KB
Popular questions and responses by KB
chemistry
A mixture of carbon and sulphur has a mass of 9.0 g. Complete combustion with excess oxygen gives 22.6 g of a mixture of carbon dioxide and sulphur dioxide. Find the mass of sulphur in the original mixture
asked on September 22, 2011 
Chemistry
Calculate the pH for each of the following points in the titration of 50.0 mL of a 2.7 M H3PO3(aq) with 2.7 M KOH(aq). pKa1 = 1.3 and pKa2 = 6.7 a) before addition of any KOH b) after addition of 25.0 mL of KOH c) after addition of 50.0 mL of KOH d) after
asked on March 11, 2013 
English
Identify the correct sentence. A. In my top drawer is a birthday card from my grandmother and a gold watch from my mother. B. In my top drawer are a birthday card from my grandmother and gold watch from my mother. C. In my top drawer are a birthday card
asked on January 25, 2017 
Chemistry
Calculate the pH at the equivalence point for the titration of 0.200 M methylamine (CH3NH2) with 0.200 M HCl. The Kb of methylamine is 5.0× 10–4.
asked on March 11, 2013 
Math
If John wants to retire with $10,000 per month, how much principal is necessary to generate this amount of monthly income if the interest rate is 15%?
asked on September 11, 2019 
English
__________ Destiny or Caroline sent an RSVP to the invitation? We __________ everyone __________ it to Jake's party. A. Has; hope; make B. Have; hopes; make C. Have; hope; makes D. Has; hope; makes I say C
asked on January 25, 2017 
Chem
What is the longest wavelength of electromagnetic radiation capable of ionizing this hydrogen atom in an excited state? Report your answer in nanometers. Δ𝐸=−2.178×10−18 J(1𝑛2final−1𝑛2initial)
asked on April 30, 2019 
physics
A 45 kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of 1.0 m/s. Her hands are in contact with the wall for 0.80 s. Ignore friction and wind resistance. Find the magnitude and
asked on October 14, 2008 
Math
Find the cost of the monthly rent for a twobedroom apartment in 30 years, assuming an inflation rate of 5% (compounded continuously), if the current rent is $610. (Round your answer to the nearest cent.)
asked on September 11, 2019 
physics
When a water gun is ﬁred while being held horizontally at a height of 1.14 m above ground level, the water travels a horizontal distance of 4.50 m. A child, holding the same gun in a horizontal position, slides down a 34.0◦ incline at a con stant
asked on January 14, 2014 
physics
A mine car, whose mass is 590 kg, rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.95 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to
asked on October 14, 2008 
physics
An airplane is flying horizontally with a constant velocity of 160 m/s at an altitude of 5400 m when it drops a package. How far ahead of the target along the x direction should the plane be when it releases the package?
asked on February 25, 2009 
Math
Find the future value, using the future value formula and a calculator. (Round your answer to the nearest cent.) $864 at 5.5% compounded quarterly for 5 years
asked on September 11, 2019 
physics
When you take a bath, how many kilograms of hot water (48°C) must you mix with cold water (13°C) so that the temperature of the bath is 36°C? The total mass of water (hot plus cold) is 185 kg. Ignore any heat flow between the water and its external
asked on November 17, 2008 
physics
A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant during
asked on November 19, 2008 
math
a recipe calls for 2 1/2 quarts of fish stock and 1 1/2 pounds of shrimp. what is the unit rate of fish stock to shrimp in the gumbo
asked on April 12, 2016 
chemistry
How many joules of energy would be liberated by condensing 49.6 mol of steam at 100.0 °C and allowing the liquid to cool to 30.0 °C?
asked on November 15, 2014 
physics II
the lens to retina distance in the human eye averages 2.0cm what is the power of the lens of the human eye
asked on July 20, 2011 
physics
alpha particles are accelerated through a potential of 1000volts and then enter a magnetic field 0.2T perpendicular to the their direction of motion.Calculate the radius of the circular path that they traverse.An alpha particle has a mass 6.68x 10^27kg
asked on April 6, 2011 
physics
the mass of the water is 131 kg and its initial temperature is 24.2°C, how much energy must the water transfer to its surroundings in order to freeze completely? The specific heat of water is 4186 J/kg·K, and the latent heat of fusion is 333 kJ/kg
asked on August 5, 2014 
physics
a supertanker with a mass of 5.0 x 10 to the 8th power kg accelerates from rest to a speed of 10 m/s in a time of 1000s. what is its average acceleration? how much force is required to accelerate the supertanker?
asked on October 4, 2010 
chemistry
find the maximum value of h2(g)in grams that would be expected to form by reacting 6.54g of zinc with 50ml of 0.1M of HCl.
asked on July 22, 2011 
chemistry
what is the angular momentum quantum number for the orbital from which an Mg atom loses two electrons to form Mg2+ ion.
asked on July 20, 2011 
geometry
A rope is connected to a boat and to the boat's anchor that is resting on the ocean floor at a position not directly under the boat. The rope is 105 feet long and the water is 55 feet deep. To the nearest tenth of a foot, how far is the anchor from a point
asked on October 2, 2008 
Physics
The space between two points
asked on February 22, 2011 
math
need help with "you have $15 in your bank account. you spend $11 on a hat. then you mow 3 lawns for $20 each and deposit the money into your bank account, write and solve an expression (using order of operations) to determine how much money is in your
asked on January 5, 2012 
biology
(Which of the following would least likely induce thirst) a)Dry pharynx b)Decrease blood volume c)decrease blood pressure d)decreased blood osmolarity
asked on July 22, 2011 
biology
lipid soluble must be oxidized before they are excreted from.otherwise the toxins would not be able to pass through the a)bowman capsule b)red blood cells c)cell membranes d)cytoskeleton
asked on July 22, 2011 
physics
11. The charged plates of a parallel plate capacitor each have a charge density of 3 x 103 C/m2. What is the electric field E between the plates?
asked on March 15, 2011 
Algebra
The first three equations I have solved, I would just appreciate someone checking them over to make sure I'm doing them right. Find the GCF: 16x^2z ,40xz^2 , 72z^3 = 3^3z Factor our GCF: a(a+1)  3(a+1) = a+1 Factor Polynomial: 9a^2  64b^2 =
asked on January 22, 2009 
government
. The source of the Supreme Court’s authority is (Points : 1) moral suasion. judicial activism. concurring opinion. dissent.
asked on February 26, 2013 
geometry
A rope is connected to a boat and to the boat's anchor that is resting on the ocean floor at a position not directly under the boat. The rope is 105 feet long and the water is 55 feet deep. To the nearest tenth of a foot, how far is the anchor from a point
asked on October 2, 2008 
algebra
solve for x: 2(x3)  3(x+5) = 3 (x2)  7 Perform the indicated multiplications; add up the constants and the terms that involve x; then get all terms that involve x on one side of the equation. 2x 6 3x 15 = 3x 6 7 x 21 = 3x 13 8 = 4x x = ? 2
asked on July 10, 2007 
algebra
A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40cm wide rolls that are cut to fit between the rafters in the attic. If the roof is 6 m from peak to eave and the attic space is 2 m high at
asked on July 4, 2007 
calculus
suppose the set of points have the following coordinates:(2,3),(4,4),(2,3). please calculate the moment of this set of points about the xaxis and also about the center.
asked on August 17, 2012 
math
i have a math question and i know that there is a simple solution that i am missing. We are going to be given a 100 foot piece of rope and we have to make a baseball diamond where the bases are 60feet apart. Help
asked on August 31, 2009 
IT
You have been tasked with the project of organizing a company offsite 2day training session in which people are brought in from different parts of the country. This entails everything from preparation, accommodations, and facilities. • There is APA
asked on July 17, 2013 
PHYSICS
A molecule consists of two atoms. The atoms have masses of 17 u and 14 u and are 1.78e10 m apart. How far from the first atom is the center of mass of the molecule?
asked on October 14, 2008

Math
I got confused for a second. You are a life saver! 2733.83
posted on September 11, 2019 
Math
What do you mean by e
posted on September 11, 2019 
Math
This is the only information given 😬
posted on September 11, 2019 
Math
Great that's exactly what I got 1135.35
posted on September 11, 2019 
Mat104
Where did you get the 1.018333?
posted on September 11, 2019 
chemistry
jhf
posted on July 11, 2019 
SCIENCE NOW
I have the same question but I'm not sure if we have the same answer choices... A. used to compare to cultures C and D B. used to compare to cultures A and B C. used as a control D. all of the above E. none of the above correct= D
posted on April 23, 2017 
Math Linear Equations
suppose a new watersports company aqua sports is open for business they are running a grand opening sale their rental cost can be modeled by linear equation we are told that for 30 minutes of use their rental cost will $50 for 60 minutes of use their
posted on December 15, 2014 
PHYSICS
bob is correct, except that you have to subtract the Force*sin(31). It's a poorly worded problem, to say the least.
posted on April 2, 2013 
Chemistry
Oh... I see where I went wrong. thanks!
posted on March 11, 2013 
Chemistry
Ok, that's what I did before. so 2E11 = x^2/(0.1x) so x^2 = 2E12  2E11x But what I don't understand then is how do we solve for x? I used the quadratic equation but when I plugged in those values it gives me 0. So where am I going wrong?
posted on March 11, 2013 
Chemistry
Thanks!
posted on March 11, 2013 
Chemistry
I'm really confused. I've never done a problem like this before. Could you plug in the values for me? It just doesn't make any sense and my teacher won't explain it to me when I ask about it.
posted on March 11, 2013 
Chemistry
But what's Kw? and the value for NH3? Is that just x? So should it be Kw/5.0x104 =(x)(x)/(0.1x)
posted on March 11, 2013 
Chemistry
I'm not sure how to set up the equations using the volumes, and I'm not even sure what givens I'm supposed to use.
posted on March 11, 2013 
chemistry
If you heated a hydrate too quickly and some of it splattered out of the beaker how would it affect the calclated percent by mass of water and the molecular formula
posted on May 11, 2010 
Physics
Chris Cheggies
posted on January 10, 2010 
physics
PV=nRT ideal gas law is the only thing i got n R T will stay constant i believe so that leaves me with PV so PV of initial vs. PV of final... maybe
posted on November 19, 2008 
physics
just guessing but normal atmospheric pressure
posted on November 19, 2008 
Math
1.367
posted on October 14, 2008 
physics
thank you
posted on October 14, 2008 
algebra 1
it equals a negative number
posted on October 2, 2008