Sunday
May 24, 2015

Posts by Julia


Total # Posts: 526

math
6:4
December 7, 2010

11th grade
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.17 x 10^6 m/s. find the central force acting on the electron as it revolves in a circular orbit of radius 5.42 x 10^-11m.
December 5, 2010

Chemistry College
One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M HCl? A...
December 2, 2010

chemistry
The answer doesn't fit with the choices given.
December 2, 2010

college
I believe it's suppose to be Pi/4 radians
November 30, 2010

chem/some1 check my work plz.
thank you for all your help Drbob222...just whish me luck for tomorrow in my test... :)
November 16, 2010

chem/some1 check my work plz.
air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag...
November 16, 2010

chem/some1 check my work plz.
nitrogen gas contained in a cylinder with a volume of 5.0x10^2 mL @ a temp of 30C and pressure of 710 torr. The gas is then compresse to a volume of 25mL and the temp. is reaised to 820C. what is the new pressure of the nitrogen gas?? Pf=p1*v1*t1/Tf*Vf P=(700torr)(5.02x10^2mL...
November 16, 2010

chem/some1 check my work plz.
air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag ...
November 16, 2010

chem/some1 check my work plz.
Thank u!!!!
November 16, 2010

chem/some1 check my work plz.
2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the % yield of nitrogn gas?? please check if is ...
November 16, 2010

chem
thank u so much...
November 15, 2010

chem
An ideal gas in contained in a cylinder with a volume of 5.0x102mL at a temperature of 30C and a pressure of 710 torr. The gas is then compressed to a volume of 25mL, and the temperature is raised to 820C. What is the new pressure of the gas?
November 15, 2010

chem
ok..I see what i did wrong...thank u..ur the best!!!
November 15, 2010

chem
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 15, 2010

chem/DrBob22
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 15, 2010

chem
consider the following balance chemical equation: 2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the...
November 14, 2010

thank u DrBoob22
omg...I was wondering where u...I'm studying for a test for weds and I'm so lost with most of this...thank u for your help...
November 14, 2010

chem
when an aqueous solution BaCl2 is mixied with an aqueois solution of Na2CO3, solid barium carbonate precipitates out of solution. write molecular equation, complete ionic equattionand net equation. is this the right formula?? BaCl2(aq)+Na2CO3(s)=BaCO3(s)????
November 14, 2010

chem
well it saids: A 1.50L rubber balloon is filled with carbon dioxide gas at a temperature of 0.00C and a pressure of 1.00 atm. the density of the carbon dioxide gas under these conditions is 1.98g/L. a)at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide ...
November 14, 2010

chem/bobpursley
but i get 502.o and the answer in the back of my book said 2mL....so..
November 14, 2010

chem
well it saids: A 1.50L rubber balloon is filled with carbon dioxide gas at a temperature of 0.00C and a pressure of 1.00 atm. the density of the carbon dioxide gas under these conditions is 1.98g/L. a)at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide ...
November 14, 2010

chem
at 50.0C the balloon ha a vlomue of 1.78L. Calculate the carbon dioxide density at this temperature.
November 14, 2010

chem
Liquid water has a density of 1.00g/mL at 10.0C and .996g/mL at 30.0C. Calculate the change in volume that occurs when 500mL of water is heated from 10.0C to 30.0C.
November 14, 2010

Thank you Dr.Bob222
Thank you, you don't know how much you have help me with my chem class...thank you so much..your the best!!
November 11, 2010

Thank you Dr.Bob222
Thank you, you don't know how much you have help me with my chem class...thank you so much..your the best!!
November 10, 2010

chem
for a combination reaction, it was calculated that 7.59g of A would exactly react with 4.88g of B. these amounts were reacted, and 9.04g of product was isolated. what was the percentage yield of reaction??
November 10, 2010

chem
supose 1.25 mol of N2 and 50.0g of O2 are moxied together. a)which one is the limiting reactant? b) what is the maximum mass in grams of NO2 that can be produced from the mixture? N2(g) + 2O2(g)=2NO2(g) ***please just show me how to set up the equations I would work the ...
November 9, 2010

chem
AgNO3+NaOH-->AgOH+NaNO3 give me molecular , total ionic and net ionic???"
November 9, 2010

chem
suppose you had an unknown solution that contained either dissolved NaOH, NaCl< or NaNO3. you add 4 drops of AgNO3 solution to 4drops of the unknown solution and observed that no solid formed. What can be concluded the unknown solution? why?
November 9, 2010

chem
in the following total ionic equation, which ions are spectator ions? Cu2+ (aq) + 2NO3-(aq)+2Na+(aq)+S2-(aq)--->CuS(s)+2NO3-(aq)+2Na+(aq)
November 9, 2010

math
how does the integral of cscx = ln|cscx - cotx|+C and ln |tan x/2|+C?
November 7, 2010

Chemistry- volumn
chemistry: 50mL HNO3 + 50.5mL HaOH = volumn?
November 5, 2010

chem
calculate the molality of a solution that has 1.02kg sucrose (C12H22O11), dissolved in 554g water.
October 27, 2010

intro to chem
Thank you Drbo22...but if it dosent make sence I'm sorry but thats what the tearche wrote in the paper he gave us...
October 27, 2010

intro to chem
disolving sucrose, NaCl< and calcium chloried affect the boiling point of frezing point of water. Assuming that you have 0.1m solution of all these 3 compounds: a)rank then in order of decreasing freezing point. b) rank in order of increasing boiling point c)why do the ...
October 27, 2010

math
thank you soooooooo much! this really helped me allot! ( had an answer on my paper didn't know it so I looked it up) he he (:c) <-- monkey
October 20, 2010

english
someone can help me with a discription with this KEY WORDS: advertising billboards, buskers, clowns, drama groups, fireworks, graffiti, 'live statues', musicians, open-air concerts, pavement artists, sculptures, statues.
October 18, 2010

Spanish
How do I say in sentence form my favorite holiday is christmas and the date.
October 12, 2010

Algebra-Pleasehelp-I'm so stuck!!
Thank you
October 11, 2010

Algebra-Pleasehelp-I'm so stuck!!
Please help How do you graph the radical that is below negative of the sqrt(x+1) my teacher said we should set up x and y according to parent function. The endpoint of this would be (-1,0) How do I find the other points-I'm really stuck
October 11, 2010

physics
A man pulls a crate of mass 61.0 kg across a level floor. He pulls with a force of 178.0 N at an angle of 20.0� above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate starts from rest...
October 8, 2010

PHYSICS
A jet flying at 135 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.82*10^5 kg. Calculate the magnitude of the necessary lifting force.
October 5, 2010

PHYSICS
thanks you so much
October 5, 2010

PHYSICS
A 9.5-kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial distance of 80 cm between the branch and the point where the monkey's mass is located. As the monkey swings through the lowest point on the circle...
October 5, 2010

Physics
riding in a car at constant velocity and see an open manhole. I take out an watermelon and hold it out window. My speed is 10m/s and the initial height of watermelon or any fruit is 1 m. I need to do a calculation to be able to know how far ahead of manhole I have to drop ...
October 3, 2010

Physics
I riding in a car at constant velocity and see an open manhole. I take out an watermelon and hold it out window. My speed is 10m/s and the initial height of watermelon is 1 m. I need to do a calculation to be able to know how far ahead of manhole I have to drop watermelon so ...
October 3, 2010

geometry
6
October 1, 2010

English-Ms. Sue could you look at this
I'm not sure who is the speaker in The Journey-is it your conscience or someone else looking back? Please give me your opinion
September 28, 2010

English
Who is the speaker in Journey by Mary Oliver.Is it your conscious directing you, telling you what you must do?
September 28, 2010

Orgo - recrytalization
thanx
September 27, 2010

Orgo - recrytalization
180mg of crude benzoic acid was recrystallized in an appropriate solvent, with a percent recovery of 67%. How much benzoic acid was recovered?
September 27, 2010

italian
ok thanks anyway !!
September 27, 2010

italian
i dont want it from internet but self made
September 27, 2010

italian
i need an essay in italian about the shopping mania.please help me
September 27, 2010

Spanish
Thank you
September 23, 2010

Spanish
Is this correct how I answered these two questions? Donde vive presidente de los Estados Unidos? My answer: El presidente vive en Washington, D.C. De donde es tu amigo? Answer: El amigo es de Colombia. I know I didn't use accent marks-I will put those in, just wanted to ...
September 23, 2010

math
I can't find the definition and a picture example of distance-time-rate of speed. Help!
September 21, 2010

english
Make a list of expressions that are followed by the '-ing' form
September 21, 2010

Math - Rational Roots
1.) What are the possible rational roots of the function f(x) = 3x^4 - x - 2 2.) What are the rational roots of the following equation: x^3 - 4x^2 - 4x +16 = 0 Thank you for any help!
September 12, 2010

physics
What equation should I used for a water bottle rocket lab? I am using distance vs volume of water. Of course, the volume of water is my independent variable. What equation should I use for this lab?
August 31, 2010

Child Psychology
guidance counselor
August 25, 2010

ALGEBRA
well, it also has a graph with a landscape layout but it will not past into this is there another way i can submit it for help? I am looking for someone to help with a few assignments
August 21, 2010

ALGEBRA
Landscape Design Landscape designers often use coordinate geometry and algebra as they help their clients. In many regions, landscape design is a growing field. With the increasing popularity of do-it-yourself television shows, many homeowners are becoming amateur landscape ...
August 21, 2010

prealgebra
THANK YOU!!!
August 20, 2010

prealgebra
the value, v, of a shopkeepers inventory software program is given by v= -(1)/(2)t+5 where t is the number of years since the shopkeeper bought the program. What is the program worth 4 years after its first year purchased? Plot the point with the given t-value, 4
August 20, 2010

Math - Calculus
What is the domain of this function?: y= ln(2x-12)
July 19, 2010

Math - Calculus
Which of the following expressions are identical? a. (sinx)^-1 b. arcsinx c. sin x^-1 d. 1/sinx
July 19, 2010

Math - Calculus
I have to solve for x in this problem: (3x+5)/[(x-1)(x4+7)=0
July 19, 2010

english
No, it's an adverb because it is modifying the adjective please. :)
July 19, 2010

physic
I find it easier to view this from a mathematical standpoint: electric potential = electrical PE/ charge If the charge is 0, you have electric potential = electrical PE/ 0 you cannot have a zero in the denominator.
July 15, 2010

kindergarten
Use hook on phonetics Its a combination of objects and sound
July 3, 2010

accounting
How formulate your transcations on a general journal then post it to a general ledger
June 26, 2010

chemistry
How much energy would be needed to vaporize 150 grams of ethanol when it is at its boiling point? Hear of Vaporization (kj/kg)...841.00
May 23, 2010

Calculus
A 10 foot ladder leans against a 20 foot wall. Someone begins pushing the base of the ladder toward the wall at the rate of one foot per second. How quickly is the top of the ladder moving up the wall after 2 seconds?
May 6, 2010

Geometry
I need to find surface area of triangular prism-dimension of base is 9.9 by 6.2 distance between bases is 14.6 choices are: 436.278 466.97 332.94 253.46 Thank you
May 3, 2010

Chemistry
I'll let you know-thank you
May 3, 2010

Chemistry
Hi, this is a reply to the question I asked earlier. I asked about the classification and functional group of an organic compound. It has bonds between H-C-C-H. Off of each Carbon is single bonds of Hydrogen above and below. making a total of 6 Hydrogens and two carbons. They ...
May 3, 2010

Chemistry
No, I looked at the diagram again-this is what is baffling me-the diagram looks as if it is ethane and I also figured it couldn't be any of those functional groups- but that is all that is given. Ethane is an alkane, correct? So for the classification of ethane, would that...
May 3, 2010

Chemistry
Help please! I need to identify an organic compound and tell the functional group of the molecule- the compound is single-bonded ,it is composed of a middle chain H,C,C,H. Off both carbons are single chains consisting of a H above and below each of the carbon. What ...
May 3, 2010

Chemistry
When HCl(aq) is exactly neutralized by NaOH(aq), the hydrogen ion concentration in the resulting mixture is a. always equal than the concentration of the hydroxide ions b.sometimes greater and sometimes less than the concentration of the hydroxide ion c. always greater than ...
April 20, 2010

chemistry
hi kelley =]
April 4, 2010

chemistry
How many moles of SO2 are required to make 125 mol CS2 How many moles of carbon monoxide form at the same time that 0.255 mol CS2 forms? THANK YOU
March 31, 2010

Accounting
At October 31, Nathan Company made an accrued expense adjusting entry of $1,400 for salaries. Prepare the reversing entry on November 1, and indicate the balances in Salaries Payable and Salaries Expense after posting the reversing entry.
March 27, 2010

4th grade
to subtract two decimals, line them up using the ?
March 25, 2010

Science
Knowing about covection currents, how do heaters warm the whole house?
March 25, 2010

chemistry
Use Boyle's Law (P1V1=P2V2) 3.0atm*24L=P2*16 )3.0atm*24)/16=P2 After calculating, the pressure ends up being 4.5atm (:
March 16, 2010

5th grade
You should first convert 1.4t into kg. Then from that number subscribe empty trailer's mass and you will get the answer
February 28, 2010

com 150
checkpoint week 6 com 150 my topic is Understanding the Effects of Domestic Violence
February 25, 2010

Physics
Recall that for a finite rod of length L and total charge Q, the electric field for a point located a perpendicular distance r from the middle of the rod has a magnitude given by: Consider the limit of large distances, where a finite charged rod is observed at a distance that ...
February 11, 2010

english/analogies
fifteen:five::nine:
February 9, 2010

Microeconomics
If the equilibrium price of silver is 4 dollars an ounce, under conditions of perfect competition and the industry is in long run equilibrium, will the average total cost of silver be less, equal or exceed 4 dollars?
February 3, 2010

math
sorry i dont get can u explain more clearly pls.
January 24, 2010

math
how do I solve : 1/2 + 2/x =3/4. thanks for helping!
January 24, 2010

HCA 240
Sickle cell anemia
January 23, 2010

8grade math
171 _____ 180
December 17, 2009

Math, please check work
Find the other end point of the line segment with the given endpoint and midpoint. Endpoint; (-4,-4),(midpoint:(7,3)
December 17, 2009

math,variables and expressions
explain how you could show five less than a number using an expression?
December 16, 2009

spanish
what does it mean "usted por que es tan bonita?"
December 5, 2009

physics
The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? I got 2.5 x 10^-21 which is correct. The second question states: Two carbon atoms are joined by a spring-like carbon-carbon bond. The potential energy stored ...
November 30, 2009

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