Friday
May 6, 2016

# Posts by Sanaya

Total # Posts: 63

Math
Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win \$50. If you draw 3 black cards, you win \$25. For any other draws, you win nothing. (a) Create a probability model for the amount ...
January 29, 2016

Math
Baggage fees. An airline charges the following baggage fees: \$25 for the rst bag and \$35 for the second. Suppose 54% of passengers have no checked luggage, 34% have one piece of checked luggage and 12% have two pieces. We suppose a negligible portion of people check more than ...
January 29, 2016

Chemistry
Please check. HCl: dipole-dipole interaction HF: hydrogen bonding TiCl4: ionic bonding? CsCl:ionic bonding
January 29, 2016

Probability #3
Please check my answers. Thank you! The game of American roulette involves spinning a wheel with 38 slots: 18 red, 18 black, and 2 green. A ball is spun onto the wheel and will eventually land in a slot, where each slot has an equal chance of capturing the ball. Gamblers can ...
January 28, 2016

Probability #2
Baggage fees. An airline charges the following baggage fees: \$25 for the rst bag and \$35 for the second. Suppose 54% of passengers have no checked luggage, 34% have one piece of checked luggage and 12% have two pieces. We suppose a negligible portion of people check more than ...
January 28, 2016

Probability #1
Please check my answers. Thank you! Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win \$50. If you draw 3 black cards, you win \$25. For any other draws, you win nothing. (a) Create...
January 28, 2016

Probabiliy
Another card game. In a new card game, you start with a well-shuffed full deck and draw 3 cards without replacement. If you draw 3 hearts, you win \$50. If you draw 3 black cards, you win \$25. For any other draws, you win nothing. (a) Create a probability model for the amount ...
January 28, 2016

Chemistry
Combusting 44.8L of H2 with 22.4 L O2 (both at STP) results in the formation of 44.8 L of H2O if the reaction is maintained at the same conditions (STP) and goes to completion. Given the heat of formation of water (= -241.8 kK/mol) calculate a) the PV work b) the heat evolved ...
January 26, 2016

Chemistry
I am stuck on b)... Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), ...
January 25, 2016

Chemistry -Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...
January 20, 2016

Chemistry-Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...
January 20, 2016

Chemistry- Dr.Bob
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
January 20, 2016

Chemistry- Dr.Bob!
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
January 20, 2016

Chemistry
Why is the pressure of a gas does not depend on the molar mass of the gas?
January 18, 2016

Chemistry
Calculate the average kinetic energy of 1 mol of hydrogen molecules and of 1 mol of sulfur hexafluoride molecules at 25 degrees Celsius.
January 18, 2016

Chemistry-Dr.Bob
You are at your cabin in the woods. Will you be able to take a hot bath tonight if only 0.1 lb of propane remains in the tank? Explain. My answer: No, I will not be able to take a hot bath. By making assumptions and approximations, I got... energy released for combustion is ...
January 11, 2016

Chemistry-Dr.Bob
Why is gasoline (octane) better than diesal (cetane)?
January 11, 2016

Chemistry-Dr.Bob
Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in energy of a chemical ...
January 10, 2016

Chemistry-Dr.Bob
An unknown piece of metal weighing 100. g is heated to 90.0 degrees Celcius. It is dropped into 250 g of water at 20.0 degrees Celcius. When equilibrium is reached, the temperature of both the water and piece of metal is 29.0 degrees Celcius. Determine the specific heat of the...
January 9, 2016

Chemistry-Dr.Bob, I need you!!!!
You can mix 100.mL of 1.0 M HCl with 100 mL of 1.0 NaOH, both at 25 degree Celcius. The temperature of your calorimeter rises by 5.98 degree C, and its heat capacity is 100 J/degre C. How much energy is released per mol of H2O formed? My answer: 6x10^6 J per mol H2O I think we...
January 8, 2016

Chemistry-Dr.Bob
You can mix 100.mL of 1.0 M HCl with 100 mL of 1.0 NaOH, both at 25 degree Celcius. The temperature of your calorimeter rises by 5.98 degree C, and its heat capacity is 100 J/degre C. How much energy is released per mol of H2O formed? My answer: 6x10^6 J per mol H2O
January 8, 2016

Statistics
Find the interquartile range given these data points: 57,66,69,71,72,73,74,77,78,7879,79,81,81,82,83,83,88,89,94. When I used the TI-84 calculator, I got ... Q1=72.5 Q3=82.5 IQR=Q3-Q1=82.5-72.5=10 But.. When I created a stem and leaf plot I found that Q2= (78+79)/2 =78.5 Q1=72...
January 7, 2016

Statistics
Find the interquartile range given these data points: 57,66,69,71,72,73,74,77,78,7879,79,81,81,82,83,83,88,89,94. When I used the TI-84 calculator, I got ... Q1=72.5 Q3=82.5 IQR=Q3-Q1=82.5-72.5=10 But.... When I created a stem and leaf plot I found that Q2= (78+79)/2 =78.5 Q1=...
January 7, 2016

Calculus
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?
December 7, 2015

Chemistry
Oops.. The subject for this one is calculus, not chemistry
December 7, 2015

Chemistry
Compute the surface area of revolution about the x-axis over the interval. y = x^2, [0, 4] Is it (pi/12)(65^2 - 65)^(3/2)?
December 7, 2015

Chemistry-Dr.Bob
What is the increasing dipole moment for CO,CS, and SiS? My answer: SiS<CO<CS Is this correct?
December 7, 2015

Calculus
How do I integrate sqrt of (1+e^(2x)) if doing u-sub.. u=sqrt of (1+e^(2x)) and ten using partial fraction...?
December 6, 2015

Chemistry
Can pi bonds be made from d-orbitals?
December 6, 2015

Chemistry
Name the compound or give molecular formula. 1. Pt(NO2)2 : ? Is it Platinum (II) Nitrite 2. Manganese (II) bromide pentahydrate:? Is it MnBr2 • 5H2O
December 6, 2015

Chemistry
Calculate the frequency of light associated with the emission from n=5 to n=4 in the hydrogen atom. I got -7.41 x10^13 Hz, but the answer would make sense if it is positive... So does this mean that when the electrons jump from n=5 to n=4, energy is emitted, but the energy has...
December 6, 2015

Chemistry
Can pi bonds be made from d-orbitals?
December 6, 2015

Grammar
Is it correct to say.. "This chicken tastes fabulous." Is the word "fabulous" used correctly in this context?
December 5, 2015

Chemistry- Dr.Bob
Why is cis-PCl3F2 polar and trans-PCl3F2 nonpolar?
November 28, 2015

Calculus
How do you integrate (x-r)^2 (1/r) (e^(-x/r)) from the interval negative infinity to positive infinity?
November 27, 2015

Calculus
Integrate e^(-t/r) WITH RESPECT TO dt?
November 23, 2015

Calculus
How do you integrate e^(-t/r) dt?
November 22, 2015

Calculus
How do you integrate e^(-t/r)?
November 22, 2015

Calculus
Integrate x/(6x-5) dx The answer is 1/6 x + 5/36 ln abs (36x-30) + C... But I don't understand why it is 5/36 times ln.. I thought that when you factored out the 5 you would get 5 times ln abs (36x-30)..
November 21, 2015

Calculus
Calculate integral [0, infinity) xe^(-x) dx
November 21, 2015

Chemistry-Dr.Bob
A solution is prepared by mixing 50.0mL of 0.001 M HCl and 10.0 mL of 0.200 M NaCl. What is the molarity of chloride ions in this solution? My work: (0.001 mol/L)((0.05 L)= 0.005 mol HCl (0.200 mol/L)(0.01 L)= 0.002 mol NaCl 0.005+0.002=0.007 mol of chloride ions 0.007mol/(0....
November 20, 2015

Calculus
Integral sign 8x/(x-1) dx Is it 8x+8ln abs (x-1)+C ?
November 19, 2015

Calculus
Evaluate the integral. Problem#1 Integral sign 4dx/[(x+3)(x^2 +3x) Does it matter where A, B, and C is placed over. Is there a particular order? Is it ..... (A/x)+(B/(x+3))+(c/(x+3)^2=4 Or ... (A/x+3)+(B/x)+(C/(x+3)^2)=4 I am confused because I get different answers each time ...
November 19, 2015

Calculus
Evaluate using long division. The integral of x/6x-5 dx How do I divide this?
November 19, 2015

math
Each side of the shaded square is 1 unit. What is the length, width, and area of the figure?
February 4, 2013

math
The perimeter of a rectangle is 38 centimeters. The length is 7.5 centimeters. What is the width?
February 4, 2013

math
The area of a rectangle is 45 square inches. One dimension is 5 inches. What is the perimeter?
February 4, 2013

math
i don't know
October 20, 2012

math
Jenelle has a blue jug and a red jug, both containing water. The blue jug has 4 gallons and 1 quart of water in it, and the red jug has 2 gallons and 2 quarts of water in it. How much water is in both jugs?
November 16, 2011

math
The answer is 8 feet remaining. 11-3=8
November 14, 2011

math
A roll of fabric was 132 inches long. A customer bought 3 feet of the fabric. How many feet of fabric were remaining?
November 14, 2011

math
6lbs,2oz
November 14, 2011

math
Holly ordered 2 pounds and 9 ounces of roast beef and 3 pounds and 9 ounces of ham. How much meat did Holly order?
November 14, 2011

math
November 10, 2011

math
Holly ordered 3 pounds and 11 ounces of roast beef and 4 pounds and 10 ounces of ham. How much meat did Holly order?
November 10, 2011

math
Jennie and Millie are sister gorillas. Jennie is 57 kilograms and 663 grams,and Millie is 113 kilograms and 181 grams. How much do the sister gorillas weigh together?
November 10, 2011

math
60*7=420 420+38=458
November 10, 2011

math
Levi worked in his neighbor's yard for 7 hours trimming the trees. After trimming, he bagged up the trimmings in 38 minutes. How many minutes did he work in the yard altogether?
November 10, 2011

math
14, 522
November 10, 2011

math
A sack of sand measures 21 kilograms and 714 grams,and a sack of yard clippings measures 7 kilograms and 192 grams. How much more does the sack of sand measure than the sack of yard clippings?
November 10, 2011

math
A roll of fabric was 144 inches long. A customer bought 2 feet of the fabric. How many feet of fabric were remaining?
November 10, 2011

finding area
Find the area of each square given s = 3.5yd
March 24, 2011

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