# Questions Asked onApril 19, 2013

1. ## STATISTICS

the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

2. ## chemistry

Baking soda is sodium bicarbonate, NaHCO3, and vinegar is primarily acetic acid, HC2H3O2. When baking soda is added to vinegar, the resulting reaction produces a tremendous amount of gas, as shown in this video. Complete this equation for the reaction of

3. ## STATISTICS

A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

1. Write a function rule for finding the amount of daily pay, p, in the following situation: A bus driver gets paid \$100 each day plus \$0.20 per kilometer, k. (1 point) 100 = 0.20 × k p = 0.20 × 100 × k p = 0.20k + 100 0.20k = 100 + p 4. Write a

5. ## physics

The period of the musical node E0 is 4.85 × 10-2 seconds. What is the frequency of this note?

6. ## Chemistry

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.030 M CH3CO2Na? Assume that the volume of the solutions are additive and that a = 1.8 × 10-5 for CH3CO2H.

7. ## physics

Suppose you walk accross a room of length 9 metres with the velocity of one and a half Km per hour. Express this velocity in m/s and find the time you will take to.move accross the room

8. ## Mechanics:Statics

A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.

9. ## chemistry

Balance the following redox reaction by inserting the appropriate coefficients. H^+ +CrO4^2- +NO 2^- =Cr^3+ +H2O+NO3^-

10. ## St

A manufacturer is interested in determining whether it can claim that the boxes of detergent it sells contain, on average, more than 500 grams of detergent. The firm selects a random sample of 100 boxes and records the amount of detergent (in grams) in

11. ## math

A steel tube has an outside diameter of 15 cm, an inside diameter of 13 cm,and is 3.7 m long. What is the volume of the steel contained in the tube in cubic cm is?

12. ## precalculus

The function A=A0e^(-0.0099x) models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 600 pounds of the material are initially put into the

Hello Dr.Bob. Could you check my work please? I'm not sure if I'm right in how I solved this problem. Which of the following nuclides are most likely to decay via beta decay? A) I-131 B) Pb-206 C) F-18 D) Zr-90 E) Ar-40 I know that nuclides undergo beta

14. ## chemistry

If a solution containing 34.576 g of mercury(II) perchlorate is allowed to react completely with a solution containing 10.872 g of sodium sulfate, how many grams of solid precipitate will be formed?

15. ## Math Help?! 7th grade.

1. Determine which ordered pair is a solution of y = x*2–2. (5, 21), (–5, 24), (–1, –1), (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither.

16. ## Science

Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is

17. ## Chemistry

Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

18. ## Math Geometery

Is this true? It is possible for two rectangles to have the same area without having the same perimeter??

19. ## math

A child’s kite is on top of a straight pine tree. A ladder is placed against the tree and touches the kite. The ladder forms a 45-degree angle with the flat ground. The base of the tree is 9 feet away from the base of the ladder. With only this

6x=12

21. ## Find the avg rate

Find the average rate of change f(x)=x^3-3x+9 (a) from -4 to -3 (b) from -2 to 5 (c) from 5 to 9

22. ## Algebra

Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function

23. ## Math

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

24. ## Math

What is the probability of rolling an even number greater than 2 on a fair number cube? in simplest form

25. ## Animal. Homework

Do male dogs go through heat? My girlfriend asked me to look it up for her school, but neither of us are finding it.

26. ## Algebra

Suppose f(x) is some polynomial such that x−45 is a factor of f(x) . What value of x must be a root of f(x)=0 ?

27. ## physics

Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition was exactly |y⟩. If we run for m+1 additional steps (i.e. total of 2m+1 steps from the initial state), what is the resulting

28. ## algebra

how many pieces of wood each 7 1/2 inches long can be cut from a board that is 45 inches long?

29. ## chem

A hydrogen-oxygen fuel cell operates on the simple reaction given below. H2(g) + 1/2 O2(g) H2O(l) If the cell is designed to produce 1.8 A of current, and if the hydrogen is contained in a 2.9 L tank at 200. atm pressure at 25°C, how long can the fuel

30. ## math

Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

31. ## calculus (gr 12)

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c)

32. ## German

Decide if the following sentence is grammatically CORRECT or INCORRECT. Ich habe meinem Freund einen Film geholt. correct incorrect

33. ## Chemistry

Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

34. ## Algebra 1

1. How many solutions does the linear system have ? 3x - y = 4 -3x + 11y = 2 2. A line passes through the points (6,4) and (5,-3). What is the equation of the line in point-slope form ? a. x - 6 = 7(y-4) b. y - 4 = 7(x-6) c. y + 6 = 7(x+4) d. y - 6 =

35. ## Life orientation

In 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.provide relevant sourses to support your claim

36. ## concept of heatlth

The Ortho Evra contraceptive skin patch can be worn on any of the following places, EXCEPT the

37. ## science

suppose you are standing on a sidewalk . describe your motion relative to the car and the plane

38. ## History

4. What Reagan policy resulted in an increase in the federal budget deficit? *supply-side economics deregulation increased defense spending increased spending on social programs Thank You.

39. ## math

a life insurance agent is to be paid a commission according to the following scheme : 1000\$ in year 1, half the year 1 amount in year 2, half the year 2 amount in year 3, etc. what is the total of the all amounts received by the agent in the first 5 years

40. ## xyz

How large a sample will we need to be able to assert with probability 0. 90 that the sample mean will not differ from the true mean by more then 2.5 units? Assume that it is known from past experience that σ =18

41. ## Science

NEED HELP PLEASE THANK U U R NICE :) Describe how burning fossil fuels has created an imbalance in the carbon cycle. Most people drive cars and heat their homes with petroleum, coal, or natural gas. Why is it important to find alternatives for these

42. ## science

Is the speed of light decreasing? I've heard It is.

43. ## chemistry

two tables containing electron impact mass spectra data are shown. select the molecule that corresponds to the appropriate spectrum A) m/z: 29 57 86 B) m/z: 43 71 86 options for both 3-methyl-2-butanone, 3-pentanone, acetone, benzene

44. ## accounting

Customer relations are usually part of:

45. ## Algebra

Find the specified value of the following functions and state the domain of each one. f(x)=x-11;g(x)=7x^2 (a) (f+g)(5)=

46. ## Life Orientation

Name two community organizations that sre involved in supporting or giving redress to environmental factor

47. ## Chemistry - electron configuration

Hello Dr.Bob. Could you please take a look at the following question? I know the correct answer for it, but I'm not sure how to go about solving it. Which ground state electronic configuration will most readily ionize to a 2 + cation? A)

48. ## Chemsitry

Nitrogen dioxide, a pollutant in the atmosphere, can combine with water to from nitric acid. One of the possible reactions is shown below. Calculate ∆G0 and Kp for this reaction at 25oC and comment of on the spontaneity of the reaction (MUST plot the

49. ## math

If the mean of a certain population is 180 and the standard deviation is 38, what x value corresponds to the z-score of -0.27.

50. ## Science-Chemistry

Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH of the initial methyl

Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function

52. ## Algebra

For the given equation, list the intercepts and test for symmetry. 2+y-121=0 Show tests algebraically

53. ## math

what is the approximate diameter of a 31 in basketball?

54. ## math

what is 1000 [?] 81 [?] 190 = 10

55. ## Statistics

how can I determine weather to reject or fail to reject the following nul hypothosis: let a= o.01, data: s= 3.1, n=55 and H(0) st dev 2.8 and H(1)< 2.8

56. ## Algebra 1

Rena has to pay the first \$100 of her medical expenses each year before she qualifies for her insurance company to begin paying. After paying the \$100 "deductible," her insurance company will pay 80% of her medical expenses. This year, her total medical

57. ## Geometry

One pizza has a diameter twice the diameter of a smaller pizza. what is the rato of the area larger pizza to the area of the smaller pizza?

58. ## Statistics

how can I decide to reject or fail to reject the following null hypothesis? let a= 0.05,data; p=0.69, n=32, test statistic z= 0.09095 H(0);p=0.68 H(1)p>0.68

59. ## Math

I really need help please!! Karen, Gavin, Nasra, and Ali each have a deck of cards. Each student randomly draws a card from the deck. Find the probability of each event. a) each student draws a club. b) Karen draws a red card, Gavin draws a king, Nasra

60. ## algebra

Charlene made the sketch below in order to find the height x of a pole. She positioned a mirror on the ground so that she could see the reflection of the top of the pole. Her height, her distance from the mirror, and her line of sight to the mirror

61. ## Math

Calculate the mass of water in kg and tonne contained in a rectangular tank with the following dimensions: width of 3.2000 metres height of 2.000 metres length of 8.000 metres. (Round answers to 3 decimal places) Answers: l= 8.000 1 tonne= 1000 kg w= 3.200

I wrote the thesis but wat do i make the conclusion be...:( This is my thesis: Aldous Huxley's Brave NEw World and Emily Bronte's, "wuthring heights" describe a major struggle of being an individual again society . in Aldous Huxley's novel "Brave New

63. ## chemistry

How many mL of 0.100M HCl are needed to neutralize 49.0mL of 0.104M Ba(OH)2 solution?

64. ## science

find out the volume of 0.05M HCL requred, in ml,in order to neutralise 0.2M Naoh of 40 ml.

65. ## Math

Find the total surface area of a closed cylinder having a diameter of 1.000 m and 15.000 mm and a length of 12.000 m and 55.000 mm. (Round the answer to 3 decimal places) 1 m = 1000 mm Total surface area= pi*D*h+2*(0.7854*D^2)

66. ## PHI103:

You should read this book. Everybody likes it so it must be good" may commit which fallacy?

67. ## chemistry

A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

68. ## chemistry

what is the change in temperature if 24g of water at 50 degrees C absorbs 985j of heat energy

69. ## chemistry

A gas with a volume of 4.20 L at a pressure of 0.63 atm is allowed to expand until the volume raises to 95 L. What is the new pressure (in atm)?

70. ## Grammar (Ms. Sue)

Complete each sentence, using a nominative pronoun. Identify how the pronoun is used in the sentence. 1). Yesterday, my little sister Jessica and(?) played hopscotch on the sidewalk. 2). It was (?) who drew the hopscotch board with chalk. 3). (?) collected

71. ## physics

a .300 kg piece of metal is heated to 88 degrees celsius and placed in a copper calorimeter with a mass .150 kg which contains .500kg which contains .500 L of water that are both initially at 12.6 degrees celcius. Over short period of time the mixture

72. ## Western Civilization

need a good simple to understand resource to explain why the early 20th Century experienced a surge of changing role of art in society. Will need to define the modern art movement and give examples of individuals, the type of art they created and how they

73. ## english

Which of the following sentences is correctly punctuated? A. The company held it's annual party at the convention center. B. Mr. Jones visited the YMCA before becoming a member. C. The local police asked the F.B.I. to assist with the case. D. Mary

74. ## Social Studies 10

What was the future BC called in the early 1800s? What challenges did George Simpson encounter when he became governor of the HBC in 1826? Compare American and British attitudes toward the Oregon Territory (Similarities, Differences...)

75. ## Grammar (Ms. Sue)

Complete each sentence below, using an objective pronoun. Then, tell how each pronoun is used in the sentence. 1). Skipping rope is a good form of exercise. Some athletes use (?) in their jumping. 2). My sister loves to jump rope. It gives (?) a chance to

76. ## physics

You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity? Explain.

77. ## Probability

If 5 juniors and 4 seniors apply for a job at a school which has 2 openings, what is the probability that 1 junior and 1 senior will be randomly chosen for the job.

78. ## physics

Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor

79. ## physics

How does friction slow down a moving object — for example, a soccer ball?

80. ## Social Studies 10

What was the future BC called in the early 1800s? What challenges did George Simpson encounter when he became governor of the HBC in 1826? Compare American and British attitudes toward the Oregon Territory (Similarities, Differences...)

81. ## Chemistry

Find the pH of each mixture of acids 1) 0.115M in HBr + 0.125M in HCHO2 2) 0.050M in acetic acid + 0.050M in hydrocyanic acid

82. ## physics

Two charges separated by a distance of 1 m exert a 1.0N force on each other. If the changes are pulled to a 3-m separation distance, the force on each charge will be

83. ## arithmetic

a flower floats on the surface of lake water. its level above the lake surface is 5.5 cm. then a sudden gust of wind comes and flower sinks 10 cm far from its original point, what is the depth of lake at the point where the flower was floating

84. ## Life orientation

Suggest 5 recommendation on how to address the environmental problems within your community or any other community within south Africa and globally.

85. ## biochemistry

What is the number of ATP molecules produced by the beta oxidation of eicosanoic acid?

86. ## algerbra

solve the equation step by step list each step along with the property you used during that step -5*1*11*4

87. ## Intrest?

1. Find the total amout if you deposit \$600 at a rate of 5% for 2 years compounded anually. 2. Find the total amout if you deposit \$800 at a rate of 8% for 4 years compounded anually.

88. ## Chemistry

Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

89. ## Math

Ms Perez owns 2 properties in different towns. The 1st property is assessed at \$125,000 and has a tax rate of \$6.35 per 1000 dollars. The 2nd property has the same assessed value, but is taxed at the rate of \$0.00587 per dollar. Derive the solution to the

90. ## Chemistry

What is the (a) molality, (b) freezing point, and (c) boiling point of a solution containing 2.29 g napthalene (C10H8) in 44.6 g of benzene (C6H6)?

91. ## physics

A 1400 kg car traveling at 15.5 m/s to the south collides with a 4100 kg truck that is initially at rest at a stoplight. The car and truck stick together and move together after the collision. What is the ﬁnal velocity of the two-vehicle mass?

92. ## physics

A gasoline engine absorbs 20990 J heat and performs 4166 J mechanical work in each cycle. Find the amount of heat expelled in each cycle. Answer in units of J

93. ## physics

A proton travels with a speed of 3.39×106 m/s at an angle of 56.8 ◦ with a magnetic ﬁeld of 0.305 T pointed in the y direction. The charge of proton is 1.60218 × 10−19 C. What is the magnitude of the magnetic force on the proton? Answer in units of

94. ## sociology

3. If all of a company’s Filipino employees sit together for lunch, sociologists would say they have formed their own __________. (Points : 1) diversified group outgroup ingroup ethic group

95. ## social

__________ experienced the Great Depression

96. ## Algebra 2

Find the sum [1 4] [0 0] [0 3] + [0 0] A - [1 4] [0 3] B - undefined C - [0 0] [0 0] D - [1 0] [4 3]

97. ## college algebra

1.write the formula for the function that has degree 3 and zeros of -1,2 and 5 with a lead coefficient of 1? (leave answer in factored form) f(x)= 2. Write the formula for the function that has degree of 4 and zeros of -4, 3(multiplicity 2) and 4 with a

98. ## statistics

The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?

99. ## Chemistry

A 17.6ml sample of a monoprotic acid is titrated with 0.212M NaOH. If 69.2ml of base is required to reach the equivalence point, what is the concentration of the acid?

100. ## Science speed help

Explain how heat is transferred between a hot and a cold object by conduction — for example, a warm foot on a cold floor.

101. ## bege101

State the distinguishing features of Literature as a mode of language use by citing examples

102. ## Chemistry

The of hydroxylamine, , is . A buffer solution is prepared by mixing 120 of a 0.34 hydroxylamine solution with 60 of a 0.25 solution.Solve for the PH

103. ## Algebra 2 variables

Find the values of the variables. [-12 -w^2] = [2k -81] [2f 3] [-4 3] Show your work?

104. ## Science

An electromagnet is ____. A. a permanent magnet B. made with bar magnets C. able to attract all metal substances D. only operating when the current is on I think it is D..?

105. ## chemistry

Predict the first order splitting patterns of the indicated proton in the following molecules: CH3CH2CH3 (the H in CH2 is selected) a) quintet b) quartet of quartets c)septet

106. ## Life Orientation

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

107. ## math

a two digit number * 7 is multipule by three digit number * * 3 the digit in the place are not neccessararliy the same which of the following can be the product of the two numbers ?

108. ## Algebra

Simplify (√7 + 8)(√63)

109. ## physics

A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20 kilometers/hour. Find the resultant velocity of the plane

110. ## math

the length of the base of a triangle is smaller than its base.the area of triangle is 1/2x^2+2x+3/2.what is he length of he base

111. ## Math Geometery

Is it possible for two rectangles or squares to have the same area, but only if they have the same perimeter??

112. ## math

at a shopkeper advertise buy two get one free what is the discount percent?

113. ## Science

A period of inactivity in the summer months due to the hot, dry weather is called _______ and is a(n) _______ adaptation.

114. ## math

if a+b multiply c=7then c=?

115. ## math

in the given equation find the value of variable m 17m-3/2=5m+14

116. ## Math

The formula y=1+1.4ln(x+1) models the average number of free-throws a basketball player can make consecutively during practice as a function of time, where x is the number of consecutive days the basketball player has practiced for two hours. After how

117. ## Algebra

Evaluate the determinant of the matrix. [-4 5 6 0 4 4 -2 -5 4]

118. ## physics

A rubber chicken of mass 45.0 kg is pulled along a horizontal surface by a rope that makes an angle of 32.0 with the horizontal. If the coefficient of friction is 0.113 and the tension in the rope is 95.0 N, what is the acceleration of the object?

119. ## chemistry

Write the net ionic equation (including phases) that corresponds to Fe(ClO4)2(aq)+Na2S(aq)=FeS(s)+2NaClO4(aq)

120. ## precalculus

the value of a particular investment follows a pattern of exponential growth. In the year 2000, you invested money in a money market account. The value of your investment t years after 2000 is given by the exponential growth model A= 6200e^(0.018(t)). When

121. ## Maths

There are two complex roots to the quadratic equation z^2 +(1−16i)z+(−80+10i)=0 . What is the value of the larger of the two norms of the two roots?

122. ## Maths

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

123. ## Numbers

What is the smallest possible natural number x>5 , that leaves a remainder of 5 whenever it is divided by 14 , 8 or 77

124. ## Math

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

125. ## Ratios

If the ratio of x+y to x−y is 279/262 , then the ratio of y to x can be written as a/b where a and b are coprime positive integers. Find a+b

126. ## real estate finance

The annual insurance premium on Maria Snyder's house is \$2,074 and the annual property tax is \$1,403. If her monthly principal and interest payment is \$1,603, find the adjusted monthly payment including principal, interest, taxes, and insurance (PITI).

127. ## Inequality Sum

x,y and z are positive integers such that x

128. ## Sigma over Phi

Let σ(n) be the sum of the positive divisors of an integer n and ϕ(n) be the number of positive integers smaller than n that are coprime to n. If p is a prime number, what is the maximum value σ(p)/ϕ(p)?

129. ## GEOOOOMETRY!!!!!....Angled Perimeter

ABCD is a quadrilateral with ∠ADC=∠ACD, ∠ACB=∠ABC and CD=7. If triangles ADC and ABC have perimeter 51 and 59, respectively, what is the value of BC?

130. ## P&P

Peter is walking from the library to school at a rate of 40 meters per minute. At the same time, Paul is walking from school to the library. After they meet each other, Peter still needs 6 minutes to get to school, while Paul is 200 meters away from the

131. ## Isoceles Angle Bisector

Triangle ABC is isosceles with AB=AC. D is a point on BC such that AD bisects ∠BAC. What is the measure of ∠ADB (in degrees)?

132. ## math

Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

133. ## Life Orientation

describe the lifestyle behaviour of the youth who abuse illegal and legal drugs and discuss how this lifestyle behaviour impacts the teenager.

134. ## math

Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

135. ## Algebra

Let S be the sum of all values of r such that the coefficient of the x^2 term in the expansion of (x−3)(rx+2)^3 is −6 . If S=a/b, where a and b are coprime positive integers, what is the value of a+b

136. ## math

Evaluate the following limits: (I) Lim. (x+1)/[1-sqrt(4+3x)] X >-1 (II) Lim. (2-3x-5x^2)/(1+2x^2) X >Infinite

137. ## Trigonometry

Let O be the origin and P be a point in the fourth quadrant on the x-y plane. Let 270

138. ## geometry!!!.....Alice's Concession Choices

Alice is at a country fair with 4 concession stands. She cannot decide in which order to visit each concession stand. Assuming she visits each stand once and only once, how many different ways are there to visit all the concession stands

139. ## Trigonometry

Given that tan84=T , how many solutions are there to tanx=T in the domain [0,1000] ?

140. ## Economics(Please check, thank you)

Is leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct?

141. ## chemistry

To what volume should 100ml of any weak acid (HA) with a concentration of 0.2M be diluted to double the percentage ionization?

142. ## statistics

A study found that citizens spend on average \$1950 per year on groceries with a standard deviation of \$100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the

143. ## chemistry

A reaction produced 0.40 mmol of H in a buffered solution which contained 300ml of 0.06M succinate buffer, pH is 4. What was the pH of the medium after the reaction was completed? The pKa of succinate buffer is 4.21

144. ## Math

Find the sum of all primes q

145. ## Chemistry

Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

146. ## Maths

If the quadratic kx^2−14x+1 is a perfect square polynomial, what is the value of k

147. ## English

As I looked at that photograph

148. ## physics

Consider the Hamiltonian H=Z⊗3 acting on 3 qubits. What is the ground energy of the system? (I.e. the lowest eigenvalue of H?) What is the dimension of the ground energy subspace? (I.e. multiplicity of that eigenvalue?) Which of the following correctly

149. ## SCIENCE???????/

a region has a geothermal gradient of 180 ˚C km^-1.what type of metamorphism will occur at a pressure of 1.2×10^8 pa? answer the question by completing the sentence below. In these condition there would be ........??? metamorphism. I would appreciate if

150. ## accounting

features of king code iii

151. ## physics

Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −. Write M in the standard basis. If M is the Hamiltonian acting on a qubit which is in the

152. ## Physics

The Frequency Of an Electromagnetic Wave Is 6x(10x16) What Is IT wavelength In air..?

153. ## math

If you roll a number cube 36 times, how many times do you expect to roll an even number?

154. ## Statics

Two identical spheres of radius 80mm and mass 2 kg on the surface of the earth are placed in contact. Find the gravitational attraction between them.

155. ## Mechanics:Statics

Two 10 kg spheres are placed 500mm apart. Express the gravitational attraction acting on one of the spheres as a percentage to its weight on earth.

156. ## life orientation

what are the impact of teenage pregnancy in the community.

157. ## life orientation

provide five ways in which you critically discuss how life style disease impact on the teenager

How were the workers compensated for their labor in the North and South during 1800 to 1860?

One patern called for 2/3 of a yard of lace, and another pattern called for 5/9 of a yard of lace. In simplest form, how much more lace did the first pattern call for than the second?

160. ## Math

Using a ruler to draw a square with a perimeter of 48ft, and using the scale 6ft=1/2in (Hint: to find the length of each side, divide 48ft by 4). How should this problem look?

161. ## Life orientation

How drugs can impacts on the community

162. ## civics

six inter communal conflicts in nigeria

163. ## Algebra

Simplify the expression 0.2y3+0.3y3+0.1y3 use integers or decimals for any numbers in the expression.

* JJ Thompson * what was he credited for discovering the cathode ray tube? * How does his experiment relate to electrostatics? >>PLease help me!!!! :)

165. ## calculus

Evaluate each of the following. Show all your calculations. f'(3) if f(x)  = x^4 − 3x

166. ## calculus (gr 12)

Evaluate each of the following. Show all your calculations. f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8

167. ## calculus

Evaluate each of the following. Show all your calculations. f" (−3) if f(x)  = 4x^3 − 3x^2 + 2x − 6

Evaluate each of the following. Show all your calculations.  f" (1/3) if f(x) = −2x^5 + 2x − 6

169. ## Chemistry

The structures of NO and NO2 possess similarity to free radicals. How are they similar in electronic terms?

Evaluate each of the following. Show all your calculations.  f" (0) if f(x) = 14x^2 + 3x − 6

171. ## life orientation

give five ways in which the human or environmental problem impacts on the community

172. ## life orientation

give five ways in which the human or environmental problem impacts on the community

173. ## grammar

The song You Are My Sunshine always cheers me up. (1 point)

174. ## Life orientation

In 10-15 lines whaj are 5 ways in which the human or environment problem impact on the community?

175. ## Life orientation

How to address the teenage pregnancy?

176. ## Math

The volume of the triangular prism is 30 cubic units. How do I determine the area of the base in square units?

177. ## Math

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth \$2,600. Five years after it was bought, it was worth \$2,000. If the relationship between number of years past 1998 and value of the

178. ## Science

How to report an experiment of Specific heat of a liquid.

179. ## managerial math

a gift of \$3000 a grew \$7,000,000 in 200 years. At what rate compounded anually would this growth occur

180. ## Science

1. Density is the relationship between ____. (1 point)

181. ## algerba 2

the length of a rectangle is (x-2)squared and the width is (5x+1) what is the perimeter of the rectangle

182. ## Science

Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the release of energy

183. ## SIcene

Three examples of physical change are ____. (1 point) boiling water, a nail rusting, and a melting candle a pond freezing, breaking glass, and a burning candle melting ice, mowing the lawn, and carving a statue applying lipstick, making lemonade, and

Suppose a customer brings a gold bracelet to a jeweler and asks for it to be changed into a gold ring. Which of the following is true? (1 point) The physical property of color will be changed. The bracelet will go through a chemical change. The composition

185. ## social civics

Ambassador (a.) are most often recruited in the United States from the career diplomatic service (b.) have a legislation as their headquarters in a foreign country (c.) perform the same functions but have a higher rank than ministers