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Ryan
Questions and answers by
Ryan
, page 6
Questions (766)
Calculate the ppm of the sodium ions when 2.91 g of sodium triphosphate are added to 2.33 L of solution.
I earnestly have no idea
2 answers
493 views
Select the pair of substances in which the one with the higher vapor pressure at a given temperature is listed first.
1. C7H16,
4 answers
6,266 views
A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed
3 answers
644 views
You have a tank of helium with a volume of 10 liters that is currently under 40 atm of pressure. If you open the valve on the
2 answers
540 views
A sample of air contains 12.8 µg/m3
of beryllium dust. How many atoms of beryllium are present in a room with dimensions of 8
2 answers
728 views
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop
3 answers
1,796 views
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent
3 answers
1,165 views
Once the adsorbent is packed in a liquid chromatography column, it is important that the level of the elution solvent not drop
4 answers
785 views
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography adsorbent
1 answer
787 views
Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b)
3 answers
760 views
Why should a mixture to be separated by column chromatography be introduced onto the column in a minimum amount of solvent?
4 answers
1,458 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
338 views
A solution of 4-methyl-3-penten-2-one in ethanol shows an absorbance of 0.52 at 236 nm in a cell with a 1-cm light path. Its
2 answers
606 views
A solution of 4-methyl-3-penten-2-one in ethanol shows an absorbance of 0.52 at 236 nm in a cell with a 1-cm light path. Its
2 answers
1,071 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
334 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
322 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
325 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
419 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
426 views
Why does the carotene elute from the column before the chlorophylls?
1 answer
317 views
name all the possible isomers of methyl nitrobenzoate and nitroacetanilide which can be formed
1 answer
420 views
describe how a population is thought to evolve through natural selection. Provide an example (specifically, the peppered moth)
1 answer
389 views
Consider the following reaction:
CO(g)+H2O(g)⇌CO2(g)+H2(g) Kp=0.0611 at 2000 K A reaction mixture initially contains a CO
2 answers
889 views
The mass of spectrum of 2,4-dimethylpentane shows peaks at m/z 43, 57, and 85. Show the fragments which produce these peaks.
3 answers
484 views
A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 8 students from
1 answer
1,280 views
The coefficient of static friction between the m = 3.75-kg crate and the 35.0° incline of the figure below is 0.320. What
2 answers
1,120 views
Find a third-degree polynomial equation with rational coefficients that has roots -1 and i+1
3 answers
1,313 views
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you
1 answer
471 views
What does b-mercaptoethanol do to secretory proteins?
1 answer
345 views
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you
1 answer
478 views
What does b-mercaptoethanol do to secretory proteins?also...If you forgot to add b-mercaptoethanol to a secretory protein, would
1 answer
383 views
3) For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you
1 answer
475 views
What does b-mercaptoethanol do to secretory proteins?also...If you forgot to add b-mercaptoethanol to a secretory protein, would
1 answer
407 views
What does b-mercaptoethanol do to secretory proteins?If you forgot to add b-mercaptoethanol to a secretory protein, would the
1 answer
389 views
For each of the following characteristics, will the migration of the protein speed up, slow down, or remain unchanged if you do
1 answer
512 views
What does b-mercaptoethanol do to secretory proteins?If you forgot to add b-mercaptoethanol to a secretory protein, would the
3 answers
417 views
8) Describe the difference between a prosthetic group, cofactor, and coenzyme; provide an example of each.
1 answer
384 views
Two flares are launched from a life raft. The height h of the first flare in metres above the sea is modelled by the formula h1=
1 answer
448 views
A manufacture finds the total cost "C" for a product is expressed by C=3x2-8, and the total revenue "R" by R=3x-2, where x is
1 answer
415 views
The law connecting friction F and load L for an experiment is of the form F =aL+b, where a and b are constants. When F =5.6,
1 answer
449 views
Two resistors in series, R1 and R2, have a total resistance of 1,600 ohms. The resistance of R2 is 560 ohms less than twice R1.
1 answer
430 views
The angle of a rotating shaft turns in t seconds is given by theta= ω+1/2at^2
and it is given that ω=3 2 rad/s and α=0.6 rad/s
4 answers
579 views
Sin x/[1-cos(-x)] = csc x + cot x
Please Verify the Identity. I have been going in circle with this one... Just a hint would be
4 answers
1,766 views
How many grams of Mg must react with HCl in order to produce 40.0 ml of hydrogen gas at 22 degrees celsius and 1.02 bar?
If the
3 answers
2,811 views
What is the product formed when phtalic anhydride reactors with D2O/D+?
Thank you in advanced!
1 answer
346 views
Hey, we recently started a topic in class that I don't understand well, I just want to post 6 of the problems and ask if they're
2 answers
935 views
How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP
according to the chemical equation shown
7 answers
5,244 views
In triangle ABC, AC=BC. The point D is on BC such that AB=AD=DC. Compute the measure of angle C.
I'm not sure how to do this...
2 answers
843 views
Joan's stamp collection consists of three books. Two tenths of her stamps are on the first book, several sevenths are in the
4 answers
2,046 views
Solve for all real values of x is 9^x+2=240+9^x
THIS ONE IS HARD
2 answers
478 views
A circle of radius 2 is externally tangent to a circle of radius 8. Compute the length of their common tangent.
3 answers
1,031 views
When you change the dna code to mRNA, will A become U or T?
1 answer
374 views
How many moles of carbon are found in 250.0 g of CaCO3?
I started off with finding the molar mass of CaCO3, which is 100.09g.
6 answers
2,161 views
Of the following, which must be true whenever x^1998 = y^1998?
A. x^999=y^999 B. x^1997=y^1997 C. x^1999=y^1999 D. x^2000=y^1000
1 answer
442 views
If the lengths of the sides of a rectangle are integers, and if one side is 2 more than another, then the perimeter could equal
A
4 answers
387 views
If n is a positive integer, n! is the product of the first n positive integers. For example, 4! = 4 x 3 x 2 x 1 =24. If u and v
2 answers
580 views
The stock that Mr. Ames bought cost him $80 a share. The par value of the stock is $100. If the stock pays $6 a year in
4 answers
1,709 views
Carol started from home on a trip averaging 30 miles per hour how fast must her mother drive to catch up to her in 3 hours if
4 answers
1,243 views
In a pseudopythagorean triangle, the sides are all integers and the sum of the square roots of the sides equals the square root
2 answers
472 views
I watched 1000 ants build an anthill in 5 hours. Working at the same rate, 2500 ants could have built the anthill in ? hours?
A.
6 answers
491 views
If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be
A. 0 B. 1 C. -1 D.
1 answer
312 views
The result of adding a number to itself is usually unequal to the result of multiplying the number by itself. For how many
1 answer
448 views
If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be
A. 0 B. 1 C. -1 D.
3 answers
529 views
In 2014, Timmers, Inc. (a retail clothing company) sold 102,300 units of its product at an average price of
$100.00 per unit. The
1 answer
475 views
. Jordan’s Jeans Company reported net income for 2014 of $871,800 and the company paid dividends of $0.08
per share in 2014.
2 answers
556 views
S= L(1-r), solve for r
I tried both distributing L and dividing by it, but I am not sure which way is correct. Any help would be
1 answer
321 views
Jonathan measure 2 cups of flour into a bowl on the counter then he spilled part of it and now there is only three eighths cup
3 answers
993 views
I have homework in which it asks "Describe the difference between elements, mixtures and compounds. (I have done the first
1 answer
501 views
find the solutions to the equation;
x^(2/5)-8x(1/5)+16=0
1 answer
395 views
Im really struggling and need help with this
1. One of the tables below contains (x,y) values that were generated by a linear
3 answers
1,294 views
7. For the function defined by:
f(x)= {x^2, x<=1} {2x+1, x>1} a. evaluate f(0) 8. Solve the following system of equations
1 answer
873 views
What were five accomplishments of marie curie?
4 answers
963 views
A ball is thrown upward with an initial velocity of 4 ft/sec from a height of 10 feet. What is the maximum height that the ball
4 answers
2,029 views
A permanent magnet creates a homogenous magnetic field B~
inside a rectangular region. The magnet is moving with a velocity ~v
2 answers
504 views
If there was a way to accelerate a spaceship close to the speed of light to go visit some neighboring star system,
one would
1 answer
477 views
Remember the Poynting vector? The magnitude of this vector gives the amount of energy per second that
flows through a unit area
2 answers
562 views
2. Suppose that T is a linear transformation from R2 to R4
such that T ((1, 1)) = (3, −1, 4, −3) and T ((2, −1)) = (3,
0 answers
951 views
8.1 Collision?
A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a
2 answers
517 views
a gun is fired with muzzle velocity v0 = 1000 m/s straight up along the z-axis. While moving through the air the Earth's gravity
2 answers
502 views
Monica earned $60 from a bonus plus $8.50 per hour (h) she worked this week. Which of the following expressions best represents
4 answers
2,165 views
Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a
4 answers
1,740 views
Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a
4 answers
1,214 views
60 decreased by the quotient of a number and 4.
I am reading it as: n-4/60 Am I correct?
1 answer
321 views
A candy company makes a chocolate nut mix and and a chocolate fruit mix. The nut mix uses 2 pounds of chocolate, 2 pounds of
2 answers
999 views
You have found the following stock quote for RJW Enterprises, Inc., in the financial pages of today's newspaper.
52 Week High:
1 answer
1,212 views
The average of a group of seven test scores is 80. If the lowest and highest scores are thrown out the average of the remaining
2 answers
795 views
If you deposit $5,000 in an account that pays 5% interest compounded annually, how much money will you have in your account at
3 answers
1,137 views
True or false (logx)^2=2logx
True or false in56/in7=in8 i got true for the first one and false on the second im sorry for posting
3 answers
668 views
[Multivariable Calc]
Let R be the region that is inside of the cardioid r=2 + cos(theta) and outside the circle r=2? So i need to
1 answer
439 views
The psychological sensation of loudness B is measured in decibels and is defined with reference to the intensity, , of a barely
7 answers
2,218 views
Write the equation of the parabola
1.Vertex(2,5) Focus(2,-3) 2.Directrix=x=3/4 Focus(5/4,-3) For 1. i got(x-2)^2=32(y-5)^2 For 2.
3 answers
572 views
Write the equation of the parabola
1.Vertex(2,5) Focus(2,-3) 2.Directrix=x=3/4 Focus(5/4,-3) For 1. i got(x-2)^2=32(y-5)^2 For 2.
4 answers
581 views
How can two rectangles each have an area of 12 units, but have different lengths and widths
1 answer
392 views
I really need help
Find the equation of the hyperbola 1.Vertices(-4,0)(4,0) Asymptotes: y=1/3x, y=-1/3x 2.Vertices(-6,0)(6,0)
3 answers
777 views
Jonathan burns 15 calories per minute he runs on the treadmill Jonathan ran 5 minutes on Monday 12 minutes on Tuesday and 8
4 answers
1,495 views
Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water. Suppose 61.
4 answers
1,423 views
I am really confused. I am trying to convert quarters to dimes to see which is greater. The problem is 540 quarters _ 2000
1 answer
383 views
1.Find the missing values given that Ø in degrees=270.
2.Find the missing values given that Ø in degrees=270. I can find the
3 answers
625 views
1.Find the missing values given that Ø in degrees=30.
Can someone show me how to find sin
3 answers
517 views
1.If tan theta=3/4 and theta is an acute angle, find cos theta.
2.If sin theta=12/13 and theta is an acute angle, find cot theta.
2 answers
1,312 views
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