# Posts by Hannah

Total # Posts: 3,341

**chem-repost**

How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off

**9th grade polynomials**

area= lX w so by substituting the numbers and variables for the lenght and using x for the width we get area= (2+3x) X x

**chem**

How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off

**Economics**

so how is that trying to reduce the poverty trap and how is not?

**Economics**

Ok sorry about that. So far I have that is the minimum wage is increased then those who get benefits will nnot receive them anymore as they are having higher incomes. I also said that increasing the minimum wage will reduce the poverty trap because it gives employees an ...

**Economics**

Discuss whether the minimum wage will reduce the poverty trap? I need 3 ways for and 3 ways against

**chem**

A balloon holds 29.3 kg of helium. What is the volume of the balloon if the final pressure is 1.2 atm and the temperature is 22°C? using the equation pv=nrt would i put 29.3 kg in place of n? but n has to be in moles so how do you convert that? thanks

**chem**

nvm i got it

**chem**

An experiment shows that a 114 mL gas sample has a mass of 0.167 g at a pressure of 721 mm Hg and a temperature of 32°C. What is the molar mass of the gas? so im suppose to find the molar mass but i thought that was the same as the g just converting it..? im using the ...

**Chemistry**

How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?

**Math**

The cost of Mrs.Taylors purchases was $45.87 She had a coupon for 20% off the total. Find, to the nearest cent, the amount of money she will save if she uses the coupon?

**Math**

The cost of Mrs.Taylors purchases was $45.87 She had a coupon for 20% off the total. Find, to the nearest cent, the amount of money she will save if she uses the coupon?

**physics for dummies!**

The man hanging upside down is holding a partner who weighs 699 N. Assume that the partner moves on a circle that has a radius of 3.37 m. At a swinging speed of 3.49 m/s, what force must the man apply to his partner in the straight-down position?

**physics cars!**

Car A uses tires for which the coefficient of static friction is 0.175 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 28.3 m/s. Car B uses tires for which the coefficient of static friction is 0.740 on the same curve. The cars of...

**physics help go!**

Two cars are traveling at the same speed of 27 m/s on a curve that has a radius of 126 m. Car A has a mass of 1020 kg, and car B has a mass of 1670 kg. Find (a) the magnitude of the centripetal acceleration and (b) the magnitude of the centripetal force for Car A, (c) the ...

**Ch. 5 physics help!**

There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet ...

**physics please help! 116**

Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412 N, and the other has a weight of 908 N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the ...

**physics help please!**

A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...

**physics 2 help please!**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generates only a weak thrust, but it can do so over long periods of time with the ...

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...

**Algebra**

A roadside vegetable stand sells pumpkins for $5 each and squash for $3 each. One day they sold six more squash then pumpkins and their sales totaled $98.00. Write a system of equations to find the number of pumpkins and squash they sold.

**chem**

i need help on this question: Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. a) There are more molecules of N2 are present than atoms of Ar. true or false...

**World Geography**

What are three ways geography influenced Roman History?

**math**

if csc theta= -5/3 and theta has its terminal side in quadrant III, find the exact value of tan 2 theta.

**English**

for "Children of the River" I have to come up with a thesis statement for chapter 1 I don't know what it is.....please help

**Algebra 1**

What property justifies that 3y+9 = 9+3y

**Math(Please check)**

What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by p(x)= 3x^2 - 5x + 2 First I plugged 5 into the equation and got 52. Then I ...

**Math(Please check)**

Find the slope of the graph at y=sqrt 2x^2 +1 at the point (2,3). First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?

**Math**

Find the derivative of f(x)= 2 sqrt x at x=4. i thought that the derivative would be 2 x^1/2 but I guess this is wrong.

**Math**

Calculate the limit limit x->infinity 2x^2 + 100 / x^2 +1 I am not sure how to do this.

**Math**

Find the slope of the curve at y=x^6 at x=-3. I know that to find the slope you do y2 - y1 / x2 - x1 but I do not know what to do here.

**Math(Please check)**

So if though it says that the rate at which the epidemic is spreading is 110 per day that is not rate of change correct?

**Math(Please check)**

During the month of February, a flu epidemic hit the University. The number of people sick at time t (measured in days) is given by the function P(t). The rate at which the epidemic is spreading on February 3 is 110 people per day. How is the information best represented ...

**Math(Please check)**

I had the negative sign there because thatg was one of the answer choices that best fit what I had but there is no negative correct? Its positive?

**Math(Please check)**

Find the derivative of f(x)=1/3 sqrt x. The 3 is little above the square root. I know that it is -1/3x^-4/3. Can this be written as -1/3x^4/3 ?

**Math(Please check)**

Another answer choice was y=-2076x + 15,780. Is this correct? If it is I do not understand how they go -2076. Thank you for your help!

**Math(Please check)**

The value of an automobile was $15,780 in 1994 and depreciated to $5400 in 1999. Let y be the value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation in slope-intercept form that models the value y of the automobile, x years after 1994. ...

**Math(Please check)**

Thank You

**Math(Please check)**

Find the derivative of f(x)=7x-19 at x=2. I think that the derivative would be 7 and theb times 2 so 14. Is this correct or would it just be 7.

**chem**

I know carbon is tetrahedral but i don't know oxygen

**chem**

I don't get how to the structure and how to find oxygen separetley

**chem**

Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to right.) CH3OH (skeletal ...

**What do taxes pay for**

RACEMIDE

**Help**

Thanks, it didn't look right that's why I reposted

**Help**

I get x=3 can you let me know if I have it right

**Help**

Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no ...

**Math**

Is is x=1/3

**Math**

Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no solution, answer as "No solution."

**Health**

thanks, do you have any other suggestions?

**Health**

I need an example of a health fraud item/ product. I need to find one product that has health fraud and that I can write 150 words about. I tried searching on google but cant find anything/ don't know what to search. do you know of any products? thanks

**History**

Describe an advantage of havinf federal judges appointed rather then elected

**History**

Why is it important to learn about the government?

**History**

What problems might arise from making the runner-up in the presidential election the vice president?

**math**

I have no idea... :)

**chem**

thanks:)

**chem**

For each of the following sets of atoms and ions, arrange the members in order of increasing size. Mg2+ F- and Na+

**algebra**

whats the lcd of 8/9x+2/3x=1/9x+45

**science**

can you unscrample this word? its in french. "ratuere"

**5th grade algebra**

Omg thanks so much!!!

**5th grade algebra**

I need help with input out put table. The top row is: 1, 4, 3 5 8 9 6 The bot row is: 1, 10,7,13 ? ? ? The question marks are blanks in the table. Hellllllp please

**Math**

I am looking for help integrating using u substitution over the interval of 0 to pi/2 the function cos(2x/3)

**Math**

Solve integration using u substitution of (x+1)sqrt(2-x)dx

**Math**

Solve integration using u substitution of (x+1)sqrt(2-x)dx

**Physics**

d^2=(k*Q1*Q2)/F d^2=(8.99*10^9)(60*10^-6uC)(50*10^-6uC)/175 d^2=0.154 square root of d^2= square root of 0.154 d=0.392m or 3.92cm

**chem**

oh i got it:) thanks:):)

**chem**

i tried [Kr]5s24d8 but it didn't work

**chem**

Use the periodic table to write electron configurations for each of the following elements. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.) 1. Pd thanks

**chemistry**

How many grams of oxygen gas are reacted if 75 g of hydrogen gas is consumed?

**science**

How does a tennis ball change shape when you hit it?

**Physics**

Consider the 676 N weight held by two cables shown below. The left-hand cable had tension 740 N and makes an angle of θ with the wall. The right-hand cable had tension 730 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the righthand ...

**chem**

What is the frequency of radiation whose wavelength is 26.80 Angstrum ? at first i got 1.000e17 and it was wrong. now i only have 1 more try. i tried it again and got 9.993e16 but i don't want to put it in unless its correct. can you guys check my work?

**Calculus**

Find dy/dx, y= -7e^6x+11 + xe^x

**science**

what properties of carbon explain its ability to form many macromolecules?

**physics**

A car moving at 20m/s is sounding its horn as it approaches you. If the actual frequency of the horn is 283 Hz, what frequency will you hear at 25.0 degrees C?

**Thermochemistry**

How many grams of water at 0 degrees C can be frozen into ice at 0 degrees C if 55.0 kJ of heat is removed? delta Hsolid= -6.01 kJ/mol

**Thermochemistry**

3CO(g)+ Fe2O3(s) --> 2Fe(s) + 3CO2(g) + 24.7 kJ. How much heat is released when 56 grams of CO react?

**Chemistry**

The molar heat of solution of NH4NO3 is 25.7 kJ/mol. How much heat (in kJ) would be required to dissolve 20 grams of NH4NO3 in water?

**Chemistry**

How much heat is required to convert 9 grams of water at 100 degrees C into steam at 100 degrees C. Hvap for water = 40.7 kJ/mol

**Chemistry**

Si(s)+ 2Cl2(g) --> SiCl2(g) --> SiCl2(l) + 687 kJ. How much heat is produced when 106 grams of Cl2 react?

**Chemistry**

A student mixes two water solutions with an initial temperature of 25 degrees C to form a final substance with a mass of 65 grams at 30 degrees C. What is the heat change in kJ?

**Chemistry**

How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?

**Chemistry**

How many calories are required to raise the temperature of 75 grams of water from 20 degrees C to 50 degrees C?

**question about corrections(what they mean)**

ok thanks:)

**question about corrections(what they mean)**

ok. so this may be hard to explain and may not be enough info that you understand but ill try. I did a paper and my teacher corrected it and said changes i need to make. here is a clip from the paper of something that she commented on: " Here are some examples. Hard Tack ...

**english- need a creative title!**

thanks for the idea. That would probably work but I don't know if my teacher would understand it because that is not one of the slang words i described in my paper. do you have any other ideas?

**english- need a creative title!**

For my english class i had to right a paper on civil war slang and how this topic releated to the book The Red Badge of Courage. I finished my paper but have no idea of a creative title. Im not good at thinking up good titles :/ have any ideas?

**Algebra**

why is any real number a solution for the equation 8y - 30 = 4(2y - 7.5)

**chem**

i don't think 34 is correct because that is way more than 10% of my first answer of 5.7

**chem**

Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2 H2O(l) + 2 CO2(g) ...

**Math**

A population is 200 in the year 1825, 252 in 1850, and 318 in 1875. What is the p(t) equation? I see that the population increases 26% over each 25-year period but I can't figure out the equation.

**Math**

Dina earned 1/4 for baby sitting and 1/2 for washing the dishes. How much money did she NOT earn from $25.00?

**Geometry**

sam..? im assuming just like the others we cannot see your documents so we don't know what the picture looks like. sorry

**chem**

thanks for the help: can you help me with another one? Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s...

**chem**

thanks so its 5.21 L h2?

**chem**

2Al(s) + 2NaOH(aq) + 2H2O(l) 2NaAlO2(aq) + 3H2(g) (unbalanced) sorry i forgot. it was unbalanced but then i balance it

**chem**

Calculate the number of liters of hydrogen, measured at STP, that can be produced from the reaction of 0.155 mol of aluminum according to the following unbalanced chemical reaction equation. i got .193 L of H2 but it was wrong. i only have one submition left!

**Geometry Please Help**

im sorry your link/document doesnt work

**chem- plz check my work**

2. Given the following equation, C2H5OH(l) + 3 O2(g)---> 2 CO2(g) + 3 H2O(l) How many liter of CO2 are expected in the combustion of 12.0 grams of ethanol? My work: 12.0g C2H5OH X 1 mol C2H5OH/46.08g C2H5OH X 2 mol CO2/1 molC2H5OH X 22.4L CO2/1 mol CO2 = 11.7 L CO2 all i ...

**chemisty**

when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it has not occured thanks:):) <3