# Posts by michele

Total # Posts: 396

1. ### Chemistry

1-1H + 3-1 H yield 4-2 He What is energy in Kj per mole?

3. ### Chemistry

A) K=.693/55sec =1.26xE-2 N=e^-3.73*1E-6 N=2.28E-8 %=N/No*100=2.28% B) Nt=1E-6* e ^(-(.693/55)*3600 sec) = 1.984E-26/1E-6*100 %. 2E-18% Very small number!! I've done it 3 times?
4. ### Chemistry

A 1.00x10-6g sample of nobelium- 254, has a half-life of 55 seconds after it is formed. What is the percentage of nobelium-254 remaining at the following times? (a) 5.0 min after it forms (b) 1.0 h after it forms
5. ### Chemistry

Lithium 7 decays losing one alpha particle what is left? 7H 1
6. ### Chemistry

I think it's a crappy question, a and b section of introduction question all talk about teaspoons of sucrose and calories associated. That leads one to believe we are dealing with nutritional Calorie = 1000 calories right? I don't think it's a heat of vaporization ...
7. ### Chemistry

It's a can of coke problem.... 355 ml of water (assume coke=water)140 Cal in the can. Using energy from sugar in can. What final temp would be reached if initial was 25 deg C. ?
8. ### Chemistry

It's 140 Kcal. I got Tf 419.4 deg C. This seemed very high and I can't figure out error
9. ### Chemistry

140 Cal to heat 355 gm of water with initial temperature of 25 degree celsius, final temp?
10. ### Chemistry

I did it right thank you for confirmation!
11. ### Chemistry

CuS is oxidized by molecular oxygen to produce gaseous sulfur trioxide and solid copper (II) oxide. Write 2 balanced half reactions
12. ### Physics

Ok, my Physics professor gave us this to do uncertainty propagation with these equations. Can some please show me some examples on each of these so I know I'm doing them right? Uncertainty Propagation Since raw data includes uncertainty, all calculations include ...
13. ### Math

If 1/3 of a gallon of paint covered 3/5 of the room I was painting, how much paint (gallons) would it take to cover the entire room?
14. ### Math

The scale of a map is 1/8 inch = 10 miles, If 2 cities are 3 inches apart on the map, how many miles are they from each other ?
15. ### Math

A 500 ml bag of penicillin G contains 250,000 uniys. The patient received 300ml. How many units of penicillin G did the patient receive?
16. ### Chemistry

At 25 degree celsius, which balloon has the greater volume, an oxygen balloon O2 at 1.2 atm with a mass of 16.0 g, or helium He balloon at 1.2 atm with a mass of 2.0 g?
17. ### Pharmacy

Weekly

P(x,y) moves such that its distance from point Q(4,8)is twiceits distance from point P(-2,3). Find the equation of the locus of moving point P.

The mean of a set of numbers 1,y,1,2y+2,13 and 16 is 9. Find the value of y and the variance.

George has planted several types of vegetables for his own consumption on an empty rectangular plot of land beside his house. He wants to fence the land as a dimension of (12x)m and (4-x)m. Find the length, in m of the fence he has to buy when the area of the land is maximum.
21. ### Add Math(rate of change)

The volume of a cylinder increases at a rate of 324cm cube per second. The height, h cm of the cylinder is twice the radius, r cm. Find the rate of change in radius when the radius is 6cm.(use 3over2 pai)
22. ### science

You need to make a 2 fold serial dilution starting at 1:100 and ending at 1:3200. You need 2 ml in each test tube when you are finished. You have 40 microliters of serum. do you have enough?
23. ### English

Identify the main conflict from "the fall from the house of usher " and show what it reveals about the story's protagonist . I have studied this story and I'm not able to find one main conflict, I have found a couple but none add up to the point of what it ...
24. ### math

yesterday, lena had 55 baseball cards. Today she gave c away. using c write an expression for the number of cards lena has left.
25. ### Math

Round 5,156 to the nearest ten.
26. ### math

grant needs 2/3 cup of raisins and 3/4 cups of almonds to make trail mix. which statement can be used to find out if there are more raisins or almonds in the mix?
27. ### Chemistry

I am trying to determine the net ionic equation for Fe(NO3) and K3 PO4, can you help, I'm having a difficult time?
28. ### Pre-Algebra Calculus

NEED HELP PLEASE Mixture Problems 1.Joe created a metal containing 40% platinum by combining two other metals. One of these other metals weighed 12 lb. and contained 45% platinum. If the other weighed 3 lb. then what percent of it was platinum? 2. 12 gal. of a saline solution ...
29. ### chemistry

if i have a 21% solution of a product, and i need to make it a 9% solution of the same product what do i do? i am trying to dilute a product that is 21% to a 9% soultion so it can safety be used on cats. i know what to dilute it with, but i do not know how much or the math to ...
30. ### Math

The total number of pears eaten by Pete and two of his friends, Tweet and Honk, (during this visit to the pear tree) were in the ratio of 2 : 3 : 5 respectively. If Pete ate 12 less pears than Honk, how many pears did Tweet eat during this time?
31. ### Maths

Thank you, Ms. Sue
32. ### Maths

Sorry, I am very stupid here - - what is the * used for?
33. ### Maths

What is the daily interest rate for the following amount: \$598 for 186 days at 7.75% APR
34. ### Trig

Use the FOIL method. Make sure that you write each more complex function in their sin/cos components. You should be able to cancel a lot and wind up with only sin theta plus cos theta.
35. ### Precalculus Trig (Geometry)

A rectangular doorway is 38 meters wide and 60 meters high. The doorway is capped with a semi-ellipse that is 13 meters high at its center. Find the height h of the doorway and window 5 meters from the center. From the ellipse equation, I can see that a should be 19 and b ...
36. ### Precalculus Trig (Geometry)

A large doorway has the shape of a parabolic arch. The doorway is 20 feet high at the top of the arch and 20 feet wide at the base. At a height of 10 feet above the floor, find the width of the arch. If you start the vertex of the parabola at 0,0, that means the equation ...
37. ### algebra

Make the following model: 40000-400x < 25000 Plug in some numbers for x.
38. ### algebra

A penny has a 1 cm radius. What is its diameter? Its circumference? its area?
39. ### math

(2,−2);{y<x−3 y>−x+1
40. ### MATH

SHELDON CAN RUN A MILE IN 6 4/5 MINUTES, HOW MANY MILES CAN HE RUN IN 30 MINUTES.

16,8,4,2
42. ### math

The ratio of red jelly beans to yellow jelly beans in a dish is 3.4. If Greg eats 3 red ones and 6 yellow ones, the ratio is 4.5. How many yellow jelly beans were originally in the dish? Do you make 3.4 a fraction and 4.5 a fraction and times them? 3/6 TIMES 4.5 = 12/20 THEN ...
43. ### Algebra

A bag has 2x+1 red marbles, 3x blue marbles, and x+2 green marbles. What is the probability of picking a red marble?
44. ### Algebra

Compound inequalities 4x+7<11 or 1-x<=-2
45. ### Algebra

sorry I wrote it wrong it is 4x+7<11 or 1-x<=-2
46. ### Algebra

4x7<11 or 1-x<=-2 compound inequalities
47. ### Algebra

compound inequalities -10<-2+8x<22
48. ### algebra

2b-2/2b^2-8 (find domain to rational expression)
49. ### Algebra

Using the ac method factor the trimonials. 15x^2 + 31x+2=
50. ### Algebra

Using the ac method factor the trimonials. 15x^2 + 31x+2=
51. ### Fin/571

3. Bell Mountain Vineyards is considering updating its current manual accounting system with a high-end electronic system. While the new accounting system would save the company money, the cost of the system continues to decline. The Bell Mountain’s opportunity cost of ...
52. ### math

I need a prime and composite factor chart. Can you help me?
53. ### zeros in the quotient

explain why estimating before you divide 624 divide 6 helps you place the first digit in the quotient.
54. ### Chem

Ka1 = 4.5E-7 and Ka2 = 4.7E-11 for the carbonate system. Ksp is 5.0E-9 and Kw =1.0E-14. A town’s groundwater has [Ca2+] = 37 mg/L, alkalinity of 1.36E-3eq/L and pH of 8. This is to be mixed with surface water with [Ca2+] = 4mg/L, alkalinity of 8.0E-4 eq/L and pH of 9.5. ...
55. ### Stats

two tailed test for experiment with N= 24. Can't find table of t critical values, but tcv@ df=13. Compared tobt with tcv. Will this more likely create type I or type II error?
56. ### math

the product of 237 and 13
57. ### physics

The load-bearing piston in a certain hydraulic system has an area 20 times as large as the input piston. If the larger piston supports a load of 2000N, how large a force must be applied to the input piston? A certain boat displaces a volume of 4.5m3 of water (the density of ...
58. ### Civ/Hum

How is Modernity reflected in the movie Metropolis
59. ### english

assign each word a part of speech A mistake at a pharmacy sent to the hospital.
60. ### Grammar

What are the nouns in the sentence whales have brains as big as watermelons.
61. ### Ochem

Which Alkene is capable of stereoisomerism: 1-pentene, 2-methyl-1-pentene, 2-methyl-2-pentene, 2-pentene, or 2,3-dimethyl-2-butene?
62. ### Criminal justice

Write a 700- to 1,050-word paper in which you describe the issues facing police departments in today’s society. · Include a description of how local, state, and federal law enforcement agencies currently interact with the U.S. Department of Homeland Security (DHS...

4,000
64. ### math

Janet took out a loan of \$50,000 from Bank of America at 8 percent on March 19, 2006 which is due on July 8, 2006. Using exact interest, the amount of Janet's interest cost is
65. ### chemistry

Fill in the missing value for V. P=1.2 atm, n-5.00 and T= 300.15 K....how do I set up the PV=nRT or do I solve in a different way?
66. ### economics

Is limitless growth really possible? What forces do you think will be most important in slowing or halting economic growth?
67. ### math

rounded to the nearest ten i am 12750. i am a multiple of 2 i use only 4 different numbers in all my 5 places.
68. ### Spanish

javier le presta el abrigo a maripili
69. ### Physics

Suppose a cylindrical platform with moment of inertia 0.005kg m2 is freely rotating at angular speed 10 rad/s. A disc initially, rotationally at rest with mass 0.6kg and radius 0.1 m is dropped onto the platform so that their centers coincide. The kinetic frictional ...
70. ### MATH

A polygon has 20 diagonals .how many sites it have? ans 8 BUT HOW DO WE GET IT
71. ### MATH

Ten different letters of an alphabet are given .2 of these letter are followed by two digits are used to number the product of a company .in how many ways product can be numbered? ANS CHOICES ARE 52040 8100 5040 1000 4000
72. ### math

how many five doght numbers can be formed using the digts 0,2,3,4,and 5. when repetition is allowed such the number formed is divisible by 2 or 5 or both. ans. choices are: 100 150 3125 1500 125
73. ### math

how many 5 dight numbers are there with distinct dights. ans choices arw 144 27216 4386 6843 720 I need to see how to solve it step by step thanks
74. ### math

Find the number of words which can be formed by using the letters of the word EQUATION if each word has to start with a vowel. this a permutation question ans, choose are 40320 1260 1080 400 25200
75. ### MATH

Find the number of words which can be formed by using the letters of the word EQUATION if each word has to start with a vowel.
76. ### math

Find the number of words which can be formed by using the letters of the word EQUATION
77. ### math

In how many ways can 15 stduents be seated in a row such that the 2 most talkative children never sit together? answer choose are a. 14!,14! b. 15,14! c.14! d. 14!13 e. 15!
78. ### math

A teacher prepares a test. She gives 5 objective type questions out of which 4 have to be answered. Find the total ways in which they can be answered if the first 2 question have 3 chioce and the last 3 have 4 choices. I think this a permutation question need help
79. ### math

What is the largest possible domain for the function? F(x) = ã x + ã (4 - x^2)
80. ### math

if you join all the vertices of a heptagon how many quadrilaterals will you get?
81. ### math

What is the largest possible domain for the function f(x) = sqrt x + sqrt(4 - x^2) ?
82. ### math

if Y = -X^2 -6x - 8 find the value(s) of x when y =1. ans choices are -3 3 o 9 i need help working this problem
83. ### math

If A = {a, b, c, d} and B = {-1, 0, 1} which of the following relations is a function from A to B. a.(i) {(a, 0), (c, 1), (d, -1)} b.(ii) {(a, -1), (b, -1), (c, 0), (d, 1)} c.(iii) {(a, 1), (b, 1), (c, 0), (d, O)} d.(iv) ({a, 1), (b, 0), (c, -1), (o.O), (a, -1)} answer choice ...
84. ### math

What is the largest possible domain for the function f(x) = ~x + ~(4 - x^2) ? a.{x: O:::;x:::;2,x ER} b.{x: -2 :::;x :::;2, x E R} c.{x: 0 s X :s 4, X E:R} d.{x: x 2': 2, x ER}
85. ### math

if Y = X2(xsquared) -6x - 8 find the value(s) of x when y =1. yes there was a typo its x squared i don't know how to rise the 2
86. ### math

if Y = X2(xsquared) -6x - 8 find the value(s) of x when y =1. yes there was a typo its x squared i don't know how to rise the 2
87. ### math

if Y = _X2 -6x - 8 find the value(s) of x when y =1.
88. ### Complete subjects and predicates

A young boy asks for help.
89. ### math

. Two groups of students are using a dynamic geometry software program to investigate the properties of quadrilaterals. The first group has concluded that the diagonals of a quadrilateral always bisect each other. The second group of students is not convinced. Which of the ...
90. ### math

While investigating the properties of parallelograms using a dynamic geometry software program, a student notices that the diagonals of a parallelogram seem to bisect each other. The student conjectures that this statement is true for all parallelograms. Which of the following...
91. ### alegebra

amelia gets 4 points for each correct answer and loses 1 point for each worng answer. One her last quiz she earned 50 points and answered 25 questions. write a system of equations
92. ### macroeconomics

As an economist, you have been asked to write a letter to a meeting of international professionals to explain the differences between microeconomics and macroeconomics and to provide real-world examples. Please write a letter of 4–6 pages including, but not limited to the...
93. ### math

Cuts of beef/High fat/Low fat/ total Flank steaks/ 74 / 386 / 460 Rump roasts/ 258 / 142 / 400 Total /332 /528 / 860 A USDA inspector is grading cuts of beef at a meat packing plant. If a piece of beef is selected at random, what is the probability that it will be a flank with...
94. ### math

a box contains 5 red and 4 blue balls. In how manys ways can 4 balls be chosen such that there are at most 3 balls of each colour.
95. ### math

a solid cube of a aluminum has sides 9cm long. A metallurgist would like to melt the cube down and use all the molten aluminum to make three smaller, solid congruent cubes. What should the lentgh, in centimeters, of a side of one of the smaller cubes?
96. ### math

two teams meet in playoff series at the end of the regular season. Team A won 55 of 81 games played in its home stadium during the regular season, while Team B won 48 of 81 games played in its home staduim. The first two games of the series will be played in Team A's home ...
97. ### math

two teams meet in playoff series at the end of the regular season. Team A won 55 of 81 games played in its home stadium during the regular season, while Team B won 48 of 81 games played in its home staduim. The first two games of the series will be played in Team A's home ...
98. ### geometry

If the area of a square is 100 cm. What is the area of each triangle produced if you draw two diagonals in the square?
99. ### chem

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF
100. ### chem

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF
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