Questions Asked on
September 21, 2013

Chemistry
Consider the following reaction: 2Fe2O3 > 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a. the release of 150 kJ of heat b. the release of 12000 kJ of heat c. the absorption of 12000 kJ of heat d. the absorption of 150
asked by Anonymous 
Chemistry
The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) > SnCl4(l) ΔH°rxn = 511.3 kJ/mol
asked by Anonymous 
college physics
A rod 14.0 cm long is uniformly charged and has a total charge of 20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
asked by vishal 
Science
Family Smith is interested in buying a solar energy system. After some search on internet they have found two different systems that they are considering. System A is a PV system based on multicrystalline silicon solar cells and System B is a PV system
asked by Anonymous 
Chemistry stoch1
Calculate mass of iron, which will be converted into (Fe3O4) by the action of 18g of steam on it.
asked by Aman 
math
A researcher was interested in the emotional effects of music on exam performance. Before their exam, a professor took one group of students into a room in which calming music was played. A different group of students were taken to another room in which
asked by Rachael 
Algebra Answer Check
Which property is illustrated by the following statement? 2x(6) = (6)2x a. Associative Property of Addition b. Commutative Property of Multiplication (?) c. Inverse Property of Multiplication d. Commutative Property of Addition Which property is
asked by Anonymous 
math
in triangle ABC, AB=6, BC=12 AND AC=X. Which of the following cannot be a value of x? a. 6 b.7 c.8 d.9 e.10
asked by Carl 
Chemistry
What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O
asked by James 
chem
Assume that you have 1.41mol of H2 and 3.50mol of N2. How many grams of ammonia (NH3) can you make, and how many grams of which reactant will be left over? 3H2+N2→2NH3
asked by sue 
chemistry
The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side to span a distance of 4.90 mm?
asked by sabrina 
Algebra
Which property is illustrated by the following statement? (7p)mn = 7p(mn) a. Commutative Property of Multiplication b. Associative Property of Multiplication(?) c. Inverse Property of Multiplication d. Commutative Property of Addition What is the
asked by Anonymous 
Math
An elevator moves at a rate of 5.8 feet per second from a height of 300 feet above the ground. It takes 3 seconds for the elevator to make its first stop. How many feet above the ground is the elevator now?
asked by Alicia 
Algebra
The perimeter of a basketball court is 108 meters and the length is 6 meters longer than twice the width. what are the length and the width?
asked by John 
business math
What is the maturity value of the following loan? Use MV = P(1 + RT) to find the maturity. Principal Rate (%) Time Maturity Value $120,740 11¾ % 7 months (Points : 3)
asked by Badgirl444 
Geography (Ms. Sue)
1). What Caribbean island is rich in natural gas, and what impact has this land on the economy? 2). What is the dominant vegetation of the Amazon river basin? 3). What is the main disadvantage of the slashandburn method of growing crops? 4). What is the
asked by Anonymous 
college physics
(a) Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one
asked by vishal 
Chemistry
An element with the symbol Z has the electron configuration 2.8.6. Which species is this elrment most likely to form? A. The ion Z 2+ B. The ion Z 6+ C. The compound H subscript 2 Z D. The compound Z subscript 6 F Which ionization requires the most energy?
asked by Anonymous 
Algebra Answer Check
What is the algebraic expression for the following word phrase: the quotient of 6 and the sum of 5 and y? 6 a.  5y 6 b.  (?) 5+y c. 6(5+y) d. 6/5 + 6y What is the algebraic expression for the following word phrase: the quotient of j and 8? a.
asked by Anonymous 
Physics
You are given three vectors. A = 45.6 at θ1 = 51.2° above the +x axis, B = 23.6 at θ2 = 32.8° above the −x axis, and C = 34.0 along the −y axis. Determine A  B + C (magnitude and angle from the positive x axis).
asked by Craig Thompson 
Physics
You are given three vectors. A = 45.6 at θ1 = 51.2° above the +x axis, B = 23.6 at θ2 = 32.8° above the −x axis, and C = 34.0 along the −y axis. Determine A  B + C (magnitude and angle from the positive x axis).
asked by Craig Thompson 
Chemistry
An unknown compound contains only C, H, and O. Combustion of 4.50 g of this compound produced 10.2 g of CO2 and 4.19 g of H2O. What is this empirical formula of the unknown compound?
asked by Casey 
math
a local summer baseball team plays 20 games each season. so far, they have won 9 games and lost 2. how many more games must they play win this season to win at least 75% of all their games?
asked by kris 
MathGeometry
Angle AOB=x+3, Angle AOC=2x+11, Angle BOC=4x7. Solve for x.
asked by Christa 
Algebra
Order the following numbers from least to greatest. √5, 0.1, (5/3), 0.7, √2 a. 0.7, √2, (5/3), √5, 0.1 b. √5, √2, 0.7, (5/3), 0.1 c. (5/3), 0.1, 0.7, √2, √5 ? d. 0.1, 0.7, √2, √5, (5/3) To which subsets of real numbers does
asked by Anonymous 
Chemistry
A sample of 2.08 grams of Z is dissolved into 500 grams of water which is in a styrofoam coﬀee cup. The temperature is monitored and is found to rise from 25.682◦C to 25.899◦C. What is ∆Hsolution for substance Z? Assume no heat is lost/gained by
asked by John 
Algebra Answer Check
What is the simplified form of the following expression? 7m^2 + 6.5n  4n + 2.5m^2  n a. 9.5m^2 + 1.5n (?) b. 4.5m^2 + 1.5n c. 1.5m^2  4.2n d. 9.5m^2  1.5n Simplify the following expression. 1/3(21m + 27) a. 7m + 27 b. 7m + 9 (?) c. 63m + 9 d. 7m + 81
asked by Anonymous 
Chemistry.........
Elemental chlorine exists as a diatomic molecule Cl2. Chlorine atoms exist in two different isotopes 35Cl and 37Cl. In the mass spectrum of chlorine molecules, how may peaks due to chlorine atoms would be observed? 2 how many different peaks due to the
asked by Anonymous 
chemistry
Butane gas, C4H10(g), is commonly used as a fuel in barbeque gas cylinders. Write a balanced chemical equation for the combustion of butane gas
asked by jeannet 
body system
a 63 year old man has become progressively hard of hearing. hes a retired airplane maechanic. what kind of hearing loss is this man most likely to have
asked by Anonymous 
Accounting 1
The total revenue of the month of June amounted to $6,500; total expenses amounted to $3,500; and withdrawals amounted to $600. The net income for the month amounted to $6,000. $2,400. $3,000. $3,500.
asked by Tee 
Math
Which sum or difference is equivalent to the following expression? 53x  5 Is this 1  3x/5?
asked by Anonymous 
Business Math
What is the maturity date of Samantha Best’s loan?
asked by Anonymous 
physics
The initial speed of a cannonball is 520 m/s. The acceleration of gravity is 9.8 m/s 2 . The cannon and target are at the same elevation. If the ball is to strike a target that is at a horizontal distance of 2.7 km from the cannon, what is the minimum time
asked by Anonymous 
Math  Finance
Product A This product will take 2 years to develop, at a cost of $100,000 in the first year (Yr 0) and $50,000 in the second. Revenue (benefits) in subsequent years is expected to be $100,000 per year. Product B This product will only take a year (Yr 0)
asked by gboy Help please 
Physics
You are given three vectors. A = 45.6 at θ1 = 51.2° above the +x axis, B = 23.6 at θ2 = 32.8° above the −x axis, and C = 34.0 along the −y axis. Determine A  B + C (magnitude and angle from the positive x axis).
asked by Craig Thompson 
physics
A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.3 s later it is rising at a speed of 18 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.4 s after the launch.
asked by girl 
algebra
Thank for the answer to the problem: the perimeter of a basketball court is 108 meters and length is 6 mters longer than twice the width. You gave me the width, but not the length. What is the length?
asked by John 
Algebra
Two cyclists leave towns apart at the same time and travel toward each other. One cyclist travels slower than the other. If they meet in hours, what is the rate of each cyclist?
asked by Mackenzie 
business maths
according to business week magazine,in 2003 there were 3.8 million millionaireup 15% from 2002.how many million millionaire were there in 2002?round to nearest tenth.
asked by Anonymous 
Math
Is this statement true? The least squares regression line is a unique line for each data set? I would say yes.
asked by John 
Math
Using the formula r = d/t, where d is the distance in miles, r is the rate, and t is the time in hours, at which rate must you travel to cover 212.5 miles in 2.5 hours? a 71 mph b 106 mph c 150 mph d 85 mph ? What is the simplified form of the
asked by Anonymous 
math
How do you simplify (x^10)  1 / (x  1)?
asked by Renae 
Biology
Enantiomers, like Lalanine and Dalanine, are so similar that ribosomes will incorporate either one into a protein during synthesis. True or False?
asked by Liam 
Math
Please, help me with this problem. 200=25p
asked by Anonymous 
math
3+2(1+X)>4
asked by kpop 
math
613y
asked by Maisie 
Early Childhood Education
A needs and services plan is a. written by a pediatrician b. only for infants and toddlers with special needs c.a plan discussed by parents and caregivers upon entry into an infanttoddler program d. a formal plan to serve children that is made by the
asked by Sasha 
chemistry
A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16 meV of energy. What is the size of the box? Please report your answer in nm.
asked by sam 
Surveying
I am looking for horizontal distance between 2 points. My slope distance is 153.97' and a vertical distance of 91degrees 32minutes 45seconds.
asked by Dean 
Algebra
Two cyclists leave towns apart at the same time and travel toward each other. One cyclist travels slower than the other. If they meet in hours, what is the rate of each cyclist?
asked by Mackenzie 
Early Childhood Education
Which of the following should not account for rapid gain in overall brain size after birth. a. number of neurons b.swelling due to rapid muscle growth c. The growth of dendrite trees d. myelinization I chose answer a.
asked by Sasha 
Physics
Bob rides his bicycle on a bike path that is 75 kilometers long to get to his house that is due east of the bike path. If it takes Bob 15 hours then what is his velocity?
asked by TJ 
physics
A curving freeway exit has a radius of 50.5m m and a posted speed limit of 35 mi/h \rm mi/h. What is the radical acceleration (in m/s^2) if you take the exit as posted speed express answer to two significant figures and appropriate units. Thanks for any
asked by deb 
MATH
what is the value of any power with exponent zero?
asked by Anonymous 
science
A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16 meV of energy. What is the size of the box? Please report your answer in nm.
asked by Urgent please 
MathAlgebra
The table shows the amount earned for washing cars. How much is earned for washing 25 cars? 3 cars=$13.50, 6 cars=$27, 9 cars=$40.50, and 12 cars=$54
asked by Christa 
Physics
I need help. Resistor 1: Watts=? Current=? Resistance=520 Volts=? Resistor 2: Watts=? Current=? Resistance=? Volts=57.5 Resistor 3: Watts=? Current=? Resistance=1200 Volts=? Total: Watts=? Current=? Resistance=? Volts=280 Find Resistor 2's resistance.
asked by Anonymous 
Chemistry
A1g sample of enriched water, a mixture of H2O AND D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL, sample of the 1 L solution was reacted with excess
asked by Anirudh 
geometry
two angles, a and b are complementary if the sum of their measure is 90 degrees. If angle a is 21 degrees more than twice angle b find the measures of angles a and b. I would like to know how to set this equation up in order to find the answer.
asked by Chrissy 
Subtracting fractions
Can someone help me subtract factions I don't know how to borrow. 12 1/3  7 2/5 LCD=15 So, 1/3 • 5/5 & 7/5 • 3/3 = 5/15  21/15 And then I have no idea what to do
asked by Lilly 
Chemistry
Please help! I have spent hours trying to work these three problems. How many grams of solid barium sulfate form when 27.1 mL of 0.160 M barium chloride reacts with 53.4 mL of 0.065 M sodium sulfate? Aqueous sodium chloride forms also. I have converted the
asked by Anonymous 
Math
Write an equation for the line of the given point and perpendicular to the given line. Please help (5,4);2x+9y=4
asked by Pam 
Geography
In which direction does the Amazon River and its tributaries flow?
asked by Anonymous 
Geography (Ms. Sue)
What countries are drained by the Amazon and its tributaries? My answer: Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela are drained by the Amazon and its tributaries.
asked by Anonymous 
history
why im optimistic about our nations future can you help me i need to write a essay about this paragraph
asked by juan 
Math
What's the equation of the line containing the given point and perpendicular to the given line. (5,3);6x+5y=7 Also (4,5);6x+y=4. In the forms of y=mx+b Thank you for your help.
asked by Pam 
English
1. Pour yourself another cup of tea. 2. Pour another cup of tea. (Are both grammatical? What is the function of 'yourself' in Sentence 1?)
asked by rfvv 
Math (College Level Mathematics)
Fourier cosine series correspondence for f(x)= x, o < x < pie given by x ~ pie / 2  4/n, E infinity on top and n=1 on bottom. cos (an1)/x / (2n1)squared, (0 < x < Pie). Explain why this correspondence is actually an equality for 0 is less than or equal
asked by Joy 
Math (College Level Mathematics)
Fourier sin series for f(x) = 1, 0 < x < Pie is given by 1 = 4/n E 1/ (2n1) times sin (2n1) x, (0 < x < n). Using this, find the Fourier sinc series for f(x)= 1, on 0 < x < c where c > 0. Then find the Fourier series for g(x), x > 0 where g(x) = 1, 0 < x
asked by Joy 
a
can someone help me with steps 0>x^2 +5x2
asked by Alaska Diamond 
Math
The population of New York doubles during the workday. At the end of the workday, the population decreases by half. If the population in New York City is roughly 4,000,000 people before rush hour, and the morning rush hour lasts 3 hours, what would be the
asked by Jessica 
algebra
I need to find the first five terms in the arithmetic sequence in an =(2)^n1 n=1 I don't know now to type the n's smaller.
asked by Alaska Diamond 
Math
A computer depreciates (loses its value) at a rate of 50% the original value every 2 years. If the computer now costs $75 after 6 years, how much did it cost when you bought it new?
asked by Anonymous 
algebra
I have to find the solution for (fg)(x) f(x)= 6x1 g(x)=4x^2 can you show steps please
asked by Alaska Diamond 
Math
A new car depreciates as soon as you drive it out of the parking lot. A certain car depreciates to half its original value in 4 years. IF you bought a car 8 years ago, and it's now worth $5,000, how much did you pay for the car originally?
asked by Anonymous 
algebra
A parallelogram is 22 inches long and 14 inches wide. How do you find the height of the parallelogram? How do you find the area of the parallelogram ?
asked by Betty 
Intermediate Algebra
y/11=3
asked by Brittany 
Cell Biology
Suppose 1.00 ml of blood from a given donor contained 5 X 106 red blood cells and the donor’s hematocrit were 48%. Determine the surface area that the lipids extracted from the plasma membranes of red blood cells obtained from 10.0 ml blood would occupy
asked by Cristian 
college physics
In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.542 multiplied by 1010 m. (The actual value is 0.529 multiplied by 1010 m.) (a) Find the electric force
asked by vishal 
prealgerbra & introductory algebra
22+y=y/14
asked by Brittany 
algebra
Can someone help me with steps showing select approximate value of x that are solutions to f(x)=0 f(x)=7x^2 + 5x + 9
asked by Alaska Diamond 
algebra
22x + 11y +55z =
asked by John 
english
There was no danger, difficulty, or that could ponce de leon from venturing into the jungles of florida to search for the fountain of youth. a= obstructuion...deter b=procrastination... subside i know the definitions its to hard i think its b
asked by someone 
Chemistry
A sample of glucose, C6H12O6, contains 5.1x10623. a.)How many atoms of hydrogen does it contain? b.)How many molecules of glucose does it contain? please help me. :(
asked by Rad 
Chemistry
A sample of glucose, C6H12O6, contains 5.1x10623. a.)How many atoms of hydrogen does it contain? b.)How many molecules of glucose does it contain? please help me. :(
asked by Rad 
PURE MATHEMATICS
5) find the complex number z and w such that z+w=4+3i and ziw=32i
asked by Queenie 
Bus/475
why should core values remain relatively constant.
asked by Anita 
triangles (math)
BO and CO are respectively the bisector of angle b and angle c triangle ABC.AO produced meets BC at P, then find AB/AC.
asked by help(in much need)!!!!!!!!!!!!!!!!!!!! 
ENGLISH (ESL)
please need proof Reading Health promotion means what you can do to reduce the health risks and promote the wellness of a human being. This process directed towards enabling people to take action and support them in changing their lifestyle to move toward
asked by shan 
math
Order: Furosemide 40mg IV push every 12 hours x 3 days. have 50 mg dont clue how to do this .
asked by Anonymous 
English
what is the Past Present and future for carry
asked by bonita 
socials
An extension to my other question how did oliver cromwell like impact the world and why was he significant? It could relate to if he had high moral principles. I wrote my essay but I don't know how to close it up.
asked by bethany 
polynomials
can someone please help me with this problem I have to get the sum diff and product I keep trying to work it out but i really think im blowing it. x^3 ¡¼2x¡½^2 + 3x1 ¡Ã x^2 x+4
asked by Rick 
Chemistry
When electrons get excited can they only move up one level or can they go up multiple orbitals, but just one at a time.
asked by Serena 
physics
Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.16 m. The stones are thrown with the same speed of 8.67 m/s. Find the location (above
asked by Jay 
Algebra
Is 7 + 9 = 9 + 7 true, false, or open? a. true b. false (this one?) c. open Is 4x  3 = 19 true, false, or open? a. true b. false c. open (this one?) Which of the following is a solution to the equation 16 = 4x  4? a. 5 b. 4 c. 5 (this one?) d. 16
asked by Anonymous 
polynomials help me please
Im sorry here is the problem rewritten X^3 2x^3 + 3x1 : X^2x+4 I have to get the sum diff and product and it kicking my tail i think i keep doing it wrong can someone please help me
asked by Rick 
math
The variable n represents a whole number. a. For what values of n will the sum of n+3 be less than 50? b. For what values of n will the product 3n be less than 50?
asked by Shohanur 
leadership
An important factor of being judged a best company to work for is the input provided by company employess.
asked by rachel 
statistics
if a toaster ovens hav an average life expectancy of 9.5 years with a standard deviation of 4.75 years. what is the probability that a toaster oven will last twenty years or will fail in one year or less?
asked by efe 
Englsih
Please edit this writing. There are several errors in this writing. People take out oil from the sands in AB so we can drive and leave tailings ponds. This caused a lot of damage to the land and negative impacts to wildlife. Natives get sick from eating
asked by Dory 
English
Please edit this writing. There are several errors. Also, evaluate the writing, style, spelling and content of this writing piece. The Alberta oil sands are being developed at an unprecedented rate for oil extraction. Consequently there is a great deal of
asked by Jarry 
English
Please evaluate the writing, grammar, style, spelling as well as content. People take out oil from the sands in AB so we can drive and leave tailings ponds. This caused a lot of damage to the land and negative impacts to wildlife. Natives get sick from
asked by Sandy 
statistics
if anxiety scores were recorded as Z score or 1.10, is that higher than 35 in the current study?
asked by efe 
math
If f (x,y)= xy+3, What is f (f (6,4), 2)? A. 12 B. 11 C. 6 D. 3 E. 2
asked by fran 
Chemistry
What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10
asked by ss01 
Chemistry
Calculate the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7.
asked by ss01 
Math
In a certain Library, there are r bookcases with s shelves in each book case. If a total of b books is to be distributed among the shelves, What is the number of books per shelf? a) b/rs b) rb/s c) rsb d) r/sb e) b/sr
asked by David 
Statistics
2. A researcher hypothesized that the pulse rates of longdistance athletes differ from those of other athletes. He believed that the runners’ pulses would be slower. He obtained a random sample of 10 longdistance runners. He measured their resting
asked by Carol 
Algebra
Two cyclists leave towns apart at the same time and travel toward each other. One cyclist travels slower than the other. If they meet in hours, what is the rate of each cyclist?
asked by Mackenzie 
math
The average of 20,70 and x is 40. If the average of 20,70, x and y is 50, then y= a. 30 b. 60 c. 70 d. 80 e. 100
asked by Carl 
Physics
A runner is jogging at a steady 2.7 km/hr. When the runner is 7.7 km from the finish line, a bird begins flying from the runner to the finish line at 5.4 km/hr (2 times as fast as the runner). When the bird reaches the finish line, it turns around and
asked by Theresa 
Math
A 10foot fence was set 2 5/6 feet into the ground. What is the exact length of the fence above ground?
asked by Anonymous