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Jack
Questions and answers by visitors named
Jack
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Questions (1,125)
A)250 g of LiBr is dissolved in 200g of water 100 degrees C. The solution is then cooled to 20 degrees C. How much precipitate
2 answers
488 views
Answer the following question about copper (II) sulfate pentahydrate:
a)how much water (in g) is there in 10.0 g of the compound
2 answers
652 views
Which of the following compounds will melt ice at the lowest temperature? Sucrose, sodium chloride, or magnesium chloride?
1 answer
393 views
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many
2 answers
577 views
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many
2 answers
638 views
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many
4 answers
3,832 views
What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide?
2H2O2 (l) ==> 2H2O (l) + O2(g)
1 answer
1,102 views
What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide?
2H2O2 (l) ==> 2H2O (l) + O2(g)
1 answer
813 views
What similarities and differences are there between functions and linear equations?
3 answers
493 views
x=3-0
. What percentage of the area under the normal curve lies to the left of ( 16.0% 15.80% 2.50% 0.50% having trouble with
1 answer
456 views
Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what
5 answers
2,172 views
Total plasma volume is important in determining the required plasma component in blood replacement theory for a person
3 answers
556 views
Consider the function defined below.
y = 2t3 - 4t2 + 3 (a) Calculate the second derivative. y '' = (b) Calculate the third
1 answer
464 views
solve by multiplication
-7/8x = -9/10
1 answer
367 views
A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F
3 answers
4,939 views
However, misfortune and trouble did not stop Ray Charles.
Subject=misfortune, trouble Verb= did stop
1 answer
210 views
which has greater volume?
a) 1.0 kg of feathers or 1.0 kg of lead b) 100 g of gold or 100 g of water c) 1.0 L of copper or 1.0 L
4 answers
2,633 views
Solve the following equation.
4.7 = 1.13x^2 Do i square root the 1.13x^2 first? or divide both sides by 1.13?
4 answers
531 views
find the range of the function.
g(x) = 5 + (square root of) (4 - x) please show all steps.
1 answer
324 views
Are significant figures relevant in temperature?
ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as
1 answer
390 views
Are significant figures relevant in temperature?
ex: (-459 *F - 32 *F)(5 *C/ 9 *F) = -272.78 *C So would I leave my answer as
1 answer
384 views
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated
1 answer
1,146 views
Convert a density of 2.74 x 103 g/L into a density with dimensions of kg/mL.
please show how would this conversion be done.??
1 answer
323 views
Which of the following properties is a chemical property of phosphorus?
Answer a) it burns in air b) it is a white waxy solid c)
7 answers
2,926 views
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated
3 answers
3,036 views
The strength of a cable is proportional to the square of its diameter. If a 2-cm cable will support 800kg, how much will a 3-cm
2 answers
1,069 views
Determine the coordinates of the point (xy) where the curves y=(12)x−5 and y=x2+2x−15 intersect in the third quadrant
5 answers
1,186 views
A single 4p orbital can hold how many electrons?
i got 6 is that correct or no?
1 answer
293 views
Would conducting electricity be considered a physical or chemical property of ZINC
i got phyiscal but just want to make sure.
1 answer
399 views
Would Conducting electricity be considered a physical or chemical property of zinc
i got physical but just want to make sure.
1 answer
398 views
A single 4p orbital can hold how many electrons?
i got 6 is that correct or no? Would conducting electricity be considered a
3 answers
424 views
The celcius scale is devised so that 0 degrees celcius is the freezing point of water ( at 1 atmosphere of pressure) and 100
2 answers
585 views
The normal body temperature in humans ranges from 97.6 degrees fahrenheit to 99.6 degrees fahrenheit. Concert this temperature
2 answers
487 views
Solve :
sec^2(x)= �ã3*tanx + 1 on [0,radian-180 degrees) - couldn't find the symbol for radian on computer please try and
2 answers
542 views
Solve for x:
lnx^3 - 2lnx = 1 Please try and show how you got the answer best as you can thank you :)
1 answer
445 views
As x increases from p/4 to 3p/2, the value of sin(x) :
A.increases throughout the interval B.decreases at first, then increases
2 answers
1,075 views
How many real solutions does the equation x+5=x have?
Please explain your answer to the best of your abilities thanks :)
3 answers
395 views
How many real solutions does the equation �ãx+5=x have?
Please explain your answer to the best of your abilities thanks :)
2 answers
816 views
Solve:
sec(x)^2= 3tanx +1 *** It is suppose to be the sqaure root of 3 but i could find the symbol so just wrote the 3 without it
2 answers
579 views
Find all possible radii of circle centered at (3,6) so that the circle intersects only one axis
2 answers
850 views
State the Domain and show work.
y = x + 2 / x^2 - 4x - 12
2 answers
914 views
DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction:
2 C 6 H 5 Cl (Chlorobenzene) + C 2
3 answers
1,601 views
Fond the limit of
lim x -> 3 [1/(x+4)] - (1/4) _________________ x
1 answer
390 views
Find the limiting reagent.
2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!
1 answer
383 views
Find the limiting reagent.
2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!
2 answers
527 views
ammonia gas reacts with copper (ii) oxide at high temperatures to produce elemental nitrogen, copper metal, and water vapor.
3 answers
1,104 views
Next, Tom remembers that he heard a doctor talking about something that takes two weeks to heal.
I have to identify what type of
1 answer
215 views
If 50 is the first number, what is the second number?
4 answers
648 views
What is the chemical name for Polyurethane and what does it look like at it's resting state?
1 answer
355 views
Verify that the Intermediate Value theorem applies to the indicated interval and find the value of c guaranteed by the theorem.
f
1 answer
952 views
Marcus want to make a stone walkway in his garden.the rectangular walkway will be 3 feet wide and 18 feet long.Each 2-foot by
6 answers
1,444 views
For every liter of sea water that evaporates, 3.70g of magnesium hydroxide are produced. How many liters of sea water must
1 answer
432 views
A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant external pressure of 2.00 atm at a
1 answer
911 views
H2O (l) requires the largest amount of energy to raise the temperature of 25.0g H2O of the substance from 15.0 *C to 37.0 *C.
4 answers
4,176 views
A sample of an ideal gas at 15.0 atm and 10.0 L is allowed to expand against a constant external pressure of 2.00 atm at a
1 answer
1,158 views
How do you represent data in a graph?
1 answer
385 views
How are the structures in genetics related?
1 answer
878 views
make up a data set of at least 12 numbers that have the following landmarks.
maximum 18 mode 7 range 13 median 12
1 answer
389 views
A(-1,-2) B(7,2)
show that the lenght AB may be written in the form p root5 wjere p is an integer to be found?? is then ans just
1 answer
328 views
what is the prime factorization of 72
1 answer
275 views
Find the 1st derivative of the function:
y = 1/4 sin^2 (2x) So confused...
3 answers
1,015 views
She will become a physicist one day.
Have to identify the verb or verb phrase and then tell if it contains a linking verb or does
5 answers
346 views
Determine the number of terms in the expression 14m - 16.
1 answer
863 views
how do you show that line 3x+y-2=0 is a tangent of the curve y=(4x-3)(x-2) and how to find the point of contact??
2 answers
491 views
A particle is moving along the curve y = 2 √{3 x + 7}. As the particle passes through the point (3, 8), its x-coordinate
2 answers
590 views
A particle is moving along the curve y = 2 √{3 x + 7}. As the particle passes through the point (3, 8), its x-coordinate
2 answers
578 views
Help!!
How many atoms in 3.45 mL of water? (H2O only;mL=g) and If you are out panning for gold and discover a nugget that is
1 answer
473 views
Find all the roots of the equation Sin(2x)=1/2 in the range of -pi<x<pi giving answers in radians as multiples of Pi
1 answer
433 views
the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7
2 answers
728 views
In the substitution reaction of 2-pentanol with sulfuric acid and sodium bromide, how many grams of sodium bromide and mL of
1 answer
501 views
I'm trying to figure out how this sentence should be correctly punctuated.
He soon found out that it was just what it was called,
1 answer
455 views
One way that safety enters into specifications is to specify the composition of a vapor in air that could burn if ignited. If
1 answer
503 views
Please correct my english!
Hello everybody! I'm not an english speaker, but currently study english at school. Our homework is to
3 answers
979 views
the curve y=x^2 - 3x - 4 cross the x-axis at P and Q. the tangent to the curve at P and Q meet at R. the normals to the curve at
0 answers
393 views
the curve y=x^2 - 3x - 4 cross the x-axis at P and Q. the tangent to the curve at P and Q meet at R. the normals to the curve at
3 answers
489 views
Action potentials: Tick the box next to the ONE answer you believe is TRUE.
A. compound action potentials increase in amplitude
1 answer
431 views
I'm after understanding more than an answer but an answer would be greatly appreciated.
The question reads as "On the answer
1 answer
1,034 views
I'm after understanding more than an answer but an answer would be greatly appreciated.
The question reads as "On the answer
3 answers
706 views
Students are often confused about the use of the words good and well in their writing. Write a 100-word passage to Susan Anker,
4 answers
670 views
Calculate the volume of the ramp in Figure 17 in three ways by integrating the area of the cross sections:
(a) Perpendicular to
2 answers
1,097 views
A 1.0 m cubed object floats in fresh water with 20% of it above the waterline. What does the object weigh out of the water?
4 answers
1,131 views
Calculate the volume of the ramp in Figure 17 in three ways by integrating the area of the cross sections:
(a) Perpendicular to
3 answers
1,002 views
When empty, a particular helicopter of mass 3770 kg can accelerate straight upward at a maximum acceleration of 1.29 m/s2. A
3 answers
465 views
Describe how Earth would be different today
if it contained no radioactive material. What would the consequences be for the
3 answers
681 views
(A.)
A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer
7 answers
1,809 views
(A.)
A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer
1 answer
743 views
if you have a apple juice mix of 5 cups concentrate to 8 cups water, if you only make 1 cup of mix, how much water and how much
2 answers
1,143 views
if possible, change each comparison of concentrate to water into a ratio. If not, explain why. a. the mix is 60% concentrate. b.
2 answers
699 views
Given 20.0 L of ammonia gas at 5C and 730 torr, calculate the volume at 50C and 800 torr
5 answers
1,546 views
Two questions?
Build a patio-hypotenuese is 50 feet long the two sides of patio are same. What is the length of one side of the
4 answers
469 views
If the probability of an event happening is 1/7, what are the odds against it happening? What is the ratio of the odds against
3 answers
1,027 views
Can the expression (r-3)(s+2) be simplified without knowing the values of r and s?
1 answer
300 views
A sweepstakes posted the odds and payoffs. Suppose that mailing the sweepstakes costs $0.33 and the odds in favor of winning the
1 answer
429 views
On the unit circle the coordinates of P(theta) are (0.588, 0.809). Find the coordinates of P(2theta). Please help.
1 answer
445 views
Determine the amount of energy required (in MeV) to dissociate the following
elements into component parts (protons, neutrons and
1 answer
389 views
Need to identify five adverbs in this paragraph. I think I am correct but would like a second opinion. Thanks for your thoughts.
3 answers
804 views
What do I do when writing the net ionic equation for Magnesium nitrate reacted with sodium chloride?
I've wrote out the molecular
2 answers
570 views
A golf ball is chipped at an angle of 49 degrees and with a speed of 8.5 m/s. How far does it travel to the nearest tenth of a
1 answer
370 views
How do I balance this equation and what is the answer?
C3H9N+O2-->CO2+H2O+NO2
2 answers
868 views
1 kg aluminum dumbbell initially held 2 meters above the floor is allowed to fall. This experiment is performed inside a room
2 answers
671 views
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