# Posts by Jessica

Total # Posts: 3,345

**Chemistry**

How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^-5. I just wanted to make sure I dd this write, can you please check my work? Thank you!!!! I found the pKa ...

**Geography**

Graticules on small scale map represents ________ and ______. Graticules on large scale map represents ________ and ______.

**physics**

2. A tiger jumps horizontally off of a 1.7 meter tall rock with a velocity of 3.2. How far from the base of the rock does the tiger land?

**english**

Please tell me the anthropological perspective. Is the culture, the cross-disciplinary discipline etc? Thanks!

**writing essay**

Well, you know what I would recommend you to contact Supreme essay service whenever you need some help in writing. Those guys are real professionals in what they do. The answer is 'B'. All the best!

**Biology**

Using Darwin’s Theory of Evolution, describe how Eukaryotic cells could have developed from Prokaryotic cells. What advantages would the Eukaryotic cells have over the Prokaryotic?

**chemistry**

yes thank you the 1st one was considered strong :)

**chemistry**

a)H2SO4 b)CuS c)HF d)Zn(NO3)2 Which are strong, weak, or non electrolytes. I was think A was strong B and C were weak and D is non

**Chemistry**

Find the standard entropy (S^0) of ice at 25K. delta Hfus = 6009 J/mol and Cp of ice = 38 J/molK.

**Algebra**

The larger of two numbers is 23. if three times the number is 5 more than eight times the smaller, find the smaller number.

**Physics**

A motorist travelling at 107 km/hr is being chased by a police car at 133 km/hr. If the police car starts from 3.0 km back, how long does it take to catch the motorist? Leave time in hours

**Mechanics**

When a problem is statically indeterminate, what additional equations do you need to solve?

**Physics**

i don't get how to get rid of all the t's...

**Physics**

A hot air balloon is rising at a constant velocity of 13.3 m/s. When the balloon is at a height of 15 m, a heavy object is dropped overboard. IF air resistance on the object is neglected, how long does it take for it to reach the ground?

**Physics**

You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 113 N, the sled has an acceleration of 1.3 m/s2 If the sled has a mass of 6.6 kg, what is the mass of your little sister?

**Mechanics**

What does a polar moment of inertia depend on?

**Math**

A triangle and trapezoid share a 15 inch base and a height of 10 inches. For what values of b is the area of the trapezoid less than twice the area of the triangle?

**biology**

what is activation energy?

**math stats**

you draw from a deck. if you get a red card you win nothing. if you get a spade you win $5. for any club you win $10 plus an extra $20 for the ace of clubs. A. create a probability model for the amount you win. B. Find the expected amount you will win. C. What would you be ...

**Statistics**

A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?

**Statistics**

A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?

**english writing**

what does the word class means to you? Why or why not?

**Chemistry**

A mixture contains only CuCl2 and FeCl3. A 0.7391 g sample of the mixture is completely dissolved in water and treated with silver nitrate. if 86.91 mL of 0.1463 M silver nitrate soultion is needed to precipitate all the chloride as silver chloride, what is the weight percent ...

**Chemistry**

An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the percent (w/w), percent (w/v), parts per million, and molality?

**Chemistry**

The manufacture of ethanol (CH3CH2OH) yields diethyl ether ((C2H5)2O) as a by product. the complete combustion of a 1.005 g sample of the manufactured product yielded 1.963 g of carbon dioxide. what are the weight percents of ethanol and diethyl ether in the sample?

**Chemistry**

Aluminum metal and Iron(III) oxide react to give aluminum and iron metal. What is the maximum amount of Iron that can be obtained from a reaction mixture containing 2.5 grams of aluminum and 9.5 grams of Iron(III) oxide? What mass of excess reactant remains?

**Chemistry**

An aqueous solution with a density of 0.998 g/ml at 20 degrees Celsius is prepared by dissolving 12.8 mL of CH3CH2CH2OH (p=0.803 g/mL) in enough water to make 75.0 mL of solution calculate the molarity

**History**

The monroe doctrine was proclaimed in repose to revolution in____________. southern europe or latin america. I choose latin america

**English**

how to write a newspaper review?

**english**

Please tell me which of these two are Implicit statement and implicit premises or conclusions and please tell me the difference, I have quiz on this. Thanks! 1)Hilter rose to power because the Allies had crushed the German economy after workd war one. Therefore if the Allies ...

**calculus**

Find the slope of the curve at the indicated point. f(x)= abs(x) at a. x=2 b. x=-3 f(x)= abs(x-2) at a. x-1

**history**

i'm sorry it's suppose to be.... was the proposed capitol philadelphia

**history**

Before the change to a site on the potomac the was the proposed capitol philadelphia?

**Math**

The ratio of a rectangle is 3:4, its perimeter is 32in. What are the lengths of the sides?

**trig**

Find a cofunction with the same value as sin 19 degrees

**help please**

The pattern of learning that is strongest is called : A.learning modality B.intelligence activity C.learning style D.both a&c I got c what do you think?

**help please**

A is correct answer or not?

**United States Government**

Which of the following would NOT be advocated by modern conservatism? a. Free markets b. Small governments c. Laissez-faire economics d. Welfare programs e. Reliance on tradition I would say Reliance on tradition. what say?

**Algebra II**

I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes yesterday , but I'm wondering if it is suppose to have anything else done to it-it seems ...

**algebra II**

I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes, but I'm wondering if it suppose to have anything else done to it-it seems way too easy ...

**chemistry**

analyze and explain the buffer system in buffered aspirin(carboxyic acid)

**Algebra II**

I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? Also, someone said yes, but I'm wondering if it suppose to have anything else done to it-it seems way too easy ...

**Algebra II-Please recheck**

Is that in simplest form or am I suppose to do something else with it? It seems too easy-

**Algebra II**

the first step should be x^2+2x-2x-4 = x^2-4(I forgot to put the (-4)

**Algebra II**

I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and 4. I have to gt rid of the parentheses by multiplying everything out.Did I do it correctly? (x-2)(x+2)(x-4)original problem 1.x^2 + 2x-2x=x^2-4) 2. (x^2-4)(x-4) 3. x^3-4x^2-4x+16=0

**government**

first result was this page XD

**government**

Do voter ID laws conflict with anything in the Constitution besides, situationally, the 24th Amendment?

**math**

15 1/36 - 1 1/9+3 1/3

**english**

Hi, I need help finding these 3 questions please: I couldn't find them, thanks!!(1) what are the ethical concerns of embryonic stem cell research? (2) what are the benefits of related to adult stem cell reseach? (3) who are the voices in our society who will decide on how ...

**Alg**

.Write an algebraic expressoin for4 times the sum of q and p HELPPP PLZZZ :)

**geometry**

if n is a prime number than n +1 is not . True or false

**geometry**

if n is a prime number than n +1 is not . True or false

**physics**

A car is driven east for a distance of 41 km, then north for 21 km, and then in a direction 30° east of north for 25 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...

**PHYSICS**

its going to be 58x10^2 or 5.8x10^3

**Reading**

All of the little things. Like where the story takes place, when the time frame is, what the characters look like.. etc.

**English**

What all should I include in my intro paragraph for a 5 paragraph essay? My topic is about how people take eyesight for granted.

**English**

winter and carnival need to be capitalized because it is the name of a specific carnival.

**Chemistry**

They are both the same thing?

**Math linear functions**

The line through (-10, 2) which is perpendicular to the line y=8x+9 has slope -1/8 and y-intercept __?

**Math**

An equation of the line through (6, -8) which is parallel to the line −8x−9y=6 is __?

**Math**

An equation of a line through (-10, -6) which is perpendicular to the line −5x+8y=−1 is __?

**college math**

given the bar graph below create a grouped frequency distribution. the graph is numbered up the side by twos to 22, along the bottom there are countries that go up to a number. united states up to 10 argentina up to 22 united kingdom up to just under the ten phillipines is ...

**History**

Thanks so much Ms. Sue.This is what I have so far can you tell me what you think and if you have any more ideas that i can add to make it better would be great. The French and Indian War left Great Britain in much debt. To pay off war debt and cover the cost of administering ...

**History**

Was there a single event that caused the Revolutionary War and was that war avoidable?

**physics**

A traditional unit of length in Japan is the ken (1 ken = 1.97 m). What is the volume of a cylindrical water tank of height 7.17 kens and radius 6.21 kens in cubic kens

**physics**

it didn't work

**physics**

Earth has a mass of 5.98 × 1024 kg. The average mass of the atoms that make up Earth is 40 u. How many atoms are there in Earth?

**physics**

how am i suppose to know how much the mistaken tourist believe she needs?

**physics**

A tourist purchases a car in England and ships it home to the United States. The car sticker advertised that the car's fuel consumption was at the rate of 40 miles per gallon on the open road. The tourist does not realize that the U.K. gallon differs from the U.S. gallon: ...

**physics**

Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold with a mass of 8.464 g, is pressed into a leaf of 5.036 ìm thickness, what is the area (in m2) of the leaf? (b...

**chem**

because of the electrons they share

**physics**

A person on a diet might lose 1.5 kg per week. Express the mass loss rate in milligrams per second, as if the dieter could sense the second-by-second loss

**geometry**

@ Ms.Sue 6cm

**geometry**

a circle has a circumference of 6c. Find the diametermof the circle

**geometry**

rectangles length is 3 more than twice its width and has a perimeter of 30 centimeters find the dimensions

**Physics**

Two point charges, Q1 = -7.0 and Q2 = 2.0 are located between two oppositely charged parallel plates, as shown in the figure . The two charges are separated by a distance of x = 0.33m . Assume that the electric field produced by the charged plates is uniform and equal to E = 6...

**chemistry**

B-Mercaptoethanol is available as a 98% (w/w) solution, sp gr 1.114. What voulume is needed to prepare 0.100 L of a 50.0 mM solution. fw=78.13

**Chemistry**

given 6.7 grams of sodium acetate and 6.7 g of magnesium acetate, calculate the number of moles of acetate in sodium acetate. calculate the number of moles of acetate in magnesium acetate.

**chemistry**

if there are 8.0 mg of Na+ contaminant per liter of water sample, calculate the number of moles of Na+ per liter. Calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L

**geometry**

Angle C is an inscribed angle of circle P. Angle C measures (-3x - 6)° and arc AB measures (-4x)° . Find x. circle P with points A, B, and C on the circle and inscribed angle A C B drawn Question 4 answers -2 -4 -6 -8

**Chem**

Well I got Iron(3)hydroxide as a solid and NaNo3 as aqueous..... Not sure if that is right but that's my best guess as of right now....

**Chem**

Solid ferric nitrate and aqueous sodium hydroxide are combined with water in a test tube. A brown to red precipitate forms in the test tube. Write a complete chemical reaction that accounts for the formation of the solid.

**Chemistry**

A stock aqueous solution contains 348.29 grams of NaCl per 1.000L. 68.00mLs of water is added to 10.00mLs of the stock solution. What is the molarity of the dilution???

**geometry**

rectangles length is 3 more than twice its width and has a perimeter of 30 centimeters find the dimensions

**geometry**

Yeah it can. Point J is the mid-point already figured it out..

**geometry**

suppose point J is between points H and J. Let HJ=2x+5,JK=3x-7,and KH=18. Find the length

**anatomy**

where are the shoulders relative to these parts? 1. throat (inferior) 2. hip (superior) 3. ears (inferior) 4. hands (superior) 5. eyes (inferior) will someone please take a look at my answers and tell my if i am right

**math**

In Philadelphia the number of hours of daylight on day t (where t is the number of days after Jan. 1) is modeled by the function L(t)= 12+2.83sin(2pi/365(t-365)) A) Which days of the year have about 10 hours of daylight? B) Which days of the year have more than 10 hours of ...

**calc**

sin(4x)/sin(x)=4cos(x)cos(x) verify the identity

**calculus**

Consider a gun fired from a tower 96ft above the ground. The angle of elevation of the gun is 60 degrees, and its muzzle velocity is 1600 ft/sec (also gravity in this equation is 32 ft/sec^2). a)When does the bullet hit the ground? b)Write a parametric equation that models the...

**physical science 101**

A) h=0.5gt^2 40=0.5(9.8)(t^2) 40=4.9t^2 t^2=8.16 t=2.86s

**COM155**

Write two paragraphs about how interest rates affect our purchasing decisions. High interest rates make us stop and think, do we need this item? Is it a necessity? When interest rates are high people tend to finance things less. Why pay a lot in interest when you can just ...

**History**

The answer to the first question is TRUE! I hope i was able to help you!!!

**health**

what are possible impact of not logging off or exit from the patient's record

**history**

what new ideas in technology occurred during the Greco-Roman civilization?

**Computers**

Give an example of where you might use Word, Excel, Access, and Powerpoint other than computer class?

**Math**

find a quadratic equation having 3+root3 and 3-root3

**math**

A library crew can shelve books in six hours. Another crew can do the job in four hours. If the first crew begins and is joined by the second crew one hour later, how many hours will it take to finish the job?

**math**

find a quadratic function whose graph has a max of 25 and x-intercepts of -3 and 2.

**math**

when graphing greater than, less than, etc. do you shade and if you do which way do I shade?