1. Chemistry

    You are asked to prepare a temperature bath that freezes at -25 degrees C, using only water and ammonium sulfate. a. How many grams of ammonium sulfate would you need to prepare this bath if you start with 500 grams of water? b. What would the boiling point (degrees C) of this...
  2. Social Studies

    19. Select a new deal program that helped improve the lives of South Carolinians. explain what the program improved and how it helped the people of South Carolina. 20. Explain how rationing affected the people on the home front during World War II. How did this behavior help ...
  3. algebra

    P. 620 #56. Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home size S in thousands ...
  4. Math 209

    Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home size S in thousands of square ...
  5. 8th Grade History

    Can I have these answers checked... 1. Which of The following provides the definition of a nation? A. The Highest elected officials in a country B. The are ruled by an independent government C. A country with defined borders and foreign policy enforced by a military*** D. A ...
  6. Sandy

    Hi, I need some help with this problem: The density of ice is 920 kg/m3, and that of sea water is 1030 kg/m3. What fraction of the total volume of an iceberg is exposed? I took the density of the iceberg divided by the density of the water and multiplied this by 100, but this ...
  7. algebra

    The average gas consuption of Angels SUV is 21 miles per gallon. Jeffs car takes 20% less gas to drive the same distance. If Angel and Jeff drove from Sacramento to Phoenix a distance of 570 miles, how many gallons of gas would each need?
  8. Physics

    Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...
  9. Physics

    Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...
  10. physics

    An ambulance car is going with a speed of 60 km/h, while a car is trying to go around it in a circle with a speed 50 km/h. If the sound that ambulance car emits has a frequency of 1 kHz, which frequency does the driver of the car hear in Hz when the ambulance car is in the ...
  11. Test used to measure prejudice

    I took the Implicit Association Test to measure prejudice. What other test does sociologist use to measure prejudice? I found no further recognized tests to specifically measure general prejudice. You can find assorted tests ( I don't know how reputable) by putting "prejudice ...
  12. Organic Chemistry

    An unknown carboxylic acid has a boiling point of 100 c at 25 torr. Determine its boiling point at 760 torr. I'm given a list to identify an acid that it correlates with. I'm confused as to how I set this up.
  13. Chemistry problem

    What is the expected freezing point of a 3.50 m aqueous solution of BaCl2 (Kfp=1.86C/m)? What is the boiling point (Kbp=0.512C/m? & which is affected to the greater extent, the boiling point or the freezing point?
  14. chemistry

    the accepted boiling point of ethanol is 78.5C. a student takes the temp of a sample of ethanol which is boiling in a beaker on a hotplate. the student reports the temp as 78.5C. is this measurement precise, accurate, both or neither?
  15. physics

    in an emergency stop to avoid an accident, a shoulder-strap seat belt holds a 60kg passengr firmly in place. if the car was initially travelling at 90km/h and came to a stop in 4.5s along a straight, level road, what was the average force applied to the passenger by the seat ...
  16. Calculus

    Water flows into a tank according to the rate F of t equals the quotient of 6 plus t and the quantity 1 plus t , and at the same time empties out at the rate E of t equals the quotient of the natural log of the quantity t plus 2 and the quantity t plus 1 , with both F(t) and E...
  17. math

    A water trough is 4 m long and its cross-section is an isosceles trapezoid which is 210 cm wide at the bottom and 280 cm wide at the top, and the height is 70 cm. The trough is not full. Give an expression for V, the volume of water in the trough in cm^3, when the depth of the...
  18. chemistry

    25 ml of SHW containing CaCO3 1 g/L consumes 12 ml of EDTA. 25 ml of hard water consumes 8 ml of standard EDTA solution. After boiling the sample, 25 ml of the boiled hard water consumes 6 ml of standard EDTA solution. Calculate the total, permanent and temporary hardness
  19. yr 8 design technology

    Systems and Control- inputs ,process and outputs 1) public address system - input ? 2)table lamp - process ? 3) street lamp - input ? 4)burgular alam - process? 5)doorbell-output-doorbell sounds (ding dong is this right?) 6)car windscreen - input-? 7)refrigerater- output- cold...
  20. Algebra 2..

    Automobile Urchasing Preference (Data): *Male American- 58 European- 112 Asian- 46 Total: 216 *Female American- 27 European- 76 Asian-133 Total: 236 Determine: The probability that the person taking the survey was male given that he preferred a European automobile
  21. 7th grade science hypothesis question

    please help me with this challenge question, as i don't quite understand it.: Yolanda makes this hypothesis: "If salt is added to water, then the water will boil at a lower temperature." She sets up and experiment to test her hypothesis, but discovers that it actually takes ...
  22. social studies

    1.How have humans negatively impacted the water system of Arkansas? Select all that apply a.The construction of the MKARNS has resulted in more flooding. b.Chemicals and runoff from industry harm wildlife. c.Too much trade along the rivers damages the banks. d.Sediment from ...
  23. Chemistry

    The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. What would be the boiling point of acetone (ÄHvap = 32.0 kJ/mol) at this elevation? I need to know how to do this!! what formula do u use for this? is it the ...
  24. AP Chemistry

    Which action(s) will decrease the equilibrium concentration of a non-reacting gas in water? 1. decreasing the temp. of the water 2. decreasing the volume of water 3. decreasing the pressure of the gas above the liquid a. 1 only b. 2 only c. 3 only d. 1 and 3 e. 1, 2, and 3
  25. science

    when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant
  26. sociology

    Describe how the role of the family in society has changed traditional has changed? (b)Explain the link between the nuclear family and industrial society? (c)In what ways does the treatment of elderly people differ between moder society and traditional industrial society? ...
  27. physics

    a)Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.6m/s. At the moment the cars are 41.6m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.00m/s2. How long does it take ...
  28. statistic

    One operation of a mill is to cut pieces of steel into parts that will later be used as the frame for front seats in an automobile. The steel is cut with a diamond saw and requires the resulting parts to be within ±0.005 inch of the length specified by the automobile company...
  29. Algebra II

    An air show is scheduled for an airport located on a coordinate system measured in miles. The air traffic controllers have closed the airspace, modeled by a quadratic equation, to non-air show traffic. The boundary of the closed airspace starts at the vertex at (10, 6) and ...
  30. computers

    In a 350 word written paper, using pseudocode, write a program on how you turn a corner in an automobile. Note that there is a stop sign in the intersection. Determine the logical steps involved and write the pseudocode. Consider the following questions when completing your ...
  31. chemistry

    Which of the following statements describes why ion exchange of 99% SiO2 - 1% B2O3 in a salt bath of molten postassium chloride (KCl) is not an effective way to increase the surface strength of the glass sample? The ion exchange works correctly, however both air-cooling and ...
  32. physics

    A heavy table of mass M is vibrationally isolated by being hung from the ceiling by springs, so that its frequency of vertical oscillation is \omega_0 (take \omega_0 to be 2\pi/sec, a typical value). Assume now that the ceiling vibrates vertically with amplitude A at frequency...
  33. Math

    A gardener holds a hose 0,75m above the ground such that the waterfront out horizontally and hits the ground at a point 2 meters away, what is the speed with which the water leaves the hose.
  34. Science

    Assuming all volume measurements are made at the same temperature and pressure, what volume of hydrogen gas is needed to react completely with 3.75 L of oxygen gas to produce water vapor?
  35. Chemistry

    Calculate the mass/volume percent of a NaCl solution in which 182g of NaCl is dissolved in enough water to give a total volume of 4.78L . Would I do 182/4780ml *100?
  36. Math

    An automobile purchased for ​$31,000 is worth ​$2800 after 6 years. Assuming that the​ car's value depreciated steadily from year to​ year, what was it worth at the end of the third​ year?
  37. Chemistry(Please Check)

    You dissolve 6.55 g of potassium nitrate in enough water to make a 250. ML solution. 1.What is the molarity of this solution?answer:0.0262 2.If you took out 15.0 mL of this solution, how many moles of potassium nitrate would you have?answer:0.393 3. What is the percent (m/v) ...
  38. Chemistry

    When given different elements and asked for the highest boiling point, do you figure out the molar mass and pick the highest one as the highest boiling point?
  39. science

    Examples of positive, negative and neutral friction? We always learned about friction as either being positive (tires gripping the road, brake friction for stopping etc.) or negative friction (causing wear or heat as in a bearing or engine due to parts moving against each ...
  40. chemistry

    A sample of an ideal gas at 1.00 atm and a volume of 1.61 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 45.0 atm, what was the volume ...
  41. chemistry

    The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about 100ml of distilled ...
  42. chemistry

    The label of a bottle containing a solution So of hydrochloric acid carries the following indications :hydrochloric acid of density 1190g/l percentage by mass 37%. We introduce a volume V=4.2ml of So in a volumetric flask of volume 500ml containing about 100ml of distilled ...
  43. Econ

    The crowding-out effect arises when: a. govt borrows in the $ market, thus increase % rates and the net investment spending in the economy b. govt borrows in the $ market, thus increasing % rates and decreasing investment spending c. the progressivity of the tax system ...
  44. Chemistry

    The heat of vaporization of benzene, C6H6, is 30.8kJ/mol at its boiling point of 80.1 degrees celsius. How much energy in the form of heat is required to vaporize 102g of benzene at its boiling point? I know that the answer is 24.2kJ but i am not sure how to get this.
  45. Filtration?

    Question: While performing a crystallization, you obtain a light tan solution after dissolving your crude product in hot solvent. A decolorizing step is determined to be unnecessary, and there are no solid impurities present. Should you perform a filtration to remove impurites...
  46. physics

    The heating element of a water heater in an apartment building has a maximum power output of 29 kW. Four residents of the building take showers at the same time, and each receives heated water at a volume flow rate of 12x10-5 m3/s. If the water going into the heater has a ...
  47. Math grade 6

    3rectangular metal blocks,8 cm long, 6 cm wide & 5 cm high, were placed in an empty rectangular glass tank.water was then poured in until it reached a height of 10 cm. Another 5 similar blocks were put into the water so that it reached the brim of the tank. Assuming there was ...
  48. Chem

    A Texas Aggie buys 12 cans of dehydrated water. The cans weigh an average of 63.46g each before the dehydrated water is removed. If the density of pure distilled water is 0.9979 g/mL and each can has a volume of 3.154L, what is the total mass of the cans AFTER the removal of ...
  49. MATH

    a rule of thumb used by car dealers is that the trade in value of a car decreases by 20% of its value each year. suppose the initial value of your car is $23,500. write an equation expressing the trade in value of your car as a function of the number of years from now. if your...
  50. math

    A new temperature scale has the freezing point of water at 50 degrees and the boiling point of water at 125 degrees. Normal body temperature is 37 degrees C and 98.6 degrees F. Water freezes at 0 degrees C and 32 degrees F and boils at 100 degrees C and 212 degrees F. What is ...
  51. physics

    Each of the four wheels of a car push on the road with a force of 4.0*10^3 N [down]. The driving force on the car is 8.0*10^3 N [W]. The fictional resistance on the car is 6.0*10^3 [E]. Calculate the following A) the mass of the car B) the net force on the car C) the cars ...
  52. algebra

    Kevin decides to mix grades of gasoline in his truck. He puts in 5 gallons of regular and 10 gallons of premium for a total cost of $61.30. If premium gasoline costs $0.22 more per gallon than regular, what was the price of each grade of gasoline?
  53. Physics

    A 1125 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 17 km/h. The car now stops, and the four people ...
  54. physics

    A 1175 kg car carrying four 82 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 24 km/h. The car now stops, and the four people ...
  55. physics

    When a 1.3kg mass was attached to a spring, the spring stretched 21cm from its equilibrium position. The mass spring system was then set into oscillatory motion by providing the mass with an initial velocity. Its oscillatory motion is then described by the following equation: ...
  56. Science questions

    Leaving a beaker of water open to the air until it is empty is a phisscal or chemical change ? Heating a piece of calcium carbonate is a physical or chemical change ? Adding copper sulphate to crystal water is it a chemical or physical change? How to seeds disperse and the ...
  57. chemi

    The heat of vaporization of benzene, C6H6, is 30.7 kJ/mol at its boiling point of 80.1 °C. How much energy in the form of heat is required to vaporize 134 g benzene at its boiling point?
  58. Physics

    An automobile tire contains a certain volume of air at 30 psig and 70 °F. The barometric pressure is 29.50 Hg. If due to running conditions, the temperature of air in the tire rises to 160 °F. What will be the gauge pressure? Assume that air is an ideal gas & that the tire ...
  59. chemistry

    About how much should the boiling point of pure water differ from .5m 1m and 1.5m aqueous solutions of NaCl and same molal solutions of CaCl2 Trying to check experimental data from van't hoff factor lab
  60. math

    at the rate of 50 mph a car can travel 14.6 miles for each gallon of gas used. On a trip Mr. Hanson used 12.5 gallons of gas traveling at a speed of 50 mph. the number of miles covered during the trip was:
  61. math/2nd grade

    One box holds 16 crayons. Another box holds 24 crayons. Write a sentence using words that compare the crayons in the two boxes. (not a number sentence 24>16)
  62. Algebra 2..

    a rule of thumb used by car dealers is that the trade in value of a car decreases by 20% of its value each year. suppose the initial value of your car is $23,500. write an equation expressing the trade in value of your car as a function of the number of years from now. if your...
  63. Science

    1.)Which of the following are chemical changes? A.)Boiling Of Water B.)Melting A Cube of ice C.)Dissolving 10 grams of salt in water D.)Splitting water into hydrogen and oxygen 2) What is the mass of water that results from combining 2.0g of hydrogen with 16.0g of oxygen? (1 ...
  64. physics

    Two cars are traveling along a straight-line in the same direction, the lead car at 25.0 m/s and the other car at 32.0 m/s. At the moment the cars are 40.0 m apart, the lead driver applies the brakes, causing his car to have an acceleration of -2.20 m/s2. (a) How much time ...
  65. physics

    Two cars are traveling along a straight-line in the same direction, the lead car at 25.0 m/s and the other car at 32.0 m/s. At the moment the cars are 40.0 m apart, the lead driver applies the brakes, causing his car to have an acceleration of -2.20 m/s2. (a) How much time ...
  66. grammar

    revise the following sentences to eliminate faulty sentence structure, making them clear and grammatically need help with the following sentences: An effective Web site is well designed, provides useful information, and links are given to other relevant sites. To enroll in ...
  67. Physics

    A 4.00 103-kg car has a speed of 9 m/s. The car then hits a tree. The tree doesn't move and the car comes to rest. (a) Find the change in kinetic energy of the car. . J (b) Find the amount of work done in pushing in the front of the car. J (c) Find the size of the force that ...
  68. Chemistry

    Consider the reaction HCHO(g) *) H2(g) + CO(g). 1.0 mol of HCHO, 1.0 mol of H2 and 1.0 mol of CO exist in equilibrium in a 2.0 L reaction vessel at 600C. a) Determine the value of the equilibrium constant Kc for this system. 2.0 moles of HCHO and 1.0 mol of CO are then added ...
  69. chemistry

    hen 9.3 g of an unknown non-electrolyte is dissolved in 50.0 g of benzene, the boiling point the boiling point increased to 81.19 degrees C from 80.1 degrees C. If the Kbp of the solvent is 2.53 K/m, calculate the molar mass of the unknown solute. The answer is 432. I don't ...
  70. Chemistry

    When CH3OH at its normal boiling point, does its entropy increase or decrease? Explain. - My opinion The entropy decreases because there is less order due to the less randomness of gas particles favoured when such an element is boiled not at normal boiling point?
  71. Probability

    Erin's CD changer holds 6 compact disks. Justin uses the random function on to play all the songs randomly. If each of the disks on the changer holds 10 songs, what is the probability has favorite song will be first? If I am getting the hang of this, it's 1/2160 Please help.
  72. spelling

    analogy consonant blend for caught length with word that begins with scr,spr,str or thr
  73. spelling

    What is the correct analogie for these consonant Blend thr spr str scr for whirlwind breeze downpour...
  74. Science - Melting Ice

    In the process of heating ice into the boiling state of its liquid form, did the procass absorb or release energy? Did the molecules spontaneously move fast? Where did the energy come from and where did it go? did it increase or decrease? was it lost? Were the molecules ...
  75. physic

    A mechanic pushes a 2,500 kg car from rest to a speed v, with 5000J of work. During this process the car moves 25m. Neglecting friction, calculate: a) the final velocity of car b) The horizontal force exerted on the car
  76. Physics

    Your car can accelerate at 5m/^2 without a trailer. You add a trailer to your car that has 3 times the mass of your car. At what rate can your car (plus trailer) accelerate now? After accelerating the car travels at a constant speed of 30 m/s. What is the net force acting on it?
  77. Chemistry

    Calculate the molar mass of a compound that raises the boiling point of water to 100.15oC when 40.5 g of the compound is dissovled in 500 g of water. and A mass of 41 g of an unknown nonelectrolyte is dissolved in 429 g naphthalene. The nonelectrolyte lowers naphthalene's ...
  78. physics

    a) what is the density of a log floating in salt water if 42% of its volume is exposed? The density of salt water is 1025 kg/m^3 (b) What is the density of a sample of metal that sinks in water at 7.2 m/s^2
  79. Political Science

    Does the representation system in the U.S. Senate still make sense today? Why or why not?
  80. criminal justice

    Which of the following is an ethical system that does not support using the individual as a means to an end
  81. Health

    2. Which main body system is responsible for breaking down food for energy?
  82. aasu

    how do specific aspects of the us legal system contribite to furthering commerce?
  83. 11th grade

    why do biologists use a classification system to study the diversite of life?
  84. HHS 205

    Can someone assist me in determining The Elements That Should Be Present In An Appraisal System?
  85. social studies

    Describe the apportionment system for state legislative districts.
  86. science

    Identify two advantages of the modern system of symbols used to represent th elements.
  87. Biochem

    Calculate the pH of the buffer system of 0.20M K2HPO4/0.25M KH2PO4
  88. math

    What is the value of x + y in the solution to the system of equations below? x + 8y = 2 y = -0.25x I just need the best explanation so i can do all my other problems cause im confused.
  89. English

    I need help Can u tell me the meaning MEDIA IS THE NERVOUS SYSTEM OF OUR CULTURE plz tell me what it means
  90. business

    which economic system is the best solution to handling a crisis of epic proportion
  91. Health

    the main parts of the central nervous system consist of the brain and the
  92. chemistry

    According to the IUPAC system what is the following compound: CH=C-CH-CH-CH3 (It is not an equal sign but has three dashes up and down instead of two)
  93. math

    Suppose you try to solve a system of linear equations using substitution and get this result. 1. x=-2 2. y=12 3. 6=x 4. -8=-8 5. 7=y 8. 5=3
  94. geography

    what will be a good hook for an essay about ancient india and the caste system? help
  95. Algebra

    What is the number of units in the distance from the origin to the point (-8,6) in a coordinate system?
  96. history

    If Catal huyuk had been built near s major river system, how might life have been different?
  97. Algebra

    Choose all correct answers. Which of the following ordered pairs are solutions of the system, y =x-4 (6,3) (4,0)*** (3,-1)***** (2,-4) Please help
  98. math

    A stereo system is marked down from $450 to $382.50. What is the discount rate?
  99. Math

    What is the number of units in the distance from the origin to the point (-8,6) in a coordinate system?
  100. algebra

    48,000 mililgrams to grams i don't understand the metric system.
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