# A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.72 kg m-3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room

13,119 questions, page 60
1. ## Chemistry

I had to perform an experiment for rate of reaction. The point of the experiment was to show how changes in reactant concentration, temperature, and catalyst presence can affect the rate of a reaction. The reaction that we studied was H2O2 + 2I^- + 2H^+ ->

asked by Hannah on February 25, 2012
2. ## Chemistry (Ksp and Solubility)

Kindly answer my query as early as possible.Please solve the complete question A solution contains 0.01M Ag+ and 0.001M Ba+2 . ksp of Ag2CrO4 = 2.4*10e-12 ksp of BaCrO4 = 1.17*10e-10 A solution of K2CrO4 is added to this solution. Which will precipitate

asked by Bilal Asif on November 8, 2015
3. ## Physics

The Place you get your haircut has two nearly parallel mirrors 5.0m apart. As you sit in the chair, yoru head is 2.0 m from the nearer mirror. Looking toward this mirror, you first see your face and then, farther away, the back of your head. ( The mirrors

asked by EM on March 7, 2010
4. ## AP Chemistry

(a) When 300.0 milliliters of a solution of 0.200 molar AgNO3 is mixed with 100.0 milliliters of a 0.0500 molar CaCl2 solution, what is the concentration of silver ion after the reaction has gone to completion? (b)Write the net cell reaction for a cell

asked by Jessica on April 5, 2010
5. ## Math

Each of the following objects have been measured with inappropriate units. Convert them to more suitable units. (Please check my work and see if the units are correct for the situation?) a) The thickness of a dime is 0.00122m 0.00122m*100cm/1m = 0.122cm b)

asked by Bree on July 18, 2014
6. ## Chemistry

SO2(g) + NO2(g) SO3(g) + NO (g) At a given temperature, analysis of an equilibrium mixture found [SO2] = 4.00 M, [NO2] = 0.500 M, [SO3] = 3.00 M, and [NO] = 2.00 M. (a) What is the new equilibrium concentration of NO when 1.50 moles of NO2 are added to the

asked by Andre on May 11, 2009
7. ## Environmental science

Estimate the chronic daily intake of 1,1,1-trichloroethane from exposure to city water supply that contains a 1,1,1-trichloroethane concentration equal to the drinking water standard of 0.2 mg/L. Assume the exposed individual is a child who consumes water

asked by Jazmin on February 16, 2011
8. ## Biology

Consider the observations you made working with the Paramecium Homeostasis Gizmo. Identify a question about the relationship between the water solute concentration and the number of contractions of the paramecium’s vacuole in a specified number of

asked by Cindy kimberely on September 4, 2018
9. ## chem

PCL5=PCl3+Cl2 a. Initially 0.72 mole PCl5 are placed in 1.50 L flask. At equilibrium, there is 0.16 mole PCl3 in the flask. What is the equilibrium concentration of the PCl5? b. What is the equilibrium concentration of the Cl2? c.What is the equilibrium

asked by chemdummy79 on November 19, 2012
10. ## Math in Science

Estimate the thickness of plant matter that produced a bed of coal 0.6 m thick. About how much coal would have been produced from a layer of plant matter 0.50 m thick.

asked by Zoe on October 5, 2015
11. ## Science

What is the probable relationship between rebound centers and locations where ice accumulates? What is the probable relationship between rebound centers and thickness of ice in Canada?

asked by Christopher on May 12, 2010
12. ## chemistry

a sample of helium gas has a volume of 6.50L at a pressure of 845mm Hg and a temperature of 25 celcius.what is the pressure of the gas in atm when the volume and temperature of the gas sample are changed to the following: a. 1850 mL and 325K

asked by Jetta on June 27, 2010
13. ## Physics

Imagine that your car is powered by a fusion engine in which the following reaction occurs. 3*deuterium--->helium + hydrogen + neutron The masses are (2.0141 u), (4.0026 u), (1.0078 u) and (1.0087 u). The engine uses 8.1 10-6 kg of deuterium fuel. If one

asked by Jen on June 3, 2011
14. ## chemistry

A student performed two side-by-side reactions to test the decomposition of N2O5. The only difference between the two reactions was reactant concentration — reaction 1 started with 2 M N2O5 and reaction 2 started with 1.2 M. Which of the following

asked by stop-cheating-on-apex on March 17, 2018
15. ## Math

Pay can buy a package of 20 balloons for \$6 or a package of 50 for \$9. How much cheaper is each balloon in the package of 50 balloons?

asked by Brandon on April 8, 2014
16. ## science

an you please solve the questions for me 1. 3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both

17. ## Science

im stuck in some questions in my homework.. thnx in for ur help in advance! 1)What is the process where elements heavier than helium are formed? 2)What type of features are found at subduction zone(convergent boundaries)? ders 4 answers for it.. i already

asked by Tuan on June 5, 2007
18. ## physics

In 5.20 h, a balloon drifts 6.5 km north, 2.00 km east, and 2.76 km in upward elevation from its release point on the ground. (a) Find the magnitude of its average velocity. . km/h (b) Find the angle its average velocity makes with the horizontal. . °

asked by Anonymous on November 28, 2011
19. ## Chemistry

A balloon is filled with hydrogen at a temperature of 20 C and a pressure of 755 mmHg. If the balloons original volume was 1.05 liters, what will the new volume be at a higher altitude, where the pressure is only 625 mmHg? Assume the temperature stays the

asked by Lillie on March 19, 2015
20. ## Pre-Calculus

As a balloon in the shape of a sphere is being blown up, the radius is increasing 1/pi inches per second. At what rate is the volume increasing when the radius is 1 inch? I know that the volume of a sphere = 4/3(pi)r^3 I don't know what to do next. Figure

asked by Corin on May 30, 2007
21. ## physics

A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current ﬂows through a square area of membrane on a

asked by maranda on October 15, 2014
22. ## physics

A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current ﬂows through a square area of membrane on a

asked by Jason on October 15, 2014
23. ## physics

1) Two large vertical plates parallel to each other are 2mm apart. A thin flat plate of 1 mm thickness,0.6 m*0.6 m size and 25 N weight is towed vertically up b/w the two large plates with a velocity of 0.2 m/s. the inside plate is equidistant from the two

asked by sumit on September 2, 2011
24. ## physics

Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. Typically, this disc has a radius of about 2.85 10-2 m and a thickness of about 7.14 10-3 m. The shear modulus of cartilage is 1.16 107 N/m2. Suppose that a shearing

asked by Cat on October 18, 2012
25. ## Physics

Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. Typically, this disc has a radius of about 2.6 x 10-2 m and a thickness of about 1.4 x 10-3 m. The shear modulus of cartilage is 1.2 x 107 N/m2. Suppose a shearing

asked by Mike on November 22, 2010
26. ## Physics Help

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the

asked by Kourt on November 8, 2010
27. ## Physics

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the

asked by Ashley on November 9, 2010
28. ## Physics Help

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the

asked by Kourt on November 8, 2010

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the

asked by Kourt on November 9, 2010

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the

asked by Kourt on November 8, 2010
31. ## Physics

A bullet is fired through a wooden board with a thickness of 12.0 cm. The bullet hits the board perpendicular to it, and with a speed of +370 m/s. The bullet then emerges on the other side of the board with a speed of +333 m/s. Assuming constant

asked by Grayson on January 30, 2015
32. ## physics

A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant

asked by scott on September 11, 2014
33. ## science

HELP FAST!!!!!!!!!!!!!!!! If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called? A. delta point B. distance system C. coordinate system D. reference point

asked by LILY on November 29, 2012
34. ## chemistry

URGENT!! You wish to prepare 1 L of a 0.02 M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution?

asked by Martin on October 11, 2010
35. ## Chemistry

S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y ƒ´ [S2O82ƒ{] Rate = ƒ{ƒn ------------- ƒ´ƒnt Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M

asked by Jude on March 8, 2011
36. ## Math

2. Reed is on the ground looking up at Aaron, who is in a hot air balloon that is 140 ft above the ground. Reed and Aaron are 350 feet apart. What angle is Reed looking up at?

asked by Randy on February 22, 2016
37. ## chem

A sample of gas in a balloon has an initial temperature of 19 ∘ C and a volume of 1.47×103L . If the temperature changes to 63 ∘ C , and there is no change of pressure or amount of gas, what is the new volume, V 2 , of the gas?

asked by dakota on March 18, 2015
38. ## chemistry

A sample of gas in a balloon has an initial temperature of 9.0∘C and a volume of 1.75×103L . If the temperature changes to 80.∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?

asked by joy on November 27, 2014
39. ## physics

An axon is the relatively long tail-like part of a neuron, or nerve cell. The outer surface of the axon membrane is charged positively, and the inner surface is charged negatively. The membrane itself has a dielectric constant k ~ 5 and a thickness d ~

asked by edd on February 11, 2010
40. ## Physics

A standard DVD has a diameter of 12.0 cm, and a hole that is centered on the axis of symmetry and has a diameter of 1.50 cm. The DVD’s thickness is 1.2 mm, and it's mass is 17 g. If a (very thin) pin extending through the hole of the DVD suspends it in a

asked by Mustafa on July 9, 2016
41. ## PHYSICS

The average kinetic energy of an atom in a monatomic ideal gas is given by KE=3/2kT, where k=1.38*10^-23J/K and T is the Kelvin temperature of the gas. Determine the de Broglie wavelength of a helium atom (mass=6.65*10^-27kg) that has the average kinetic

asked by Elaine on April 29, 2008
42. ## physics

A small boy blows a big soap bullet at a birthday party where the room is illuminated with yellow light of wavelength 600 nm. a) What is the colour of the soap bubble? Give reasons for your answer. b) Estimate the thickness of the soap bubble. [Refractive

asked by aiman on August 14, 2015
43. ## chemistry

Transfer the tablet to a clean 125-mL Erlenmeyer flask. Add 10-mL of 1M NaOH and heat the mixture to a gentle boil. Once the solution has cooled to room temperature, transfer it to a 100-mL vol. flask. Using the diluted solution from the 100-mL volumetric

asked by eng on January 31, 2010
44. ## chemistry

n order to determine the concentration of bivalent nickel in environmental samples we can use the complexometric titration. A 100 mL sample containing Ni2 + was treated with 50 mL of 0.02 mol / L EDTA solution complexing all Ni2 + solution and leaving an

asked by wallace on August 30, 2018
45. ## physics

You are in a hot-air balloon that ascends at a constant velocity of 2.00 m/s. When the ballon is 1000 meters in the air you jump out of it what speed will you hit the ground with? neglect air resistance. I know we use the conservation of mechanical energy

asked by jeff on April 19, 2009
46. ## chem

What Celsius temperature, T 2 , is required to change the volume of the gas sample in Part A (T 1 = 19 ∘ C , V 1 = 1.47×103L ) to a volume of 2.94×103L ? Assume no change in pressure or the amount of gas in the balloon.

asked by dakota on March 18, 2015
47. ## MATHS help plizzz

A spherical balloon is being inflated and its radius is changing at the rate of 2m/minute. When the radius is 4m, find the rate at which the: (a).volume is increasing V= 3/4 pie r^2 (b). surface area is increasing A = 4 pie r^2

asked by -Minx- on August 17, 2011
48. ## Math

An object is dropped from a balloon from a height of 500m. (a) How long does it take to reach the ground? (b) If the object has an initial velocity of 12m/s, how long does it take to reach the ground? How far will it fall in 5 secnds?

asked by CeCe on December 7, 2014
49. ## College Physics

A charged particle travels undeflected through perpendicular electric and magnetic fields whose magnitudes are 4000 N/C and 20 mT,respectively. Find the speed of the particle if it is a proton. v= m/s Find the speed of the particle if it is an alpha

asked by Lanise on February 19, 2010
50. ## Chemistry

Help me with this; For the second part of the analysis,you will be provided with hydrated crystal of oxalic acid (H2C204. 2H2O). weigh out accurately about 1.575g of oxalic acid in a weighing bottle. Dissolve the acid in a beaker, then transfer the

asked by Henry on June 17, 2018
51. ## English

Please help i need to put this sentences in order and combine them in order to make sense. 1. The pizza sits on the table. 2. It is fresh from the oven. 3. It is in the middle of the table. 4. Its crust rises up. 5. The crust is thick. 6. The crust is

asked by Lily on November 27, 2012
52. ## Chemistry

When the rate of the reaction 2NO+O2=2NO2 was studied, the rate was found to double when the O2 concentration alone was doubled but to quadruple when the NO concentration alone was doubled. Which of the following mechanisms accounts for these observations?

asked by Anonymous on March 14, 2014
53. ## physics

two cars weighing 1500 kg are made to collide with a wall.the initial and final velocities are 15 m/s and 2.6 m/s.if the collision last for 0.15 seconds,then find impulsive force exerted on the car

asked by za on June 7, 2013
54. ## Physics

The heating element in a George foreman grill is plugged into a 120-V wall socket, and 1 C of charge passes through it every 0.09 s. What is its power output, and what is the electrical energy being converted into?

asked by Emily on March 25, 2015
55. ## Physics

The heating element in a George foreman grill is plugged into a 120-V wall socket, and 1 C of charge passes through it every 0.09 s. What is its power output, and what is the electrical energy being converted into?

asked by Emily on March 25, 2015
56. ## Algebra

A rectangular pig pen is made of 84 meters of fencing on three sides. The fourth side is a barn wall. Find the dimensions and greatest possible area of the enclosure.

asked by Gabby on January 15, 2016
57. ## physics

two cars weighing 1500 kg are made to collide with a wall.the initial and final velocities are 15 m/s and 2.6 m/s.if the collision last for 0.15 seconds,then find impulsive force exerted on the car

asked by z on June 6, 2013
58. ## physics

two cars weighing 1500 kg are made to collide with a wall.the initial and final velocities are 15 m/s and 2.6 m/s.if the collision last for 0.15 seconds,then find impulsive force exerted on the car

59. ## Biology

Respiratory system questions? How could expiration be aided by thoracic and abdominal wall muscles? why does a throat infection cause your voice to produce lower pitched sounds?

asked by Sam on November 12, 2009
60. ## General Chemistry

What is the concentration in ppm of Ag in a 245 lb of Ore that contains 83.5g of silver?

asked by MJ on March 23, 2015
61. ## chemistry

what would be the concentration made by dilutin of 45.o ml of 4.2 M KOH to 250. ml

asked by cathy on May 31, 2011
62. ## human risk assessment

What is meant by inhalation reference concentration (RfC)?

asked by Thano on November 2, 2007
63. ## Chemistry

What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.60 × 10-3 M Ag ? The Ksp is 8.46×10–12.

asked by Anonymous on April 25, 2013
64. ## american government

which region of the has the highest concentration who call themselves liberals?

asked by Anonymous on July 7, 2013
65. ## augusta state

What is the final concentration of d at equilibrium if the initial concentrations are a = 1.00 and b = 2.00 ?

asked by e on March 2, 2013
66. ## Chemistry

What equivalent concentration in normality of the following compound. 1mH2sO4

asked by Abdulrahman Auwalu miko on May 30, 2019
67. ## chemistry

What is the pH of a solution with a hydronium ion concentration of 3.5 x 10-4 M? The pOH?

asked by no need on February 13, 2019
68. ## Chemistry

Which solution below has the highest concentration of hydronium ions? pH = 9.82 pH = 12.6 pH = 7.93 pH = 3.21 pH = 7.00

asked by DrewS on March 19, 2013
69. ## Biology

what happens to co2 levels with increasing sugar concentration?

asked by Kelly on June 29, 2010
70. ## chemistry

a 0.01M aqueous NaOH has a hydroxide concentration of ---- M

asked by florence on November 16, 2012
71. ## chemistry

what is the concentration of the hydroxide ion in an acidic solution?

asked by Monique on November 11, 2011
72. ## Chemistry

dilute the concentration of 100mL of KIO3 from 0.5M to 0.0005M

asked by lizette on May 1, 2013
73. ## Chemistry

Calculate the concentration of H3O+ that contains 5.5 x 10 ^-5 moles/L OH- at 25 degrees

asked by Natalie on March 28, 2011
74. ## chem

The concentration unit used in Raoult's Law calculations is???

asked by miley on February 7, 2008
75. ## Ap chemistry

How to calculate initial concentration, preferably with a general example??

asked by Nicole on January 7, 2013
76. ## Bio

Household ammonia has a pH of 11, therefore its H+ concentration is how many times less than a solution with a pH of 7?

asked by Ananymous on February 3, 2014
77. ## Chemistry

Calculate the concentration of OH¯ ions in a 1.4*10^-3 M HCl solution

asked by Sara on February 15, 2011
78. ## chemistry

If the H+ concentration goes from 1.0 x 10-5 to 2.0 x 10-4 moles/Liter what will happen to the pOH?

asked by g on July 10, 2011
79. ## Science

What is the concentration of NH3 in 0.250M solution of NH4Cl?

asked by Jeet shah on March 31, 2015
80. ## chemistry

The pH of a 0.10 M solution of ammonia is 11.1. Find the hydroxide concentration.

asked by Jazmin on February 26, 2011
81. ## chemistry

What quantities are compared when the concentration of a solution is measured?

asked by Lisa on December 26, 2008
82. ## Chemistry

When 46.0 ml of 0.18 M HNO3 and 58.0 ml of 0.23 M LiOH are mixed, the concentration of [OH-] after mixing is ?

asked by Has on January 15, 2016
83. ## chemistry

Calculate the ph for ch3co2h,3% dissociated at a concentration of 0.02 mol dm-3.

asked by kirsten on August 2, 2011
84. ## Chemistry

Why may the absorbance of a filtrate be higher than it's theoretical concentration?

asked by Hannah on August 16, 2015
85. ## Chemistry

What is the % (m/v) concentration of the calcium chloride 1000.00mL

asked by Ruffles on December 4, 2013
86. ## Chemistry

What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.60 × 10-3 M Ag ? The Ksp is 8.46×10–12.

asked by Alyssa on April 25, 2013
87. ## chemistry

The hydrogen-ion concentration of a 0.25 M solution of HCN (Ka = 4.9 ´ 10-10) is I keep getting 1.1 *10^-5

88. ## physiology

what happens to the osmotic pressure with increasing solute concentration

asked by darlene on September 19, 2011
89. ## Chem ap

What is the concentration of cations of a 2 molar CoCl3 solution?

asked by David on February 7, 2013
90. ## chemistry

find the concentration of Pb^2+ in equilibrium with PbBr_2_ and 0.10M Br^-

asked by holly on March 9, 2013
91. ## Chemistry

Can you determine the pH of a 1 liter solution having an H concentration of 1.0*10 to the negative 3.5

asked by Tia on April 28, 2011
92. ## Chemistry

What is the concentration of NO− 3 after mixing? Answer in units of mol/L

asked by Anonymous on May 13, 2013
93. ## chemistry

Calculate the hydroxide ion concentration of a solution with pH = 8.25.

asked by Ciaria on March 11, 2015
94. ## Chemistry

What is the molar concentration of the standard KMn04 soultion?

asked by Gloria on October 23, 2011
95. ## Chemistry

0.0045 M HNO3 calculate the H3O concentration

asked by Caleb on April 24, 2016
96. ## chm

determing concentration by spectroscopy lab discussion?

asked by iqra on April 4, 2011
97. ## chemistry

What is the concentration of a solution if the absorbance is 0.66 and the constant (a x b) is 8.2 L/mol?

asked by aaloy on October 1, 2008
98. ## Chemistry

What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

asked by Molly on March 2, 2015
99. ## Chemistry

What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

asked by Molly on March 2, 2015
100. ## Chemistry

What is the osmolar concentration of 1.000M CaCl2 solution

asked by Ruffles on December 5, 2013