Richard

Most popular questions and responses by Richard
1. geometry

What happened when two fruit companies merged?

2. More Organic Chem.

1. Would you expect ibuprofen to be soluble or insoluble in 1.0 M NaOH? Explain. 2. Thymol is very slightly soluble in water and very soluble in 1.0 M NaOH. Explain. Any info. would help! Below are two web pages. The first shows ibuprofen has a -COOH group

3. college physical science

According to table 1.3, what volume of iron would be needed to balance a 1.00cm3 sample of lead on a two pan laboratory balance? Table 1.3 shows densities g/cm3 such as iron=7.87g/cm3 and lead is 11.4g/cm3

4. Physics

What is the value of each of the angles of a triangle whose sides are 95, 150, 190 cm in length? I have tried to do this problem, don't get me wrong, but I don't really know where to go. Can someone tell me how to even approach this problem? The textbook

Hi! is my answer correct? Consider the following chemical reaction: H2 (g) + I2 (g) 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value ofKeq for this reaction is

6. Physics

A bead slides without friction around a loop- the-loop. The bead is released from a height of 12.9 m from the bottom of the loop-the- loop which has a radius 4 m. The acceleration of gravity is 9.8 m/s2 . A 4m 12.9 m What is its speed at point A ? Answer

7. Physics

A uniform metre rule AB us balanced on a knife edge which is 55cm from B. If a mass of 10g is hung at P, which is 10cm from A, calculate the mass of the metre rule. Please HELLLLP URGENTLY!!!!!!😥😥😥😥😥😥😫😫😫😫😫

8. college chem

The cation M2+ reacts with NH3 to form a series of complex ions as follows: M2+ + NH3 M(NH3)2+ K1 = 102 M(NH3)2+ + NH3 M(NH3)2 2+ K2 = 103 M(NH3)2 2+ + NH3 M(NH3)3 2+ K3 = 102 A 1.0 × 10–3 mol sample of M(NO3)2 is added to 1.0 L of 15.0 M NH3 (Kb = 1.8

9. Chem.

If 0.130 g of p-aminophenol is allowed to react with excess acetic anhydride , what is the theoretical yield of acetaminophen in moles? In grams? p-amino. - MW: 109.13g aceta. - MW: 151.16 g ** I just forgot how to do this, I know it's probably REALLY

10. Math

A child's desk is made so that the dimensions are two-thirds the dimensions of a full-size adult desk. Suppose the top of the full-size desk measures 54 inches long by 36 inches wide. What is the perimeter and area of the topof the child's desk?

11. chem class

A 25.00-mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 10.0 mL of KOH is ???? M.

12. Chemistry

Ammonia (NH3) reacts with oxygen to produce nitric oxide (NO) and water (see balanced equation below). How many grams of oxygen do you need to react with 21.4 g ammonia? __4_NH3 + __5_O2 → __4_NO + _6__H2O

13. Lab conclusion- HELP!

I' am currently trying to wrie a couple of lab conclusions and having a hard time coming up with good points to make for the following lab experiment: Thin layer chorotography If anyone has a few minutes to give me a couple tips on how to improve this. I

14. chemistry.

Lithium hydroxide reacts with carbon dioxide as follow. 2LiOH + CO2________ Li2CO3 + H2O What mass (in grams) of Lithium hydroxide is need to react with 11 g of carbon dioxide?

15. Chemistry

Can anyone help me check my classifications of these into metallic, ionic, molecular or covalent network, and if I am wrong tell me why Aluminum - Mettalic Ascorbic acid - ionic Graphite - covalent Paraffin - molecular Palmitic acid - ionic Sodium chloride

16. algebra

A 12 - ft ladder leans against the side of a house. The bottom of the ladder is 6 ft from the side of the house. How high is the top of the ladder from the ground? If necessary, round your answer to the nearest tenth.

17. College Algebra

The sum of three consecutive natural numbers is 966. Find the numbers.

18. college physical science

how much would a 80.0kg person weigh on mars if the acceleration of gravity is 3.93m/s2

19. Physics Lab I

Let's say you measure an average acceleration to be 0.4134 ms-2. What is the height (in centimeters) of the riser block? Assume the legs of the track span 1.0000 m and that there is neither friction nor drag. Also assume the block is under one of the legs.

20. chemistry

1.Use the Vsepr theory to predict and explain the shape and bond angle of each of the molecules SCI2 and C2CL2. 2.Deduce whether or not each molecule is polar, giving a reason for your answer...Any help please??

21. Science

Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location.

22. Physics hard...

Young's Modulus (Y) 20 X 1010 N/m2 Shear Modulus (S) 8.1 X 1010 N/m2 Bulk Modulus (B) 16 X 1010 N/m2 The table to the above represents various properties of steel. You have steel wire 4.9 meters in length that stretches 0.16 cm when subjected to a force of

23. Maths

a map with a scale of 1cm to 5km has an area of 405cmsquare. what is the actual area of this map on the ground?

24. Physics (Thin Film Interference)

A layer of transparent plastic (n=1.61) on glass (n=1.52) looks dark when viewed in reflected light whose wavelength is 589 nanometers in vacuum. Find the two smallest possible nonzero values for the thickness of the layer. Answers are 183 nm and 366 but I

25. chemistry

Calculate the number of moles of FeSO4 in 25cm3 of a 0.2mol dm3 solution

26. Statistics

A politician is preparing to speak to voters in Connecticut. He DOES NOT favor gun control laws. However, a survey of 1200 voters from this state resulted in 984 voters that supported some level of gun control laws. (Assume a good random sample was taken).

27. Physics

a uniform metre rule pivoted at R, the 70cm mark. Two forces 0.1 N and 0.4 N are applied at Q, the 60cm mark and S, the 85cm mark. If the metre rule us kept in equilibrium, by the forces, calculate the weight of the metre rule.

28. physics

a ball projected vertically upwards from the top of the tower 60 meters high with a velocity of 30 meters per second. what is the maximum height above the ground? how long does it take to reach the ground?

29. Chemistry

A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the

30. science(physics)

A piece of copper block of mass 24g at 230 degree celsius is placed in a copper calorimeter of mass 60g containing 54g of water at 31 degree celsius.Assuming heat losses are negligible,calculate the final steady temperature of the mixture (Specific heat

31. Physics

If Galileo and his assistant were 16 km apart, how long would it take light to make the round-trip? How does this time compare with reaction times of about 0.4 s?

32. life orientation

Clealy describe a recent corruption and fraud cases in the country making headlines in the media

33. chemestry

How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

34. Physics

a mercury in glass thermometer reads -20°C at the ice point and 100°C at the steam point. Calculate celcius temperature corresponding to 70°C on the thermometer

35. Physics hard... can't get it right

A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of

36. Physics

A uniform metre rule of mass 90g is pivoted at the 40cm mark. If the rule is in equilibrum with an unknown mass, M placed at the 10cm mark and 72g mass at the 70cm mark, determine M. Please help me urgently!!

37. Trigonometry

If the distance covered by an object in time t is given by s(t) = t^2 + 5t , where s(t) is in meters and t is in seconds, what is the distance covered in the interval between 1 second and 5 seconds?

38. Physics

A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter

39. Physics

A chain composed of four identical links is suspended by a rope and does not move. What are the forces on each chain? (include where they come from)

40. Biology

The density of ice is 916.7 kilograms per cubic meter at 0 degrees Celsius under atmospheric pressure. Columbia Glacier, in Alaska, loses about 4 billion metric tons of ice each year. About what volume of water melts from the glacier each year? Im confused

41. Physics

(PLEASE HELP ME URGENTLY) The electrical resistances of the element in a platinum resistance thermometer at 100°C, 0°C and room temperature are 75.000W, 63.000W and 64.992W respectively. Use these data to determine the room temperature. (PLEASE HELP ME

42. physics

A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of

43. Physical Science

A cubic tank holds 1,000kg of water. What are the dimensions of the tank in meters. Explain your reasoning.

A square made by a length of string 8 cm long is reshaped into a circle. What is the circumference of the circle

45. Physics

What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 6*10^6 m/s?

46. CHEMISTRY

How to prepare a 500ml 0.2M NaOH solution from 2.0M NaOH solution

47. Physics

What is the fundamental frequency for a 62 cm banjo string if the speed of waves on the string is 470 m/s?

48. Probability

Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten

49. physics

A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?

50. math

there are 20 students in mark`s homeroom class. Ten percent of the students in marks homeroom class are also in art class He finds the number of students in his homeroom class who are also in art class like this . Can you tell me the answer of how many

1. ZG Jewelers purchased fashion bracelets for \$38.87. This jewelry store regularly marks up fashion merchandise 52% of the selling price. What is the minimum selling price that ZG Jewelers should charge? 57.20 59.23 80.98 94.94

52. math

There are 40 vehicles in a parking lot. Twenty percent of the vehicles are pickup trucks. How many pickup trucks are in the parking lot?

53. org. chem

why is it easier to remove excess acetic acid from the products than excess isopentyl alcohol? from the products of what? Did you perform an experiment in class and this is one of the lab questions? If so you will need to explain what you did in some

54. chemistry

1.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces. 2. The element sodium, aluminum, silicon, phosphrous, and sulfur are in periods 3 of the periodic table. Decribes the

55. Math - Algebra

An architect is designing a building in the shape of a rectangular pyramid. The number of windows on each floor forms an arithmetic sequence. There are 76 windows on the 7th floor, 68 on the 8th floor, and 4 on the very last floor Find an explicit formula

56. Physics

The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti -node

57. Physics

Having trouble determ the formulas for the follow problems. 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? 60 km 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two

58. Physics

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2

59. Math Help

1.) You have \$22 in your bank account, and you deposit \$11.50 per week. Your cousin has \$218 in his bank account and is withdrawing \$13 per week. The graph of this problem situation intersects at x=8. What does this mean? A. In 8 weeks, you will have

60. chem101

Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.

61. college physical science

how much would a 80.0kg person weigh on earth where the acceleration of gravity is 1.63m/s2

62. Physics - URGENT

A small block of mass 5 kg initially rests on a track at the bottom of a circular, vertical loop-the-loop, which has a radius of 0.8 m. The surface contact between the block and the loop is frictionless. A bullet of mass 0.7 kg strikes the block

63. Organic Chem.

When a tlc plate was developed the solvent front ran off the top of the plate, why? A two component mixture containing a dicarboxylic acid and tricarboxylic acid gave only one spot with an Rf value of 0.05. Solvent used; hexane. What went wrong? Solvent

64. Nouns

Our son's 3rd grade teacher gave out a homework assignment which had the students make a sentence for each of their spelling words and then circle the "noun" in the sentence. We received his homework back from the teacher with the words, "I, you, He",

65. Statistics

A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled

66. Chemistry

A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation

67. Chemistry

A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation

68. English

Reading the book Twilight by Stephenie Meyer. Will have to write book report in class 11/13/07. Has anyone read the book and written a book report on it.

69. Science

A toy rocket of 5.0 kg is launched from rest and reaches a height of 100 M in two seconds. What is the work done by the engine during this non acceleration stage?

70. math

A number is written with the following factorization:2² x 3 x 5⁴ x 8 x 11².Is this factorization a prime factorization? Explain why or why not. If it is not correct, give the correct prime factorization of the number.

71. Marketing

Explanation of leadership without followership is nonesense and impossible in relation to the principles of marketing management..... PLLLLEAAASE ASSIST ME!!!!

72. Chemistry

Thanks to Dr. Bob for answering all these questions! I always do poorly on conceptual problems. Consider the following equilibrium system at 25°C and select the true statement below: H2PO4−(aq) + SO42−(aq) ↔ HSO4−(aq) + HPO42−(aq) ΔG°rxn > 0

73. English

Rewrite the passage below correcting any errors of grammar and usage The mechanic drove out the car to Joe that was lubricated. As a matter of fact, he has not done enough on it as Joe has expected. But whatever it was he decides to take it like that. The

74. Physics

How long is a wavelength of infrasound with a frequency of 4 Hz?

75. Physics

The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest or “ground” state, n=3 is the third state, and so on. If the atom’s diameter is

76. chemistry

.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.

77. chemistry correction

1. Which two elements react vigorously with each other? A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. A: Electronegativity decrease across a

28 x 15 simplify by using distributive property,

79. Chemistry

Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten

80. Intermediate Algebra

Am I going in the right track? 8x -1/x + 5x - 3/2x = 16x^2 - 2x/2x^2 + 5x^2 - 3x/2x^2 16x^2 - 2x + 5x^2 - 3x/2x^2 =21x^2 - 5/2x^2 Find the LCD 6/7z- 28, 8/x^2 -4x = 7x(x-4) Simplify 3x^2 - 2x/15x-10 = x/5 Let's start by looking at your first problem: 8x

81. Maths

14 metres of rope costs €9.52. If Joe bought 21 metres, how much change out of €20.00 do Joe get? Is there a shorter way of doing this other than dividing, multiplying and then subtracting?

Direct verse indirect cost Estep Construction Company is composed of two divisions: (1) Home Construction and (2) Commercial Construction .The Home Construction Division is in the process of building 12 houses and the Commercial Division is working on 3

84. Physics

A Ball Of Mass 0.25kg Losses Half Of Its Velocity When It Makes A Head On Collision With An Identical Ball Q At Rest.After The Collision,Q Moves off with a speed of 2m/s in the original direction of p.calculate the initial velocity of p.

85. Math Help

Hi! I need help with this practice problem. My teacher gave us the answer, "2cot u" BUT she wants us to figure out why that's the correct answer. I'm having some trouble with this and could really use some help. Thank you! Problem: 1+ sec u/tan u - tan

86. science

if a substance is known to enter a cell by diffusion, what effect would raising the temperature have on the cell? Why does it have this effect?

87. Trigonometry

Find all solutions for the following equation in the interval 0 ≤ x

88. Noiuns

Our son's 3rd grade teacher gave out a homework assignment which had the students make a sentence for each of their spelling words and then circle the "noun" in the sentence. We received his homework back from the teacher with the words, "I, you, He",

89. Algebra

Explain how you can tell the function is not linear by using points on its graph. Make sure to include in your answer the Points you used to determine that the function is not linear.

90. Ratio of two triangles

What would the ratio be if the first triangle has sides of 4cm, 8cm, and 12cm and the second triangle had sides of 1cm, 2 cm, and 3 cm? Would the ratio be 4:1 or 1:1/4?

91. Macroeconomics

Graph the following aggregate supply and demand curves (be sure to draw to scale). Real GDP (in \$ trillions) Price Level Supplied Demanded Increase / Decrease 100 4 16 110 10 15 140 14 12 200 15 6

92. chem

What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?

93. Pre Calculus

There are ten equal parts to a circular track for 2 toy cars and the distance from the inner to the outer is 3.4 inches. What is the width of the track?

94. Physics

A 345N load is suspended from a cable. What is the acceleration of the load if the tension in the cable is 275N£¿

95. Physics

Radio waves travel at the speed of light, which is 3.00 108 m/s. What is the wavelength for a FM station broadcasting at 105.9 MHz (the prefix M is "mega" and means 106)?

96. math

if you made a stack of nickels 100 inches tall,how many nickels would you need

97. calculus

How would you use series to evaluate the lim(x->0) of (x-arctanx)/x^3? I'm getting stuck, and the answer says it's 1/3 but I don't know how they got there.

98. English

Hi! I'm trying to find a lit device for this quote. This quote is from "The Story of An Hour" by Kate Chopin. I'm struggling to find a lit device. So far I've come up with "contrasting diction" but I'm trying to find an even stronger one. Passage: “There

99. Stats

A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled