Questions and answers by

Hannah

Questions (2,007)

How much energy is released when 1 gram of steam condenses to water at 100 degrees Celsius?
1. 0 answers
2. 997 views
what is the number of grams of steam at 100 degrees C that will condense as 5g of ice at 0 degrees C melts?
1. 0 answers
2. 863 views
if 8100 calories are released from 200g of steam at 100C, how much of the steam condenses?
1. 0 answers
2. 591 views
disappearance of NO in ...- Help!!!?The following data were collected for the rate of disappearance of NO in the reaction 2
1. 4 answers
2. 11,658 views
Jet #1 leaves an airport at 600 km/h. Jet #2 leaves 3/4 hour after jet #1 in same direction. How long until jet #2 overtakes jet
1. 1 answer
2. 594 views
Using data from this table of molal boiling-point-elevation and freezing-point-depression constants, calculate the freezing and
1. 0 answers
2. 889 views
What is the osmotic pressure formed by dissolving 50.8 mg of aspirin (C9H8O4) in 0.200 L of water at 18°C?
1. 3 answers
2. 549 views
For the problem(8.99 X 10^9 NM^2/c^2)(1 X 10^-6c) / (.1m)^2 = .90 N When I put this in my calculator I did not get .90N. Am I
1. 1 answer
2. 394 views
A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20
1. 3 answers
2. 1,091 views
What is the concentration in mol/L of a CuSO4 solution containg 1.0 mole of CuSO4 in 250 mL of Solution?I would like to know how
1. 1 answer
2. 1,090 views
As a general rule, homeowners should carry property damage insurance on their structures amounting to at least ____ percent of
1. 1 answer
2. 405 views
Can't remember the way to solve for the variable. 5x + 6 = 7x. Answer is 3, but how to do other problems?
1. 1 answer
2. 381 views
-13=5(1+4m)-2m
1. 1 answer
2. 564 views
If a saline solution has a concentration of 0.25 g per mL, calculate the following.a) The concentration of this solution in
1. 1 answer
2. 600 views
Convert to standard form (AX+BY=C)1.y=3/2x+6 2. 2/3y=2x-5 3.7y-21=1/2x 4.-2/3x+3/4y=1 Convert to Slope/intercept form (y=mx+b)
1. 1 answer
2. 640 views
Find the x and y intercept of the equations.1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
1. 1 answer
2. 405 views
Find the x and y intercept of the equations.1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
1. 0 answers
2. 425 views
Find the x and y intercept of the equations.1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
1. 0 answers
2. 446 views
For an experiment on specific heat capacities my data for measured specifi heats was consistently higher than the accepted
1. 2 answers
2. 549 views
I am trying to draw a constitutional isomer for the compound CH3CH=CHCH3 but I am having some trouble.H-C-C=C-C-H I drew the
1. 1 answer
2. 566 views
For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some
1. 1 answer
2. 560 views
For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some
1. 1 answer
2. 688 views
I know that to calculate the specific rotation for a compound you doobserved rotation / path length(dm) * conc. (g/ml). I am
1. 6 answers
2. 1,270 views
Determine if the equation is SN1, SN2,E2 or E1.CH3CH2O- + CH3CH2BR = CH3CH2OCH2CH3 + BR- I think that this is SN2. Would you
1. 2 answers
2. 993 views
The average temperature, in °F, for Atlanta, GA is modeled by the sinusoidal function y = 18.25 sin(pi/6 t - 2.09) + 61.15
1. 1 answer
2. 1,206 views
How many chirality centers does the compound 1,3-dibromo-2,4-dichloro-5-fluorocyclopentane have?This compound has three
1. 1 answer
2. 979 views
850 hectare = ? km^2850 ha (1 km/100 ha) = 8.5km^2 Is this conversions correct? not just the answer but also how I got to the
1. 1 answer
2. 476 views
Change 300 mm3(cubed) to cm3(cubed).I have no idea how to work this out. Any help you can give me would be greatly appreciated!!
1. 0 answers
2. 365 views
For C4H10O a constitutional isomer can be written as C-C-C-C-O-H with hydrogens also coming off of the 4 carbons. I know that
1. 0 answers
2. 472 views
For C4H10O a constitutional isomer can be written as C-C-C-C-O-H with hydrogens also coming off of the 4 carbons. I know that
1. 0 answers
2. 509 views
For an experiement to test elastic collision, ball 2 was at rest and ball 1 was released from a certain height and distance and
1. 0 answers
2. 487 views
For an experiement to test elastic collision, ball 2 was at rest and ball 1 was released from a certain height and distance and
1. 2 answers
2. 618 views
A skydiver who jumps out of a plane that has a forward velocity of 40 m/s. That means that the skydiver has a forward velocity
1. 0 answers
2. 1,280 views
I have to answer the following questions about C3H7Cl:Are there different constitutional isomers for this formula, are there
1. 3 answers
2. 3,093 views
I have to answer the following questions about C3H7Cl:Are there different constitutional isomers for this formula, are there
1. 0 answers
2. 566 views
Which of these statements concerning the interaction of light waves with the glass of a greenhouse is correct?A. Infrared is
1. 1 answer
2. 1,024 views
A 410-m-wide river has a uniform flow speed of 2.0 m/s through a jungle and toward the east. An explorer wishes to leave a small
1. 1 answer
2. 1,797 views
Using a force table the direction and magnitude had to be found for the following measurements:F1 = 200 grams at 30 degrees; F2
1. 1 answer
2. 1,100 views
Using a force table the direction and magnitude had to be found for the following measurements:F1 = 200 grams at 30 degrees; F2
1. 2 answers
2. 478 views
At what temperature do KCL and KNO3 have the same solubilityIf a saturated solution of KNO3 at 20.0 C is heated to 80.0 how much
1. 0 answers
2. 1,360 views
an acid with the equilibrium concentration is listed below:1) HA + H2O = H3O^+ + A- HA= 10^-1 M, H3O=10^-3M, A=10^-3M Calculate
1. 1 answer
2. 614 views
List the conjugate base for the following acids:1) Acid = CH3CH2CH2NH3^+ Conjugate base = CH3CH2CH2NH2^- 2) Acid =
1. 2 answers
2. 3,687 views
y=1.5 + 76.95t-(1/2)(9.8)t2 = 303.6I am not sure how to arrive at this answer. I am confused because there is a t and a t^2.
1. 5 answers
2. 402 views
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its
1. 0 answers
2. 545 views
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its
1. 1 answer
2. 505 views
This is the same equation as before just with different numbers.y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 =
1. 2 answers
2. 595 views
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am
1. 0 answers
2. 776 views
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am
1. 1 answer
2. 431 views
This is the same equation as before just with different numbers.y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 =
1. 0 answers
2. 473 views
If A=(0,-17), B=(4,-5), and C=(12, -1), what is the length of the altitude from C to AB
1. 1 answer
2. 335 views
The points (2,1), (4,0), and (-4,k^2) are collinear. What is the value of k?
1. 1 answer
2. 423 views
How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am
1. 0 answers
2. 416 views
I have to calculate the percent error for my experiment and I just wanted to make sure that I am doing it correctly.My value was
1. 2 answers
2. 594 views
This is the same equation as before just with different numbers.y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 =
1. 2 answers
2. 1,153 views
In the condensed structureCH3CH2CHCH double bonded to CHCH(CH3)2 ! CH3 What does it mean when the CH3 is in () followed by the
1. 5 answers
2. 629 views
Last question, I just want to make sure I understand the concept of hybridization.For carboxylic acid the hybridization is: CH3=
1. 1 answer
2. 483 views
What is the hybridization of each carbon in the molecule of ethanol.CH3 = sp3 CH2OH = sp3 I think that the carbons are all sp3
1. 1 answer
2. 1,687 views
Using the equationy=yo + (vo sin Q) t - 1/2gt^2 I have to find t. The values for y, yo and vo were given to me. So I set the
1. 8 answers
2. 680 views
Classify the following:1) CH2 CH2 ! ! CH2
1. 3 answers
2. 515 views
Classify the following:1)CH3CHCH2COOH ! CH3 I think this is a carboxylic acid because of the COOH attached. Would you agree?
1. 1 answer
2. 510 views
Classify the following:1) CH3CN There is a triple bond between the C and N. I am really not sure what compound this is.
1. 4 answers
2. 488 views
Classify the following as ether, ketone, ester, amide, etc.1) CH3CH2CNH2 !! O The !! represents a double bond and it is below
1. 2 answers
2. 592 views
using the equationy=yo + (vo sin Q) t - 1/2gt^2 I have to find t. The values for y, yo and vo were given to me. So I set the
1. 0 answers
2. 495 views
X=(Vo cos Q) tX=(3.107 cos 0)(0.443) I just wanted to make sure that I put this equation into my calculator correctly. I have a
1. 1 answer
2. 489 views
Plz help lisa is painting a fence that is 26 feet long and 7 feet tall. A gallon of paint will cover 350 square feet. Write and
1. 5 answers
2. 1,672 views
An assembly line worker at rob's bicycle factory adds a seat to a bicycle at a rate of 2 seats in 11 minutes. Write a proportion
1. 2 answers
2. 692 views
Classify the following functional groups:1)CH3CH = CH2 I think this is an alkene 2) CH3CHCH3 I think it is an alcohol. ! OH
1. 1 answer
2. 480 views
When drawing a kekule structure forCH3CH2OH(alcohol) do I leave the OH at the end just like it is (OH) or would it be shown as
1. 5 answers
2. 1,092 views
What is the difference between the lithosphere and the asthenosphere? In which layer is each located?
1. 0 answers
2. 546 views
A watch is to be electroplated with gold.- provide a solution that would make a suitable electrolyte for this cell. I'm not
1. 0 answers
2. 449 views
A watch is to be electroplated with gold.- provide a solution that would make a suitable electrolyte for this cell. This is the
1. 0 answers
2. 452 views
What is the volume of 75.65 grams of zinc
1. 0 answers
2. 387 views
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig
1. 1 answer
2. 2,170 views
An experiment was done where a tiny steel ball was measured with a micrometer. I know I already posted a question about this
1. 1 answer
2. 586 views
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig
1. 0 answers
2. 587 views
What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig
1. 0 answers
2. 826 views
An experiment was done where a tiny steel ball was measured with a micrometer. I know I already posted a question about this
1. 1 answer
2. 618 views
I had to do an experiment where a tiny steel ball was measured using a micrometer. There was then a series of calculations that
1. 1 answer
2. 954 views
I am trying to calculate my percent error for an experiment conducted. I need to compare my average density calculated to the
1. 5 answers
2. 1,058 views
i have no idea how to set this problem up! please help!A 22.19-g sample of a solid is placed in a flask. Toluene, in which the
1. 1 answer
2. 647 views
The density of air at ordinary atmospheric pressure and 25°C is 1.19 g/L. What is the mass, in kilograms, of the air in a room
1. 1 answer
2. 854 views
Consider the reduction of 4-t-butylcyclohexanone.If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of
1. 4 answers
2. 3,338 views
In TLC, why do you spot multiple times? Select one or more correct answers.A. To fill the capillary almost instantly by
1. 2 answers
2. 1,275 views
Consider the reduction of 4-t-butylcyclohexanone.If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of
1. 0 answers
2. 740 views
In TLC, why do you spot multiple times? Select one or more correct answers.A. To fill the capillary almost instantly by
1. 2 answers
2. 467 views
Consider the reduction of 4-t-butylcyclohexanone.If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of
1. 1 answer
2. 3,273 views
do this using the appropriate number of sig figs320.44 − (3104.1/2.6) i got -880 as my answer and it said to check my sig
1. 6 answers
2. 1,019 views
Indicate which of the following are exact numbers. the mass of a stapler? i think its inexact because all staplers are different
1. 0 answers
2. 599 views
I am having trouble with my sig figsMany scientific data are reported at 25°C. What is this temperature in kelvins and in
1. 2 answers
2. 1,121 views
I am writing an essay and am not sure If I should combine these two sentences with a semi colon or just leave them separate.
1. 1 answer
2. 641 views
Suggest a procedure that could be used to remove lead (II) ions from industrial waste water as a precipitate. Provide an
1. 2 answers
2. 472 views
Find the error. Sam is finding 9-6+2. Find his mistake and correct it. Steps: First solve the problem. Second, write a summary
1. 1 answer
2. 599 views
Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium
1. 1 answer
2. 1,024 views
(-8/5)^7/4*(-8/5)^1/4=64/25Not sure how get this answer . Could please show me the steps.
1. 1 answer
2. 321 views
The two strings have the same tension and mass per unit length, but they differ in length by 0.54 cm. The waves on the shorter
1. 0 answers
2. 642 views
A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial
1. 0 answers
2. 673 views
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy
1. 1 answer
2. 1,232 views
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy
1. 0 answers
2. 1,061 views
A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial
1. 1 answer
2. 995 views
What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0800 m, length = 3.60 m) that can be used to build a raft
1. 1 answer
2. 880 views