# Questions Asked onOctober 4, 2011

1. ## chemistry

calculate the number of gram of Al2S3 which can be prepared by the reaction of 20 gram of Al and 30 gram of sulpher . how much the non limiting reactant is in excess?

2. ## Stoichiometry

For each precipitation reaction, calculate how many grams of the first reactant are necessary to completely react with 17.3 g of the second reactant. 2KI(aq) + Pb(NO3)2(aq)--->PbI2(s) + 2KNO3(aq) Not looking for the answer I really want to know if I did it

3. ## Stoichiometry

Find the limiting reactant for the initial quantities of reactants 2k(s) + Cl2(g)--> 2KCl(s) 1.8 mol K; 1 mol Cl2 I'm lost

4. ## Calculus

A square is inscribed in a circle. If the area of the circle is 144(pi)cm*squared* --sorry the square root thing isnt showing up. Then the exact perimeter of the square is... I really don't get how to solve this, but the answer is supposed to somehow be

5. ## pysics

A projectile of mass 0.777 kg is shot from a cannon, at height 6.6 m, as shown in the ﬁgure, with an initial velocity vi having a horizontal component of 7.8m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and

6. ## chemistry

How many moles of carbon, hydrogen, and oxygen are present in a 100g sample of ascorbic acid?

7. ## Stoichiometry

Consider the reaction between reactants S & O2 2S(s) + 3 O2(g) ==> 2 SO3(g) If a reactant vessel initially contains 5 mol S and 9 mol O2, how many moles of S, O2 and SO3 will be in the reaction vessel once the reactants have reached as much as possible?

8. ## physics

You head downstream on a river in a canoe. You can paddle at 5.2 km/h and the river is flowing at 2.2 km/h. How far downstream will you be in 30 minutes?

9. ## Chemistry

Which of the subshells in the electron configuration of Hf behave as core orbitals Check all that apply 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d

10. ## Chemistry

Write the correct symbol in standard form for the isotope of platinum that contains 118 neutrons.

11. ## math

A movie theater runs two films continuously. One film runs for 85 minutes and a second film runs for 100 minutes. Both movies begin at noon. When will the two films start again at the same time?

12. ## Physics

A stone is thrown horizontally at 30.0m/s from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2s intervals for the first 10.0 s.

13. ## Math

Write the fact family for 3, 9, , and 12.

14. ## Physics

In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 3.5 m away. After a running start, he leaps at an angle of 14 with respect to the flat roof while traveling at a speed of 5.6 m/s. The

15. ## Physics

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0037 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 2.7 102 ft/s,

16. ## calculus

For what values of x does the graph of f(x)=x+2sinx have a horizontal tangent?

17. ## chemistry

Write a balanced chemical equation for the reaction that occurs when the hydrocarbon styrene, {\rm C}_{8}{\rm H}_{8}(l), is combusted in air.

18. ## Government US

2. Which of the following statements best describes the relationship today between government and the economy in the United States? a. The economy is largely self-regulating. b. The government subsidizes economic interests but otherwise leaves them to

19. ## Chemistry

An electron moves with a velocity of 2.5 x 10^8 cm/s. What is its wavelength? (The mass of an electron is 9.109 x 10^-28 g.)

20. ## Just for "Ms.Sue"

Hey, "Ms.Sue". Ms.Sue you have been very helpful. But I keep getting stuck. 5th grade math is a challenge especially after my teachers stroked and we were out of school for almost all of September and no one in my house understands this new math either. I

21. ## math

the arcade has three pinball machines and five video games.If a person wants to play one pinball machine and one video game,how many different combinations of games could that person play?

22. ## Government US

33. Which of the following is correct about environmental policy? a. The national parks are subject to a dual use policy of preservation, recreation and exploitation of the rich natural resources. b. The Environmental Protection Agency was elevated to

23. ## Chemistry

How many milliliters of a 0.66 M HCl solution are needed to react completely with 1.9 g of zinc to form zinc(II) chloride?

24. ## English-Commas,Check

The horse ran down the hill and through the meadow. a. Correct 2. (Points: 2) The restaurant has openings for waitresses bus boys and fry cooks. b. Incorrect 3. (Points: 2) Whenever I hear the opening measure of Beethoven's Fifth Symphony I get goose

25. ## chemistry 12

For the acid-base neutralization reaction of Carbonic acid, H2CO3(aq) and lithium hydroxide, LiOH(aq), write the blanced: a)complete equation b) Ionic equation c) Net ionic equation. ----------------------- i got a) H2CO3(aq) + 2LiOH(aq) = 2H2O(l)

26. ## Calculus

If f(x)=[(x−1)/(1+5x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.

27. ## Math word problem(algebra)

Diana buys 20 apples at x cents each&40 oranges&sells the bags for 20x cents each.Find out the amount that Diana paid for each apple if she obtained a total of RM 24 from selling all the fruits

28. ## chemistry

Will a precipitate form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3

29. ## Lati

What's the accusative case for 1. magna urbs 2. rex fortis 3. navis longa 4. matres laetae 5. omnes puellae

30. ## sport

what are the legal factors and regulatory bodies that influence health and safety in sport thank you.

31. ## chemistry

what would the equation be for: heating of iron III hydroxide crystals --> iron III oxide + water vapor

32. ## physics

the weight of a solid is 80g in air and 50g in liquid of relative density 1.5. calculate the relative density of the solid.

33. ## physics

A 29 kg child, with a 4.5 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the magnitude and direction of the force on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the

34. ## Physics

After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse into a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of earth. (a) Calculate the average

35. ## Econ

The nominal interest rate is 12 percent per year in Canada and 8 percent per year in the United States. Suppose that the real interest rates are equalized in the two countries and that purchasing-power parity holds. A friend proposes a get-rich-quick

36. ## Physics

A rigid tank having a volume of 0.100 m3 contains helium gas at 150 atm. How many balloons can be inflated by opening the valve at the top of the tank? Each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.30 atm.

37. ## Understanding Paragraphs

Read each of the following paragraph and underline the topic sentence. First, language consists of a large number of symbols. The symbols that make up a language are commonly referred to as words. They are the labels that we have assigned to the mental

38. ## chemistry

How many moles of carbon, hydrogen, and oxygen are present in a 100g sample of ascorbic acid?

39. ## Calculus

Find dy/dx by implicit differentiation: x^2-2xy+y^3 = c Thank you!

40. ## English

The horse ran down the hill and through the meadow. Is this correct?

41. ## psychology

In Pavlov's classical conditioning experiments, the neutral stimulus that comes to elicit a conditioned reponse is known as the: A) unconditioned stimulus B) conditioned stimulus C) reinforced stimulus D) unreinforced stimulus I believe the answer is A or

42. ## college chem

Ethanol (C2H5OH) boils at a temperature of 78.3oC. What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 20.0 g sample of ethanol initially at a temperature of 13.6oC. The specific heat of ethanol is approximately

43. ## Chemistry

Silver nitrate (AgNO3) reacts with sodium chloride as indicated by the equation AgNO3 + NaCl ! AgCl + NaNO3 . Howmany grams of NaCl would be required to react with 518 mL of 0.543 M AgNO3 solution? Answer in units of grams

44. ## chemistry

sodium borohydride (NaBH4) is used industrially in many organic syntheses. one way to prepare it is by reacting sodium hydride with gaseous diborone. Assuming an 86.8% yield,how many grams of NaBH4 can be prepared by reacting 7.98g of sodium hydride and

45. ## english

Which of the following sentences uses parallelism effectively? A. The large plant-eating dinosaurs were quite slow, rather stupid, and extremely hungry. B. The Red Sox fans screamed, yelled, and were applauding wildy. C. The report was good because it was

46. ## algebra

There are 50 questions to answer in a triva contest. Each player starts with 100 points. He or she earns ten points for each correct answer but will lose four points for each incorrect answer. Each player must answer all 50 questions. What is the fewest

47. ## mathematics

the london eye in england is the biggest big wheel in the world. It rotates with people on it so that they can get a view of the city of london from high up.there are 32 cabins attached

48. ## Math

Find b such that (8x+1/b)-2=x has a solution set given by {3}. b =

49. ## trig

if cot 17 degrees = 3.2709, find tan 73 degrees

50. ## math

Bethany has 40 apples. Write a subtraction story about the apples that would require regrouping. Then write the answer in a complete sentence.

51. ## Physics

An unmarked police car traveling a constant 80 is passed by a speeder traveling 145 .Precisely 2.50 after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.80 , how much time passes before the police car

52. ## physics

A boat heads directly across a river 39 m wide at 3.9 m/s. The current is flowing downstream at 2.4 m/s. (a) What is the resultant velocity of the boat? m/s (magnitude) ° (direction) (b) How much time does it take the boat to cross the river? s (c) How

53. ## Math

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.

54. ## COMPUTERS-EXCEL 2007

which one of the following formulas accurately describes the meaning of this formula: (A5*B5)+10 A)add 10 to B5 and multiply the resulting value by A5 B)multiply A5 bY B5,then add 10 to the resulting value C)divide B5 into A5,then add 10 to the result D)

55. ## Physics

A spring has a spring constant of 42 N/m. How much work is required to stretch the spring 1.5 cm from its equilibrium position?

56. ## physics

Name Two solid materials having very low linear expansivity ?

57. ## physics

What happens to the size of a hole in a metal plate when the plate is heated / cooled

58. ## Government

The principle of self-government emphasizes majority rule, whereas the principle of liberty emphasizes individual rights. These principles: a. Are universal and the foundation of all legitimate governments. b. Have no real meaning in practice. c. Are not

59. ## Physics

The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 22.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average

60. ## Chemistry

a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. A) 0.16M but i did it again and got 7.2M so i'm very stuck as to the very different answers i got. B)

128. ## MBA – I/ Semester – I math

Differentiate following with respect to x f(x) = (3x^2 – 5ax + a^2)^4

129. ## HARD PHYSICS

A playground is on the flat roof of a city school, 5.7 m above the street below (see figure). The vertical wall of the building is h = 7.10 m high, to form a 1.4-m-high railing around the playground. A ball has fallen to the street below, and a passerby

130. ## Calculus

If f(x)=[x−1/(1+5 x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.

131. ## math

How is dividing a decimal by a whole number the same as dividing a whole number by a whole number? How is it different?

278. ## Physics 1

A mass of 5 kg lies on a frictionless, horizontal floor. A force of 135 Newtons is applied to the mass at an angle above the positive x axis and a force of 14 Newtons is applied to the mass at an angle of 22.8 degrees below the negative x direction (see

310. ## base-ten blocks

think of Marie's model. for what could you trade one of the hundreds?

311. ## Chemistry

A .1360 g sample of a mixture of magnesium and calcium carbonates when treated with HCL evolves 32.25 cm cubed of carbon dioxed measured dry at STP. Calculate the percent of magnesium carbonate in the mixutre.

312. ## chemistry 12

Identify the two conjugate acid-base pairs in each of the following: A) H2PO4^-(aq) + HSO4^-(aq) = H3PO4(aq) + SO4^2-(aq) B) HI(aq) + CN^-(aq) = HCN(aq) + I^-(aq) i got a) H2PO4^- , HSO4^- and SO4^2- b) CN^- and I^- But i don't think that these are right,

313. ## calculus - limits

Does the limit lim 2011t/3-(squareroot)t+9 exist ? t-0

314. ## College Algebra

Which of the following is equivalent to (2x-3)^2=25 ? A) 2x - 3 = 5 B) 2x - 3 = -5 C) 2x - 3 = 5 and 2x - 3 = -5

315. ## statistics

Suppose that the population standard deviation (ó) for a normally distributed standardized achievement test (ACT) is 6. What would the standard error of the sample mean (óxbar) be if we were to draw a random sample of 36 test scores?

316. ## chemistry

The density of a 2.45 M aqueous methanol solution is .976 g/ml. what is the mass of water present in 1.00 liter of this solution

317. ## Chemistry

2. Why is it easier to remove excess acetic acid from the products than excess isopentyl alcohol?

318. ## Word Problems!!!!

Help with the following problems: 1. Leah bought 2 boxes of cookies. She ate 3 and found that she had 21 left. How many cookies were in each box? 2. Arturo built 3 sandcastles with 6 towers each. Paco built 5 sandcastles with 4 towers each. Who built more

319. ## science

The lanthanide metal europium (Eu) forms a crystalline solid with a cubic unit cell of edge length 3.854 Å. The density of europium is 4.408 g cm-3. The crystal structure of solid europium is a. body-centered cubic b. simple cubic c. face-centered cubic

320. ## Writing

Does Feature Writer means a creative writer ?

321. ## MBA – I/ Semester – I math

Differentiate following with respect to x. (3x2 – 5ax + a2)4

322. ## Language Arts

In the sentence....The letter listed gifts for the wedding. Would listed be a physical action verb or a mental action verb?

323. ## social studies

Adonis went to the Industrial Psychologist's office all confused and upset. Apparently, his new supervisor told him to stop making the peace sign in a sideways motion, saying it looked like a gang-related gesture. Most likely, the psychologist advised the

324. ## chemistry -- help

In sugar production, a process involves seeding of a supersaturated solution (sugar as solute) by adding 'ground sugar with few amounts of isopropyl alcohol'. My question is, why must the ground sugar be wetted with isopropyl alcohol? thanks in advance.

325. ## physics

You head downstream on a river in a canoe. You can paddle at 5.2 km/h and the river is flowing at 2.2 km/h. How far downstream will you be in 30 minutes?

326. ## statistics

(Blood Test Problem) Suppose 100 people are waiting for blood test for a kind of disease. The probability that for one person the test result is positive equals 0.1. Two test methods are as follows: Method 1: Test one by one. Then we have to do 100 tests.

327. ## probability and statistics

(Right Triangle Problem) Randomly cut a line segment into three pieces. What is the probability that these three pieces can form a right triangle?

328. ## physics

A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.6 m/s2. (a) If the tension in the cord is 54 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.6 m/s2?

329. ## Quantitative Methods

Read the “JET Copies” Case Problem on pages 678-679 of the text of the Quantitative Methods Book. Using simulation estimate the loss of revenue due to copier breakdown for one year, as follows: 1. In Excel, use a suitable method for generating the

330. ## HCA

Is this the proper order for Alphabetic filing? Norman Bailey-Jones o Norman Bailey Jones o Robert D’Angelo o Robert D. Angelo o Robert DeAngelo o Judith delaCroix o Judith Dela Croix o Franklin M. Haney o Franklin Mac Haney, Jr. o Franklin MacHaney, Jr.

331. ## physics

You head downstream on a river in a canoe. You can paddle at 5.2 km/h and the river is flowing at 2.2 km/h. How far downstream will you be in 30 minutes?

332. ## Physics

We consider the case shown in the figure below. Two objects with masses m and M are connected with a taut string running over a pulley. The pulley rotates without friction. The two masses are given as M = 6.23 kg and m = 2.54 kg. A second taunt string

333. ## math

-7x-(10-x)=58

334. ## Calculus--Reiny

V = Radical The expression: V2(V5-12V3)-V3(V8-2V30) can be written in simplest form aVb-cVd, where a, b, c ,d are all positive integers. The value of a + b + c + d is ________. So after solving all this out, I arrived at 7V10 - 14V6. That - is beside the

Brad filled in 24 out of 40 words on a crossword puzzle. Stewart filled in 15 out of 25 words on a different crossword puzzle. Which correctly compares the fractions of the puzzles that Brad and Stewart completed. a)2/3>3/5 b)3/53/5 d)3/5=3/5

336. ## Pre-Medical

Can someone please tell me what the stndardized employability skills? (Standardized as in used globally)

337. ## physics

How do we compensate for thermal expansion /contraction in the construction of metal pipes for carrying steam?

338. ## arithmetic

Cheri's time in the bobsled race was 1 min, 38.29 sec. What is the word form and the value of the 9 in Cheri's time?

339. ## Chemistry

A 36.0mL sample of 1.20 M KBr and a 56.0mL sample of 0.700 M KBr are mixed. The solution is then heated to evaporate water until the total volume is 60.0mL. What is the molarity of the KBr in the final solution?

340. ## math

Put counter in left cloud

341. ## science

a can potatoes has the following data: recall 4-9system carbs=22 fat is 10 grams and protien is 13 find the percentage of each if the calories = 275

342. ## Calculus

show lim x->3 (sqrt(x)) = (sqrt(c)) hint: 0< |sqrt(x)-sqrt(c)|= (|x-c|)/(sqrt(x)+sqrt(c))

343. ## math

a bird flies due north 2 miles then east 3 miles then north 4 miles then east 5 miles how far is the nest from the ocean