# Questions Asked onJune 8, 2011

1. ## chemistry

When 3.761g of a hydrate of strontium chloride is heated to 60 degree C it forms strontium chloride dihydrate of mass 2.746g What is the formula of the original sample?

2. ## physics

3. A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage

3. ## chemistry - hess's law (check + help)

31. Carbon monoxide reacts with hydrogen gas to produce a mixture of methane, carbon dioxide, and water. (This mixture is known as substitute natural gas.) 4CO(g) + 8H2(g) → 3CH4(g) + CO2(g) + 2H2O(_) Use the following thermochemical equations to

4. ## Chemistry

The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18 (l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)

5. ## Chemistry

which is the stronger acid, HIO4 or HBrO4?

6. ## Science: Chemistry - Enthalpy

The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18(l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)

7. ## Algebra

Wk 6 Sec 12.7 #24 World population growth In 2008 the world population was 6.7 billion and the exponential growth rate was 1.14% per year. A.Find the exponential growth function B.Predict the world’s population in 2014 C.When will the world’s

8. ## URGENT math rate of change

What is the horizontal change between the points (-2, 5) and (4, 10)?

9. ## chemistry

determine half life of krypton-92 if only 6.0 millograms of an original 96.0 sample remains unchanged after 7.36 seconds

10. ## Chemistry

The following volumes of 0.000300 M SCN are diluted to 15.00mL determine the concentration of SCN in each sample after dilution. Sample 0.000300 M SCN(ml) SCN (M) 1 1.50 2 3.50 Can someone please explain how to do this?

11. ## Chemistry

how many grams of each species will be present at the end when 0.500g of copper is added to 2.500g of AgNO3? Cu(s) + 2 AgNO3(aq) --> 2 Ag(s) + Cu(NO3)2 (aq)

12. ## Math

An initial investment of \$1000 is appreciated for 8 years in an account that earns 9% interest, compounded annually. Find the amount of money in the account at the end of the period

13. ## quantitative analysis

The city of New Berlin is considering making several of its streets one-way. What is the maximum number of cars per hour that can travel from east to west?

14. ## physics

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of

15. ## physics

5. An object is 30.0 cm to the left of a convex lens with a focal length of +8.0 cm. Draw a ray diagram of the setup showing the location of the image. Calculate the distance of the image from the lens. Is the image upright or inverted?

16. ## chemistry - enthalpy change and finiding volume of

29. Consider the following chemical equations and their enthalpy changes. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = −8.0 × 102 kJ CaO(s) + H2O(_) → Ca(OH)2(aq) ΔH = −65 kJ What volume of methane, at 20°C and 100 kPa, would have to be combusted in

17. ## math

katie makes 70% of her shots from the free throw line . can you determine how many consecutive free throws she must make in order to increase her precent. explain

18. ## science

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of

19. ## Chemistry - enthalpy of combustion(help!!!)

i need help with the below question, i have tried answering it, but do not know where to go after the equations, please start me off on how to find the enthalpy of combustion of at least one.... Consider methane, CH4, and hydrogen, H2, as possible fuel

20. ## Algebra

what's the square root of 7/25? How do I figure it out? I don't think I can simplify the 7, but the 25 becomes a 5? but it wouldn't be 7/5?

21. ## Math

If \$ 2500 is invested in an account that pays interest compounded continuously, how long will it take to grow to \$ 5000 at 3%? Round to the nearest tenth

22. ## Chemistry

With the initial concentrations of [SCN]= 0.0005 M, [Fe3+]= 0.000698M, and [Fe(SCN)2+]=0.000M, determine the value of k if the [Fe(SCN)2+] at equilibrium is 0.0000866M. Fe3+(aq) + SCN (aq) = Fe(SCN)2+ (aq)

23. ## Calculus

A car passes by a certain point at time t = 0 hours heading east at 40 miles per hour. At t = 1 hour another car passes by the same point heading north at 50 miles per hour. What is the functiuonthat equals the distance between the two cars?

24. ## chemistry - electron configuration(check)

is the below the correct electronic configuration for arsenic? Arsenic:[Ar]4s23d104p3

25. ## physics

A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance? Specific Heats of Selected Substances ______________________________________ Substance C [J/(kg•K)] Water (ice-)2,060 Iron-450 Aluminum-897

26. ## Chemistry

Is the following reaction spontaneous at 25*C? delta s reaction = -217 J/K*mol delta H rxn = -1202 KJ 2Mg (s) + O2 (g) -> 2MgO (s) delta suniverse = delta s system - delta H system / T i got positive (+) 3.81 x 10 ^ 3 J/K and my notes says it is

27. ## statistics

1. A researcher is interested in whether students who attend private high schools have higher average SAT Scores than students in the general population. A random sample of 90 students at a private high school is tested and and a mean SAT score of 1030 is

28. ## Statistics

The heights of male students in a given university are normally distributed, with a mean of 70 inches and a standard deviation of .5 inches. Find the height (x value) that corresponds to the z value of -1.33.

29. ## Algebra

Write the equation for this situation: the cost, c, in dollars of a car rental is equal to 10 dollars plus 1/2 the miles driven, m. Then graph the equation and use the graph to determine the cost of the car rental if the number of miles driven is 12

30. ## teacher aides

which of the following is the best statement about children who are abused a]they most often come from impoverised families. b]they cannot usually be identified by thier appearance. c]they will misbehave more often in the class . d]they are usually between

31. ## Statistics

Which of the following values cannot be a probability? 0.5 0.00 0.85 1.00 1.02

32. ## Elementary Statistics

A class consists of 39 woman and 42 men. If a student is randomly selected, what is the probability that the student will be male?

33. ## chemistry - structure and properties (help)

I have a revision question which i do not understand please help me out: 45. Explain the following observations: motor oil pours from a can more slowly than water; however, in a jar, the meniscus of motor oil is flatter than the meniscus of water. The

34. ## Life orientation

Name 2 institutions/community organisations in South Africa involved in supporting or giving redress to enviromental/human factors that cause ill-health,diseases,accidents etc?

35. ## Chemistry - enthalpy and rate constant (check)

22. The rate of a chemical reaction is dependent on its ΔH. Do you agree or disagree with this statement? Briefly justify your answer. I agree with the above statement, enthalpy is defined as the internal energy of the reactants and products therefore the

36. ## chemistry - ionization energy(check + help)

I need help understanding by boron does not follow the ionization trend across the period is lower than the first two elements in the same period, where as it should be higher. has it got to do with the p block having an electron, which makes it easier to

37. ## history

2. Why did European economic practices and financial institutions (trading companies, banks, investments, creation of global markets) weaken Middle Eastern and Asian economies and upset local politics? 3. How did countries or empires in the Middle East and

38. ## Elementary Statistics

A machine has 7 identical components which function independently. The probability that a component will fail is .2. The machine will stop working if more than three components fail. Find the probability that the machine will be working?

39. ## Math

How many grams of saline are needed to make 300 ml of 0.9%(w/v) saline?

40. ## physics work and energy

A basket of neglible wieght hangs from a vertical spring scale of constant force 1500N/m. If you sundally put a 3.0 Kg adobe brick in the basket, find the maximum distance that the spring will stretch. If, instead, you released the brick from 1.0 m above

41. ## physics

4. An 800.0 kg roller coaster car is at rest at the top of a 95 m hill. It rolls down the first drop to a height of 31 m. When it travels to the top of the second hill, it is moving at 28 m/s. It then rolls down the second hill until it is at ground

42. ## economics

what is a 401k

43. ## maths (trigonometry)

calculate the following: 1)sin 50 degree-sin 70 degree+sin 10deg. 2)cos square 48 deg.- sin square 12 deg. 3)tan 20 deg.+tan 40 deg.+root 3 tan 20 tan 40 Plz. Solve these

44. ## Math

a kind benefactor sets up a prize in an international school. the benefactor donates \$10 000. the school invests the money in an account paying 5% interest. if \$750 was paid out annually, for how long can the full prize be given out?

45. ## TEACHER AIDES

which of the following best describes achid who has been abused a]child eager to answer your questions. b]child more mature than other children. c]chid typically forms strong friendships. d]the child may be quiet and tentative. I think its D.

46. ## physics

A ball thrown at an angle of 40 degrees with respect to the ground strikes a building 10m away at a height of 3m above the ground. The magnitude of the initial velocity is?

XYZ (triangle) has vertices X(-1, 1), Y(3, 9), and Z(6, -2). Determine the coordinates of point W on XY so that ZW is a median of XYZ

48. ## science- chemistry

a mixture containing CaCO3 and CaO only. When 0.3500 g of mixture was ignited and cooled, the wt of mixture was 0.3400 g. Calculate %CaO in original mixture.

49. ## accounting

kindly please help me. B1, G1, and P1 formed a partnership. They agreed that B1 will receive a bonus of 10% of partnership net income. B1 and G1 will receive salary allowances of \$10,000 and \$8,000, respectively, and the remaining income is allocated

50. ## math rate of change

What is the vertical change between the points (100, 5) and (1000, 5)?

51. ## uh manoa

A basket of neglible wieght hangs from a vertical spring scale of constant force 1500N/m. If you sundally put a 3.0 Kg adobe brick in the basket, find the maximum distance that the spring will stretch. If, instead, you released the brick from 1.0 m above

52. ## us history

what challenges face minorities in the united states today? how are minorities dealing with these challenges? I want to understand the question, what does it mean by minorities? - does it mean PEOPLE like ummm immigrants, Latinos, Blacks, or Asians??? and

53. ## Statistics

A bag contains 8 red marbles, 3 blue marbles, and 2 green marbles.

54. ## math

Each year, Cathy invests \$1,200 in her account. The account pays an interest rate of 6.3%. The formula to calculate the balance in her account is B =A(1+ r)n+1- A, where r A is the amount invested per year, r is the interest rate, and n is the number of

55. ## PreCal

Factor Completely: 10y^7 +26y^6 -12y^5

56. ## statistics(best fit line)

I'm trying to graph a set of points with data, and I have been given the equation for the best fit line, but when I graph it, the line doesn't match up with the data. It's either too steep or too low. I think it has to do with my intervals for the x and y

57. ## painting

Joe had eight sections of fence to paint. He painted 2/3 of each section in one hour. How many hours did it take him to paint all the section of the fence?

58. ## English

"The boat is made of paper." Why is the made in the past tense in this sentence? What kind of grammar is this?

59. ## Physics

Heat energy is the energy associated with changes in internal energy. If no phase changes occur, the transfer of heat energy is accompanied by a change in?

60. ## english

Write a journal entry from the perspective of a lusty pirate. What say you to these stuffy Puritans? How is their Puritan lifestyle different from your pirate lifestyle? No pirate journal would be complete without some proper "pirate talk." Visit the

61. ## ANT 101

How does the identification of cultural universals impact our understanding of what it means to be human?

62. ## relativity

A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion is initially at rest (rest mass 135Mev). (a) what are the energies of the photons ? (b) What are the magnitudes of the momenta of the photons (c) How are

63. ## Economics

Risk rate is 2%, expected inflation rate is 3%, what is the nominal interest rate?

64. ## Barkerville

Would you have preferred to mine or to operate a business that supported the miners, if you had been an inhabitant of Barkerville during its gold rush? I would have chosen to operate my own business to support the miners. By choosing to run my own

65. ## socials--Barkerville the Evolution of a town

Would you have preferred to mine or to operate a business that supported the miners, if you had been an inhabitant of Barkerville during its gold rush? I would have chosen to operate my own business to support the miners. By choosing to run my own

66. ## maths (trigonometry)

if cosx-sinx=root 2 sinx, then what is the value of cosx+sinx. How

67. ## physics (special relativity)

A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e). (a) show that the folowing process is dynamically impossible. (b) Explain in detail how this process can be made possible (c) for part b what would be

68. ## OChem

For Extraction using a separatory funnel, what is poured into the funnel first the solution that is to be extracted or the solvent?

69. ## geometry

A right circular cone is made from of a radius of 5 cm, a central angle of 216 degrees, what is the volume of the cone in cubic cm?

70. ## college

Explan a credible and a non cedible websites.

71. ## 6th grade decimal order

I am going to list some decimals. Then I need to know if the order is correct from least to greatest. .55 , .678 , .434 and .8 Is the correct order: .434 , .550 , .678 , .8

72. ## Math

the question i need help with is: Classify the random variable as finite discrete, infinite discrete or continuous. The random variable given is the number of hours a child watches television on a given day.

73. ## science

a suitcase as sides of 75cm long by 25cm wide and 50cm high what will its weight be in newtons?

74. ## Statistics

The probability of an event can be negative, positive, or zero?

75. ## HELPPP!! rate of change

The points (-1,2) & (4,y) have a slope of -4/5. What is the y coordinate for (4,y).?

76. ## writing

In your post, summarize the major similarities and differences between the forms of drama, poetry, and the short story. Demonstrate your ideas with textual examples from the course readings. In your response, include at least one example of each literary

77. ## Social Studies

What does "Maya" mean? Is "Maya" a country? Are the Mayans still alive or aare they extinct? Where did they live?

78. ## calculus

find dy/dx implicit differentiation x^2y+y^2x=0 at x=-2, x=2

79. ## Geometry

Find The coordinates of G'reflected in the x-axis if the coordinates of G are (4,-3)

80. ## Geometry

A floor measures 19' by 16'. There is a rug centered on the floor with a 2'border all the way around the rug. If the carpet cost 415.00 per square yard, find the cost of the rug. Remember: convert yards to feet.

81. ## geometry

A box is filled with 6 cans of tennis balls. If the empty space was filled with sand, how much sand will be needed to fill the box? Each can of tennis balls has a radius of 2 in. Height of box is 12in.

82. ## calc

Find a normal vector for a line which is parallel to 5x-6y-15=0 plz explain in steps

83. ## Math

Solve the logarithmic equation. Please show all of your work. Loga(x+4) + loga(x-4) = 4

84. ## Math

Log base 10 of 9 = 0.95. Log base 10 of 2 = 0.30. Find log base 10 of (20/9)

85. ## Random question

Just doing a statistic here...can you name some of your favorite singers? Can be old or new.. Thanks!

86. ## english

Can you start a sentence with As?

87. ## chemistry

The formula of benzine and organic solvent is C6 H6. what is the empirical formula express the mass of a mole of materials in gram

f(x)=1/3(x+7)^2+4 find the vertex,the line of symmetry, and the max or min. value of the f(x) graph the function. thank you in advance :)

89. ## Chemistry

Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to escape the gravitational attraction of the earth. What would be the kinetic energy in joules of a satellite weighing 2337 lb that

90. ## math

I just don't understand the geometry behind this! How is theta 1 in red equal to theta 1 in black? And same with theta 2? I need to figure out the angles to solve the rest of my problem, but I am already stuck in figuring out how these angles are the same.

During the early 1860s, what economic and social problems might have existed in Barkerville? People who had money could go off and afford more, and those that didn't get anything. have i got it right?

92. ## statistics

Suppose that a random sample of 350 current customers results in 195 customers with a response of 9 or 10 representing customer delight

93. ## maths (trigonometry)

if sec x +tan x=p, then tan xeuqalto what. How?

95. ## us history

why did the Vietnam war last so long?

96. ## Elementary Statistics

A manager needs to fill three positions, computer softer engineer, team-leader, and test engineer. The manager finds 5 applicants that qualify for all three jobs. How many different ways can the manager place those 5 people into the three possible

97. ## Math-Calc

The lim as x goes to 0- for cos(x)/sin(x). I know the answer is negative infinity but I don't really understand why.

98. ## history

How did European explorations and commercial activities in the early modern period affect regions of the Middle East and Asia?

99. ## Chemistry

How do you balance the equation when citric acid is added to NaOH?

100. ## Math

Larry has 36 sections of wooden fencing. Each section is 6 feet long. He plans on using all the sections to surround a rectangular pasture. What is the area of the largest pasture he could create. How many different size rectangular pastures could he make?

101. ## chemistry

Eva has two containers labeled A and B. The diameter of container A is 8 inches and the diameter of container B is 12 inches. If Eva pours the water from container A into container B, which will occur?

102. ## GEOMETRY

If a building casts a 20 ft shadow and a flagpole casts a 7 ft shadow and the flagpole is 12 ft tall, how high is the building?

103. ## Humanities Core/History

Why are people including scholars, artists, political activist interested in interpreting the rock art of the western cape?

104. ## geology

I need help finding historical disasters associated with past earthquakes

105. ## maths (trigonometry)

what is the identity of A raise to 4+b raise to 4

106. ## medical information management

According to a December 4 hospital census of 100,what are the total inpatient services days for December 5? Admissions 10 Discharges 2 A&D 1 A.90 B.109 C.100 D.110

107. ## english II

How does prewriting affect the success of an essay?

108. ## Math

The points (0, -5) and (x, y) have a slope of 0. What could be the coordinates of the point (x, y)?

109. ## math rate of change

The points (-1,2) and (4,y) have a slope of -4/5. What is the y- coordinate of the point (4,y)?

Construct an example of two Riemann integrable functions whose composition is not Riemann integrable.

111. ## Statistics

If one of the 467 men is randomly selected, what is the probability of getting either an occasional smoker or a regular smoker?

112. ## Math

Find the slope of the line passing through the points (10, 0) and (0, 3). -10/3 10/3 3/10 -3/10

113. ## Algebra

The function g is defined below. g(x)=((x)^(2)-9x+14)/((x)^2-11x+24) Find all values of x that are NOT in the domain of g. If there is more than one value, separate them with commas.

114. ## English

In the sentence,"She sat down and watched."is down an adverb?

115. ## English

Could you please check these sentences? Thank you very much. 1) Finally, an albatross came through the fog and was greeted as if it had been a Christian soul. 2)The albatross ate food it had never eaten before and flew round the ship . The ice split as the

116. ## physics

Find the thickness of a aluminum matal in between glass. if a light of 550nm is shined onto glass which makes 31 black lines . with black lines on the edges.

117. ## College Algebra

Write the following as an radical expression. v^(4/5)

118. ## Math

Larry has 36 sections of wooden fencing. Each section is 6 feet long. He plans on using all the sections to surround a rectangular pasture. What is the area of the largest pasture he could create

119. ## physics

if an object has a mass of 17 kg what is approximate weight on earth

120. ## child care

A strategy for health promotion among infants, toddlers, and young children focuses on educational programs, physical, fitness, activities and.. A. family panning B Tabacco, alcohol,anddrug use. c. Nutrition D mental health and mental disorders. Im not

121. ## algebra

write slope intercept equation for the line containing the given pairs of points (-3.4) and (3,1)

122. ## math

Canada, venezuela, kenya, france and new zealand, are qualified to compete in a final event of the olympics games. suppose that new zealand withdrawn from the event and canada has two athletes entered in the event. 1. what is the probability that canada

123. ## calculus

Largest 5 dizit number exactly divisible by 32 ?

124. ## science

a 3.250 g sample of petroleum fraction was ignites in a Parr bomb under a 20 atm pressure of O2. all the sulfur was converted into SO3 and upon addition of water H2SO4 was formed. The SO4 was completely precipitated by addition of BaCl2, abnd precipitate

125. ## Algebra

Simplify 1x2−4+25x−10.

126. ## English

Can you start a sentence with from? Also, is this sentence grammatically correct: Going to the park involved walking the dog, meeting people, and exercising, all of which I loved.

127. ## Algebra

Find the equation of the line given pair of points. (2,5) and (6,6) Y=?

128. ## English

I need to use to suggest me a site with information on the German concentation camps and the holocaust (vey easily explained). It is designed for English learners at an intermediate level.

129. ## medical coding

according to a December 4 hospital census of 100,what are the total inpatient service days for december 5? admissions 10 discharges 2 A&D 1 A.90 B.109 C.100 D.110

130. ## us history

did antiwar protests help or hurt the united states during the Vietnam War? i have no idea!!

131. ## Algebra

I need helop!A lawn a company charges an initial fee of \$200.00 plus \$50 per hour for labor costs. If h represents labor hours and c represents the cost what is the total cost equation and how do I work this out step by step, I need to understnad this!

132. ## Trigonometry

Find cos⁡(76n). Find sec⁡(23n)

133. ## calculus2

Find two non-Riemann integrable functions whose sum is not Riemann integrable.

134. ## Math

Find the slope of the line passing through the points (10, 0) and (0, 3). -10/3 10/3 3/10 -3/10

135. ## HELPPP!! math

HELLP!! Can someone help me solve for y in this equation.? -4/5 = (y-2) / (4- (-1))

136. ## math

i have a HUGE math test tomorrow, And I need some help on Factoring. Any websites that will give me good tutorials? I've found some but its total bs.

137. ## Music

How to play the pipe organ

139. ## hawthrone

if an object has a mass of 17 kg what is approximate weight on earth

140. ## science

when any spot on the surface of the earth faces the sun that spot is dark and it is night

141. ## Com

Does anyone on here use Writepoint to check your work??

What is motivating theory

143. ## algebra 1

Simplify the expression: 14/(3x) + (x+5)/(3x)

144. ## algebra

3a to the 4th power minus 243

145. ## algebra/trig

1.Find the domain f(x)=ã(x^(2)-9) 2. Find all six trig functions for (-3,4)

146. ## maths (trigonometry)

1+sin a- cos a/1+sin a +cos a eual to ?. How?

147. ## Math

In triangle ABC, angle C is a right angle. Find the measure of angle B if side b = 105 m and side c = 139 m. 49° 59° 53° 47°

148. ## integrated science

explain pressure relations for air

149. ## science

what have you learned in elementary science with meaning?

150. ## algebra

Solve 2(x-8) ^ 52

151. ## Math

If the Risk Free Rate is 2% and the expected inflation rate is 3%, what is the nominal interest rate? Please show formula.

152. ## math

i need to find a multiplication sentence with a 3 digit number that does not require regrouping....

153. ## Math

x + y = 26000 .06x * .03y = 1080 x =

154. ## URGENT math rate of change

The points (-1,2) & (4,y) have a slope of -4/5. What is the y coordinate for (4,y).?

155. ## Applied Physics

The weight density of a quart of oil is 56.9 lb/cubic foot. The weight of the oil is 1.90lb.