Friday
March 6, 2015

Posts by MIchelle


Total # Posts: 1,693

CHEMISTRY!!!!
Determine the pH at the equivalence point in the titration of 41.0 mL 0.096 M formic acid with 0.108 M NaOH at 25oC. Calculate the pH of a solution that is 0.22 M pyridinium ion (C5H5NH+) at 25oC.
March 5, 2015

Chemistry! Please Help!
I have part b if that helps 100 g of CacO3 give 44 g of CO2 so 12 g will give 5.28 g of CO2 so moles of CO2 = 0.12 moles Volume = 0.12 X 22.4 L = 2.688 L PV = nRT Pressure = 0.12 X 0.0821 X 998 / 2.688 = 3.65 atm
February 26, 2015

Chemistry! Please Help!
Lime (CaO) is used to prevent SO2 from escaping smokestacks of coal burning power plants by the formation of solid CaSO4•2H2O also known as the mineral gypsum. One of the important reactions in the overall process is the dissociation of CaCO3(s). b. If a 12.0 g sample of ...
February 26, 2015

Math
The math question is "in a piggy bank there is a total of $15.75. If the ratio of dimes to quarters is 5:7, find the total amount in quarters. My question is, what formula would I use to solve this?
February 19, 2015

Chemistry!!!!
1. For a reaction mechanism to be plausible, what 2 criteria must be met? 2. The reaction between CO and NO2 to produce NO and CO2 is thought to occur in 2 steps. NO2 + NO2 ====> NO + NO3 NO3 + CO =====> NO2 + CO2 The experimental rate law is, R=k[NO2]2 Write the ...
February 12, 2015

Chemistry!!!!
1. For a reaction mechanism to be plausible, what 2 criteria must be met? 2. The reaction between CO and NO2 to produce NO and CO2 is thought to occur in 2 steps. NO2 + NO2 ====> NO + NO3 NO3 + CO =====> NO2 + CO2 The experimental rate law is, R=k[NO2]2 Write the ...
February 12, 2015

physics
A man named Harold is standing in a train car that has no windows. Since there aren't any windows, he doesn't know how fast or in what direction the train is moving or whether it is accelerating or decelerating. Harold decides that he might be able to figure something ...
February 11, 2015

chemistry
Balance redox reaction. Fe(s) + O2(g) + H2O(l)-->Fe2+(aq) +OH-
February 8, 2015

Physical science
A 70-kg man and a 50-kg woman are in a 60-kg boat when its’ motor fails. The man dives into the water with a horizontal speed of 3 m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1 m/s? If not, can the woman ...
February 6, 2015

Chemistry
1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys Raoult’s Law: Pi=XiPio Two volatile ...
February 4, 2015

biochemistry
Calculate the pH of the solutions obtained by dissolving the following in a liter of water: 0.2 mole of glycine plus 0.1 mole of NaOH I know the answer is ph = 9.60 which i know is pka2 of glycine but im not sure how to set up this question. This is just a practice problem for...
January 30, 2015

English (Dracula)
ok thank you!!! i like night stalker
January 20, 2015

English (Dracula)
I am making a Wanted Poster of Dracula and i dont know what statement to put about him below the picture of him. i was thinking like: Evil Count and Blood Thristy
January 20, 2015

Dracula novel
What are some physical and psychological attributes of Dracula
January 20, 2015

Calc Physics
The velocity as a function of time for an asteroid in the asteroid belt is given by v(t)= vo e^(-t/to)i + (vo t/ 2 to) j with vo and to constants. Use ti = 0 as the initial time, and tf = 472 s as the final time. The values for the constants that you will use are: vo = 9 m/s ...
January 17, 2015

math
Problem: A ball is dropped from the top of a building that is 250 feet tall. The height h of the ball in feet after t seconds is modeled by the function h = -16t2 +250. How long will it take for the ball to reach the ground? Round your answer to the nearest tenth if necessary.
January 13, 2015

chemistry
Sulfuric acid is dripped onto samples of three metals: silver, =zinc, and aluminium a) Use the activity series to determine whether a reaction will occur with each metal b) Write a chemical equation for each reaction that occurs
January 11, 2015

algabra
Janie's couch is 7 1/2 feet long.the scale of the dollhouse is 1 inch:2feet. what is the length of the miniature couch for the dollhouse?
January 10, 2015

chemistry
a 2.00l buffer contains 1.00 mol HNO3 mixed with 1.00mol NaNO2 a. write the relevant ionization equation for this buffer. b. determine its pH c. determine the new pH if 1.00g of NaOH is added to the buffer
January 1, 2015

Math
rick has a box of coins. The box contains 51 coins. Which consist of pennies, dimes and quarters. The number of pennies equal the number of dimes the total value of the box of coins is 5.73. How many dimes? how many pennies ? how many quarters?
December 19, 2014

math
A company will need 55,000 for a new addition. To meet this goal the company deposits money in an account today that pays 5% interest annual compound quarterly. to meet this goal in five years what would the company need to deposit today?
December 18, 2014

Math
given the function f decribed by f(x)=-x-6, find f(-7)=?
December 16, 2014

ap physics
a 37.4-kg traffic light is supported by two wires prove you answer applying newtons law
December 4, 2014

Chem 130
Carbon monoxide burns in oxygen to form carbon dioxide. what volume of oxygen at 25 degrees Celsius and 760. mmHg is required to react with 15.0 L of carbon monoxide which id at STP?
December 1, 2014

Algebra 2
Solving Quadratic Systems x^2+y^2=2 x^2-6y=10 I'm having trouble solving this problem.
December 1, 2014

math
a company will need $30.000 in 7 years for a new addition. To meat this goal the company deposits money in an account today that pays 7% annual interest compounded quarterly. find the amount that should be invested to total $30.000 in 7 years?
November 28, 2014

IT
The No Interest Credit Company provides zero-interest loans to customers. Design an application that gets customer account data, including an account number, customer name, and balance due. Output the account number and name, then output the customer's projected balance ...
November 27, 2014

math!!
5^6 * 5^3
November 26, 2014

math
can you explain more im lost . plz
November 26, 2014

math
conver the numeral to a numeral in base 10 1101 basetwo can some one plz help .
November 26, 2014

math
(-q^2 +3)(q^2 -2)mulitply
November 21, 2014

math
multiply (-5-p)(5+p)
November 21, 2014

Math
multiply -p(p+q+2)
November 21, 2014

Physics
A naked person (e=0.75) with a surface area 2.00 square meters and a skin temperature of 34 degrees Celsius is in sauna at 90 degrees Celsius. If he stays in the sauna for 30 minutes, (a) How much heat does the perspn radiates? (b) How much heat does he absorb from the walls ...
November 19, 2014

chemistry
Consider the reaction, 3 H2(g) + N2(g) => 2 NH3(g). How many grams of NH3 will be made by the reaction of 3 moles of H2(g) with 18 moles of N2(g
November 16, 2014

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of B2O3 are made by the reaction of 233.8 g of O2
November 16, 2014

chemistry
Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of O2 are needed to make 432.7 g of H2O?
November 16, 2014

chemistry
2.15 g of a substance X contain 4.34 x 1022 molecules of X. Calculate the molar mass of X in g/mol.
November 16, 2014

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 4.2 x 1023 molecules of N2? Give your answer to one decimal place.
November 16, 2014

chemistry
Consider the equation: N2 + 3 H2 =>2 NH3. How many moles of NH3 will be made from 2.1 x 1024 molecules of N2?
November 16, 2014

chemistry
Consider the reaction, 4 NH3 + 5 O2 => 4 NO + 6 H2O How many grams of NO will be made from 10.7 moles of O2?
November 16, 2014

Pre Albergra
The Pentagons ABCDE and PQRST are Similar: Find the length x of TP
November 16, 2014

Chemistry
How many moles of CO2 will be made from 115.4 grams of C3H8?
November 16, 2014

Question
What Behavior objective for large motor skills?
November 15, 2014

Physics
A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire
November 15, 2014

Physics
would the answer by 3827
November 15, 2014

Math
convert the repeating decimal to a/b where a,b are integers and b #0.
November 14, 2014

Stats
A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n...
November 11, 2014

chem
what is the percent yield of the reaction between 5.2 mL of 0.1233 M barium nitrate and 4.9 mL of 0.1256 sodium sulfate if 0.140 grams of the precipitate are produced? Formula?... BaNO3(aq) + Na2SO4(aq) --> Na2NO3(aq) + BaSO4(s)
November 11, 2014

Chem 130
What mas of liquid mercury should be produced by the reaction between 5.0 mL of 0.1102 M mercury(II)nitrate ans 0.621 grams of silver metal? would the formula be... Hg(NO3)2(aq) + 2Ag(aq)--> 2AgNO3(aq) + Hg(l)
November 11, 2014

Physics
A small ball with a mass of 30.0 g is loaded into a spring gun, compressing the spring by 13.0 cm. When the trigger is pressed, the ball emerges horizontally from the barrel at a height of 2.30 m above the floor. It then strikes the floor, after traveling a horizontal distance...
November 11, 2014

math
James wishes to make a deposit. He has these bills: 16 ones, 5 fives, 5 tens, and 3 twenties. He has 4 nickels, 20 dimes, and 16 quarters. James has checks for $66 and $53.75. James wants to receive $50 in cash. What should he enter on the TOTAL line? $
November 7, 2014

Chem 130
How many tons of zinc can be obtained from 976 tons of zinc ore that is 78.0% zinc carbonate?
November 4, 2014

Chem 130
What is the percentage of water in copper (II) sulfate pentahydrate?
November 4, 2014

English
D is the best choice
November 4, 2014

English
Which of the following is the best version of a thesis statement about charter schools? a. A charter school is a tax supported established by a charter between a school board and outside group of teachers or parents. b.A charter school operates without local and state ...
November 4, 2014

English
All of the following are true special predicates except. A. A compound predicate is one that is passive. B. A predicate can have direct or indirect object. C.When a predicate is passive ,the subject is being acted upon rather an acting. D. A predicate may consist of two or ...
November 4, 2014

English
d. all of the above
November 4, 2014

English
A prepositional phrases include A. A preposition as about or above. B.an object of the preposition that is a noun or pronoun. C. any modifiers of the object of the preposition. d. I am think A
November 4, 2014

English
It not b
November 4, 2014

English
Compound predicates, predicates with direct objects and predicates with indirect objects,passive predicates.
November 4, 2014

English
All of the following are true special predicates except. A. A compound predicate is one that is passive. B. A predicate can have direct or indirect object. C.When a predicate is passive ,the subject is being acted upon rather an acting. D. A predicate may consist of two or ...
November 4, 2014

chem
How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
November 4, 2014

Chem 130
How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
November 3, 2014

math
f(x)= x^3 - 2x^2 - 21x - 18 all possible rational zeros # of possible positive zeros # of possible negative zeros find all the real zeros
October 30, 2014

Chem 130
How many grams of Aluminum oxide will be produced when 2.44 grams of Aluminum burns in air (i.e. react with Oxygen)?
October 29, 2014

Chem 130
wrong formula, would it be... MgCl2 ---> Mg + HCl
October 29, 2014

Chem 130
HNO3 + Al2O3 ---> Al(NO3)3 + H3O?
October 29, 2014

Chem 130
I want to make sure I have the correct double replacement formula. would it be
October 29, 2014

Chem 130
How many grams of magnesium chloride should be produced by the single displacement reaction between 0.578 grams of magnesium metal and an excess hydrochloric acid?
October 29, 2014

Literature
"Write a monologue revealing the unspoken thoughts and feelings of one of the characters in "Everything Stuck to Him." Use the personal pronoun "I." Choose one of the following scenes to step into the character's mind: a) the girl sitting up alone ...
October 29, 2014

Physics
A cargo plane is flying horizontally at an altitude of 11.2 km with a constant speed of 1260 km/hr when a large crate slides out of the rear of the plane. How long does it take the crate to hit the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of s, please.
October 27, 2014

Chemistry
What does n equal in the dH equations? number of moles?
October 26, 2014

Chemistry
A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture? PLEASE HELP! I do not know where to even start!
October 26, 2014

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
October 22, 2014

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
October 22, 2014

Physics: mechanics
A 250g bullet with a speed of 500m/s passes through the center of a 1.5kg square wooden block [ side length 18cm] at rest upon a horizontal frictionless surface. As it exits the block, the bullet has a speed of 150m/s. A) find the initial speed of the center of mass of the ...
October 20, 2014

math
segment A'B is the image of segment A'B after a translation up by 6 units
October 16, 2014

English (Macbeth)
Act 3 What information is the audience given about the following characters: Malcolm Macduff Edward the Confessor Siward i really need help i think the answer for macduff is that he is trying to convince malcolm to help him overthrow Macbeth
October 13, 2014

Physics graphing
Im making a graph of magnetic force vs current, after investigating the magnetic force exerted on a current-carrying wire, and how it varies with current, length, magnetic field and angle. How do I know when to use the point (0,0) on the graph?
October 13, 2014

Biology
What is the location and effect of waves of contraction in the digestive system.
October 11, 2014

ENGLISH CLASS
Motivation is poor. complete sentence fragment run-on
October 9, 2014

Biology
Which heart beat measurement is most indicative of your general health? i think it is your resting heart beat, but im not sure the reason
October 5, 2014

English
My interpretation is that the moose resembles Christ due to the pain the moose has gone through, similarly to what Christ went through, such as the crown of thorns, and with the moose a girl puts a purple cap on him.
October 5, 2014

alagbra
5-4(12-3y)=
September 23, 2014

statistics
A sample of 100 patients who use the drug are followed over time. Those that use the drug have a mean life expectancy of 71.30 years. The mean life expectancy for the general population is 75.62 years. The population standard deviation is 28.
September 20, 2014

statistics
the wieights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?
September 18, 2014

statistics
the weights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?
September 18, 2014

Chemistry
Consider 2H2 + O2 ¨ H2O. To produce 0.895 g water, how many grams of O2 are required?
September 15, 2014

computer science
The problem is to calculate the usable area in square feet of a house. Assume that the house has a maximum of four rooms, and that each room is rectangular. I need help writing a program description,analysis,test,and with pseuocode with it.
September 12, 2014

Math
An all girl college began enrolling boys in 2005. By 2012 the ratio of boys to girls was 3 to 7. If there are 200 more girls than boys how many boys are there?
September 6, 2014

Homework
Q=wc(T1-T2) find c Can you help me find out how to do this problem PLEASE !! TY
September 3, 2014

math
to determine the number of trout in a lake, a conservationist catches 111 trout,tags them throws them back into the lake.later 28 throw are caught. 14 of them are tagged. how many trout would be conservationist expect to be in the lake?'
August 26, 2014

Introduction to Psychology
I am working on a written final project and confused on how to apply psychological theories, processes, and concepts to human behavior. When it a person is believed to be suffering from major depression and then I am to Discuss psychological disorders and treatment approaches ...
August 16, 2014

life science
Gls bxs kep the fossls safe and permit people to look at al sides
July 31, 2014

stats
what is the probability that a 6 digit phone number contains at least one 8?
July 19, 2014

Physics
(a) Calculate the linear acceleration of a car, the 0.280 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. (m/s2) (b) How many revolutions do the tires make in 2.50 s if they start from rest? (rev) (c) What is their final angular ...
June 29, 2014

Physics
Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1500 kg and was approaching at 9.00 m/s due south. The second car has a mass of 700 kg and was approaching at 15.0 m/s due west. (a) Calculate the final velocity of the cars. (b) ...
June 26, 2014

Statistics
I'm taking stats online which is making it even more difficult for me and I have nowhere to begin when answering this question. 1. A pharmaceutical industry claimed that their new product will lower the cholesterol level by an average of 14.5. To verify the claim, a ...
June 22, 2014

Physics
The rocket sled shown in Figure 4.5 accelerates at a rate of 29.0 m/s2. Its passenger has a mass of 66.0 kg. Calculate the direction and magnitude of the total force the seat exerts against his body.
June 14, 2014

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