1. Chemistry 171 Lab

Suppose we collect hydrogen gas, H2(g), over water at 21◦C in a vessel with total pressure of 743 Torr. If the hydrogen gas is produced by the reaction of aluminum with hydrochloric acid: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) what volume of hydrogen

2. Math

Marge bought a computer for \$699 on the installment plan. The terms of the plan were a down payment of \$100, then payments of \$58 a month for 12 months. How much was her total cost?

3. english

read the following line from Poe's "The Raven": "Doubting, dreaming dreams no mortal ever dared to dream before" a)alliteration b)metaphor c)personification d)simile

4. math

Catherine has \$54. She plans to spend more than \$20 of the money for a painting canvas. The rest will go toward paints. Each tube of paint costs \$8.50. Assume that x represents the number of tubes of paint Catherine can buy

5. Math ---HELP!!!!!

A study of a brand of “in the shell peanuts” gives the following results: Number of peanut bags Probability 25 0.003 30 0.020 35 0.090 40 0.150 45 0.350 50 0.217 55 0.170 A significant event at the 0.01 level is a fan getting a bag with how many

6. statistic

A special diet is intended to reduce systolic blood pressure among patients diagnosed with stage 2 hypertension. If the diet is effective, the target is to have the average systolic blood pressure of this group be below 150. After six months on the diet,

7. Pre-Cal

A 13-ft ladder leans against a building so that the angle between the ground and the ladder is 63 degrees. How high does the ladder reach on the building? (round your answer to the nearest foot)

8. math

At noon, one ship A was directly north of another ship B. Ship A was sailing south at 30kph and B was sailing east at 15kph. After how many hours will the two ships be nearest each other?

9. maths

a paper cone has a base diameter of 8cm a height of 3cm. a)caculate the volume of the cone in terms of pie b)if the cone is cut and opened out into the sector of a circle.what is the angle of the sector

10. Math

Two trucks leave the truck stop at the same time, one heading north and one heading south. The truck driving south is driving 15 miles per hour slower than the truck driving north. How fast is the slower truck traveling is they are 1,250 miles apart after

11. Social Studies

What did West Africans trade to North Africans in exchange for salt? A camels (my answer) B gold C silver D masks Am I correct?

12. Algebra

Two cyclists, 128 miles apart, start riding toward each other at the same time. One cycles 3 times as fast as the other. If they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

13. Math ---HELP!!!!!

One hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. Colorblind Not Colorblind Total Male 7 53 60 Female 1 39 40 Total 8 92 100 Find the

14. Math

What is the circumference of the circle round to the nearest tenth and show all work and the area of the circle is 9.5m

15. Math

An airplane is flying 100 km north and 185 km west of an airport. It is flying at a height of 7 km A) what is the straight long distance to the airport? B) what is the angle of elevation of the airplane, from the point of view of the airport?

16. E.L.A

Three centuries of tension between the plebs and patricians led to the __________.

17. geometry

ABCD is a rectangle. All rectangles have congruent diagonals. Which of the following is valid based on deductive reasoning?

18. Algebra

After robbing a bank in Dodge City, a robber gallops off at 12 mi/h. 30 minutes later, the marshall leaves to pursue the robber at 16 mi/h. How long (in hours) does it take the marshall to catch up to the robber?

19. math

How many pounds of a \$1.20 per pound nut mixture must be mixed with two pounds of a 90 cents per pound mixture to produce a mixture that sells for \$1.00 per pound? with explanation

20. maths

cutting a circle into equal sections of a small central angle to find the area of a circle by using formulae

21. Physics

An infinitely long, solid insulating cylinder with radius a has positive charge uniformly distributed throughout it with a constant charge per unit volume p. a) using Gauss's law, derive the expression for the electric field inside the cylinder ra c)

22. physics

rain is falling at 5m/s making 30 degrees with the vertical towards east . to a man walking at 3m/s on a horizontal road towards east , the rain appears to be at a speed of

23. Civics

Speaker 2: The law would make anyone who looks under 18 without an ID after dark into a criminal. That's not the answer; that's a police state. Confining innocent youth to house arrest does not make young people more responsible. Jan decides to do some

24. science

what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

25. science

Suggest an experiment to compare the conductivity of electricity by iron, copper, aluminium and zinc. Perform the experiment and prepare a short report on the resu

26. geometry

If Alphonso takes out the trash, his dad will give him \$10. If Alphonso has \$10 he will go to the movies.

27. Algebra

Statins are used to keep cholesterol in check and are a top selling drug in the US. The equation S-1.5x=6.4 gives the amount of sales (S) of statin in billions of dollars x years after 1998. According to this equation, how much will/did people spend on

28. math

How many 1oz bottles will this solution fill.

29. maths class 6

1. JUGGLING NUMBERS From old newspapers cut out digits 0 to 9 and stick them in a creative manner. Make sure the digits are not too small. Juggle the digits to make the numbers described below. The challenge is you can use a digit only once in a number. 1)

30. Physics

A golf ball is struck with a five iron on level ground. It lands 91.4 m away 4.20 s later. What was (a) the direction and (b) the magnitude of the initial velocity? angle=tan-1(Ry/Rx) for direction R=(Rx^2+Ry^2)^(1/2) I cannot figure out the variables and

31. English

Imagine that there are many children in your locality had missing their parents and they just sent to job by their families.Write a letter to editor of newspaper describing the sad plight of such children and the need to uplift them. And I need to get a

32. History

how has the tension between traditional lifestyles and western influences impacted African cultures?

33. Physics

youre standing on the ground your friend is standing on a balcony of an apartment building 12m above you. you throw a ball straight upward to your friend, it takes 0.536 s to get to her and she catches it when its right in front of her how fast is the ball

34. math

The vertices of triangle IJK have coordinates I(−5, −2), J(−5, −4), and K(−4, −4). Which coordinates are the coordinates of the vertices of triangle IꞌJꞌKꞌ when triangle IJK is rotated 180° clockwise around the origin? A. Iꞌ(5, 2),

35. MGT435

According to the drama triangle, one common characteristic of the rescuer role is_______? 1) refuses to say "no" 2) initiates the attack 3) aggressive behavior 4) nonassertive behavior

36. CHEM LAB

Why must you weigh the beaker containing salt and water before dissolving the salt? Why would it be incorrect/inaccurate to obtain the total mass after dissolving the salt? Explain your answer. (We had to do to create different nacl salt concentration )

37. math

a number with missing digits is given below.study the given clues and find out this number: 6_ _ _6 clues: a). the tens digit is 2 more than thee ones digit. b).the hundreds digit is 5 less than the tens digit. c).the thousands digit is 3 less than the

38. Algebra

nicole is a jewellery designer. she handcrafts all the jewellery she sells online. with every successful sale, she would make a profit of \$30; however, if she makes a mistake during the process, she will lose \$10. Nicole is starting work on her next batch

39. Algebra

Find the sum of (-3a+4cd-6ac)-(7ab-9cd-10ac)+(-8ab+cd-2ac)-(9ab-5cd+CD)

40. Physics

When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 9.00 cm long and 3.00 mm in diameter is compressed an average of 65.0 µm by a 0.490 kg hammer during a 1.20 ms collision. a) What is the average force exerted by

41. Algebra

Valerie needs to rent a car on vacation. The rental company charges \$17.95 plus 16 cents for each mile driven. If Valerie only has \$50 to spend on the rental, what is the maximum number of miles she can drive?

42. Math

A rectangular prism has a base of 42 square inches. If the volume of the prism is 210 cubic inches, which could be dimensions of this prism

43. Frederick

A wire of length 50cm is cut into two parts and each part is bent to form a square. If the total area of the two square is 100cm², find the perimeter of each square.

44. Physics

i)A boy of 45kg is 5m above a swimming pool on a spring board. The boy jumps up into the air which is 2m above the spring board before falling into the water. What is the maximum depth the boy can reach in the water if the average resisting force of water

45. math

two bus start from the same bus stand at 8a.m. one travels at 40km/h and other at 50km/h. the second bus reaches the next stop at 10a.m.How much later will the first bus arrive?

46. Math

A recipe calls for 2 1/2 cups of chocolate chips to make a batch of five dozen (60) cookies. On average how many cups of chocolate chips would be in each cookie? I have tried everything and still can not get the answer

47. st.joseph science

Calculate the molecular formula of a compound whose empirical formula is CH2O AND vapour density is 30

48. English

1. Look at the abandoned dogs. 2. Look at the deserted dogs. (Which one is a correct term? Can we use both expressions? Do you have some other terms?) 3. A dog is a companion animal. I have two companion dogs. (Is this expression right?)

49. Chemistry

what is the percent by mass of a solution by dissolving 200 g of NaCI in 500 mL of water?

50. English

The sandy area is 1.5 km in length, 40 km in width and has an area of 60,000 square meters. ------------------- Would you check the sentence an correct errors, please?

51. English

The sea is shallow, and we can not notice a major shift in a tidal change. ------------ Would you check this sentence? Thank you.

52. Chemistry

Considering only the molecular orbitals formed by combinations of the s atomic orbitals in the valence shell, how many molecular orbitals can be formed by 5000 sodium atoms?

54. math

There are 2 trains, one in Los Angeles and the other one in Denver. Train 1 left Los Angeles at 10am and was traveling east at a speed of 100 mph. Train 2 left Denver at 1pm and was traveling west at 80 mph. Which train is closer to Los Angeles when they

55. Math problem solving

At the hardware store , you buy hammers for \$ 30 a dozen. And sell them for \$ 3.50 each. What is the percent mark up for the hammers?

56. Math

Father Armando the math teacher adds Bens and the Indians scores atop each other and gets these numbers. 1, 2, 6, 7, 10, 12 Also, go back for Seconds.

57. Pre-Cal

Evalute the expressions: 1). sin(π/3)+cos(π/3) 2). (cos 45°)^2-(sin 45°)^2

58. science

The mass of the girl in earth is 24kg. What is her mass and weight in moon if the moon's gravity is 1/6 of the earth' gravity?

59. Math Functions

A stock went on the market and began with a start value of \$2. After 6 months of being on the market it reached its maximum value of 52\$ but then dropped back down to 2\$ by the 12th month. Three competing investment firms have come up with the following

60. science

A skier with a mass of 60.0 kg starts from rest and skis down an icy (frictionless) slope that has a length of 53.0 m at an angle of 25.4° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow

61. English

They went to an animal doctor. The vet said, "This pet is almost blind." The wife said to her husband, "What are you going to do?" --------------------------- What is the difference between them in meaning? 1. What are you going to do? 2. What will you do?

62. CALCULUS

Find the derivative of y=4sinx−2cosx

63. Algebra

Subtract (5x²-6x+4) from the sum of (-3x²+3x+1) and 2x²-5x+7)

64. math

Using paranthesis and exponents use five 3s to write an expression whose value is 29

65. Math

Elenore made an 850 mile trip east. She traveled 2 hours by jet and 30 minutes by a private propeller plane. If the speed of the jet was four times the speed of the propeller plane, what was the speed of the jet?

66. Math

Among a group of people, 10% are from NYC and 90% are not. All people from NYC are under 18 years old, and 70% of those not from NYC are also under 18 years old. One person is chosen at random, and he or she is under 18. What is the probability that the

67. physics

a young's double slit arrangement produces interferences fringes which are 0.004 rad apapt for wave lenght 589nm. For what wavelenght the angular seperation would be 10% greater?

68. Math

Lesson is on using formulas A=l*w Create formulas for the following relationships. A. The relationship between the number of tires (not including spares) and the number of cars in a parking lot. B the relationship between the number of minutes to the

69. Math

How cub will it cost to buy a rug 9 by 12 at 60 cent a foot

70. math

what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

71. management

what are the 10 most otstanding businesses in the philippines? who are the 10 most outstanding managers in the philippines? contributers of management?

72. English

1. Also many events and festivals are held with (the) opening of the sea. (Is it correct? Do we ahve to sue 'the' here?) 2. The beach provides tourists with other attractions every year. ------------------- Are they grammatical?

73. math

find all two-digit odd number, the sum of whose is 9

74. math

anna is 5yrs old. i am six years more than twice her age

75. English

1. I'll take him the dog. 2. I'll take the dog to him. 3. I'll bring him the cat. 4. I'll bring the cat to him. 5. I'll bring him it. 6. I'll bring it to him. 7. I'll take him this. 8. I'll take this to him. --------------- Is each pair the same and

76. English

Many years passed. --------------------- If a person uses the sentence above, how many years does the person have in mind? More than 5 years? Over 7 years? More than 10 years? How about you?

77. science

what is the unit of thermal capacity?

78. maths

A man had16 mangoes.he gave1/4to bob and1/2tohis sister candy.how many mangoes remained after he shared with Bob and Candy?

79. college algebra

in a class of 30 students all of them are either female or smokers. while only 5 are female and smokers. if there are 12 male smokers in the class, then how many female nonsmokers are in the class?

80. teas

which of the following is the main function of vitamins? A.provinding structure to cell membrane B.supplying brain with energy source c.Facilitating action of enzymes D.Promoting absorption of carbohydrates

81. algebra

x/x-2 +x-1/x+1 = -1 How do I find the solution to this equation?

82. physics

the angle b/w vectors (A¡ÁB ) and (B¡ÁA) is

83. Geometry

Find mAD if CA is a diameter of circle P

84. English

Write a speech in the following situation- You are the leading actor in a school play It is the interval in the play. The first half was dreadful, with actors forgetting their lines, props falling over and the audience laughing for the wrong reasons..‟

Ella wants to build a rectangular pen for her dogs with two distinct sections. The area of the enclosure can be represented by A= Xy and the total length of fencing can be represented by 3x + 2y = 60. If she had 60 ft of fencing to work with, determine the

86. Math

The formula A=l*w is in this formula ⏹=🔼*⏺ What other formulas in this form can you think of?

The graph of the function f(X)= 4x^2 -17x-9 has two X intercepts. What is the value of the larger X intercept to one decimal place?

What is the range of 4(X-5)^2 + 7

89. Math

I am 3 digit number my hundreds digit is 4 times my ones digit and my tens digit is their difference. What number am i?

90. Calculus

F(x)=2x^2-log(x+5)/√16+x

91. English

Does anyone have an old compare and contrast essay i can use?

Bacterial Gene Transfer - Conjugation Please Clarify These Questions For Me! 1) Explain the purpose of the controls used in the mating experiment 2) It is necessary to make dilutions prior to plating in Week 1 in order to obtain single colonies. Why are