# Posts by Ethan

Total # Posts: 277

**Chemistry**

A 0.8870-g mixture of sodium chloride and potassium chloride is dissolved in water and silver nitrate is added. The AgCl that precipitates has a mass of 1.913 g. Calculate the percent by mass of potassium in the initial mixture?

**Algebra**

Can somebody please explain how do I turn decimals into fractions?

**Algebra**

or maybe they are im kinda confuzzled ya know?

**Algebra**

It's the square root of 3 and 9 They're not squared oops

**Algebra**

Which of these numbers is not rational? A. 3 squared B. .25 C. 1/5 D. 9 squared

**Political Science**

In the Unit 4 lecture on elections, you learned about the median voter theorem. Describe the median voter theorem as it was explained in the lecture. Now, think about the political parties and leadership roles you learned about in Unit 5. How do political parties and ...

**Science**

cooling and freezing

**Calculus II**

Find the centroid (x¯,y¯)(x¯,y¯) of the region bounded by: y=5x^2+6x y=0 x=0 x=6 I know the integral (think, at least) is from 0 to 6 and between the first and second equation given, but I missed this lecture and have no idea how to find the center of mass

**calculus**

Find the volume of a solid whose base is bounded by the parabola x=y^2 and the line x=9, having square cross-sections when sliced perpendicular to the x-axis.

**Geography**

I really appreciate you helping everybody Ms.Sue . THANK YOU!!!

**Geography**

Than South Africa

**Geography**

why do you think the ratio of people with HIV/AIDS is lower in Northern Africa?

**Scholarships**

Oh. Okay

**Scholarships**

I am a middle-schooler that is going to skip a year to go straight to high school. I have been looking for scholarships I can apply to now. Do you guys know any good sites?

**Math | Algebra**

aww MAN!!!! No one responding!

**Math | Algebra**

Brand A granola is 25?% nuts and dried fruit and brand B granola is 20?% nuts and dried fruit. How much of sweet item A and sweet item B should be mixed to form a 20-lb batch of sweets that is 23?% nuts and dried? fruit?

**English**

2 & 3 is not use in generic use because it is referring to a certain flower.

**Math | Algebra**

Thank You Ms.Sue

**Math | Algebra**

Is the answer around 18?

**Math | Algebra**

Thank you so much!!

**Math | Algebra**

A Caterer has 8 cups of red candies. How many cups of white candies must she add to the red candies to create a candy mix that is 30% red candies.

**History**

The so-called Equal Rights Amendment has never been ratified. In 1848, a group of abolitionist activists–mostly women, but some men–gathered in Seneca Falls, New York to discuss the problem of women's rights. (They were invited there by the reformers Elizabeth ...

**statistics**

What's the question?

**Chemistry**

4Fe + 3O2 = 2Fe2O3 158g of Fe will react with how many litres of O2 to produce the maximum amount of Fe2O3

**American Government**

b c d a b c d b d c

**English**

The fifth grade class was 3/5 boys. Of those boys, 4/6 had brown hair. What fraction were boys and had brown hair?

**Algebra**

the length of a rectangle is 4 less than 3 times the width if the perimeter is 48 inches find the length and the width

**help azap math**

Well you i could not awnser that question cuz u copied it from a online assesement and it shows no values

**Meteorology**

Warmer temperatures increases the kinetic energy of water molecules which enables them to escape the water surface faster

**social studies { somebody please help me please**

C B D D

**Calculus**

An architect wants to design a window in the shape of a rectangle capped by a semicircle. If the perimeter of the window is constrained to be 24 feet, what dimensions should the architect choose for the window in order to admit the greatest amount of light?

**Algebra**

How do you write the expression that represents the total length of each segment

**Equations and Inequalities Unit Test**

I am going to do the same test right now - I NEED HELP PLEASE!!!

**math**

rewrite each pair of unlike fractions as like fractions

**PreCalculus - Need help, due tonight**

1. Rewrite the expression 1/2ln(x – 6) + 3ln(x +1) as a single logarithm. 2. Rewrite the expression 1/3[ln x – 2ln(1 – x)] as a single logarithm.

**Physics**

A certain diving bell for use in the ocean has a square window measuring 0.250 m on each side. The inside of the bell is pressurized and maintained at a pressure of 2.00 atm. The mass density of seawater is 1025 kg/m3. How deep can this bell be lowered before the vector sum of...

**Algebra**

X=22.5 X=2.5

**Algebra**

A company charges $6 to make an pattern for an order of T-shirts and $11 for each T-shirt it produces from the pattern. The expression $11n+$6 represents the cost of n T-shirts with the same pattern.Find the total cost for 5 T-shirts with the same pattern.

**Chemistry**

4.80 L of N2, at 25 ∘C and 1.22 atm , is mixed with 1.80 L of O2, at 25 ∘C and 0.122 atm , and the mixture allowed to react. N2(g)+O2(g)→2NO(g) How much NO, in grams, is produced?

**Geometry**

prove that if the lengths of two sides of a and b, triangle are a and b respectively, then the lengths of the corresponding altitudes to those sides are in the ratio b/a.

**Science**

What type of water evaporates quicker:well water or salt river water?

**physics**

A 2.6 kg toy locomotive is pulling a 1.7 kg caboose. The frictional force of the track on the caboose is 0.52 N backward along the track. If the train is accelerating forward is 3.1 m/s2, what is the magnitude of the force exerted by the locomotive on the caboose? How would I ...

**chemistry**

2C4H10 + 13O2 ==> 8CO2 + 10H2O

**Physics**

A 20-kg child running at 1.4 m/s jumps onto a playground merry-go-round that has inertia 180 kg and radius 1.6 m. She is moving tangent to the platform when she jumps, and she lands right on the edge. Ignore any friction in the axle about which the platform rotates.

**Math**

back

**Physical**

25

**Physics**

So, vf = final velocity = 5.01m/s vi = initial velocity = 23.5m/s a = acceleration = -2.12m/s^2 d = distance I plugged everything in and got 0.045. Is this the correct way to solve? 5.01^2 = 23.5^2 + 2(-2.12)d 25.1001 = 548.01d d = 25.1001/548.01 Thanks!

**Physics**

Thank you! I was stuck on this problem

**Physics**

A train is traveling south at 23.5 m/s when the brakes are applied. It slows down with a constant rate to a speed of 5.01 m/s in a time of 8.73 s. How far does the train travel during the 8.73 s? I have already found -Acceleration during braking: -2.12m/s

**math**

Find the smallest positive integer n for which 126n cube root is a whole number

**math**

(18.6)-y

**math**

translation for y less than 18 times 6

**math**

15x-12

**math**

yes. thanks

**math**

translation of 12 less than 15 time x

**math**

I got the same answer 100/w

**math**

translation of the quotient of 100 and w

**math**

the product of a number and 35

**Chemistry**

I believe that the answer to 1 is C because, according to the first law of thermodynamics, energy can be converted from one form to another but is neither created nor destroyed. So, the total energy of the universe would remain the same even if the system's energy ...

**Physics**

If it was to be built in real life the difference in height will increase potential energy, the mass will increase, and therefore because it was increased uniformly F=MA acceleration will be constant. so yes.

**math**

So if by LCD you mean Least Common Denominator, I would start off with finding values of 7 8 12 that are the same, so by multiplying 7 and 8 you get 56 which is not a multiple of 12. so we must now find the LCM of 56 and 12 which is 168 found by looking at the progression of ...

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. 1. When it looked like all hope was lost for winning the war, the commander ...

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most museum visitors displayed respect for the artiste's work, ...

**Language Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While being an extra on a movie set may seem fun and exciting, it is ...

**LA**

then what is 1? thanks though

**LA**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most people in Los Angeles will go to a Dodger's game every now ...

**Language Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The fact that the lottery winner flaunted his newly acquired wealth made all...

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The group of friends _________ around the coffee shop long after it was ...

**Languarge Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. When it looked like all hope was lost for winning the war, the commander ...

**Science**

If the volume of a balloon is 5.0 L at 22 degrees Celsius, what will be the new volume if the balloon is heated to 75 degrees Celsius? Should the volume increase or decrease? 5/22=x/75 x=17.045

**math**

A video rental company offers a plan that includes a membership fee of $8 and charges $2 for every DVD borrowed. They also offer a second plan, that costs $14 per month for unlimited DVD rentals. If a customer borrows enough DVDs in a month, the two plans cost the same amount...

**Chemistry AP**

This isn't quite an HW question, I'm needing any site that gives practice Free Response problems for equilibrium for AP Chemistry if there are any for study and practice.

**Algebra 2**

Karl says that you can take the square root of each side of an equation. Therefore, he says that (x + 5)2 + ( y – 7)2 = 36 and ( x + 5) + ( y – 7) = 6 are equivalent equations. Emily says the equations are not equivalent. Who is right? Explain your answer. I know ...

**math**

16

**o level mathematics**

in a class of 35, all the pupils play at least 1 game, volleyball, netball and hockey. volleyball only 10, those who play netball only 5, those who play hockey only 3, if 2 play all 3 games how many altogether play volleyball

**Chemistry Ap**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...

**Chemistry AP**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...

**Chemistry, HELP!**

Mole fractions

**Chemistry, HELP!**

Molybdenum (Mo) is a heavy metal that can have severe health effects on humans and animals. Tailings from a mining operation in Colorado have polluted surface waters used by grazing animals with Mo. Based on the following information determine the concentration of the three Mo...

**Math**

What is the unit rate of ounces. A hint is 48 ounces cost costs 3.00 dollars. I divided 48 by three but and got 16 cents but when I multiply by 48 it doesn't equal 3 dollars

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...

**Chemistry AP**

1.301029996, thanks Bob

**Chemistry AP**

Hey Bob, What is the pH at the point during a titration when 20 mL of 0.200 M HCl has been added to 30 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10−5 for NH3. Answer in units of pH. I've gone about getting the mmol of HCl and NH3, getting ...

**Chemistry AP**

Remember the system I use for online homework does not care about significant digits, it goes out to /at least/ 6 decimal places. And I butchered spelling rearranging.

**Chemistry AP**

Alright, this time, I know I have not mistyped my answer. Find the initial concentration of the weak acid or base in an aqueous solution of hydrazine (NH2NH2) with a pH of 10.16. Kb = 1.70 ×10−6 Answer in M I've tried going from 10^-pH then using that (as my x...

**Chemistry AP**

Once again I was foolish and mistyped an earlier answer, getting 4.02e-4 for my answer. I had not put in the 0 between the 4 and the 2 when submitting.

**Chemistry AP**

Well, I've tried going using 4.3e-7=x^2/0.377 to get to what x equals, I've been getting 0.0069, but it's incorrect.

**Chemistry AP**

Calculate the concentration of H3O + present in 0.377 M H2CO3. Answer in units of mol/L I know the Ka of H2CO3 is 4.3E-7. But I don't know what to do from there. (Or, I'm not getting the correct answer at least)

**SS**

What was the purpose of the Adams-Onis Treaty? Can some help me answer this question?? Ms. Sue??

**Chemistry AP**

The UT (University of Texas) Quest system, Online quizzes, takes it out further for it to count as correct, when I am taking in class tests on paper, yes, it's cut down using significant digits.

**Chemistry AP**

I've figured out my mistake, mentioned above your post, mistypes when inputting answers are a terrible thing :p

**Chemistry AP**

I made a silly mistake and inputted the correct answer of 4.805909915 as 4,805909915, I noticed as I looked at my previous answers, sorry for all of this.

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do...

**Chemistry AP**

Correction. I meant Ka=([H+][Cl-])/[NH4Cl] not Kw

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do.

**Physics**

3.4N

**AP Chemistry**

Calculate the entropy change when 4.88 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ)at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The corresponding free energy of ...

**AP Chemistry**

What is the value of w (work) when 1.3 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal I know ...

**physics**

Calculate the momentum of a 0.1 kg rifle bullet traveling 500 m/s. Answer in units of kg•m/s