# Posts by Maddie

Total # Posts: 368

**Chemistry**

The pH of an 0.0870 M solution of weak acid A is 2.20. The pH of an 0.0830 M solution of weak acid B is 4.07. The pH of an 0.0890 M solution of weak acid C is 5.13. Identify the three acids from among those listed below (the Ka values are listed in Appendix E of your textbook...

**Chemistry**

I'm not really sure how to go about doing this problem... What is the pH of a 7.40 x 10-3 M solution of NH4Cl? Help is appreciated! Thank you

**algebra**

write and inequality describing this region. will an 18 wheeler hold 71 refrig's and 118 tv's or will it hold 51 refig's and 176 tv's?

**Chemistry**

Awesome! Thank you

**Chemistry**

An aqueous antifreeze solution is 31.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.039 g/cm3. Calculate the molality of the ethylene glycol.

**Chemistry**

Thank you :)

**Chemistry**

A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...

**Chemistry**

maybe my homework set online is messed up because it is not taking either of these answers :( sorry. But thank you both for your help!

**Chemistry**

hmmm for some reason this did not work... How did you go about solving this problem? Could any of them be a tie?

**Chemistry**

Rank the following compounds in order of their solubility in water. (most soluble = 1 -- least soluble = 4)--Note that for the same solubility rank the same (a tie). (CH3)2CHOH HOCH2CH(OH)CH2OH CH3CH2OH (CH3)3COH

**Chemistry**

Thank you so much!

**Chemistry**

What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?

**math**

If x = 15 units, y = 7 units, and h = 4 units, then what is the area of the trapezoid

**Algebra**

Find the integers from 1 to 144 which are perfect squares and write the square root of each one.

**Math**

Ten boys are to share 3 3/4 pounds of candy equally. How much candy does each boy get?

**Math**

1). How many shelves each 2 3/4 feet in length can be cut from a piece of lumber that is 15 2/3 feet long?

**Chemistry**

What mass of CH4 is contained in a 443 mL sample of CH4 at −32◦C and 282 torr? Answer in units of g. I tried so many times and I don't get it!

**Stats Repost**

0.057

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y

**math**

a ship sail S 40 degrees W four 4 hours how do i figure out this question

**math**

A ship sail S 40 degrees W for 4 hours at 30 kph. make a scale drawing

**Physics A**

how much work is being done a bookshelf being pulled 5 meters at an angle of 37 degrees from the horizontal? The magnitude of the component of the force that does the work is 43 Newtons

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

**Algebra**

write the standard form of the equations: through (1,3) and (-4, -4) through (5,4) and parallel to y=4

**Algebra**

write the following in standard form: slope= 2/3 y- intercept= 3

**5th grade word problems**

5 3 -- * -- 100 x 5x=300 x=60 1. put 5 over 100, oranges over oranges. And 3 over X. glasses over glasses 2. cross multiply, 5*x and 100*3 3. divide both sides of the equation by 5 to get x by it's self. 4. X=60, you can make 60 glasses with 100 oranges

**math**

98*3=294 294\3=98 294+98=392 392*2=784 784 Feet

**Science**

oh I get it now, thank you

**Science**

um sorry but Ms.Sue it's not supposed to be the separate functions but how it all ties together

**Science**

I have this last question left and I'm stuck!!! Explain how cell organelles are similar to a factory. Must be 1/2 a page.

**geography**

We are not geeks. WE are smart individuals.

**math**

Grapes cost $2 per pound. How much does the given amount cost? 0.25 pounds.

**math**

There are a total of eight possible outcomes for three coins: HHH, HHT, HTH, THH, TTH, THT! HTT, TTT. Out of these eight outcomes, seven of these show at least one tail (all except HHH). After counting, we find that six of these seven outcomes have at least one head, so the ...

**Math**

Factor the polynomial completely. 6x^3 + 36x^2 - 240x

**Science**

The sun emits billions of watts of light,heat,and energy ever second. How much of this light,heat, and energy does the Earth benefit from?

**calculus**

FInd the area of the region bounded by the graphs of y= 3x^2+1 , y=0, x=-2.7, x=2.5

**8th grade math**

what does the problem look like?

**math**

12+ 2n=60 48= 2n 24= n :)

**Math**

(n-14)/ 12 = 248 n-14= 2976 n= 2990

**math**

make sure the ratio of the dimensions stays the same. say if you had a 3 x 4 picture you could change the dimensions to 6 x 8 and because they are the same ratio the image should not be distorted.

**Physical Education**

I have the ability to watch it, I'm just not allowed to because we have a bandwith limit.

**Physical Education**

That's the thing, the program doesn't /have/ an online teacher.

**Physical Education**

1. Aerobic activities can be done for an extended period of time and supply oxygen to your muscles. Such activities help develop _______________________. 2. You can change your _______________________ by exercising regularly and eating healthfully. 3. The ...

**Pre Calc**

A plumber charges $40 per hour for labor with a minimum labor charge of $30. For example, if she does her repairs in only 0.2 hours, then $40*0.2=$8, which is less than the minimum, so she would charge $30 for labor. We will assume she can repair any problem in one day – ...

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?

**Mixed numbers and improper fractions**

125/12

**Math**

Does anyone know the answer to the math riddle "Did you hear about..." the answer is 12 words and it's pg 167.

**chemistry**

A reaction occurs where the concentration of reactant A changes from 0.74 moles/liter to 0.63 moles/liter in 20 seconds. what is the average rate of reaction?

**social studies.**

15. What was a result of WWII on women’s rights in the US? A.Women were greatly oppressed and suffered setbacks B.Women lost the vote during wartime C.Opportunities for women increased D. None of the Above I believe its C ? 16. What happened with most of the working women...

**geometry**

solve this proof: PR is congruent to DE, PT is congruent to DF, Angle R is congruent to Angle E, Angle T is congruent to Angle F.. Prove Triangle PRT is congruent to Triangle DEF

**chemistry (please help)**

A 2.8-L engine in a vehicle with air-conditioning uses 26.5-L of coolant. If the coolant has a density of 1.11 g/ml, what mass does the coolant add to the vehicle?

**geometry**

If the length of a rectangle is twice its width, w, write an expression to represent the perimeter of the rectangle. If the perimeter of the rectangle is 72 inches, what is the length and width of the rectangle?

**Algebra**

What is 3y^2-27? Explain please.

**Math-geometry**

Do it yourself.

**math**

1. Consider the function f(x) = x3 + 7x2 + 2x - 40 . a. Find the possible rational roots of f(x) = 0. b. Use synthetic division to divide f(x) by x - 2. Show all your work. Use your answer to explain whether or not x – 2 is a factor of f(x). c. Factor f(x) completely. ...

**global history**

It's C

**chemistry**

what sample size of .9181M vinegar would require 27.50 mL of .5185M of NaOH for neutralization?

**science**

what is the dencity of an object that has a mass of 92 grams and a volume of 40 milliliters? ~thx!

**math**

7x^2-20x=3

**Third Grade Math**

i think 1 gram but i need someone elses opinon....

**Third Grade Math**

I need a small button...

**Third Grade Math**

About how much does a button weigh? 1 gram 100 grams 1 kilogram 10 kilograms Thanks!

**math**

If there are 7:5 boys and girls in a class and there are 21 girls how many boy are there in the class?

**Chemistry**

I need help predicting the products and naming them using classes and subclasses. a. Br2+BaI2 b. CdBr2+Na2S c. H2+Br2 d. H3PO4+Ca(OH)2 (Numbers above are supposed to be in subscript form)

**calculus**

rotate the axes and eliminate the xy term of 3(x^2)+2xy+3(y^2)-8

**calculus**

rotate the axes and eliminate the xy term of 3(x^2)+2xy+3(y^2)-8

**physics**

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?

**physics**

A hallway display of energy is constructed in which several people pull on a rope that lifts a block 1.15 m. The display indicates that 1.05 J of work is done. What is the mass of the block?

**Chemistry**

If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the value of the reaction quotient and will a precipitate form? I keep getting 0.0011 because I thought the answer was [Ca+][OH-] but that's not correct, I think I'm missing a final step

**Chemistry**

Sorry I meant Ca+ not Cu (typo) and Q value as is quotient reaction value. Q = K at equilibrium, it measures if a precipitate will form

**Chemistry**

One other question that I cannot figure out what I'm doing wrong is this.. If .002 L of .650 M NaOH are added to 1.0 L of 0.9 M CaCl2 what is the Q value? I keep getting 0.0011 because I thought the answer was [Cu+][OH-] but that's not correct

**Chemistry**

Got it, thank you!

**Chemistry**

How many grams of BaSO4 can dissolve in 1.5 L of a 0.010 M solution of Na2SO4? Ksp= 1.1 x 10^-10 I thought the answer was 1.1x10^-8 M then multiply by the molar mass to get the amount of grams but my answer isn't correct. PLEASE HELP!

**physics**

Sphere A: Is Rubber it is an insulator, and that means the electrons are all in there one space. That's the dark spots you were talking about. Sphere B: Is Copper and it is a conductor; the electrons are all over the sphere. As is the opposite to the sphere A. And this ...

**Pre-Cal**

120 pi radians

**pscyhology**

lmao what. ^

**Language**

we are reading a book called the children of wilesden lane and i don't have the book so i don't know what "the last paragraph of chapter three" is PLEASE HELP!!!!

**Physics Flux**

Flux = E*A E = Flux/A E = Flux/(0.1^2*cos(20)) = 1596.2667 N/c

**6th grade science acrostic**

Can u please HELP me !!!!!! I need to do a acrostic poem about safety and it's due tomorrow plz help me

**poetry**

i need help on thinking of a acrostic poem for DOLPHIN.

**poetry**

i need help on making a TROCHAIC poem for a project. i really need help

**math**

it will take 8 days for the snail to reach the top. 5-3+5-3+5-3+5-3+5-3+5-3+5-3+5-3= 16

**poetry**

oh it's okay. thank you :)

**poetry**

i need some examples of a: metaphor, personification, and trochee. help please

**poerty**

i need some examples of a metaphor, personification, and trochee. help please

**math**

so 3*7=23+1=24 24 over3 = 8?

**math**

i need help to find out 7 1/3 (seven and one third) is in a decimal? please help me.

**Math**

What is the product of 3y2 and 4y5?

**math**

Sam has a savings account that increased in value over a twelve month period from $8765.00 to $9006.06. He made no deposits or withdrwals in that time. What percent interest did he receive for the 12 month period?

**government**

My teacher told me and my class to write a essay on why we would want to live in a capitalist government but I have no idea what to write can you help?

**math**

about 39

**9th grade**

how do i solve 3y-4+3x-5x+2 and solve for x and y

**chemistry**

Why does the total energy (Ke+Pe) decrease with height?

**social studies**

What is the social triangle of the woodland cree?

**math**

Thomas and Samantha work on weekends and holidays doing odd jobs around the neighborhood. they are each paid by the day, not the hour. they each earn the sme whole number of dollars per day. last month thomas earned $ 184 and samantha earned $ 207. how many days did each ...