.37 s, and the top-to-bottom height of the window is 2.20 m. How high above the window top did the flowerpot go? S= ut +(1/2)at^2 S=

37. ## Engineering

5. Two pieces of steel are held together with six bolts. One end of the first piece of steel is welded to a beam and the second piece of steel is bolted to the first. There is a load of 54,000 pounds applied to the end of the second piece of steel. The

38. ## college

What is the molecularity of the elementary reaction? SO_3(g)-->SO_2(g)+O(g)

39. ## science

measurement of an average classroom door is closest to 1 meter

40. ## statistics

I don't understand how to answer this: relate the three measures of central tendency to a normal distribution- I looked it up online and it said that the mean, median, and mode are all the same but i don't understand how that can be

41. ## algebra

How is doing operations (adding, subtracting, multiplying, and dividing) with rational expressions similar to or different from doing operations with fractions?

42. ## To Stephanie -- Com130

I've removed your post because it doesn't apply to the Jiskha forum. We have no way of reading your peer's posts on any Axia board. Please repost with your ideas about proposal writing and we'll be glad to critique them.

43. ## art history help please!

If you could please check these and just let me know which ones are correct! also if you have any input on a better answer, or atleast where i can find a better answer, i would greatly appreciate it! This artist painted scenes of upper-class recreation:

44. ## Chemistry!!

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? THANKS! -J

45. ## sociology

G. William Domhoff's view of the power structure of the United States most closely resembles the analysis of which sociological perspective? Functionalist perspective Conflict perspective Interactionist perspective Global perspective it isnt conflict, or

The Texas state dish is chili. Alexi made 6 quarts of chili and served it at a party. He had 1/3 of the chili leftover. How many quarts did he have left? I can't figure this out! Please help, my math worksheet is talking about equivalent fractions!

What mass of propanoic acid, CH3CH2COOH, pKa= 4.87, should be dissolved in water to 2.00L volume in order to produce a pH of 2.50? THANKS! -J

48. ## Precalculus

what is the area of a pastry used to cover a slice of bery pie having outer crust arc of 7.6 cm and a central angle of 30 degrees? My answer: 661.88 cm sqr Answer: 55.2 cm sqr Thanks.

49. ## math

How do you find the definite integral of an absolute function? ∫_0^3|2x-3| lower limit= 0 upper limit = 3

50. ## juvenile justice

What are the major differences between the contemporary criminal (adult) justice system and the juvenile justice system? Are the major differences appropriate, given the differences between adults and children? Explain your answer.

51. ## math

does anyone know how to do pizzazz worksheets, i'm having trouble with mine.

52. ## Engineering

Determine the required nominal diameter of a threaded steel rod to carry an axial load of 16,000 pounds in tension if the tensile stress of 20,000 psi is permitted.

53. ## Algerbra

Help please show steps to solve. Two records and three tapes cost \$31. Three records and two tapes cost \$29. Find the cost of each records and each tape. No examples to guide me. thanks, Carol

54. ## law of motion

the strongest fundamental force.

55. ## Unscramble a word

Can you unscramble these two valentines words for me? IENGTGER, AND RMIEDAR

56. ## Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

57. ## Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? Thanks

58. ## Maths

State the minimum or maximum value of Y and the corresponding value of X of Y=9-(2X-1)^2. Hence sketch the curve, indicating the Y-intercept. Thank you a lot in advance.

59. ## chemistry -IMPORTANT-

we have to make an instrctinal packet showin relationships between moles and concentration. i cant find the following 1)how is the number of moles dissolved in a set amount of solvent related to the molarity? 2)how to determine the amount of solvent in

60. ## art

does anyone know where the yellow cow painting by Franz Marc i displayed?

61. ## science

As the temperature of soil decreases from 10 degree celcius, what will most likely happen to the infiltration rate of water through it? please help i have no idea about it. thank you.

62. ## chemistry

how much heat is absorbed if 200g of water changes from 20 C to 80 C?

63. ## 205 ctr

Sure, I’ve heard that it’s better to not eat cheeseburgers every day, but it’s extra protein and protein is good for you.

65. ## chem

A water solution which contains magnesium chloride as the only solute measured 232 parts per million chloride on an analytical instrument using a specific ion electrode as the sensor unit. When converted to moles per liter what value would you get for the

66. ## college

the relationship between the dosage, x, of a drug and the resulting change in body temperature is given by f(x)=x squared(4-x) for 0 greater than or equal to x greater than or equal to 4. make sign diagrams for the first and second derivate and sketch the

67. ## Intermediate Algebra Simplify

Simplify: this is a triple decker fraction 1/a + 1/c divided by a^2 - c^2 divided by ac I am stuck on this one please help.

68. ## Stoichiometry Test

THIS TEST IS DUE IN 15 MINS AND I JUST NEED HELP ON HOW TO DO IT LIKE THE STEPS FOR THEM ??

69. ## Biochemistry

I need to copare and contrast gel electrophoresis and paper strip electrophoresis... I know what both of them are, but I need to explain in terms of the charges on the proteins.. and I need to describe the polyacrylamide gel electrophoresis method in terms

70. ## Math

Which example is a function and which is not? Explain why. 1. Each student takes a selection of art classes. 2. Each student is placed in a math class. Please Help!! Thank You so much!!

71. ## math

how do I simplify? (secө/ (secө-tanө)) - secөtanө

72. ## chemistry

can you check if I did the problems correctly? thanks! a soln of NaOH is prepared by dissolving 5.0g of NaOH in 500mL of water, the nadding additional water to make 1.0 L of soln. What is the pOH and pH of this soln? [OH-]=(5g/40g)mol/1L pOH=-log(1/8)=.90

73. ## physics

which is the X axis and which is the y axis. Is there a way to remember it?

74. ## statistics

How do ethics affect your chosen level of significance? I am not sure if I understand what the instructor is wanting can some look at my answer and see if I am close and if I am missing something Answer: The level of significance to my understanding is

75. ## SCI 245

Discuss in 200 to 300 words, the importance of the science of geology to us as a civilization. Give at least two examples. For example, the ability to predict earthquakes and other disasters, or understanding mining and the use of natural resources

76. ## college

I need a full sentence outline on a thesis. The thesis is "Although children are taught the basics in school there needs to be more emphasis on the lower grades to be susre children who have difficulties are discovered early to get the help needed to stay

77. ## computers

2. Final Project: Bead Bar Systems Development Project • Resources: Appendix A, Information Systems Technology • Due Date: Day 7 [Individual] forum • Plan a systems development project for the Bead Bar, using the seven standard systems development

78. ## Math

Which example is a function and which is not? Explain why. 1. Each student takes a selection of art classes. 2. Each student is placed in a math class. Please Help!! Thank You so much!!

79. ## Math-Algebra

i don't understand how to graph an equation. can anyone help me please? i'll greatly appreciate it. Example: 3x+4y=12

where can i get help with the geometric shapes

81. ## Algebra

I am thinking of a number.It is a multiple of 3 but not 6.It is greater than 25^2 but less than 30^2.The units digit is a perfect square and the sum of the other two digits is the square root of 81. What is my number? A three-dimensional model of a city

82. ## chem

how do you prepare a solution using the proper lab equipment(both from dry solid and a stock solution) i researched it but all i found was the definition for stock solution any help please!!

83. ## Healthcare

I need some help with find information on what are the implications for patients? What types of reform efforts are being implemented to improve caregiver’s socialization skills?

84. ## math

if the ones digit ofa numbre greater than 1 is 0, what factor or factors must that number have? a.2 only b.5 only c.2 and 5 d.neither 2 or 5

85. ## 205 ctr

It’s disgraceful that a member of the Elks Lodge would go out to fast food restaurants every night. The Elks believe in family values, including home-cooked meals.

86. ## government

What determines who holds the postion of speaker of the house?

87. ## Algebra

i need help on my homework. how can i graph this equation? y-3=0

88. ## AED

help please... 350- to 500-word response to the following: You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these

89. ## math

(dy/dx)=X^3/8 - 1/2x^3. what is sqrt( 1+(dy/dx)^2 ) and that multiplied by (dy/dx)

90. ## science

As redioactive material decays and the percentage of new material in the original sample increases, does the age of the sample substance increase, decrease, or remain the same?

91. ## stats!

Abe looked at fundraising over the last decade. In the six seasons where the football team won less than 40% of the games (losing seasons) Abe was only able to raise an average of \$1.2 million in contributions to the Athletic Department (adjusted to

92. ## Algebra

Suppose that x = 2-t and y = 4t+7. a. If x=7, what is y? b. If x=-3, what is y? c. Find y in terms of x. I don't know how to solve this, since x and y are in different equations. Could you please walk me through it? Thanks!

93. ## French

Can someone tell me if these sentences are all grammatically correct? Merci! elle serait contente de nous conduire au magasin le 8 avril. Nous pouvons y emmener deux personnes.

94. ## math

Can you explain this to me please? sin2 A + cos2 A = 1 ... (1) 1 + tan2 A = sec2 A ... (2) 1+ cot2 A = cosec2 A ... (3)

95. ## math

can anyone help me with this problem? 6x-5y+20=0

96. ## english

can anyone find me chapter summaries for the book "the sturdy oak" please

97. ## chemistry

A student adds 1.00x10^-8 moles HCl to a liter of soln. The resulting soln will be acid, basic, neutral, or impossible to determine? I believe that it is impossible to determine, because it does specify that the temperature was at 25*C. Which of the

how do you write a ten paragraph essay?

99. ## art

i am doing a project about franz marc an i need some info on one of his animal paintings this info consists of: name: when it was made: how it was made: what it was about: does it tell a story: what is in it: is it happy sad boreing etc: how you feel: and

100. ## repost chemistry

A student adds 1.00x10^-8 moles HCl to a liter of soln. The resulting soln will be acid, basic, neutral, or impossible to determine? I believe that it is impossible to determine, because it does specify that the temperature was at 25*C. I know that a

101. ## college

How is doing operations (adding, subtracting, multiplying, and dividing) with rational expressions similar to or different from doing operations with fractions? Can understanding how to work with one kind of problem help understand how to work another

102. ## Intermediate Algebra Solve

x + 1 / x = 3/2 x + 1(2) = 3x 2x + 2 = 3x -2x -2x 2/1 = 1x/1 2 = x Is this correct?

103. ## Math

How long one can hold their breath can be calculated using the formula y=1.4g where y is the amount of time one can hold their breath in seconds and g is the size of their lungs in cubic centimeters. Is this a relation or a function? Explain why. Please

104. ## Algebra 2

Can someone helpe me solve this equation . Help me break it down please..becuase i have tried to do it mnay times but have fallen short... [SQRT(x + 3)] - [SQRT(x - 2)] =1

105. ## physics

1.if frequency increases twice, how it change the energy carried by one pulse? (It may have no effect) 2. if the humidity of the air increased, what quantities will be affected: frequency, period, speed, and wavelength

106. ## Science

How can you divide a mixture of iron and iron sulphide, without using a magnot?

107. ## PHYSCIAL EDUCATON

ANALYZE THE EMERGENCE OF PROFESSIONAL SPORT?

108. ## important operations

simplify (2x+3)(x-4)= HELP !!

109. ## Stoichiometry Test

Thanks Damon i got a couple more lolz 2.Determine the formula mass of (NH4)2C4H4O6

110. ## Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? Thanks Responses Chemistry - DrBob222, Thursday, February 12, 2009 at 10:00pm Let's call acetic acid HAc. Then the ionization is HAc ==> H^+ + Ac^- We will call the

asked by Chemistry - Repost for DrBob222
111. ## math

what would the antiderivative of e^-2x be? and if the antiderivative of that is -1/2e^-2x, what would that antiderivative be?

112. ## uop

: Reflect on your own worldview and compare it with the worldviews presented in the text. Provide examples of the benefits of your view to defend your position.

113. ## Math

How long one can hold their breath can be calculated using the formula y=1.4g where y is the amount of time one can hold their breath in seconds and g is the size of their lungs in cubic centimeters. Is this a relation or a function? Explain why. Please

114. ## spelling

analogy for fly that has four letters

115. ## SOSE

WHY DID THE 1962 AVALANCH OF PERU HAPPEN

116. ## lit.

persue:contract::

117. ## math

how do I do this? I think I have to simplify it? (sin^2ө + cos^3ө/sinө + cosө)+ sinөcosө

how do you solve and graph variable inequalities?

119. ## math

A base raised to a NEGATIVE exponent is equivalent to _______________.??? plz help me with the word. thanks.

120. ## social studies

Portland, Oregon sorry

121. ## Intermediate Algebra Solve

Solve: -1/3 - 5/4t = 3/4 - 1/6t would I cross multiply? (-1)(4t) - (3)(5) = (3)(6t) - 4 I am stuck here, please help.

122. ## math

how do u solve x+3=0? its very confusing.

x+5=-3

124. ## math

(dy/dx)=X^3/8 - 1/2x^3. what is sqrt( 1+(dy/dx)^2 ) and that multiplied by (dy/dx)

125. ## science

Where does convergent motion take place?

x + 5 > 9 =