Friday
April 18, 2014

Posts by Zoe


Total # Posts: 164

Chemistry
Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent? Thank you!!!

Chemistry
How can you tell that CO2 has a dipole moment while O2, N2, and HCL does not?

Chemistry
Could you please explain how electronegativity works and how you find the total electronegativity value of PO3 K2O H2S GIVEN: P- 2.1, O-3.5, K- 0.8, H- 2.1, and S- 2.5 Also how to you tell if the compound is ionic, polar covalent, or non polar covalent? Thank you!!!

math
96 diveded by 3

math trig
If a ferris wheel with a 20.5 meter radius, how high would one car be from the loding dock at these given angles trveled by the rider?: 90 135 180 225 270 315 405 450 495 and 540?

math trig
If a ferris wheel has a radius of 20.5meters, how tall would a 45 degree angle be?

Math-Calculus
Consider two ships which are joined by a cable attached to each ship at the water line. Suppose the two ships are 200 metres apart, with the cable stretched tight and attached to a pulley which is anchored halfway between the ships at a depth of 45 metres. If one ship moves aw...

Physics
A 4.10 m long, 590 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the point where the b...

math
The perimeter of a rectangular playground is 40 yards. It is 1.5 yards longer that it is wide. What is area of playground?

math
The perimeter of a rectangular playground is 40 yards. It is 1.5 yards longer that it is wide. What is area of playground?

Geography
The G8 countries are responsible for 62% of the carbon dioxide emission into the earths atmosphere. Should I classify this as worrying or human changes

Algebra
I just guessed and checked for this one, but the answer is Karen will be 18, and Susan will be 27.

science (revision)
I have a test on electricity on Friday and I wandering if I could get a basic summary of what I should know. I'm British so I don know what grade I am but I'm 11 so aound that sort of basic level please!!! Thanks.

Math
A cup of coffee costs 80c less than a burger.Together they cost 220c. Use this information to form an equation and solve it. This question I can't get my head around. It's due in 2 days but I would like to get it done sooner. Thanks.

physics
A large water tank is 18m above the ground. Suppose a pipe with a diameter of 8cm is connected to the tank and leads down to the ground. How fast does the water rush of the piper at ground level? Assume that the tank is open to the atmosphere.

Math
Jen and Heather went to lunch. When the bill came, Jen discovered that she only had $8. Luckily, Heather had enough money to pay the other part, 3/5 of the bill. How much did Heather pay? How much was the total bill? I'm having a hard time understanding the steps in gettin...

physics
wave speed: the violin is a four stringed instrument tuned so that the ratio of the frequencies of adjacent strings is 3:2. (This is the ratio when taken as high frequency to lower frequency.) If the diameter of E string (the highest frequency) on a violin is 0.25 mm, find the...

physics (SOS!)
a cylinder that is 20 cm tall is filled with water. If a hole is made in the side of the cylinder, 5cm below the top level, how far from the base of the cylinder will the stream land? Assume that the cylinder is large enough so that the level of the water in the cylinder does ...

physics
A block of wood will sink 10 cm in freshwater. How far will it sink in seawater. The specific gravity of seawater is 1.025. I'm confused as to how to approach to problem

physics
why is work done during the rise= mgh directly?

physics
(a) a spherically shaped buoy is made from wood, which has a specific gravity of 0.6. find the acceleration of the buoy when released from rest at the bottom of a freshwater lake. (b) if the buoy starts out 10 m below the surface of the water, determine the height above the wa...

chemistry
If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?

chemistry
A sample of natural gas is 85.2% methane, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this gas mixture at 18.0°C and 771 mmHg? Assume ideal gas behavior.

math
E4EW45WE45W4

mathematics of finance
solve; FV=7,000;i=0.03;PMT=$400;n=?

algebra
what is the answer of 7h+2w-9h-8w

social studies
ethnic group

chem
.144

Math
A student wants to display the average monthly temperatre for one year.He chooses a line graph to display the data.Describe and correct the error made in choosing that type of display for the data.

Math
Which sample is more likely to be biased? Should big bend state park restrict the number of campers allowed on the grounds? a.70 randomly selected visitors to Big Bend State Park b.70 randomly selected campers at Yosemite National Park

Math
Should the city build a homeless shelter downtown?Which sample is more likely to be biased? a.60 randomly selected downtown resturant customers b.60 randomly selected people at the post office

Math-Corrections
I'm not sure ,but now i got the answer no because she(the librarian)cant prove that the kids will not like the new encyclopedia.

Math-Corrections
Based on the survey,the librarian predicts that about two-thirds of the students in seventh grade will not like the new encyclopedia.Is this answer reasonable? Answer i got:yes

meanings
Musical?

Chemistry
What is the complete chemical equation? Al(s) + Cu(CH3COO)2(aq) -> ?

Math help quickly
Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above and i = 0 on the bottom...

Calculus need help badllyyy!
Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above and i = 0 on the bottom...

4th grade math
what is 5/6 of 288

4th grade math
what is 5/6 of 288

Chemistry
What is the magnitude of the energy change associated with the emission of one mole of photons of light* with this wavelength? light*= 6.231×1014 Hz

MATH
2+2+1+1=6cm2

Chemistry
Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 10-4 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 10-3 M/atm

Chemistry
Find the product for the equation and then write a balanced equation. Cl2 + FeBr3 -> ?

chemistry
I need to convert a word problem that I was given into a balanced chemical equation and cannot figure out how i was type it. The problem is: Nitrogen and hydrogen gases react at extreme temperatures and pressures. Any help?

math
Puck is making a scale model of an airplane. The actual airplane is 98 feet long. The scale of the model is 1 cm : 4.7 ft. What is the length of the model? [Round to the nearest hundredth, if necessary.]

Chemistry
In respect to covalent bonding, what does it mean if there's an unshared or lone pair of electrons?

Science
A circular hatch in the hull of a submarine has a radius of 40.0 cm. The submarine is 850.0 m under water. If atmospheric pressure above the ocean is 1.01 x 105 Pa and the air pressure inside the submarine is 1.31x 105 Pa, what net force is exerted on the hatch? (ρsw = 10...

chemistry
A gaseous mixture containing 5 moles of H2 and 7 moles of Br2 reacts to form HBr. Write a balanced chemical equation. Which reactant is limiting? What is the theoretical yield in moles? What is the theoretical yield for this reaction in grams? How many moles of excess reactant...

calculus
i'm not sure how to do this. can someone help, please? thanks! consider the function f(x0 = x^2 + 2x on the interval [-2, 2] a. draw a sketch of the graph of f(x). find the average rate of change on the interval [-2, 2] and sketch this secant line. b. find an expression th...

English
essay "peace and stability in a globalized world" I need some help. Thanks

Math
Typing error fing meaning find

Math
How do I fing volume of a shape?

calculus
let f(t) = 2*pi*t + sin(2*pi*t) a) find value of t in open interval (0,2) for which the tangent line at (t, f(t)) is parallel to the line through (0,0( and (2, 4pi) b) suppose the given funtion describes the position of a particle on the x-axis for 0<= t <= 2. What is th...

calculus
find the centroid of the plane region bounded by the curves y = cos x, y=sinx, x=0,

English
I need to know what just means in the following Sentance . Do you think this is just Please help even my mom is blank Tx

English
I'm blank on this question From the verbs listed write a noun ending in ion Divide Explode. Collide Confess. Invade. Rotate Comprehend. Deflect I don't need all the answers I just need to know what it means Thanks

Non verbal reasoning age 9-10
I really hate nvr it's horrible. I'm English so we have to do this I don't know if any Americans do it but I still hate it. For anyone who docent know what it is, it's basically pictures that mean something , but get changed ur ment to circle the answer . Any a...

Fourth grade math
Tx fo helping

Fourth grade math
What's range mean?

English
For our homework we had to draw and label an imaginary creature, then write an essay on it . I'm completely stuck on the essay bit please he

English
What word is wrong in this sentence ? Darren wusai and I is a good team. Please help I need this in in about six hours time!

English
Wow ! I thought it wasn't that simple as of being an opposite thanks I'm saved!

English
Really stuck on English homework.ahhhh! What is an antonym for the following words? Subtract Extend Spectator Least Confident Exterior Please, help despretly needed by Monday !

english
I'm not sue but I would put who because it's a simpler word

English check my answer
I'd just say I'm really bad at grammar and tell your teacher , can I have some extra help please? Sweet talking into thinking you love English always works

Social Studes
Hhhhhheeeeeellllllppppppppp mmmmmmeeeeeee oooooooonnnnnnn this

Math
I am a number with the same number of tens as ones. The sum of my digits is less than 5. Is am a number greater than 15. What number am i?

4th grade Math Help
hi, what is the least possible number, when rounded will become 1,000,000? would it be 999,999?

calculus
fin derivative of the function (t+e^t)(4- sqrt t)

calculus
differentiate the following funcation: R(t) = (t + e^t)(4- sqrt (t))

calculus
f(x)= (4x^2+5)/(3-2x) find derivative using limit

calculus
given the function f(x) = { x^2+2 if X<=2, 3 if x=2 and 4-x if x>= 2 -> graph f(x)

math
how do you do 16n-9 with the specials

Physics
A projectile is launched beneath the straight line path it would follow if there was no gravity. How many metres does it fall below the line if it has been travelling for 1 second? 2 seconds?

Calculus
Write the logarithm of a single quantity: 2ln(x)+ln(4)-(1/2)ln(9)

math (plz help)
1. 46 seats...... 30+4+4+4+4 2. No the 8th row has 62 seats and the 7th row has 58 (30+4+4+4+4+4+4+4+4) 3.THeater B has 145 seats.... (40+25 4's) hope that helped

chemistry.
i've tried to di it. 1)Na2CO3 + HCl---> NaCl+NaHCO3 2)Basic as Na2CO3 is a base and amount of HCl =0 3)NaHCO3+HCl--->NaCl+CO2+H2O 4)phenolphthalein for eq pint point 1 as it will indicate change in basicity and methyl orange for secong equivalnce point as it will ind...

chemistry.
in the titration between Na2CO3 and HCl... 1) at the first end point what reaction is stoiciometrically complete? 2)At the start of titration where HCl=0 is the solution acidic or basic. ExPlain? 3) At the 2nd end point what reaction is stiociometrically complete? 4)Propose a ...

chemistry urgent
Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile

Organic chemistry
Draw major product of substitution reaction of (2R,3S)2-bromo-3-methylpentane with CH3CH2O- nucleophile?

science
anyone gonna help?

science
I'm in 5th grade and I need a cool, unusual science fair project. I have 3 days to do this. It has to be a question with a variable, not a demonstration. HELP!

banyan elementary
7x12=84

space
How many socks would it take to fill the space shuttle

biology
21% of a population is homozygous dominant, 49% are heterozygous and 29% are homozygous recessive. if the Hardy-Weinberg Law applies, what percentage of the next generation is predicted to be homozygous recessive?

math
How do you find the unit rate for this? The managerof Quality Dairy stores says it takes 1000 pounds of milk to make 100 pounds of cheddar cheese. Find a unit rate relating pounds of milk (m) to pounds of cheese (c). 1000 pounds of milk per 100 pounds of cheese.

math
find the values of x and y that solve the system of equations -3 x- 8y=19 4x+9y=-22

physics
crate weighs 823 N rests on plank that makes a 25 degree angle with the ground. Find components of crate's weight parallel and perpendicular to the plank

Math
1. -3/4*-(1 5/6)*(-7/4)= 2. -3/4*(-1 5/6)*7/4= 3. -3/4*(-1 5/6)*(-7/4)*(-2 3/8)= 4. 3/4*(- 5/6)*7/4*(-2 3/8)= 5. 3/4*1 5/6*7/4*(-2 3/8)=

Math
Info Sean is buying a new DVD player for 315. the store offers him an interest-free payment plan that allows him to pay in monthly installments of $25. Ques. Use n to stand for number of payments and a for the amount still owed. Write an equation for calculating a for any valu...

Human services
what are the pros and cons of placing children of color in a causian home?

chemistry
consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?

Economics
Quality Adjusted Life Years evaluates interventions in _____ rather than _____. a. dollars; years b. utility; dollars c. years; dollars d. dollars; utility

Chemistry
Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

Chemistry
Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

Chemistry
oh i think you have to convert the mm Hg to atm first

Chemistry
dont you just multiply .038 times the total pressure?

Chemistry
okay yeah i got it. thanks its 736 mmhg

Chemistry
how do i know the water vapor pressure at 25C though?

Chemistry
The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 C and a total pressure of 760 torr . what is the partial pressure of the gas?

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