maath
Most popular questions and responses by maath
chemistry
A chemist in a galaxy far, far away performed the Millikan oil drop experiment and got the following results for the charges on various drops. 2.52 ✕ 1012 zirkombs 9.45 ✕ 1012 zirkombs 3.78 ✕ 1012 zirkombs 6.30 ✕ 1013 zirkombs Use these data to
asked on September 13, 2018 
math
The volume enclosed by a sphere of radius r is (4/3)πr^3. The surface area of the same sphere is 4πr^2. You may already have noticed that the volume is exactly (1/3)r times the surface area. Explain why this relationship should be expected. One way is to
asked on July 24, 2018 
Chemistry
A 5.00 g sample of aluminum pellets (specific heat capacity = 0.89 J/°C·g) and a 10.00 g sample of iron pellets (specific heat capacity = 0.45 J/°C·g) are heated to 100.0°C. The mixture of hot iron and aluminum is then dropped into 94.9 g of water at
asked on January 13, 2019 
chemistry
Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 21.79 mg terephthalic acid produces 46.18 mg CO2 and 7.10 mg H2O. If 0.250 mol of terephthalic acid has a mass of
asked on October 8, 2018 
chemistry
The enthalpy of fusion of ice is 6.020 kJ/mol. The heat capacity of liquid water is 75.4 J/mol degrees Celsius. What is the smallest number of ice cubes at 0 degrees Celsius, each containing one mole of water, necessary to cool 500. g of liquid water
asked on January 28, 2019 
chemistry
Why do some compounds and elements exist as a liquid at room temperature, while others are solids and gases? What forces are involved?
asked on March 17, 2019 
chemistry
Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 40. cm^3. If the combustion of this mixture releases 950. J of energy, to what volume will the gas expand against a constant pressure of 650. torr if all the
asked on December 23, 2018 
chemistry
A 152g sample of ice at 37 degrees Celsius is heated until it turns into liquid water at 0 degrees Celsius. Find the change in heat content of the system. I'm really confused on how to solve this question knowing the fact that the state of the system is
asked on January 14, 2019 
math
If three dice are tossed, their sum could be 7. What is the probability of this? I'm guessing it's something to do with combinations?? I wrote down all the combinations of it equaling 7: 3, 3, 1 // 4, 2, 1 // 1, 5, 1 So I thought that since there are five
asked on May 4, 2019 
math  probability
What is the probability that this year's graduation will fall on the birthday of exactly one of the 336 Seniors? What is the probability that there is more than one such Senior?
asked on April 10, 2019 
math
The height of an object moving up and down is described by y=72+40cos18t (in degree mode). To at least three decimal places, confirm that the average speed of the object is 2/pi times its greatest speed.
asked on November 26, 2018 
math
Find the focus and directrix for the parabola y=ax^2. What special meaning does the expression 1/(4a) have?
asked on November 11, 2018 
math
There are many examples of graphs that have period 60 and whose yvalues vary between 8 and 8. First, find a formula for such a function f, given that f(0)=8. Next, find a formula for such a function g, given that g(0)=0. For your f, also find the three
asked on November 7, 2018 
english
What is the deeper meaning of the poem, "A Lover" by Amy Lowell? This is her poem: "If I could catch the green lantern of the firefly I could see to write you a letter."
asked on December 3, 2018 
chemistry
why do molecules and ions with the same number of atoms and valence electrons have the same or similar molecular shape?
asked on March 1, 2019 
math
How do you find the value of m in the equation y=k+asin(mx)?
asked on August 8, 2018 
Chemistry
Thallium(I) hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.57 g TlOH per liter. I got 1.44 but I'm pretty sure that's wrong?
asked on November 3, 2018 
chemistry
Give the maximum number of electrons in an atom that can have these quantum numbers. 1. n = 3, ℓ = 2, mℓ = 1, ms = 1/2 2. n = 2, ℓ = 1, mℓ = 1, ms = 1/2
asked on February 9, 2019 
chemistry
Calculate the average kinetic energy of the N2 molecules in a sample of N2 gas at 266 K and at 532 K. I got 32.7 and 65.5 but they're wrong??
asked on December 11, 2018 
math
Let F1 = (0,2), F2 = (0,2), and P = (x,y). Use the distance formula to convert the equation PF1 + PF2 = 6 into Cartesian form. Simplify your answer until it reaches the form hx^2+ky^2=m. I tried solving this but I got stuck with all the square roots and
asked on August 9, 2018 
math
what is the absolute value of infinity? is it just zero?
asked on September 10, 2019 
math
The focal points of a hyperbola are (0,6) and (0,6), and the point (5,6) is on one of its branches. Find coordinates for the points where the hyperbola intersects its major axis. Also find equations for the asymptotes, and use them to help you draw the
asked on February 22, 2019 
math
Find p(p^1(x)) when p(x)=x^24 I tried solving this and I got x^4x+20 but that has no solution so I'm a little confused.
asked on September 15, 2018 
chemistry
Several compounds containing only sulfur (S) and fluorine (F) are known. Three of them have the following compositions. i. 1.188 g of F for every 1.000 g of S ii. 2.375 g of F for every 1.000 g of S iii. 3.563 g of F for every 1.000 g of S How do these
asked on September 13, 2018 
chemistry
You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 650 grams. The total mass of the setup is 850 grams. The chemical is ignited by means of a magnifying glass
asked on September 12, 2018 
history
What is a quasimartial law? I looked this up on google but there's no direct answer to it.
asked on October 13, 2018 
math
Let F=(0,0) be the focus and the line y=6 be the directrix. Plot several points P that are half as far from the focus as they are from the directrix. The configuration of all such points is an ellipse. Identify the four points where the ellipse crosses
asked on October 18, 2018 
math
Show that any dilation transforms any figure into a similar figure.
asked on August 17, 2017 
chemistry
What is the largest number of ions in any of your formulas? What is the total positive charge and the total negative charge in each formula with this many ions? Give two examples of these formulas.
asked on September 23, 2018 
math
Is tan(90theta) the same as tan(theta)???
asked on April 8, 2018 
math
Show that the surface area of a sphere is two thirds of the total surface area of any cylinder circumscribed around the sphere (the sphere therefore touches both bases of the cylinder as well as its lateral surface).
asked on July 30, 2018 
math
Show that any dilation transforms any figure into a similar figure.
asked on August 19, 2017 
math
Find a vector of length 3 that is perpendicular to [2,1,2]
asked on August 15, 2017 
chemistry
How do you write the chemical formula for ammonium acetate and ammonium hydrogen sulfate?
asked on September 8, 2018 
math
Explain the notation M^1 used for the inverse of a square matrix M. I thought M^1 would be a normal inverse matrix except the numbers would be vertically switched like in fractions...? Not sure though.
asked on August 12, 2018

chemistry
Ohh okay, all these answers make sense. Thank you so much!
posted on March 18, 2019 
chemistry
how do I calculate the heat of fusion of ice??
posted on January 14, 2019 
Chemistry
Okay got it thank you!
posted on January 14, 2019 
math
Okay, that makes so much more sense. Thank you so much!
posted on November 7, 2018 
math
Ohh okay got it thank you!
posted on September 15, 2018 
chemistry
right thank you!
posted on September 13, 2018 
math
okay, that makes sense. thank you!
posted on August 10, 2018 
math
sorry my response is so late... I tried solving it again and I got the equation y=2+4sin(3x). I got the two because the graph is shifted 2 units up and I got the four from the graph being stretched vertically 4 times. Then I plugged in the point (30,6)
posted on August 9, 2018 
math
what if you had a maximum point let's say (30,6) and a yint of (2,0) and you had to find the equation of the graph? I get how to find the other variables just not m.
posted on August 8, 2018 
math
okay thanks! also is there any way to simplify (cos^4(theta)  sin^4(theta)) / (cos^2(theta)*sin(theta))
posted on April 8, 2018