Saturday
August 29, 2015

Posts by Veronica


Total # Posts: 358

math
In a science experiment, the temperature of a glass of water rose 18.24 degrees after six hours. If the temperature rose the same number of degrees per hour, then how many degrees did the water increase per hour?
July 16, 2015

calculus
radioactive Carbon 14 in a dead organism decays according to the equation A=A e^.000124t where t is in years and A0 is the amount at t=0. Estimate the age of a skull uncovered in an archeological site if 10% of the original Carbon 14 is still present.
July 3, 2015

science
calculate the net force on an object that has a mass of 12kg and acceleration of 4m/sec
March 13, 2015

higher school
determine the fishers' ideal price index formular from both the laspeyre and paasche price indices formular
March 4, 2015

Statistics
With a known population mean of 100, and a known standard of error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is equal to 110 or greater?
February 27, 2015

Algebra
I am so very confused :(
February 27, 2015

Algebra
I need some help with this question I really don't understand it and some help going through this problem would be really appreciated :) Use the fact that a/b/c/d=a/b / c/d to simplify each rational expression. State any restrictions on the variables. x^2-1/x^2-9 / x^2+3x-...
February 27, 2015

6TH GRADE MATH
N<7 is the correct answer
February 5, 2015

Math
Explain how to solve the following system of equations. What is the solution to the system? 2x+2y+z=-5 3x+4y+2z=0 x+3y+2z=1
January 21, 2015

Math
Would the answer be c?
January 21, 2015

Math
Every year in Delaware there is a contest where people create cannons and catapults designed to launch pumpkins as far in the air as possible. the equation y=15+110x-16x^2 can be used to represent the height, y, of a launched pumpkin, where x is the time in seconds that the ...
January 21, 2015

math
At a given time, Saturn was 9.1 x 10 to the 8th miles from the sun and the earth was 9.3 x 10 to the 7th miles from the sun. by what distance is one planet closer to the sun than the other planets?
January 14, 2015

PHYSICS
A uniform plank with mass 20kg and length 12m extends 2m over the edge of a building. A 40kg crate is slid out on the plank. how far can the crate be pushed without toppling the plank? A. 0.5m B. 1m C. 1.25m D. 1.5m E. 2m
January 4, 2015

Physics
A 3kg mass is sliding across a horizontal surface at a constant speed while being pulled by rope with tension 20N held at a 53 degree angle above the horizontal. The force of friction is most nearly A. 30N B. 12N C. 16N D. 20N E. 1N
January 4, 2015

Struggling in Writing
Thank you for your optimism! After reading your posts, I felt more encouraged and more motivated to try my best. Have a wonderful day! :) Writing well will be my goal!
December 4, 2014

Struggling in Writing
Should I be ashamed for being a poor writer and reader,since I am in 12 th grade this year? Today,in writing class I struggled.. I could not identify the thesis of an article nor could I spot counterclaim that the author makes. I think I have dyslexia because I have a hard ...
December 4, 2014

8th grade English/Language Arts
Thank you Ms.Sue. You are very great with this homework helping are you the coordinator
October 28, 2014

8th grade English/Language Arts
Okay, please help me with the rest
October 28, 2014

8th grade English/Language Arts
1.)Why does the author of “Always to Remember” discuss Maya Ying Lin’s background? a.)to show that she experienced hardships b.)to appeal to Chinese-American readers c.)to show its influence on her design d.)to show her disinterest in architecture 2.) Which of ...
October 28, 2014

8th grade; English
Can someone post the answers I am tutoring my brother with english and i need some work problem i think this is a good work examples.. answer asap
October 25, 2014

statisitcs
The combined math and verbal scores for students taking a national standardized examination for college admission is normally distributed with a mean of 560 and a standard deviation of 180. If a college requires a student to be in the top 40 % of students taking this test, ...
October 23, 2014

Science
They were wrong because it said that in my book but thank you so much
September 29, 2014

Science
May you please tell me if these are true or false, if they are false then can I have the true statement, thank you In the water cycle, water returns to Earth as (condensation) usually in the form of rain or snow During dry weather, the water level in a small pond drops because...
September 29, 2014

math
I thought that you had to cross off the two zero's from each side.That is what my teacher has told me.
September 25, 2014

math
Yes it could be simplified to 5/9.
September 25, 2014

MATH
A HUMMINGBIRD BEATS IT WINGS 53X SEC HOW MANY TIMES DOES THE HUMMINGBIRD BEATS IN 5 SEC
September 11, 2014

Science
Why are aboriginal clan systems considered human social systems?
September 6, 2014

English
Start with your interests like. Fore say you like the arts. Explain how you feel about it. The begging should always be different that the others. Something unique about yourself. Of course you can also start saying what is you name. Bot it's your call
September 6, 2014

AP Physics
Two locomotives approach each other on parallel tracks. Each has a speed of v = 85 km/h with respect to the ground. If they are initially d = 7.0 km apart, how long will it be before they reach each other?
September 5, 2014

AP Physics
A car traveling 92 km/h is 130 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?
September 5, 2014

health
what is the answer?
September 3, 2014

Pre Cal
Two forces with magnitudes of 100 and 50 pounds act on an object at angles of 50° and 160° respectively. Find the direction and magnitude of the resultant force. Round to two decimal places in all intermediate steps and in your final answer.
August 5, 2014

chemistry
When 3.00 moles of sodium are reacted with large amounts of chlorine gas 145.8 g of sodium chloride are produced determine percentage yield
July 16, 2014

Finacial Accounting.
I am really struggling with this question and my accounting book is no help at all. A company has $4500 in net sales, $3200 in gross profit, $1300 in ending inventory, and $1800 in beginning inventory. What is the cost of goods sold? Im not looking for the answer, just a ...
June 29, 2014

Chemistry
A solution buffered at a pH of 5.00 is needed in an experiment. Can we use acetic acid and sodium acetate to make it? If so, how many moles of NaC2H3O2 must be added to a 1.0L of a solution that contains 1.0 mol HC2H3O2 to prepare the buffer. The Ka of acetic acid is 1.8x10^-5...
June 20, 2014

Chemistry
Determine the concentration of CO32- ions in a 0.18 M H2CO3 solution. Carbonic acid is a diprotic acid whose Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.
June 18, 2014

Chemisty
A 0.411 g sample of powdered copper mixed with an inert, soluble additive was fully consumed by 23.4mL of 0.602M nitric acid, producing copper (II) nitrate, water, and nitric oxide. What is the percent copper by mass in the sample? 3Cu + 8HNO3 = 3Cu(NO3)2 +2NO =4H2O
June 17, 2014

Chemistry
what is the pH solution in which 15 mL of 0.10 M NaOH has been added to 25 mL of 0.10 M HCl
June 10, 2014

Chemistry
the answer is 0.75mol SO2 but I don't understand where to even begin
June 9, 2014

Chemistry
Consider the following equilibrium. 2 SO2 (g) + O2 (g) 2 SO3 (g) The equilibrium cannot be established when __________ is/are placed in a 1.0-L container.
June 9, 2014

Chemistry
what volume (mL) of 0.0962M NaOH is required to neutralize 10.0mL of 0.128M H2SO4? I got 26.6mL
June 8, 2014

algebra
4x^3-6.68E-7x^2+1.67E-8x-1.04E-10 = 0
June 8, 2014

Math
4x^3-6.68E-7x^2+1.67E-8x-1.04E-10 = 0
June 8, 2014

Chemistry
I posted this last night, A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^-7 2 H2S <--> 2 H2 + S2 I have come up with this equation so far, but I am lost now because I don’t even know if this ...
June 8, 2014

Chemistry
How many grams of pure H2SO4 can be obtained from 250 grams of iron ore if the ore is 82% FeS2? The reactions involved are given below: 4FeS2 + 11 O2 --> 2 Fe2O3 + 8 SO2 (95% efficient) 2SO2 + O2 --> 2SO3 (90% efficient) SO3 + H2O --> H2SO4 (90% efficient)
June 7, 2014

Chemistry
I got this equation but now I am lost 1.67x10^-7 = ((4x^2)(x)) / (0.000625-4x^2)
June 7, 2014

Chemistry
A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^-7 2 H2S <--> 2 H2 + S2
June 7, 2014

Chemistry
I posted this question before and the answer is suppose to be 6.8 L but I keep getting 6.12 L dinitrogen pentoxide n2o5 decomposes by a first-order decomposition in chloroform solvent to yield NO2 and O2. The rate constant at 45°C is 6.2 x 10^-4 mins^-1. Calculate the ...
June 3, 2014

Chemistry
I keep getting 6.12 and the answer is suppose to be 6.8
June 3, 2014

Chemistry
dinitrogen pentoxide n2o5 decomposes by a first-order decomposition in chloroform solvent to yield NO2 and O2. The rate constant at 45°C is 6.2 x 10^-4 mins^-1. Calculate the volume of O2 obtained from the reaction of 1.00 mol N2O5 at 45°C and 770 mmHg after 20.0 hours...
June 3, 2014

Chemistry
Or this balanced equation actually N2O5 = 2 NO2 + 1/2 O2
June 3, 2014

Chemistry
dinitrogen pentoxide n2o5 decomposes by a first-order decomposition in chloroform solvent to yield NO2 and O2. The rate constant at 45°C is 6.2 x 10^-4 mins^-1. Calculate the volume of O2 obtained from the reaction of 1.00 mol N2O5 at 45°C and 770 mmHg after 20.0 hours...
June 3, 2014

Chemistry
Nevermind I got the answer myself!
June 3, 2014

Chemistry
The potassium salt of benzoic acid, potassium benzoate, KC7H5O2, can be made by the action of potassium permanganate on toluene, C7H8. C7H8 + 2 KMnO4 --> 2MnO2 + KOH + H2O If the yield of potassium benzoate cannot be realistically be expected to be more than 71%, what is ...
June 3, 2014

Chemistry
The first order rate constant is 1.87 x 10^-3 min^-1 at 37°C for reaction of cisplatin. Suppose the concentration of cisplatin in the bloodstream of a patient is 4.73 x 10^-4 mol/L. Calculate the concentration exactly 24 hours later.
June 3, 2014

Chemistry
How many grams of commercial C2H4O2 (97% pure by mass) must be allowed to react with an excess of PCl3 to produce 50.0g of C2H3OCL if the reaction has a 70% yield? 3C2H4O2 + PCl = 3C2H3OCl + H3PO4
June 2, 2014

Chemistry
I actually was able to figure it out
May 31, 2014

Chemistry
0.135m
May 31, 2014

Chemistry
How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.
May 31, 2014

Chemistry
At 20°C, an aqueous solution that is 18.0% by mass in ammonium chloride has a density of 1.0512 g/mL What is the molarity of ammonium chloride in the solution?
May 31, 2014

Chemistry
the solubility of 1-butanol in water is 7.9g per 100g of water. What is the maximum amount of 1-butanol that will dissolve in 5.9g of water
May 31, 2014

Chemistry
What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 6.25m? The density of the solution is 1.2219 g/mL
May 31, 2014

Chemistry
A sulfuric acid solution that is 65.0% H2SO4 by mass has a density of 1.55 g/mL at 20°C. What is the mass of h2so4 per liter of solution?
May 31, 2014

Chemistry
Manganese trifluoride, MnF3,can be prepared by the following reaction. 2 MnI2 (s) + 13 F2 (g) ---> 2 MnF3(s) + 4 IF5(l) What is the minimum number of grams of F2 that must be used to react with 12.0 g of MnI2 if the overall yield of MnF3 is no more than 75% of theory?
May 26, 2014

Chemistry
If 150 mg of aspirin are rinsed with three portions of 10 mL of water at 25 degrees Celsius, how much aspirin is recovered? Solubility of aspirin in water at 25 degrees Celsius is one gram of aspirin per 300 mL of water.
May 20, 2014

Pre-cal
D) 2log10+log1000-log1
May 14, 2014

Pre-cal
Simplify: A) log(x+1)+3logx B) 2log4np-3log4p C) 2ln(3x)+ln(5x)-ln6xy D) 22log10+log1000-log1
May 14, 2014

Pre - Cal
1. Find the vertex of the parabola: 4y^2+4y-16x=0 2. Find an equation of the parabola, opening down, with vertex (-3,1) and solution point (4,-5). 3. The main cables of a suspension bridge are 20 meters above the road at the towers and 4 meters above the road at the center. ...
May 5, 2014

physics
a rod is having a positive charge and a point charge is placed at a distance 'd' from it making angle 45 degree with one end and 37 degree with the other.calculate field. plz answer its urgent.
April 10, 2014

chemistry
How many grams of magnesium are required to produce a total of 4.05g of hydrogen
April 2, 2014

Physics
Prove that tanø is equal to U(k) when the block slides down the incline with a constant speed. (Use symbols, not numbers.)
March 19, 2014

science
foxes eating mice or leaves growing on trees or rabbits easting clover or fleas living on cat
February 17, 2014

science
a consumer-producer relationship is best illustrated
February 17, 2014

scince
as you drive down the highway you may see crows feeding on dead animals. as a result of this nutritional pattern,crows may be classified as
February 17, 2014

chemistry
solve net ionic equATION Ba(OH)2 + Na2SO4
February 13, 2014

Math
A swing has a maximum height of 2 m and a minimum height of 0.5 m and it takes 3 seconds to get from the maximum height to the minimum height. Approximate the instantaneous rate of change 1 second into the fall using the difference quotient when h is 0.01. a)-1.3650 b)-0.1973 ...
November 29, 2013

Chem
I can't find the value x by calculation. It ends up to give me a quadratic equation and the value of x is negative! please help me ASAP...
November 8, 2013

math 5th grade
59425
September 17, 2013

chemistry
How would you prepare 500mL of 6.0M NaOH solution using solid NaOH pallets?
August 8, 2013

Informal logic
Catherine goes to her local movie theater only to see romantic comedies. Since Catherine did not go to the movies yesterday, there is not a romantic comedy playing at her local theater. The reasoning above is flawed because the evidence does not suggest that Catherine goes to ...
July 14, 2013

Informal logic
All sages provide both wisdom and inspiration. Since Dasha’s speech contained wisdom and greatly inspired her audience, Dasha is a sage. Which one of the following points out the flaw in the argument above? (Points : 1) -Just because Dasha is a sage doesn’t mean that...
July 14, 2013

chemistry
to what volume should you dilute 0.100L of a 15M NaOH solution to obtain a 1.0M NaOH solution
July 10, 2013

physics
scientific interpretation of two toy cars having bar magnet on the roof .what happen when close to each other from same and different direction?
July 2, 2013

Math
Given the altitude of lakes in feet: –12, –9, –14, –39, –49, –49, –18, –43, find the mean, median, mode, and range
April 22, 2013

chemistry
A reaction produced 0.40 mmol of H in a buffered solution which contained 300ml of 0.06M succinate buffer, pH is 4. What was the pH of the medium after the reaction was completed? The pKa of succinate buffer is 4.21
April 19, 2013

chemistry
To what volume should 100ml of any weak acid (HA) with a concentration of 0.2M be diluted to double the percentage ionization?
April 19, 2013

Chemistry
The of hydroxylamine, , is . A buffer solution is prepared by mixing 120 of a 0.34 hydroxylamine solution with 60 of a 0.25 solution.Solve for the PH
April 19, 2013

Chemistry
What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.030 M CH3CO2Na? Assume that the volume of the solutions are additive and that a = 1.8 × 10-5 for CH3CO2H.
April 19, 2013

trig
Find the first two terms a_1 =5 and an=3a _n-1+2
March 24, 2013

Chemistry
2Al(s)+3Cl2 = 2AlCl3 Limiting Reactant is Cl with 0.329mol. What is the maximum mass of aluminum chloride that can be formed when reacting 30.0g of aluminum with 35.0g of chlorine?
February 26, 2013

Chemistry
What is the maximum mass of aluminum chloride that can be formed when reacting 30.0g of aluminum with 35.0g of chlorine
February 26, 2013

statistics
Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.
February 26, 2013

statistics
Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.
February 26, 2013

math
133ft.
January 21, 2013

math
A 6ft man stands next to a 100ft. tall building. the man's shadow is 8ft. long. How long is the building's shadow?
January 21, 2013

math
how can i find four equivalent expressions example: 50+225
December 11, 2012

chemistry
Steve, in an attempt to impress his girlfriend, plops 18.2 grams of sodium metal into 500 mL of concentrated phosphoric acid (density = 1.88 g/cm3) in a beaker. The reactants were both initially at 25 oC. The reaction gently produced bubbles of hydrogen and Janet was not ...
December 9, 2012

Chemis
Steve, in an attempt to impress his girlfriend, plops 18.2 grams of sodium metal into 500 mL of concentrated phosphoric acid (density = 1.88 g/cm3) in a beaker. The reactants were both initially at 25 oC. The reaction gently produced bubbles of hydrogen and Janet was not ...
December 9, 2012

Chemistry
Strontium metal is responsible for the red color in fireworks. Fireworks manufacturers use strontium carbonate, which can be produced by combining strontium metal, graphite (C), and oxygen gas. The formation of one mole of SrCO3 releases 1.220 x 103 kJ of energy. a) Write a ...
December 3, 2012

Chemistry
Compute the ƒ´Hrxn for the following: CH3OH „³ H2CO + H2 Carbon is the central atom on both the starting material and the product.
December 3, 2012

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