vivian

Most popular questions and responses by vivian
1. Chemistry

Which of the following solutions will have a higher boiling point? A. 1m C6H12O6 B. 1m NaCl C. 1m MgCl2 D. 1m AlCl3 And pls explain why it is. Thank you so much!!

2. chemistry

What would be the pH of a 0.563 M solution of ammonia (NH3) at room temperature? The Kb of ammonia is 1.78 × 10−5. 1. 2.5 2. 7 3. 9 4. 4.5 5. 11.5 ( I did this problem but apparently 4.5 isnt the answer)

anthony has decided to purchase a \$19000 car. he plans to put 20% down toward the purchase and to finance the rest at a 6.8% interest rate for 4 years. find the monthly payment

4. Hypothesis - Statistics

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a

5. chem

Ka=1.8x10^-5. How do you calculate the value of pKa?

6. Maths

A right pyramid on a base 4cm square has a slant edge of 6cm.calculate the volume of the pyramid

A petty cash fund of \$100 is replenished when the fund contains \$3 in cash and receipts for \$93. The entry to replenish the fund would debit Cash Over and Short for \$4. credit Miscellaneous Revenue for \$4. credit Cash Over and Short for \$4. debit

Calculate the theoretical yield for the bromination of bothstilbenes and cinnamic acid, assuming the presence of excesspyridinium tribromide. cinnamic acid - 150 mg cis-stilbene - 100 μL trans- stilbene - 100 mg pyridinium tribromide - 200-385 mg

9. Physics

Two points in the xy plane have Cartesian coordinates (2.00, -4.00) m and (-5.00, 5.00) m. (a)What is the distance between these two points? (b) What are their polar coordinates?

10. Chemistry

During recrystallization, an orange solution of a compound in hot alcohol was treated with activated carbon and then filtered through fluted paper. On cooling, the filtrate gave gray crystals, although the compound was reported to be colorless. Explain why

11. math (statistics)

There are 15 qualified applicants for 5 trainee positions in a fast-food program. How many groups of trainees can be selected? I have a feeling that the answer is 75 but I'm not too sure. Any help is appreciated. Thank you! The first trainee can be any one

12. Algebra

A box contains 5 yellow balls, 3 blue, and 1 red ball. Two balls are drawn at random. Find the probability that the two balls are yellow

13. chemistry

Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 92.5 g/mol, Kb = 8.1×10−4) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 175.0 mL. (I got the answer

14. chemistry

Consider the ionization constants hypochlorous acid (HOCl) : Ka = 3.5 × 10−8; ammonia (NH3) : Kb = 1.8×10−5. A solution of ammonium hypochlorite (NH4OCl) is 1. acidic, because the cation hydrolyzes to a greater extent than the anion. 2. basic,

15. physics

Four copper wires of equal length are connected in series. Their cross-sectional areas are 0.96 cm^2, 2.02 cm^2, 2.90 cm^2, and 5.06 cm^2. A potential difference of 116 V is applied across the combination. Determine the voltage across the 2.02 cm^2 wire.

16. Chemistry

Why was sublimation performed under reduced pressure?

17. organic chem

Please help! It's one of the prelab questions. **Exp. Ethanol from Sucrose The diethylacetal of acetaldehyde can be detected by gas chromatography. How does this impurity arise in fermentation? **Exp. Acetaminophen In the reaction between p-aminophenol and

Give equations to show how sulfuric acid can convert 4-methylcyclohexene into a mixture of four isomeric c7H12 compounds(including starting material). Predict the relative amounts of each isomer.

Explore the theme of loneliness and discuss how the writer has conveyed this to the reader through their use of language and style.The poems, Night Waitress by Lynda Hull, The Lady in The Pink Mustang by Louise Erdrich, and Those Winter Sundays by Robert

20. gravimetric

in the gravimetric determination of barium in BaCrO4, what weight of sample must be taken so that the weight of the precipitate in milligrams multiplied by 100 will equal the % Ba in the sample?

21. Math

Harry mixed 1.3 liters of Grape juice, 2.3 liters of ginger ale and 1.7 liters of orange juice for punch. About how many liters of punch did Harry make?

22. organic chem

An unknown compound melted at 131-133°C. It is thought to be one of the following compounds(mp,°C): trans-cinnamic acid (133-134); benzamide(128-130); DL-malic acid(131-133); or benzoin(135-137). The mixture melting points of the unknown compound with

23. chemistry

2 solutions of equal amounts in a u-tube are separated by a semipermeable membrane. The level os the (more/less( concentrated will rise. I think the answer is (more) but I'm not sure. What do you think?

24. chemistry

Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 92.5 g/mol, Kb = 8.1×10−4) with 0.1000 M HCl solution. The volume of the solution at the equivalence point is 175.0 mL. (I got the answer

25. chemistry

What would be the pH of a 0.563 M solution of ammonia (NH3) at room temperature? The Kb of ammonia is 1.78 × 10−5. 1. 2.5 2. 7 3. 9 4. 4.5 5. 11.5 ( I did this problem but apparently 4.5 isnt the answer)

26. Language arts

Can someone give me an example of a metaphor? Is a mouse in front of the yawning maw of a python, a metaphor? Sorry, I wrote the question wrong.!!! ---------------------------------------------------- Is He's paralyzed, a mouse in front of the yawning maw

27. accounting

On May 31, 2011, James Logan Company had a cash balance per books of \$6,781.50. The bank statement from Farmers State Bank on that date showed a balance of \$6,404.60. A comparison of the statement with the cash account revealed the following facts. The

28. Maths

Calculate the volume and curved surface area of a cone 14cm in base diameter and 24cm high

29. Biology

Natural selection is an example of a mechanism of evolution. Does this mechanism produce a change in individuals or populations? Explain!

30. math

A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

31. Math

A scientist travels straight down for 90 seconds at a speed of 3.5 feet per second and then travels directly up for 30 seconds at a speed at a speed of 2.2 feet per second after this 120 second period,how much time in seconds,will it take for the scientist

32. math

A government survey conducted to estimate the mean price of houses in a metropolitan area is designed to have a margin of error of \$10,000. Pilot studies suggest that the population standard deviation is \$70,000. Estimate the minimum sample size needed to

33. Math

Tau ,Igo,Iron shared a bag of mangoes in the ratio 7:5:14 If Igo receives 18 mangoes less than Iro,how many mangoes does Iro receive?

34. Physics

A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest tenth?

35. programming in c++

a program in c++ that accepts exam marks for 10 students and stores them in an array.the program should then calculate and utput the average marks for the class.and give an account of marks below average and output all marks above average.

36. chemistry

Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

37. social studies

What did the Spanish hope to do in California?

38. gravimertic prob

an organic pesticide (mw 183.7) is 8.43% cl. a 0.627g sample containing the pesticide plus inert material containing no chloride was decomposed with metallic sodium in alcohol. the liberated chloride ion was precipitated as agcl weighing 0.0831g. calculate

39. Government

Which of the following countries is NOT a member of the G-7? Germany France Italy Great Britain Spain

40. math

In Carl's drawer, he has white,gray,and black socks. In his closet,he has black brown,and blue shoes. I need to make a diagrdiagram to display the sample space for Carl choosing a sock and shoe color. Is this right White/black,brown blue

41. math

On May 31, 2011, James Logan Company had a cash balance per books of \$6,781.50. The bank statement from Farmers State Bank on that date showed a balance of \$6,404.60. A comparison of the statement with the cash account revealed the following facts. The

42. Math

Don't understand how to solve this problem: 12. A, B, C, and D are points on a line, and the lengths of the line segments are: AB = 12, BC = 4, CD = 7, and DA = 15. Which of the following is a possible order for the points? A.A,B,C,D B. A,C,D,B C. A,D,C,B

43. Chemistry

To clarify, a triple bond between carbon and oxygen is more stable than a triple bond between carbon and nitrogen because oxygen is more electronegative. Is my understanding correct?

Hi, I have this question that I will be tested on but my teacher didn't teach us how to do it so I am confused on how to even start. Please explain on how to start the question...thank you How bright a star appears can depend on how much light the star

45. chemistry

Calculate the theoretical pH when 5.00 ml of 0.0100 M HCl is added to 30.00 mL of deionized water.

46. chemistry

What is the pH of 8.94 × 10−6 M HCN(aq), ignoring the effect of the autoprotolysis of water? 1. 7.17923 (basic; thus not reasonable) 2. 6.03594 3. 7.30027 (basic; thus not reasonable) 4. 5.50032 5. 7.38101 (basic; thus not reasonable) 6. 5.18207 7. None

47. gravimetric prob

A sample of freshly precipitated silver chloride weighs 704.7mg. Before the solution can be filtered and washed 10.0mg of AgCl is photodecomposed. After the precipitate is filtered and washed another 10.0 mg of AgCl is photodecomposed. Calculate the weight

48. chemistry

A mixture of 16 g of salt and 47 g of baking soda is poured into 296 ml of water. What is the total mass of the mixture in grams?

49. chemistry

The freezing-point depression is -0.930 Celsius degree. Determine the molality of the solution of an unknown nonelectrolyte in water. Please help!! I do not understand this problem!

50. physics

A ball is thrown horizontally at 15 m/s from a clifftop 60 m above the sea level. Find: a) the time to land; b) the angle at which it hits the water; ° below the horizontal c) the speed at which it hits the water. m/s

51. chemistry(Acid&Base)

Calculate the solubility product of calcium hydroxide if the solubility of Ca(OH)2(s) in water at 25◦C is 0.011 M. Choices: 1. 1.1 × 10−5 2. 5.3 × 10−6 3. 2.7 × 10−6 4. 1.5 × 10−8 5. 1.2 × 10−4

Listed below are five procedures followed by The Beat Company. Several individuals operate the cash register using the same register drawer. A monthly bank reconciliation is prepared by someone who has no other cash responsibilities. Ellen May writes

53. Limits

Lim (tan^2(x)/x) x->0

54. Math

Calculate the amount of fluorescein (MW 332.31) you will need to make 10 mL of 15 mM solution in ethanol (EtOH). My answer:0.05 g 2.Using Equation C1V1=C2V2 calculate the volume of stock solution (15 mM) you need to make 1 mL of each working solution

55. gravimetric prob

A pure organic compound weighing 947.4mg was heated in a stream of oxygen. The effluent gas was swept successively through a tube of magnesium perchlorate dessicant weighing 18.6137g and a tube of Ascarite weighing 16.8425g. After several minutes the tubes

56. math

Mia is stacking copies of a new book in a square-pyramid display by the front window of her bookstore. for each consecutive layer, she places one book where four meet. A. I the bottom row of the display has 144 books and there is one book on the top,

how does Eudora Welty use dialogue to establish characters and character relationship in A Visit of Charity?

58. math

In recent years, Juresic Transportation purchased three used buses. Because of frequent turnover in the accounting department, a different accountant selected the depreciation method for each bus, and various methods were selected. Bus Acquired Cost

59. math

Information related to Hermesch Company for 2011 is summarized below. Total credit sales \$2,200,000 Accounts receivable at December 31 825,000 Bad debts written off 33,000 What amount of bad debts expense will Hermesch Company report if it uses the direct

60. accounting

Eddings Company had a beginning inventory of 400 units of Product XNA at a cost of \$8.00 per unit. During the year, purchases were: Feb. 20 600 units at \$9 Aug. 12 300 units at \$11 May 5 500 units at \$10 Dec. 8 200 units at \$12 Eddings Company uses a

61. Physcology

Final Project: Interview Profile • Resources: Ch. 5 (pp. 213-19); Ch. 6 (pp. 225-38); Ch. 9 (pp. 330-39); Ch. 11 (pp. 441- 46); Ch. 15 (pp. 571-80) in Psychology: An Introduction (12th ed.) Appendix A • Due Date: Day 7 [post to the Individual forum]

62. Sociology

Discuss the inside and remote circumstances that led to the emergence of sociology as a distinct field of study.

63. Chemistry

1. An empty balloon weighs 10.0 g and is filled to a volume of 20.0 L with CO gas. If the density of air at 25.0 °C and 1.00 atm is 1.17 g/L, will the balloon float? 2. Determine the volume of gas produced at 20.0 °C and 1.00 atm from the complete

64. Math

A 9.2 ounce can of tomato juice costs \$3.48. What is the price per ounce of the tomato juice to the nearest cent?

65. Chemistry

Two liquids A and B have vapor pressures of 71.3 and 131 mmHg, respectively, at 25 degrees Celsius. What is the total vapor pressure of the ideal solution made up in the following concentrations? 1.00 mole of A and 1.00 mole of B 2.00 moles of A and 5.00

66. arithmetic

The first three terms in an arithmetic are given by x,4x+5 and 10x-5.find the value of x.

Tavarez Company assembled the following information in completing its July bank reconciliation: balance per bank \$15,280; outstanding checks \$3,100; deposits in transit \$5,000; NSF check \$320; bank service charge \$100; cash balance per books \$17,600. As a

On May 31, 2011, James Logan Company had a cash balance per books of \$6,781.50. The bank statement from Farmers State Bank on that date showed a balance of \$6,404.60. A comparison of the statement with the cash account revealed the following facts. The

69. science

in gas chromatography, if the two peaks in chromatogram are too close, what changes in experimental conditions could make to separate them more effectively?

70. bio

In heart sound contain of two sound "Lub" and "Dub" When one of these sounds is not distinct, but is more of a gurgle, a person is said to have a heart murmur. What could cause this?

71. math

Find all the x-intercepts of the curve y=4x^4-17x^2-15

72. Math

If each edge of a cube is increased by 2 inches, the A. volume is increased by 8 cubic inches B. area of each face is increased by 4 square inches C. diagonal of each face is increased by 2 inches D. sum of the edges is increased by 24 inches is the answer

73. PHYSICS

A spring 20bn long is stretched to25cm by load of 50N.what will be its length when stretched by 100N,assuming elastic li

74. Optimization

Determine the values of the constants α and β so that the function f (x) = x3 + αx2 + βx + δ may have a relative maximum at x = −3, and a relative minimum at x = 1.

75. Math

1. Calculate the amount of fluorescein (MW 332.31) you will need to make 10 mL of 15 mM solution in ethanol (EtOH). My answer:0.05 g 2.Using Equation C1V1=C2V2 calculate the volume of stock solution (15 mM) you need to make 1 mL of each working solution

76. Grammar

Which is correct? I think the second one is correct. 1. Thank you John, Peter, Susan, and Veronica to be a part of the crew. OR 2. Thank you John, Peter, Susan, and Veronica for being a part of the crew.

77. math

What is the smallest six digit number you can make that would round to 126000?

78. Calculus 2

how do we know if the curve theta = pi/2 is a circle, or semicircle, or spiral? I've tried to change the curve to x and y, but both sides of the equation are the same, and tan(pi/2)=infinity.

Greg will need \$218,000.00 in 15yrs for college bills, how much does he have to invest today @8% compounded semiannually?

"Most Americans would follow a thinker rather than become one themselves." Please help me explain that sentence, and also give me examples!!!who is a thinker?? in what situation do they follow the thinker, and why????

81. Chemistry

what is a common physical property of ester?

82. math

Eddings Company had a beginning inventory of 400 units of Product XNA at a cost of \$8.00 per unit. During the year, purchases were: Feb. 20 600 units at \$9 May 5 500 units at \$10 Aug. 12 300 units at \$11 Dec. 8 200 units at \$12 Eddings Company uses a

83. Eth

Did African Americans suffer from segregation?

84. Calculus?

how do you expand Ln abs(ã7 x^3+2x^2)

85. math

the sum of two numbers is 60. their difference is 6. construct a system of equations and algebraically find the value of the smaller number.

86. Grammer

Combine these 2 sentences with an adverbial clause: The mountain was breathtaking. We took a picture of it.

87. Chemistry (Ochem)

I know that there is such thing as inversion of stereochemistry,but is there such thing as inversion of stereocenter? Are stereocenter and stereochemistry the same thing or mean the same thing? Thank you, Vivian

88. accounting

Given the cost of direct materials of \$500 and the labour rate of \$20 per hour. Assuming the predetermined overhead rate is \$5 per hour and the actual hours is 50 hours - please calculate the total cost of this job?

89. Chemistry

True or False? An identical cylinder filled with the same pressure of hydrogen contains more molecules because hydrogen molecules are smaller than oxygen molecules.

90. Math

Equation: C1V1=C2V2 Given: C1= 15 mM V1=? C2= 0.25 mM V2= 1mL (Do I just plug 1mL into the equation or do I have to convert to liter? Does mM mean mmol/1L?) I got ~17 microliter. Note: I must convert my answer to microliter.

91. Algebra

Write each series as a summation in sigma notation. (−1)^2+0^2+1^2+2^2+3^2

92. Algebra

Write each series as a summation in sigma notation. 5+8+11+14 i=1

93. Physics

A plane traveling at 200.0 km/h attempts to land on a 250 m runway. The plane’s engines and brakes accelerate uniformly at –7.0 m/s2. Will the plane be able to land safely? Show all your work. Include any equations used, including the given and the

94. Physics

A ball is thrown at 41° below the horizontal from a rooftop of height 65 m. It lands 2 s later. Find: Find: a) its initial speed b) the point of impact with the ground; m from the base of the building c) the angle at which it hits the ground. ° below the

95. Physics

An electron in an atom has a speed of 2.2 × 10^6 m/s and orbits the nucleus at a distance of 5 × 10^-11m.a)What is its centripetal acceleration? b)A neutron star of radius 17 km is found to rotate at 5 revolutions per second. What is the centripetal

96. math

in an album, the ratio of the number of local stamps to the number of foreign stamps was 7 : 4. When Lucy gave away 8 local stamps and 8 foreign stamps, there were 1.8 as many local stamps as foreign stamps in the album. find the total number of stamps

97. math

explain how to compare 0.34 and 0.27

98. organic chem

How do injector temperature and detector temperature affect retention time of a compound in gas chromatography?

99. organic chem

in simple distillation or fractional distillation do the changes in temperature occur more gradually? and why?