Monday
December 22, 2014

Posts by Brittany


Total # Posts: 850

chemistry
How do I do a question like this please help and explain it!! Calculate the pH of a buffer solution that contains 0.22 M benzoic acid (C6H5CO2H) and 0.24 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] Round your answer to two places past the decimal.
March 25, 2012

Chem 111
A solution is prepared by mixing 499 mL of 0.19 M Tris·Base and 592 mL of 0.37 M Tris·Acid. What is the pH of this solution? [Ka(Tris·Acid) = 8.5 × 10-9] Round your answer to two places past the decimal. I can do basic pH questions but I am at a loss...
March 25, 2012

math
A town has a population of 32,000 in the year 2002; 35,200 in the year 2003; 38,720 in the year 2004; and 42,592 in the year 2005. If this pattern continues, what will the population be in the year 2016?
March 10, 2012

geography
Which region of southern grasslands in south america have rich deposits of oil and bauxite?
March 9, 2012

geography
which region of the southern grasslands possesses rich deposits of oil and bauxite?
March 9, 2012

Chemistry
21 gCH3OH*(1 mol/32.01CH3OH)*(252.8/1 mol)
March 5, 2012

Chemistry
2CH3OH(g)->2CH4(g)+O2(g) Change in H=252.8 kJ
March 5, 2012

Chemistry
So far my equation is 21 gCH3OH*(1 mol/32.01CH3OH)
March 5, 2012

Chemistry
Calculate the amount of heat transferred when 21.0 of CH3OH(g) is decomposed by this reaction at constant pressure.
March 5, 2012

Chemistry
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 69.8 kJ of heat. Before the reaction, the volume of the system was 8.80 L . After the reaction, the volume of the system was 2.80 L . Calculate the total internal energy change, change in U , in kilojoules.
March 5, 2012

Adv. Function math
How would you set up this problem if instead of using 1000 feet of fencing, only 750 feet of fencing is used? Solve the problem to find the maximum area..
February 29, 2012

Finance
Say that you purchase a house for $270,000 by getting a mortgage for $235,000 and paying a $35,000 down payment. If you get a 15-year mortgage with a 8 percent interest rate, what are the monthly payments?
February 27, 2012

Physics Please Help!
A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?
February 21, 2012

Physics
A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?
February 21, 2012

PHYSICS
A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to ...
February 20, 2012

Physics
A solid disk with a mass of 100kg and a radius of 0.2m, turns clockwise through an angular displacement 10 rad when starting from rest to attain its maximum angular speed, of 1 revolution every 0.5s. What is the angular acceleration that the wheel experienced in order to ...
February 20, 2012

algebra
use any three of the digits 2,3,4 and 6 to form an 8 digit factor and a two didgit factor with a estimated product that is between 140 and 250
February 18, 2012

phi 103
no fallacy committed
February 12, 2012

Physics
ohh okies thanks for clearing that up (:
February 12, 2012

Physics
i mean.. mr^2w+Iw = mr^2w+Iw ... which is equivalent to L+L = L+L
February 12, 2012

Physics
I don't really understand we use I1w1=I2w2? but according to your equation its mr^2+Iw = mr^2+Iw ... which is equivalent to I+L = I+L <-- i dont get this part? and the answer is 0.568 rev/s which according to your way is right but its 19 instead of 29.
February 12, 2012

Physics
A turntable of radius 2m rotates freely about a fixed vertical axis. A child 19 kg is standing on the turntable right at the outer edge and the system is initially rotating at an angular speed of 0.5 rev/s. The child then moves to position 1m from center of the turntable. what...
February 12, 2012

algebra
At a local ice cream shop, you can choose from a collection of 18 different toppings. If you want to choose at least one topping, how many different topping combinations are possible (assuming no repeat toppings)?
February 6, 2012

statistics
Sweden is reported to have among the highest percentage of citizens aged 80 years and over, at approximately 5.5 % (i.e. 5.5 % of it's population falls within this age category). Suppose 20 individuals are randomly selected from the population, and X is the number of ...
February 5, 2012

math
From an exteror point P that is h units form a circle of radius r, a tangent line is drawn to the circle. Let d denote the distance from the point P to the point of tangency T. Express d as a function of h.(HINT: if C is the center of the circle, the PT is perpendicular to CT)
January 30, 2012

biology
Explain the importance of carbon's ability to form covalent bonds in straight chains, branched chains, or rings.
January 24, 2012

chemistry
What mass of H2SO4 would be required to react with 0.59 mol of NaOH?
January 19, 2012

Math
How do I find the relative maximum and minimum and the zeros of f(x)=-x^3+16x^2-76x+96??
January 15, 2012

english
what does SS stand for in Shurley Method?
January 4, 2012

Geometry
(3,-6)
December 16, 2011

phyics
Find the horizontal range of a baseball that leaves the bat at an angle of 63 degrees, with the horizontal with an initial velocity of 160 km/hr. discard air resistance
December 14, 2011

physics
the diver acheives a horizontal velocity of 3.75 m/s from a diving platform located 6.0 m above the water. How far from the edge of the platform will the diver be when she hits the water?
December 14, 2011

Statistics
A study shows that 10% of americans are left-handed. Find the probability that at most one student is left handed in a class of 20 students.
December 9, 2011

Trig
1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...
December 7, 2011

science
which of the following is a testable hypothesis helium, ammonia, oxidation-reduction?
December 6, 2011

physics
A hockey player shoots a puck, exerting a constant force of 30.0 N on the hockey puck for 0.16 seconds. What is the magnitude of the impulse given to the puck? 190 kg ∙ m/s 98 kg ∙ m/s 9.6 kg ∙ m/s 4.8 kg ∙ m/s
December 2, 2011

geometry
the angles in a pentagon measure x-30,x+20,x-30, x+30 and x find the measure of each angle.
November 28, 2011

geometry
the angles in a hexagon are 135, 62, 151, 140, x and x +6. find the measure of the missing angles.
November 28, 2011

chemistry
What is the solubility of silver carbonate in 0.1 M Na2CO3
November 17, 2011

chemistry
What is the solubility of silver carbonate (Ag2CO3) in pure water
November 17, 2011

world history
How did powerful families of Japan like the Fujiwara legitimate their power at court?
November 8, 2011

geometry
If the sum of the lenghts of two sides of a triangle is 15, what is the largest possible integral value for the third side?
October 17, 2011

chemistry
PE increases
October 11, 2011

Language
Buttering
October 6, 2011

Algebra 2
How do you find a shaded area of a rectangle of 24 ft and 40 ft and 100 ft
October 1, 2011

help please!:-)
It wasn't right :(
October 1, 2011

World History 201
I need help with one T or false guestion. I don't know if this is true or false As a christian, persian king khosrow I forbade zoroastrian teaching troughout his empire.
September 28, 2011

Chemistry
Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
September 28, 2011

Please help!
Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
September 28, 2011

Help please:-)
What is the most important key to an effective essay?
September 28, 2011

Chemistry
Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.
September 28, 2011

Algebra 1 Scientific Notation
1.462828271x10^99
September 26, 2011

math
the sum of the lenths of any two sides of a triangle must be greater than the third side. if a triangle has one side that is 17 cm and a second side that is 4cm less than twice the third side, what are the possible lenths for the second and third side?
September 26, 2011

Algebra
A runner wants to run 11.6 km. She knows that her running pace is 8.1 miles per hour. How many minutes must she run?
September 22, 2011

geometry
A.
September 22, 2011

Chemistry
For the following acid-base reaction, calculate the mass (in grams) of each acid necessary to completely react with and neutralize 5.00 g of the base. HCl(aq)+ NaOH(aq)->H20(l)+NaCl(aq) Please explain how to do this.
September 16, 2011

social studies
why might the earliest farming communities have developed along the Nile,Tigris,and Euphrates
September 15, 2011

social studies
how did rivres in southwest asia enrich the soil
September 15, 2011

math
the cube of what number is 2197?
September 14, 2011

physics
A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? What is the baseball's vertical velocity? How long does it take the baseball to get 28m in front of home plate?
September 11, 2011

physics
ummmmmmmmmmmm who the heck are you??? im asking a simple physics question if you have a problem then you can take it somewhere else darling:)
September 11, 2011

physics
A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? 1m/s What is the baseball's vertical velocity? 2m/s How long does it take the baseball to get 28m in front of home plate? 3 seconds
September 11, 2011

7th grade social studies
how did rivers enrich the soil
September 7, 2011

Chemistry
Boron has only two naturally occurring isotopes. The mass of boron-10 is 10.01294 amu and the mass of boron-11 is 11.00931 amu. Use the atomic mass of boron to calculate the relative abundance of boron-10. Atomic mass of boron is 10.81 How do I solve this?
September 7, 2011

Chemistry
Thank you!
September 7, 2011

Chemistry
An alpha particle,4He2+ , has a mass of 4.00151 . Find the value of its charge to mass ratio in C/kg. How do I solve this?
September 7, 2011

Chemistry
What is the chemical name for BeCrO4*5H2O?
September 7, 2011

math
Find the distance that the earth travels in seven days in its path around the sun. Assume that a year has 365 days and that the path of the earth around the sun is a circle of radius 93 million miles. [The path of the earth around the sun is actually an ellipse with the sun at...
September 2, 2011

Chemistry
That's how I did it but the computer said it was wrong. I guess I'll have to ask the teacher about it. Thanks for your help!
August 31, 2011

Chemistry
Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.2×10^−8 pm^3 And the volume of the atom is 1.4×10^6 pm^3 I ...
August 31, 2011

geometry
If X=5 units, x=11 units, h=10 units, what is the area of trapezoid shown above
August 28, 2011

history
what animal was a source of food for early hunters yet is not in existence today?
August 18, 2011

history
Where do archaeologists believe early Americans came from?
August 18, 2011

Math
Samual is 5 in , taller than Jackie - 8 shelly is 0.7 in taller than Jackie whos taller?
August 18, 2011

Math
The temperature at 3:00 am was -17 f by noon the temperture was -17.8 f at what time was it the coldest?
August 18, 2011

math
Evaluate write in simplest form Y - for y = -6 and z = -20 z
August 18, 2011

CalcULUS
nevermind
July 16, 2011

CalcULUS
Find slope of f(x)=x^3–2x^2+2x+2 on the interval (–3–1).
July 16, 2011

CALCULUS
Consider the function f(x)=sqrt(2–5x^2), –5≤x≤1. The absolute minimum value is ____ and this occurs at x equals ______? Found the max value to be 2 at x=0.
July 16, 2011

math
Thanks Reiny it helped alot
July 12, 2011

physics
A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?
June 26, 2011

Algebra 1
complete. 6t to the 2nd power - 23t + 20=(3t - 4)(2t - .....)
June 26, 2011

Algebra 1
Complete. g to the 2nd power - 8g+16=(g - 4)(g....4)
June 26, 2011

Math
Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. If the brother's age is represented by a, what is Luis' age? What will be the brother's age next year?
June 26, 2011

statistics
Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? A) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. B) Reject Ho if the ...
June 21, 2011

peresonal finance
how does education plays a critical role in financial success
June 3, 2011

American Studies
Affordable housing and improved transportation allowed people to begin to move away from central cities to the suburbs Think: When did affordable housing and highways come about? The industrial revolution gave rise to urbanization Think: When was the first occurrence of ...
May 28, 2011

American Studies
Identify two causes of urbanization (growth in city life) and explain how each changed the geography of the United States.
May 28, 2011

calculus
Pretend the program in Senegal had been reducing infant mortality at a rate of 12.2 % per year. How long would it take for infant mortality to be reduced by 31 %?
May 15, 2011

chemistry
If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?
May 12, 2011

math
heelp me with scientific nottion
May 2, 2011

history
In the 1950's, how did some corperations expand to protect themselves against the dangers of economic downturns?
April 26, 2011

families in crisis
What are some of the unique challenges facing Native American (Indian American) families, as described in pp. 471-487 in Ferguson? (Shifting the Center: Understanding Contemporary Families by Susan Ferguson) How is ageing seen differently in the Apache community than it is ...
April 21, 2011

Chemistry
A 10.0 ml sample of vinegar which is an aqueous solution of acetic acid, requires 16.5ml of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic acid solution?
April 19, 2011

finance
It would take 11 years
April 14, 2011

math
Write a formula for the height of a trapeziod based on the formula for it area A= 1/2(base1 + base2)h
April 13, 2011

Math
Five balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.
April 10, 2011

Calc
Suppose f(x,y) = A - (x^2 + Bx + y^2 +Cy). What values of A, B, and C give f(x,y) a local maximum value of 15 at the point (-2,1)? Any help would be appreciated!
April 4, 2011

math
Umm I think Its 60, if I know what you mean, if its a triangle. ( learned that if you press alt and 0176, it will give you the degree sign. A triangle is 180°. You take 40+80, and get 120. So then you take 180-120, and get 60°.
April 3, 2011

physics
2339
April 3, 2011

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