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hannah

Questions (468)

Suppose the Sun is 1.52669 × 108km from Earth. The speed of light is 2.99792 × 108 m/s. How long does it take for its light to
1. 1 answer
2. 711 views
A certain constant-pressure reaction is nonspontaneous at 37°C. The entropy change for the reaction is 83 J/K. What can you
1. 0 answers
2. 980 views
Express the second law of thermodynamics as a mathematical equation. (Select all that apply.)For a reversible process,
1. 1 answer
2. 640 views
the volume of 0.220 mol of an ideal gas at 34°C is increased isothermally from an initial volume of 12.0 L.If the final volume
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2. 583 views
how do chromosomes move inside a cell during each stage of cell division?
1. 1 answer
2. 995 views
Which of the following could be added to a solution of sodium acetate to produce a buffer? ?A) acetic acid only B) acetic acid
1. 1 answer
2. 3,923 views
In an excess of NH3(aq), Cu2+ ion forms a deep blue complex ion, Cu(NH3)42+, which has a formation constant Kf = 5.6 1011.
1. 5 answers
2. 2,360 views
how did the watergate scandal gain attention? and why was an investigation launched?
1. 1 answer
2. 504 views
Calculate the solubility of Mn(OH)2 in grams per liter when buffered at each of the following.(a) pH 7.7 (b) pH 9.6 (c) pH 11.3
1. 1 answer
2. 863 views
The molar solubility of MgF2 at 25°C is 1.2 10-3 mol/L. Calculate Ksp.i got the euqation ksp= [F-]^2[Mg]2+ and plugged in
1. 1 answer
2. 1,031 views
Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant have
1. 1 answer
2. 6,654 views
I am doing a research paper on senator Debbie Stabenow and I cant find some information.What are her years of experience,
1. 3 answers
2. 406 views
Classify each statement as sometimes, always, or never true.A. 2^(2/3)*4^(4/3)=8*2^(1/3) B. If x>0, then (squareroot
1. 0 answers
2. 498 views
Assume that 35.0 mL of a 0.13 M solution of a weak base B that accepts one proton is titrated with a 0.13 M solution of the
1. 1 answer
2. 1,139 views
Calculate the pH at the equivalence point in titrating 0.100 M solutions of each of the following with 0.080 M NaOH.chlorous
1. 2 answers
2. 1,648 views
Why is an echo weaker than the originalsound? 1. The echo has a shorter wavelength than the original sound due to the
1. 3 answers
2. 1,772 views
If the intensity of a person’s voice is 3.6×10−7W/m2 at a distance of 2.1 m, how much sound power does that person
1. 0 answers
2. 753 views
How many grams of NH4Cl must be added to 0.560 L of 1.90 M NH3 solution to yield a buffer solution with a pH of 8.50? Assume no
1. 3 answers
2. 3,560 views
What CH3COONa concentration is required to prepare a buffer solution with a pH of 4.80 if [CH3COOH] = 0.150 M? Ka of CH3COOH =
1. 4 answers
2. 914 views
Acetic acid, CH3CO2H, is the active ingredient in vinegar. It's often abbreviated "HOAc". Vinegar is acidic because acetic acid
1. 4 answers
2. 962 views
Indicate whether the pH increases, decreases, or remains the same when each of the following is added.(CH3NH3)Cl to a solution
1. 2 answers
2. 893 views
Ecological ________ - normal, gradual changes that occur in the types of species that live in an area.Help please and help me
1. 1 answer
2. 459 views
For each of the following reactions, predict whether the equilibrium lies predominantly to the left or to the right.HCN(aq) +
1. 3 answers
2. 1,081 views
An ocean wave travels 17.1 m in 6.7 s. Thedistance between the two nearest wave crests is 5.1 m. What is the frequency of the
1. 1 answer
2. 1,068 views
hi my name is Hannah and I need help with my math homework it is something to do with multiplying trapezoids and triangles?
1. 4 answers
2. 392 views
Phenylacetic acid (C6H5CH2COOH) is one of the substances that accumulates in the blood of people with phenylketonuria, an
1. 2 answers
2. 3,518 views
Calculate [OH- ] and pH for each of the following strong base solutions. (Kw = 1.0 10-14.)3.155 g of KOH in 460.0 mL of
1. 1 answer
2. 469 views
Calculate the pH of each of the following strong acid solutions.0.697 g of HClO3 in 2.97 L of solution. so i convenrted grams to
1. 2 answers
2. 598 views
What is atmospheric pressure?A. Pressure of the air inside the body B. Pressure of the air outside the body C. Pressure of the
1. 2 answers
2. 721 views
a flowerpot falls from a window ledge far above the street. Some distance down, phil fizyks observes that the pot takes 0.25
1. 2 answers
2. 852 views
a bowling lane is 16.5m long. A young bowler throws a strike and hears the pins striking the floor 4.1 seconds after releasing
1. 1 answer
2. 527 views
a bowling lane is 16.5m long. A young bowler throws a strike and hears the pins striking the floor 4.1 seconds after releasing
1. 1 answer
2. 603 views
In a thundercloud there may be an electriccharge of 54 C near the top of the cloud and −54 C near the bottom of the cloud. If
1. 1 answer
2. 1,334 views
NH4HS(s) <-> NH3(g) + H2S(g)An equilibrium mixture of this reaction at a certain temperature was found to have (NH3)=.268 and
1. 1 answer
2. 757 views
NH4HS(s) <-> NH3(g) + H2S(g)An equilibrium mixture of this reaction at a certain temperature was found to have (NH3)=.268 and
1. 1 answer
2. 1,205 views
10+2n=8n-8(+8)
1. 1 answer
2. 232 views
please help solved the following fraction11 13/15 + 3 7/12 = 14 3/4 + 7 + 5 7/8 = Thanks, Hannah
1. 9 answers
2. 310 views
how did the invention of the microscope help doctors to understand what caused diseases.
1. 1 answer
2. 407 views
I don't know how to change 1/3 and 2 1/3into a decimal and still show my work
1. 3 answers
2. 938 views
why are cultivation practices for pest control not widely used today?
1. 3 answers
2. 512 views
a parking meter gives 30 minutes for each quarter and 6 minutes for each nickel. the equation 30x+6y=60 describes the number of
1. 1 answer
2. 2,331 views
what is the meaning of fertilization?
1. 2 answers
2. 754 views
about 7x10 to the power of 3 babies are born each day in the city. about how many babies are born each day in the city?.give the
1. 1 answer
2. 548 views
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
1. 2 answers
2. 991 views
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
1. 1 answer
2. 347 views
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
1. 1 answer
2. 372 views
A projectile is launched off of a 18.6 m high cliff with a velocity of 12.8 m/s. If the projectile is launched at an angle of
1. 0 answers
2. 633 views
i am writing a literary research paper on the book robinson crusoe. my thesis is In "Robinson Crusoe" Daniel Defoe uses the
1. 1 answer
2. 1,067 views
a chemist puts 6 moles of nitrogen gas and 7 moles hydrogen gas into an evacuated 1 liter container. The system reaches
1. 1 answer
2. 1,004 views
Consider the following equations.N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ H2(g)
1. 2 answers
2. 931 views
Consider the following equations.N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ H2(g)
1. 4 answers
2. 1,417 views
Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will
1. 2 answers
2. 864 views
(a) When a 4.75-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter (see figure), the
1. 0 answers
2. 724 views
When is the best time to read review or discussion questions?A. Immediately after you have finished all of the reading. B. After
1. 1 answer
2. 698 views
what is the purpose of the labor law- executive order- created in 1965
1. 1 answer
2. 829 views
I am trying to figure out what functional group the compound CH2ClCH3 is in.I know that it is not a ketone, alcohol, ester,
1. 2 answers
2. 1,142 views
identify the functional group and indicate polar bonds by assigning partial positive and negative charges.1) The structure
1. 1 answer
2. 562 views
I am trying to figure out what functional group the compound CH2ClCH3 is in.I know that it is not a ketone, alcohol, ester,
1. 0 answers
2. 520 views
identify the functional group and indicate polar bonds by assigning partial positive and negative charges.1) The structure
1. 0 answers
2. 491 views
Do veterinarians get paid during residency? If so how much?
1. 3 answers
2. 344 views
the world record for the 100 meter butterfly swim set in 1999 was 51.81 sec. What was the average rate per second? thx:)
1. 1 answer
2. 487 views
The narrator points out that Emily, who has only recently blossomed, struggled with her appearance in the past.What this means..
1. 1 answer
2. 365 views
Each beta particle has an energy of 2.51 10-14 J, and 7.5% of the radiation is absorbed by the person. Assuming that the
1. 1 answer
2. 610 views
Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy unit must be replaced when
1. 1 answer
2. 3,394 views
solve for the equation or formula for the specified variablex+y-a=b,for y over Z
1. 1 answer
2. 436 views
As the mass of the particle is increased while the speed of the particles remains the same, would you expect the bending to
1. 1 answer
2. 1,728 views
calculate10^1.27 how do i do this?
1. 4 answers
2. 348 views
is increasing the current a valid method to increase the induced voltage when a magnet moves into a solenoid?
1. 0 answers
2. 383 views
HELP PLEASE! I don't understand how to do the problem! Please help thanks(:The problem is: your bike tire has a radius of 14
1. 1 answer
2. 525 views
i need help depicting a poem using literary terms. The poem is Dear Sister and goes:Do not believe what all you read in the
1. 1 answer
2. 534 views
How many innocent South Vietnamese citizens were killed during the Vietnam war?
1. 1 answer
2. 417 views
Calculate the power of a device that requires 1.98 mA at 25.5 V.I know how to do the problem. i am just confused on how to
1. 1 answer
2. 437 views
is insomnia the same thing as sleep deprivation. im pretty sure they are different but i just wanted to check. also what in the
1. 1 answer
2. 1,004 views
discuss spatial and temporal summation
1. 0 answers
2. 370 views
A 520 Hz tuning fork produces a standing wave in a column of air in a closed tube. If the speed of sound is 340 m/s, what is the
1. 1 answer
2. 506 views
a) What is the frequency of a photon of UV radiation ( = 2.00 x 10^-7 m)? (b) Calculate the energy of a photon of UV radiation.(
1. 0 answers
2. 973 views
In black-and-white photography, a photon energy of about 4.00 x 10-19 J is needed to bringabout the changes in the silver
1. 1 answer
2. 1,455 views
15 At a particular location and time, sunlight is measured on a 1 m2 solar collector with anintensity of 500.0 W. If the peak
1. 3 answers
2. 2,597 views
A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.50 x 105
1. 0 answers
2. 779 views
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of
1. 2 answers
2. 617 views
for the following, mix the equal volumes of one solution from group I with one solution from group II to achieve the indicated
1. 0 answers
2. 860 views
Without knowing the context of of the poem, does this poem title stand out to you, get your attention, and sound good?He Makes
1. 2 answers
2. 605 views
What is the diference between formal and technical language in speech?thanks
1. 1 answer
2. 837 views
What is the molarity if 750. mL of a solution containing 332.5g of copper (II) sulfate
1. 1 answer
2. 451 views
what do you think were the 15 most important events in us history between the founding of jamestown(1600's) and the end of the
1. 1 answer
2. 709 views
"big and solid as twelve pounds of mashed potatoes in an eight-pound bag" is an example of what?
1. 1 answer
2. 397 views
the effects of mood and gender on proxemics
1. 1 answer
2. 322 views
Earths mass is 6 x 10^24kg and its radius is 6.38 x 10^6m(6380 km ). Use the inverse-square law to show that in space-shuttle
1. 1 answer
2. 863 views
What was Scott Joplin most known for duirng the 1920's? please do not just give me a url to a site with his biography because i
1. 1 answer
2. 458 views
I need a statistic of how many dogs and cats are currently in a foster home in the us. Does anyone know a website that has this
1. 0 answers
2. 507 views
how would i find the area of the parallelogram if the area of each right triangle region is 7 1/2 square inches
1. 1 answer
2. 503 views
a store has a total of 108 full-time staff and part time staff. There are three times as many full-time staff as part time
1. 1 answer
2. 852 views
what offically started and ended WWI? and what made the us enter the war?
1. 1 answer
2. 1,082 views
where in the book The Importance of Being Earnest does the author make fun of the victorian value of Social Responsibility?
1. 0 answers
2. 449 views
How do you find the derivative of (6 csc x)/x?
1. 1 answer
2. 478 views
how do u find the derivative of (csc x)^7 -cos 4x???
1. 4 answers
2. 384 views
how long does a teenager need to sleep at night??my teacher asked this question and if you get it right, you get 2 extra points
1. 2 answers
2. 507 views
Where is pride and prejudice does mr. bennet confess that he married mrs. bennet because of her looks?a volume and chapter would
1. 0 answers
2. 521 views
If you enter Interstate 40 at mile marker 23 in Sayre, Oklahoma, how far would you need to travel to reach mile marker 125 in El
1. 1 answer
2. 564 views
When were hunter gatherers around in america? why and when(a date or range would be great) did they settle down?
1. 1 answer
2. 505 views

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