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Questions Asked on September 22, 2013

Consider the following reaction:2Fe2O3 --> 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a.
1. 5 answers
2. asked by Anonymous
3. 26,578 views
The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn.For the following reaction
1. 16 answers
2. asked by Anonymous
3. 10,366 views
I need to make each statement into a question using the interrogative words. Can someone revise the questionsAdónde Cuándo
1. 6 answers
2. asked by Elizabeth
3. 7,601 views
Write a piecewise definition for the tax due T(x) on an income of x dollarsWhen x <= $15,000..... 3% of taxable income When
1. 3 answers
2. asked by Ally
3. 6,025 views
When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained.a. Determine
1. 1 answer
2. asked by James
3. 4,317 views
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,
1. 6 answers
2. asked by Anonymous
3. 3,979 views
Which of the following metals or nonmetalsare expected to displace Mn or Cl (respectively) from MnCl2? 1. Ca should displace Mn.
1. 2 answers
2. asked by John
3. 3,312 views
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
1. 2 answers
2. asked by Anonymous
3. 3,168 views
Acetylsalicylic acid (C9H8O4) is a monoprotic acid commonly known as "aspirin." A typical aspirin tablet, however, contains only
1. 1 answer
2. asked by Anonymous
3. 2,966 views
1). What Caribbean island is rich in natural gas, and what impact has this land on the economy?2). What is the dominant
1. 4 answers
2. asked by Anonymous
3. 2,809 views
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.
1. 7 answers
2. asked by Anonymous
3. 2,696 views
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.45 rad/s2. It accelerates
1. 1 answer
2. asked by Sue
3. 2,635 views
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
1. 1 answer
2. asked by sabrina
3. 2,401 views
In four of the following groups, the threesubstances are either all strong electrolytes, all weak electrolytes, or all
1. 1 answer
2. asked by Claire :)
3. 2,391 views
A car rounds a curve with a radius of 25 m at a speed 30 m/s. What is the centripetal acceleration of the car?
1. 3 answers
2. asked by Alison
3. 1,990 views
what is the name of reaction for 3C2H2--> C6H6?
1. 5 answers
2. asked by hi
3. 1,948 views
The combustion of ethane (C2H6) produces carbon dioxide and steam:2C2H6+702 yields 4CO2 +6H2O How many moles of CO2 are produced
1. 3 answers
2. asked by Mary
3. 1,946 views
A ball is thrown horizontally from the top of a cliff 20m high. If the initial horizontal velocity is 8.0m/s,find how long it
1. 3 answers
2. asked by Abigail
3. 1,921 views
It is a 7-digit numberIt has a digit 0. The greatest digit is in the hundred thousands place. The value of the digit 1 is
1. 2 answers
2. asked by Marsha
3. 1,820 views
Show that the square of an oddnumber is an odd number using a direct proof.
1. 2 answers
2. asked by
3. 1,464 views
Assigment: write a business letter according to the background.Background:Assume that you’ve worked for the last five years as
1. 1 answer
2. asked by Diana
3. 1,425 views
calculate q , w , and ∆ E for melting 1.00 mol of ice at 0 ◦ C and 1.00 atm pressure
1. 2 answers
2. asked by C
3. 1,392 views
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
1. 3 answers
2. asked by Anonymous
3. 1,336 views
Old McDonald has cows and chickens on his farm. If the animals on his farm have a total of 197 heads and 634 legs, how many cows
1. 1 answer
2. asked by Prince
3. 1,327 views
The population of New York doubles during the workday. At the end of the workday, the population decreases by half. If the
1. 1 answer
2. asked by Jessica
3. 1,325 views
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.CaCO3 +2HCl
1. 1 answer
2. asked by Lori
3. 1,301 views
Give an appropriate answer.Let lim x→6 f(x)=81. Find lim x→6 4^√f(x).
1. 6 answers
2. asked by tony
3. 1,266 views
A population of glasswing butterflies exhibits logistic growth. The carrying capacity of the population is 200 butterflies, and
1. 0 answers
2. asked by Anon
3. 1,261 views
Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so,
1. 2 answers
2. asked by Brittney
3. 1,207 views
what is the cost of spraying insecticide on a field measuring 2000m by 3200m if the cost is $22 per hectare.
1. 2 answers
2. asked by leena
3. 1,177 views
In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed
1. 2 answers
2. asked by Q
3. 1,128 views
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
1. 1 answer
2. asked by Anonymous
3. 1,106 views
A vessel containing 39.5 cm3 of helium gas at 25°C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted,
1. 2 answers
2. asked by Hannah
3. 1,103 views
Preschoolers do not use private speech toA) communicate with those around them B) decide what to do C) explain events to
1. 1 answer
2. asked by Lisa
3. 1,098 views
Two cars run at constant speeds around a one-mile racetrack. If the cars circle the track in the same direction, the faster car
1. 1 answer
2. asked by Raz
3. 1,074 views
Find the variance for the set of data: 24, 31, 16, 22,22.
1. 2 answers
2. asked by Marvin
3. 1,026 views
what is the Past Present and future for carry
1. 1 answer
2. asked by bonita
3. 999 views
From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.20 m/s and angle
1. 0 answers
2. asked by Anonymous
3. 996 views
The half life of U238 is 4.5 x 10^9 yr. A sample of rock of 1.6 g produces 29 dis/sec. Assuming all radioactivity is due to U238
1. 1 answer
2. asked by Nancy
3. 971 views
what was the federalist v Democratic-Republicans..Ie. Alexander Hamilton assumed leadership of Federalist cause and Thomas
1. 9 answers
2. asked by Blaze
3. 947 views
A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal
1. 3 answers
2. asked by physics
3. 938 views
Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity
1. 0 answers
2. asked by Katy
3. 867 views
Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is
1. 1 answer
2. asked by Jessica
3. 850 views
It is a 6 dagit number.The least digit is in the thousands place. The greatest digit is in the ones place. The digit in the tens
1. 5 answers
2. asked by Marsha
3. 846 views
If aqueous hydroﬂuoric acid is reacted with sodium hydroxide, which of the following substances are in the net ionic equation?
1. 1 answer
2. asked by Adam
3. 843 views
Simplify and combine the like terms:2f + 7g - 6 + 8g
1. 2 answers
2. asked by needhelp
3. 825 views
1. (defining capital structure weights) templeton extended care facilities, inc. is considering the acquisition of a chain of
1. 0 answers
2. asked by chris
3. 821 views
Assume that the maximum aperture of the human eye, D, is approximately 8 mm and the average wavelength of visible light, λ, is
1. 0 answers
2. asked by vv
3. 819 views
A plane is flying horizontally at a speed of 290m/s. He drops a package (ignoring air resistance).A)If it take 15s for the
1. 1 answer
2. asked by Jason
3. 818 views
The half-life of a certain radioactive isotope is 32 hours.What fraction of the sample would remain after 16
1. 4 answers
2. asked by john
3. 817 views
A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 4.06 m to
1. 1 answer
2. asked by ANGIE
3. 809 views
Provide the products for this reaction: CH3O- +CH3SH -> ????
1. 1 answer
2. asked by Anon.
3. 797 views
Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway
1. 0 answers
2. asked by Sue
3. 753 views
Simplify3*3 to the power root 40 - 4* 3 to the power root 320 - 5 to the power root 5?
1. 2 answers
2. asked by tuhituhi
3. 745 views
factorise ?a(a+b)^2 - 2ab(a+b)
1. 1 answer
2. asked by tuhituhi
3. 734 views
a) Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other.
1. 1 answer
2. asked by vishal
3. 733 views
Co m i c the ears wet eyebrows chicken right=right ieieceiie a l u m i n u m pa r tici ple
1. 1 answer
2. asked by Joe
3. 730 views
A spectral line is emitted when an atom undergoes tranisition between two levels with a difference in energy of 2.4eV.What is
1. 1 answer
2. asked by physics
3. 686 views
A person is willing to pay $50 per visit for physical therapy, but she pays $35 per visit. This person receives a consumer
1. 2 answers
2. asked by Anonymous
3. 671 views
I need some help on this problem:Describe the difference between an open equation and a closed equation. My textbook says that
1. 1 answer
2. asked by Anonymous
3. 667 views
A certain type of ideal gas at pressure p0 is contained in a plugged flask of volume V initially at temperature T1. The
1. 0 answers
2. asked by Anon.
3. 659 views
Linda has a total of 225 on 3 tests. The sum of the scores on the first and second tests exceeds her third score by 61. Her
1. 1 answer
2. asked by Anonymous
3. 658 views
A daredevil is dead set on jumping the Grand Canyon at its narrowest point (180 meters across). He has set up a ramp at 25
1. 1 answer
2. asked by Marty
3. 650 views
Imagine that you are standing on the beach in the picture. Write a paragraph of at least 5 complete sentences using imagery to
1. 1 answer
2. asked by Andrew
3. 630 views
While taking a rest on a tree branch, a daring cowboy sees a wild horse running towards the tree he was on. he wants to land on
1. 1 answer
2. asked by JT
3. 630 views
connect your poem to something in the world, i.e. a song, film, current event, etc. Play the song or just mention the connection
1. 5 answers
2. asked by Laruen
3. 624 views
Two blocks (M1 = 2.57 kg and M2 = 6.71 kg) are in contact on a frictionless, horizontal tabletop. An external force, $\vec{F}$,
1. 0 answers
2. asked by Lyra
3. 620 views
Nico squared some numbers and got these answers.Determine each number she squared, Explain your reasoning.a)49 (its 7)i know
1. 1 answer
2. asked by Saru
3. 618 views
1. the points A (3,5) and B (6,2) are reflected over the y-axis. find the area of the figure formed by joining the points.2.
1. 2 answers
2. asked by Yana
3. 616 views
In this problem, we will carry out some steps of the quantum factoring algorithm for N=21.(a) What is the period k of the
1. 0 answers
2. asked by imath
3. 609 views
Each day, a lion in South Africa spends 1/6 of the day watching gnus and 1/4 hours chasing gnus. Then the lion takes 4 times as
1. 1 answer
2. asked by Prince
3. 605 views
A rifle that has been "sighted in" for a 94.6-meter target. If the muzzle speed of the bullet is v0 = 429 m/s, what are the two
1. 1 answer
2. asked by help please
3. 604 views
what value of m will make 4x-7y=5 and 9x+my=3 parallel?a car leaves town A at 10:00 a.m. and travels at a constant speed of 40
1. 3 answers
2. asked by Riza
3. 603 views
What countries are drained by the Amazon and its tributaries?My answer: Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela
1. 1 answer
2. asked by Anonymous
3. 594 views
Both Greek and Enlightenment philosophers believed that humans __________.
1. 2 answers
2. asked by tyiana
3. 593 views
Which of the following is not a source of caution in regression analysis between two variables?A) non-linear form. B) linear
1. 0 answers
2. asked by Jeremy
3. 591 views
How many sulfate ions are there in 2.500 mL of 5.0 x 10-15 moles of Cr2(SO4)3?
1. 1 answer
2. asked by Zac
3. 587 views
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
1. 0 answers
2. asked by Cristian
3. 586 views
At a butcher shop, 1 pound of beef and 2 pounds of chicken costs 859 cents. 1 pound of beef and 2 pounds of duck costs 951
1. 1 answer
2. asked by Raz
3. 585 views
find the speed of a point on the rim of a 24-cm diameter fly -wheel which is tuning at 2800 revolutions per minute. give your
1. 2 answers
2. asked by leena
3. 578 views
Can someone help me with this question as in don't give me the answer but help me how to start it!I've been stuck on this
1. 3 answers
2. asked by Lilly
3. 573 views
1. The teacher issued a warning to all (procrastinate) that friday would be the last chance to turn in papers.2.The principal
1. 5 answers
2. asked by someone
3. 569 views
On a hot summer day, Sunny bought 18 ice creams for her team members. Some were $7 each, and the others were $10 each. If she
1. 1 answer
2. asked by Glen
3. 564 views
So for Chem we have to answer a question asking why graphing is a more accurate method for measuring density than manually
1. 1 answer
2. asked by Anonymous
3. 558 views
A candle has length 25 cm. Once lit, the candle burns away at a constant rate of 0.6 cm per minute. What is the length of the
1. 2 answers
2. asked by Andre
3. 556 views
A computer depreciates (loses its value) at a rate of 50% the original value every 2 years. If the computer now costs $75 after
1. 1 answer
2. asked by Anonymous
3. 551 views
A swimmer can swim in still water at a speed of 9.42 m/s. He intends to swim directly across a river that has a downstream
1. 1 answer
2. asked by Anonymous
3. 550 views
A train has a mass of 5.27E+6 kg and is moving at 53.9 km/hr. The engineer applies the brakes, which results in a net backward
1. 4 answers
2. asked by Kimmy
3. 549 views
You plan to throw stones by using a sling of length 1.8 m which you whirl over your head. Suppose you wish to throw a stone a
1. 0 answers
2. asked by Sue
3. 549 views
Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top
1. 1 answer
2. asked by Jay
3. 547 views
Calculate the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively.
1. 0 answers
2. asked by walter white
3. 547 views
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's
1. 0 answers
2. asked by Anonymous
3. 542 views
Water flow along horizanta pipe at cross sectional area 48cm which has a constriction at cross sectional area 12cm at one place
1. 0 answers
2. asked by Anonymous
3. 539 views
5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the
1. 1 answer
2. asked by Shaun
3. 538 views
An average American spends 30 minutes a day waiting in a line. They also drive for 5/3 hours, eat for 5 quarters of an hour, and
1. 1 answer
2. asked by Glen
3. 538 views
Find the value of $15,000 at the end of one year if it is invested in an account that has an interest rate of 4.50% and is
1. 1 answer
2. asked by Ally
3. 534 views
which region of the world benefited more from the columbian exchange?
1. 3 answers
2. asked by lena
3. 534 views
is it better to take physics or chemistryif taking both whats better to take 1st in sophomore year better to take ap statistics
1. 1 answer
2. asked by jim
3. 530 views
5 times the least of three consecutive odd numbers is 35 more than twice the sum of the greater two. What is the sum of the
1. 1 answer
2. asked by Shaun
3. 528 views
A daredevil is dead set on jumping the Grand Canyon at its narrowest point (180 meters across). He has set up a ramp at 25
1. 0 answers
2. asked by Marty
3. 528 views

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