# Ken

Popular questions and responses by Ken
1. ## chemistry who step by step for me

1.2g mixture of na2c03 and k2c03 was dissolved in water to form 100cm3 of solution, 20 cm3 of this solution required 40cm3 of 0.1 hcl for neutralization. Calculate the weight na2c03 and k2c03 in the mixture? My calculation 20cm3/100cm3 = 0.2 x/53 +

2. ## chemistry

For the reaction at equilibrium: 3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2(g), removing some of the product, Fe3O4(s), would: Answer A. Increase the value of the equilibrium constant, K B. No change C. Decrease the value of the equilibrium constant, K D. Shift the

3. ## chemistry

A reaction with an equilibrium constant Kc = 1.5 x 10-25 would consist of which of the following at equilibrium: A. some reactants and products with products slightly favored B. essentially all products C. some reactants and products with reactants

4. ## Mathematics

The sums of two numbers is -5. Five times the first number equal two time the second number find the numbers

5. ## chemistry please step by step for me

what volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen I know this calculate this part, but I do not get the answer 333.3ml 1.2g/ml x 1000 x 0.365/36.5 =

6. ## Chem II

A 0.10 M HF solution is 8.4% ionized. Calculate the H^+ ion concentration. Here is my line of thought. For every mole HF disolved yeilds one mole of H^+. Since there is ).10 M HF, and the solution is 8.4% ionized = 0.84 M. Is this correct?

7. ## Chem II

Whih of the following liquids would make a good solvent for iodine? HCl H2O CH3OH NH3 CS2 How do you determine what will make a good solvent for something

8. ## Physics

Town A lies 20 km north of town B. Town C lies 13 km west of town A. A small plane flies directly from town B to town C. What is the displacement of the plane. Please explain how you got the answer

9. ## chemistry

Kp for the reaction CO2(g) + C(s) 2CO(g) is 1.47 at 727°C. Calculate Kc at this temperature Answer A. 0.0179 B. 0.0246 C. 121 D. 87.7 E. 1.47

10. ## chemistry

Concerning the following reaction at equilibrium: 3Fe(s) + 4H2O(g) Fe3O4(s) + 4H2(g), increasing the concentration of the Fe(s) would: Answer A. Shift the equilibrium to the right B. Shift the equilibrium to the left C. No change D. Increase the value of

11. ## chemistry step by step for me Bob

A sample of peanut oil weighing 2g is added to 25ml of 0.4M koh. After saponification is complete, 8.5ml of 0.28M hes04 is needed to neutralize excess of koh. The saponification number of peanut oil. The right answer 146.75 Bob solve it for me step by step

12. ## chemistry step for step thank a lot

10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of cac03. The answer 1000 I think ppm= 1mg/1L 10L x 100g/mol cac03 = 1000 Who check it for me step by step Thank all tutors for your help. How many ml of a 0.05M

13. ## Chemistry

1. According to the collision theory of chemical reactions: A. High energy collisions result in few successful reactions as there isn’t sufficient time for the products to react. B. High energy collisions lead to the successful formation of products. C.

14. ## Chem II

Which of the follwoing gives the molarity of 17.0% by mass solution of sodium acetate (molar mass = 82.0 g/mol) in water. The density of the solution is 1.09 g/mL. OK - I know that to figure molarity is moles divided by liters. This is confusing me because

15. ## physics

A ball is attached to a string with length of L. It swings in a horizontal circle, with a constant speed. The string makes an angle (theta) with the vertical, and T is the magnitude of the tension in the string. 1)Determine the Mass of the Ball.

16. ## chemistry step by step for me clearly

Al2(s04)3 solution of a molal concentration is present in 1 litre solution of 2.684g/cc. How many moles of bas04 would be precipitated on adding bacl2 in excess. The answer 6M I want some tutors to explain for me step by step clearly. I do not still

17. ## Chem II

A 0.10 M HF solution is 8.4% ionized. Calculate the H^+ ion concentration. The "8.4% ionized" is throwing me. This is my line of thinking. For every mole HF disolved yeilds one mole of H^+. Since there is 0.10 M HF and the solution is 8.4% ionized = 0.84

18. ## Physics

A 10.0-m long wire whose total mass is 39.5 grams is under a tension of 577 N. A pulse is sent down the left end of the wire and 29 ms later a second pulse is sent down the right end of the wire. Where do the pulses first meet?

19. ## Algebra

How do I rearrange this equation to solve for m1 (step by step) r1/r2 = √m2/m1

20. ## chemistry step by step for me thank a lot

What is the weight of ca(oh)2 required for 10 litre of water remove temporary hardness of 100 ppm due to ca(H03)2 The answer 0.74 Thank all tutors for your help Pls show step by step for me

21. ## algebra

in 1991 the life expectancy of males in a certain country was 68.2 years. in 1995 it was 70.8 years. let e represent the life expectancy in year t and let t represent the number of years since 1991

22. ## Chem II

The equilibrium constant, Kp for the reaction PCl5 PCl3 + Cl2 is 1.05 at 250 degrees C. The reaction is started with PCl5, PCL3 and Cl2 at 0.177, 0.223, and 0.111 atm at 250 degrees C. When the reaction comes to equilibrium, the pressure of _________ PCl3

23. ## Pre-Calc

Alexa is weighing a construction barrel up a ramp 4 feet long into the back of a truck. The barrel weighs 120 pounds and the ramp is 45 degrees from the horizontal. How much work is Alexa doing?

24. ## Chemistry

What volume of 17 M sulfuric acid must be used to prepare 0.15 L of 1.78 M H2SO4?

25. ## chemistry

A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A. some reactants and products with reactants slightly favored B. essentially all products C. essentially all reactants D. approximately equal

26. ## Physics

An airtight box, having a lid of area 12 in2, is partially evacuated. Atmospheric pressure is 15 lb/in2. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:

27. ## calculus

A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is L(t) = 12 + 2.8 sin 2π/365(t − 80) . Use this model to compare how the number of hours of daylight is increasing in Philadelphia on April 21 and June 5. (Assume

28. ## physics

Town A lies 20 km north of town B. Town C lies 13 km west of town A. A small plane flies directly from town B to town C. What is the displacement of the plane.

29. ## mathematics

a car travelled 100km in 8hours and the remaining 40km in 2hours.calculate the average speed

30. ## chemistry Ben

50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. molarity of cl ions in the resulting solutions is At.wt of ba = 137 100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of

31. ## chemistry

What volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen The answer 333.3ml Who helps me step by step for me

32. ## mathematics

a car travelled 100km in 8hours and the remaining 40km in 2hours.find the average speed

33. ## Geography

I had 2 questions need to be done by the night, please help me 1. Calculate the noon sun angle for New Orleans, USA(30N), and for Helsinki, Finland(60N), on each of the following dates: march 21, june21, sep 22, dec 22,10/3 2. What are the zenith angle and

34. ## geometry

In triangle ABC, BC=40m , AB=50m and Angle A=53 degree. Determine the area of a triangle.

35. ## Chem II

The molecularity of the elementary reaction CH3NC ---> CH3CN is _____ six two zero ond

36. ## Chem II - Equilibrium

A 2.00 mol sample of nitrogen dioxide was placed in an 80.0L vessel. At 200 degrees C, the nigrogen dioxide was 6.0% decomposed according to the equation: 2NO2 in equilibrium 2NO + O2 Calculate the value of Kc for this reaction at 200 degrees C. I have

37. ## Math

if 8000 is invested in a long-term trust fund with an interest rate of 5% compounded continuously what is the amount of money in the account after 15 years?

38. ## Math

One spinner has two sections. They are marked A and B . Another spinner has four sections. They are marked 1 , 2 , 3 , and 4 .

39. ## geometry

What is the area of a sector with a central angle of 210 degrees and a diameter of 4.6 m?

40. ## chemistry

Hydrogen sulfide burns in oxygen to form sulfur dioxide and water. If sulfur dioxide is being formed at a rate of 0.19 mol L-1 s-1, what are the rates of disappearance of hydrogen sulfide and oxygen? rate of disappearance of O2? rate of disappearance of

41. ## World History

Why did Mesopotamia city-states flourished? Was it due to specialized labor or conquered an area large enough to make themselves self-sufficient.

42. ## chemistry Step for step for me thank a lot

A sample of peanut oil weighing 2g is added to 25ml of 0.4M koh. After saponification is complete, 8.5ml of 0.28M hes04 is needed to neutralize excess of koh. The saponification number of peanut oil I do not still understand Pls clearly step by step for

43. ## Chemistry

How many grams of glycine amide (FM 74.08) should be used with 1.0 gram of glycine amide HCl (FM 110.54, pKa=8.20) to give 100 mL at pH 8.0? The buffer equilibrium reaction is: GlycineAmideHCl GlycineAmide + H+ which has the general form: BH+ B + H+ I'm

44. ## Chemistry

An unknown molybdate (MoO4^-2) solution (50.00ml) was passed through a column containing Zn(s) to convert molybdate into Mo^3+. One mole of MoO4^-2 gives one mole of Mo^3+. The resulting sample required 22.11 ml of 0.01234 M KMnO4 to reach a purple end

45. ## math

suppose a pair of dice is rolled. Consider the sums of numbers on the top of the dice. Find the probabilities: a) P(5, given that the sum are odd) b) P(odd, given that the sum rolled is 5) c) P(7, given that one of the dice rolled was odd)

46. ## Chem II

A first-order reaction is 35.5% complete in 4.90 minutes. The rate constant of the reaction is _____

47. ## Chem II

The reaction A -->B---> C is called a _______ reaction? Consecutive parallel competing stepwise

48. ## Chem II

What is the boiling point of an aqueous solution of a non electrolyte that has an osmotic pressure of 10.50atm at 25 degrees C? Kb of water is 0.52 degrees C/m. Assume the density of the solution is the same as that of pure water.

49. ## Chem II

In the question Consider a 0.90 M Al(NO3)3 solution. This solution has a nitrate ion concentration of . . . . How do you figure the nitrate ion concentration?

50. ## Economics

Willy's widgets, a monopoly, faces the following demand schedule (sales of widgets per month): Price \$20 30 40 50 60 70 80 90 100 Quantity 40 35 30 25 20 15 10 5 0 Calculate marginal revenue over each interval in the schedule (for example, between Q = 40

51. ## math

Trig Identities prove sinx+1 \ 1-sinx = (tanx+secx)^2

52. ## Solid mensuration

the circumference of a cirle is pi meter. how long is the side of the largest square that can be cut from the circle

53. ## math

How much pure acid must be added to 2 liters of a 10% solution of acid to obtain a mixture that is 20% acid?

54. ## Chemistry

The volume of a sample of a gas collected over water at 32 Celsius and 752 torr is 627 ml. What will the volume of the gas be when dried and measured at STP? (Vapor pressure of water at 32 Celsius = 35.7 torr)

55. ## Algebra 2

Jason loves to download music. Downloads R Us sells songs only in packages of three, and it charges \$2.00 for each package of three songs. Jason's favorite group just released their greatest hits CD, which has 17 songs on it. Jason wants to buy all 17

56. ## Chemistry

Cola drinks have a phosphoric acid content that is described as `from 0.057% to 0.084% of 75% phosphoric acid, by mass." Estimate the pH range of cola drinks corresponding to this average range of H3PO4 content. I am having trouble with the wording of this

57. ## chemistry step by step for me

100ml of h2s04 solution having molarity 1M and density 1.5g/ml is mixed with 400ml of water. Calculate final molarity of h2s04 solution if final density is 1.25g/ml. 50ml of 20.8% bacl2 and 100ml of 938% h2s04 solutions are mixed. Molarity of cl ions in

58. ## math

plot the number on the number line 1 5/6

59. ## pharmacy math who helps me step by step for me

How much 30% alcohol, 45% alcohol, 60% alcohol and 95% alcohol could be mixed to make 200ml of alcohol? the right answer 30% is 112.5ml 45% is 25ml 60% is 12.5ml 95% is 50ml Who helps me step by step clearly Please some professional tutor solve it

60. ## physics

when a force of 0.245 newtons is applied to a body of mass 250g which is resting on a horizontal plane, the body is found to be in a limiting equilibrium. find the coefficient of friction between body and planes.

-Steam at 100 ¡ãC is mixed with 166.4 g of ice at ¨C32.8 ¡ãC, in a thermally insulated container, to produce water at 44.6 ¡ãC. Ignore any heat absorption by the container. -Cwater = 4186. J/(kg ¡ãC) -Cice = 2090. J/(kg ¡ãC) -Lf,water = 3.33

62. ## Physics

Monochromatic x-rays (λ = 0.166 nm) from a nickel target are incident on a potassium chloride (KCl) crystal surface. The spacing between planes of atoms in KCl is 0.314 nm. At what angle (relative to the surface) should the beam be directed for a

63. ## college trigonometry

verify identity: (tanx-cotx)/sinxcosx=sec^2x csc^2x

64. ## math

verify identity: tanx=cscx-cotx

65. ## Chemistry

CHemical equation showing how NH3 behaves as a base when dissolved in water

66. ## Chemistry

How do I start an ICE table from the following information: BrCl3(g)+ Cl2(l) -> BrCl5(g) where Kp=7.8*10^-6 and there is originally 0.215 atm BrCl3, 725g Cl2, 0.115 atm BrCl5 - Can pressures be used as initial concentrations?

67. ## chemistry

The solubility of silver chloride can be increased by dissolving it in a solution containing ammonia. AgCl (s) Ag+ (aq) + Cl- (aq) K1 = 1.6 x 10-10 Ag+ (aq) + 2NH3 (aq) Ag(NH3)2+ (aq) K2 = 1.5 x 107 What is the value of the equilibrium constant for the

68. ## chemistry

When the following reaction is at equilibrium, which of these relationships is always true? 2 O3(g) 3 O2(g) A. [O3]2 = [O2]3 B. Kc[O2]2 = [O3]3 C. [O3] = [O2] D. Kc[O3]2 = [O2]3 E. Kc[O2]3 = [O3]2

69. ## nuclear physics

Calculate the age of a plant sample that shows about one-eighth of the carbon 14 of a living sample. The half-life of carbon 14 is about 5760a How do you do this?

70. ## English 2 Animal Farm

Animal Farm is replete with subtle and not so-subtle lessons on blind conformity and the misuse of power.Discuss the importance of education of the masses,knowledge of history, idealist thought and class structure as represented in the novel. At the same

71. ## Chemistry

A blood serum sample containing Na+ gave an emission signal of 4.27 mV. A small volume of concentrated standard Na+ was then added to increase the Na+ concentration by 0.102 M, without significantly diluting the sample. This "spiked" serum sample gave a

72. ## Chemistry

If performing a potentiometric halide titration with Ag+: 1. Is siver nitrate a primary standard? Explain. 2. What is the purpose of using a bisulfate buffer? 3. Have 1.0000 grams of unknown, containing .3000g KCl and .7000g KI. You dissolve in 100 mL of

73. ## Chemistry

Glycine amide hydrochloride (BH+) FM 110.54, pKa 8.20 Glycine amide (B) FM 74.08 b.) How many grams of glycine amide should be added to 1g of glycine amide hydrochloride to give 100ml of solution with pH 8? I tried using the henderson-hasselbalch equation

74. ## algebra

robs tractor is just as fast as lucy's. It takes rob 2 hours more than it takes lucy to drive to town. if rob is 80 miles from town and lucy is 60 miles from town, how long does it take lucy to drive to town?

75. ## maths

how many millilimeters are in 1,211

76. ## chemistry

when magnesium and hydrochloric acid reacted, (rate of reaction), what would you have to do to express the average reaction rate in terms of mass of magnesium consumed per second and in terms of moles of magnesium reacted per second..thnks..

The data value x = 45 has a deviation value of 12. Explain the meaning of this. The data value x = 84 has a deviation value of -20. Explain the meaning of this.

78. ## Math

The circumference of a circle with radius r is πr2 Is this true?

79. ## geometry

The perimeter of a triangle is equal to 12 inches. The length of the longest side is equal to the sum of the other two sides minus 2. If you add 2 to the shortest side, it will equal the longest side. Find the side lengths.

80. ## Finance

A bank offers your firm a revolving credit arrangement for up to \$85 million at an interest rate of 2.5 percent per quarter. The bank also requires you to maintain a compensating balance of 4 percent against the unused portion of the credit line, to be

81. ## Management Accounting

Monash Company is currently manufacturing part Z911, producing 40,000 units annually. The part is used in the production of several products made by Monash. The cost per unit for Z911 is as follows: Direct Materials \$9.00 Direct Labour 3.00 Variable

82. ## Statistics

A sociologist interested in cultural differences compared women of two ethinic groups on a Role Approval Index (high scores mean high degrees of approval of one's social role). The results are as follows: Ethnic Group A: N = 15 M= 55 S2 = 6.5 Ethnic Group

83. ## Chemistry

Given the equation: 6CO2(g) + 6H2O(l) -> C6H12O6(s) + 6O2(g) What is the minimum number of liters of CO2(g), measured at STP, needed to produce 32.0 grams of oxygen? 1) 264 L 2) 32.0 L 3) 192 L 4) 22.4 L How do I solve?

84. ## English

What century does Romeo and Juliet takes place.

85. ## Organic Chemistry

Why does alcohol have a higher boiling and melting point than other hydrocarbons like alkanes? Is it because of a weak intermolecular force, or the alkyne has low pKa.

86. ## chemistry

give the oxidation number of nitrogen in the following: 1. NH2OH 2. N2F4 3. NH4+ 4. HNO2

87. ## Chem II - Equilibrium

6.75 g of SO2Cl2 was placed in a 2.00L flask. At 648 K 0.0345 moles of SO2 was present. Kc for the reaction SO2Cl2 SO2 + Cl2 is _____ 3.83 x 10 -2 4.71 x 10 -3 1.12 x 10 -2 6.12 x 10 -4 Ok, on this one, I think I am missing something. Don't I need Kc if I

88. ## Chem II - Equilibrium

3.9 moles of NO and 0.88 moles of CO2 are allowed to react as NO + CO2 NO2 + CO At equilibrium 0.11 moles of CO2 was present. Kc for the reaction is _____ 0.27 1.7 3.14 6.03 Don't you need to know how many liters, to figure Kc don't you have to change

89. ## Chem II

The equilibrium constant of a reaction is 12.6. If the rate constant of the reverse reaction is 5.1 x 10 -2 the rate constant for the forward reaction is _____ 0.32 0.16 0.64 0.08 I don't even know where to start on this question. Any direction will help

90. ## Chem II

The rate constant for a reaction at 305.0 K is two times the rate constant at 295.0 K. The activation energy of the reaction is ______ kJ mol

91. ## Chem II

What mass of ethanol must be added to 10.0L of water to five a solution that freezes at -10.0 degrees C. Assume the density of water is q.00 g/mL. Kf of water is 1.86 degrees C/m.

92. ## ECONOMICS

Willy’s widgets, a monopoly, faces the following demand schedule (sales of widgets per month): Price

93. ## Math

Events related to the Poisson process can be often described in two equivalent ways: in terms of numbers of arrivals during certain intervals or in terms of arrival times. The first description involves discrete random variables, the second continuous

94. ## Statistics

Let X be uniform on [0,1/2] . Find the PDF fY(y) of Y=X/(1−X) . For 0≤y≤1 : fY(y)=

95. ## statistics

Suppose that Θ , X1 , and X2 have zero means. Furthermore, Var(X1)=Var(X2)=Var(Θ)=4, and Cov(Θ,X1)=Cov(Θ,X2)=Cov(X1,X2)=1. The LLMS estimator of Θ based on X1 and X2 is of the form Θˆ=a1X1+a2X2+b . Find the coefficients a1 , a2 , and b . Hint: To

96. ## statistics

As in an earlier exercise, we assume that the random variables Θ and X are described by a joint PDF which is uniform on the triangular set defined by the constraints 0≤x≤1 , 0≤θ≤x . a) Find an expression for the conditional mean squared error of

97. ## biology

Write down the primer sequence, starting at position 5 of the following sequence, assuming it is 10bp in size. Also write down the 5’ end. 5' -ATGCCGATGTAGGGCGGGATGGAGAGATAGAGAGAGTCACAAT-3' where should I start writing.

98. ## Calculus

Let n be a positive integer. Find g'(0), where g(x)=(1-x)(1-2x)...(1-nx). (Note: The answer is in terms of n.) I hope someone can help me, please. Thank you so much!

99. ## math

A scientist calculated the mean and standard deviation of a data set to be and . She then found that she was missing one data value from the set. She knows that the missing data value was exactly 3 standard deviations away from the mean. What was the