Monday
December 22, 2014

Posts by Lisa


Total # Posts: 3,062

chemistry
You wish to remove nitrogen from the near-surface region of a plate of cobalt which is 1.0 cm thick. The plate is placed in a furnace at 417∘ C where an atmosphere of H2 and NH3 reacts with the nitrogen in the cobalt and fixes the surface concentration to 111 ppm (parts ...
December 7, 2012

chemistry
You wish to remove nitrogen from the near-surface region of a plate of cobalt which is 1.0 cm thick. The plate is placed in a furnace at 417∘ C where an atmosphere of H2 and NH3 reacts with the nitrogen in the cobalt and fixes the surface concentration to 111 ppm (parts ...
December 7, 2012

chemistry
You wish to remove nitrogen from the near-surface region of a plate of cobalt which is 1.0 cm thick. The plate is placed in a furnace at 417∘ C where an atmosphere of H2 and NH3 reacts with the nitrogen in the cobalt and fixes the surface concentration to 111 ppm (parts ...
December 7, 2012

chemistry
You wish to remove nitrogen from the near-surface region of a plate of cobalt which is 1.0 cm thick. The plate is placed in a furnace at 417∘ C where an atmosphere of H2 and NH3 reacts with the nitrogen in the cobalt and fixes the surface concentration to 111 ppm (parts ...
December 7, 2012

chemistry
An undesirable consequence of welding steel by acetylene torch is the rise in hydrogen concentration in the metal. That hydrogen contamination embrittles the steel. The metal is typically subjected to a vacuum heat treatment to restore ductility. A steel part is placed in a ...
December 7, 2012

chemistry
"Carburization" of pure iron (Fe) is carried out at 950∘ C. It is desirable to achieve a carbon content of 0.9% at a depth of 0.1 mm below the surface. A constant supply of carbon at the surface maintains a surface concentration of 1.2%. Assuming the ...
December 7, 2012

math
make a 5 by 5 tile uisng 5 different colors. None can be in the same row nor be diagional.
December 7, 2012

Chemistry
Using Dimensional Analysis One mole of sillicon has a mass of 28.1 g, and one mole of oxygen has a mass of 16.0 . What is the mass of one mole of sillicon dioxide.
December 6, 2012

PHYSICS - PLEASE HELP
total momentum = m1(v1)+m2(v2)+m3(v3) total momentum = [(5)8]+[(-4)15]+[(2)3] total momentum = (40)+(-60)+(6) total momentum = (-20)+(6) = -14 Answer: A
December 6, 2012

5th grade math
Jason ate lunch at Virginia’s Diner. If his meal cost him $11.00, and he wants to leave Virginia a 15% tip, how much money should Jason leave for the total bill? A. $11.50 B. $12.00 C. $12.36 D. $12.50 E. $12.65 how do you do this?
December 4, 2012

Chemistry?HELP
Is carbon graphite or a diamond harder to break or scratch and why. You must use an explanation of molecular geometry, intermolecular and intramolecular forces to answer this question. I'm confused...
December 4, 2012

Chemistry
The fictitious compound, arrhenium fluoride ( ), reacts with itself to form a dimer with the formula Ah2F2 . The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor filled with AhF to a ...
December 4, 2012

CHM
Predict whether the following bonds are ionic, covalent, or polar covalent based on the bonding atoms electronegativities: N2 The Al-O bond in Al2O3 MgO CuS
December 3, 2012

MATH
From HOME TO THE FAIR IT'S 70 MILES, I have driven about 30 miles at 40 miles per hour. how many hours would it take me to finish the remaining miles?
December 3, 2012

accounting
On September 1, 2013, Jacob Furniture Mart enters into a tentative agreement to sell the assets of its office equipment division. This division qualifies as a component of the entity according to GAAP regarding discontinued operations. The division's contribution to Jacob...
December 3, 2012

chemistry
Urbium (Ur) is an upscale element found in big cities. Its oxide (UrO2) is not very stable and decomposes readily at temperatures exceeding 66∘ C. The figure below shows how the rate of reaction varies with the concentration of UrO2 at 75∘ C. The rate r is in units...
December 1, 2012

chemistry
Normal glucose levels in the blood are from 70 to 110 mg glucose per 100 mL of blood. I the level falls too low, there can be brain damage. If a person has a glucose level of 108 mg/100 mL, what is the total mass of glucose in grams in 5.10L of blood?
November 29, 2012

algebra 1
Two vans leave town at the same time going in opposite directions. one travels at 60 miles/hr. the second travels 30 miles/hr. in how many hours will they be 180 miles apart?
November 28, 2012

chemistry
15.00 ml of NaOH is obtained in an Erlenmeyer flask. Before titrating with .2500 M HCl, the initial volume of acid in a buret is read as 2.08 ml. At the endpoint the final volume of acid in the buret is 25.20 ml. What was the concentration of NaOH?
November 28, 2012

physics
thank you very much!
November 27, 2012

physics
ah thanks, it's 10^3 kg/m^3
November 27, 2012

physics
A box with a volume V = 0.03 m^3 lies at the bottom of a lake whose water has a density of 103 kg/m^3. (a) How much force is required to lift the box, if the mass of the box is 100 kg? (b) How much force is required to lift the box, if the mass of the box is 70 kg?
November 27, 2012

maths
Let A, B and C be the sets such that A ∪ B = A ∪ C and A ∩ B = A ∩ C. Show that B = C.
November 27, 2012

Algebra
Let L= 3x and B = 2x. P = 2L + 2B 73= 2(3x)+2(2x) 73= 6x+4x 73= 10x or x = 73/10 x = 7.3 cm Now, L = 3x= 3(7.3)=21.9 cm and B = 2x= 2(7.3)=14.6 cm
November 27, 2012

math
If the key to Graceland costs $750 today and appreciates in value by 15% in one year, what will it be worth one year from today?
November 26, 2012

math
find first 4 terms of following sequence: a1=-6 abd an=2an-1+3 for n >2
November 26, 2012

math
whats the present value of 850.00 made in 10 years with a discount rate of 12%
November 24, 2012

math
so am i then 150 (1.07)^7%
November 24, 2012

math
ok now the same 8 years at 8% with a deposit of 150.00 can you please show me the calculation
November 24, 2012

square roots
Describe the Number systems used in mathematics with the use of subsets of the real number system.
November 20, 2012

math
if my input numbers are 1,2,3,4,5,6 and my output numbers are 8, 14, ?, 24,28,?...I cannot figure out the rule and the numbers where the question marks should be.
November 14, 2012

math
I am trying to figure out an input/output problem: Input Output 1 8 2 14 3 - - 24 - 28 6 -
November 14, 2012

pre-algebra
write 16/19 in decimal notation
November 13, 2012

Math
Ricky wrote the following to show that his sister's age is 6 yrs. less than 3 times his age. Explain what he did wrong. Give the correct expression Let a stand for my age My sister's age a/3-6
November 12, 2012

Stattistics
In one elementary school, 200 students are tested on the subject of Math and English. The table below shows the mean and standard deviation for each subject. Mean SD Math 67 9.58 English 78 12.45 One student’s Math score was 70 and the same individual’s English score...
November 11, 2012

chemistry
balanced equation for potassium nitrate(s)--->potassium nitrate(s)+oxygen(g)
November 8, 2012

Chemistry
If 0.10 mg Fe is diluted in a 50 mL flask, what is the concentration of the resulting solution? What volume of the resulting solution is needed to prepare 25.0 mL of a dilute sample solution with a concentration of 0.30 ppm Fe?
November 8, 2012

College Math
i'm having trouble calculating this. can someone help please? A $7,000, 4%, 120-day note, dated March 20, is discounted on July 15. Assuming a 3% discount rate, the bank discount is: a) $1.74 b) $1.77 c) $7.11 d) $17.68 e) None of these .
November 8, 2012

Valencia
2.0L of a 2.0M HCl solution is added to water so that the final volume is 6.0L
November 6, 2012

Science- chemistry
After extraction with bicarbonate in which layer is the benzoic acid?
November 6, 2012

chemistry
what mass of silver bromide will form when 25.00 mL of a 0.0675 M MgBr2 solution is combined with mL of 0.100 M AgNO3?
October 30, 2012

MATH
FAITH HAS A TRIANGULAR SANDWICH AND ONE SIDE THAT IS 4IN LONG AND ANOTHER SIDE IS 3 IN WHAT IS THE RANGE OF THE THIRD SIDE
October 30, 2012

management science
Kim Davis has decided to purchase a cellular phone, but she is unsure about which rate plan to select. The "regular" plan charges a fixed fee of $55 per month for 1,000 minutes of airtime plus $0.33 per minute for any time over 1,000 minutes. The "executive"...
October 27, 2012

chemisty
a 10.00ml diluted chloride sample required 44.89 ml of 0.01982 m abno3 to reach the fajans end point. how many moles of cl ion were present in the sample
October 25, 2012

Physics
Never mind. (30)(50)(cosine 53degrees) (1500)(.6) 900J
October 23, 2012

Physics
Push a loaded grocery cart by a distance of 50m exerting horizontal force of 30N on the cart at an angle of 53degrees, how much work would you do on the cart?
October 23, 2012

Physics
How much work did the movers do horizontally pushing a 160-kg crate 10.3m across a rough floor without acceleration, if the coefficient of friction was 0.50?
October 23, 2012

business law
The initials "L.S." at the end of a document mean?
October 19, 2012

phyiscal chemistry
Moving from solid to liquid by changing the pressure, so what happend if u decrease the pressure on a solid at constant temperature?
October 18, 2012

bus 115
How is the Web affecting the way business is conducted? Are there changes
October 16, 2012

math
jill bought 32 orange and apple slices. There were three times as many orange slices as there were apple slices. how many of each did she have
October 15, 2012

history
The capital of the Southern Song Empire was the city of Kaifeng Beijing X'ian Hangzhou Shanghai I think its Hangzhou but any help would be greatly appreciated!
October 11, 2012

Statistics
The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between $15 and 30 per share. What is the probability that the stock price will be: (a) More than $24? (Round your answer to 4 decimal places.) Probability (b) Less than or equal to $17? (...
October 10, 2012

Astrophysics
Star Power and Temperature Star A and Star B Consider two stars that are the same size (they have the same diameter), but have different surface temperatures. Let’s say Star A’s temperature is 3000 K and Star B’s temperature is 4500 K. Let’s look at the ...
October 9, 2012

calculus
Let f be the function defined by f(x)= sqrt(x), 0 <or= x <or= 4. and f(x)= 6-x, 4 < x <or= 6 a. Is f continuous at x=4? justify. b. Find the average rate of change of f(x) on the closed interval [0,6]. c. suppose the function g(x)= k sqrt(x), 0 <or= x <or= 4...
October 8, 2012

Public Administration
Explain the budget system model, its consistency with democratic theory, and the importance of data measures.
October 7, 2012

business
What data and stats do you need to know in order to identify profitable nations in which to export.
October 5, 2012

Math
Perry draws two planes, K and L, as shown. Which statement is true? Plane K and plane L contain four lines because a theorem states that a line extends on both sides of a plane. Plane K and plane L intersect along a line because a postulate states that if two planes intersect...
October 2, 2012

ashford university
At which stage of the process of film production does editing primarily take place
October 2, 2012

3rd Grade Math
There are 25 students in Mrs. Roberts 3rd grade class. There are 9 more boys than girls in the class. How many boys and girls are in Mrs. Robert's class? How can I explain this to my 8yr old in 3rd grade? I've got myself so confused in the process of trying to figure ...
October 2, 2012

math
Math word problem: There are 25 students in Mrs. Roberts 3rd grade class. There are 9 more boys than girls in the class. How many boys and girls are in Mrs. Robert's class.
October 2, 2012

probability
Thank you so much for taking the time to help me.
October 1, 2012

probability
in a health study, 18% of americans are underweight. If 4 americans are randomly selected, what is the probability that at least one will be underweight?
October 1, 2012

math
prime factorazation of 34
October 1, 2012

earth science
How do astronomers use satellites?
September 30, 2012

fortis
north island federal credit union pay 4% annual interest, compounded daily on time savings deposits. find the value after 1 year of 750 deposited in this account
September 27, 2012

math - Quadratic Factor
how to you factor -4x^2
September 27, 2012

Chemistry 011
what does Molar Mass mean?
September 26, 2012

Economic
Which economic term describes a service with a price elasticity of demand of 0.25?
September 26, 2012

Economic
It is true when industries that cannot easily alter production levels have inelastic supply? thanks,
September 26, 2012

Economic
Who controls what is sold in a free enterprise system? it is Producers Government or Consumers
September 26, 2012

6th grade math
in a pet store, 1/6 of the puppies are black and 1/4 are white. what fraction of the puppies are black or white?
September 26, 2012

ENG095
Explain what is wrong with the following sentence and make any corrections if necessary: “Neither the mouse nor the rats could find its way through the maze.”
September 25, 2012

early childhood literacy
when children do print alphabet letters,among the easiest to print are:
September 24, 2012

early childhood literacy
1.preschoolers use private speech to: 2.words are: 3.is gluing a writing skill: 4.is cutting a writing skill: 5.the first language arts skill that c hildren learn is: 6.what are words: 7.let me in said the pin.this is an example of: mr. rogers wants to improve his story ...
September 24, 2012

math 116
week 5: self check answers
September 24, 2012

english
Identify which one of the following sentences is missing punctuation. Please correct the error and explain why the correction is necessary. a. I woke up when the book slipped from my lap and landed on my foot. b. After the book slid from my lap and landed on my foot I realized...
September 24, 2012

arithmetic
f(x)=x^2+4x+3=
September 23, 2012

Geometry
can it be rs for the answer or what and this what i need help on this If AB = 6, ST = 8, AC = 12, A = 40°, T = 20°, then find the length of RS. please and thank u.
September 23, 2012

Chemistry
How many hydrogen bonds can an ethanol molecule form to neighboring water molecules ? Why?
September 21, 2012

Physics
With what speed relative to the rocks does the clam smash into the rocks? and With what speed relative to the gull does the clam smash into the rocks?
September 20, 2012

physics
Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 115 km/h north and the VW is traveling at 54.0 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11.6 km. ...
September 20, 2012

Physics
A gull is flying horizontally 8.17 m above the ground at 6.35 m/s. The bird is carrying a clam in its beak and plans to crack the clamshell by dropping it on some rocks below. Ignoring air resistance, what is the horizontal distance to the rocks at the moment that the gull ...
September 20, 2012

Chemistry
If 2579 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km2.
September 17, 2012

algebra 2
ax+bx=c solve for x
September 15, 2012

algebra 2
m=2p+2q solve for p
September 15, 2012

chemistry
0.27
September 14, 2012

Integrated Marketing Communications
Research any firm local or foreign and present a report and critique of their marketing communications
September 14, 2012

curriculum development
Language ability milestone for average young children include singing short rhymes or song at age____ and carrying on a conversation with other children or familiar grown-ups at age __. A 1;4 B.21/2;4 C.3;4 D.21/2;5 I chosed D
September 12, 2012

curriculum development
ok my answer is C
September 12, 2012

curriculum development
Katie is two years old. it is probable that she can: A. flex her leg and kick a ball. B. push against the ball,but not really kick it. C. kick a ball with a straight leg. D. kick a ball with her leg and have arm opposition. I chosed A
September 12, 2012

guidance and discipline
When Cary is not chosen to collect forks in the cafeteria, he shouts I hate you!" to his teacher, Mrs. Miller. Which on of the following responses below will help Mrs. Miller gude carey in expressing his feelings better? A. It sounds like you are really angry with me.B. I...
September 12, 2012

guidance and discipline
An appropriate related consequence for spilling milk is A.n appropriate related consequence for spilling milk is A. being sent to time out. B. replacing the milk C.wiping up the milk. D not getting milk the next day. I picked C ;
September 12, 2012

geometry
A 30-foot cable is suspended between the tops of two 20-foot poles on level ground. The lowest point of the cable is 5 feet above the ground. What is the distance between the two poles?
September 12, 2012

English
No the answers are not correct. 4. Is D Not C To call me on Saturday. I'm 100 and 50 million percent sure.
September 12, 2012

Physics
The left ventricle of the heart accelerates blood from rest to a velocity of +21.4 cm. A. If the displacement of the blood during the acceleration is +1.55 cm, determine its acceleration (in cm/s2). B. how much time does the blood take to reach its final velocity?
September 11, 2012

English
I dont really understand what this quote means ? "Fiction must stick to facts and the truer the facts the better the fiction.”
September 9, 2012

math
What is 75% of 12
September 5, 2012

Math
heheheeheheeheheheeh
September 5, 2012

lang arts
1. D 2. A 3. A 4. B 5. A
September 5, 2012

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