Friday
September 4, 2015

Posts by MIchelle


Total # Posts: 1,776

Physical Chemistry
If 5.00 mL of 3% H2O2 is decomposed, how many mL of gas will be produced at 1.01 bar and 25C?
August 31, 2015

Determining whether expired air contains carbon dioxide
1.Formulate a hypothesis for this investigation 2.State the aim of this investigation 3. a)Independent variable b)Dependent variable c)Controlled variable 4.State methods and the control
August 23, 2015

physics
A car travels at a constant speed of 30 mph for 20 miles, at a speed of 40 fps for the next 20 miles, and then travels the final 20 miles at 90 kph. what is the average speed of the entire trip?
August 23, 2015

Math
The supplement of an angle measures 11 times its complement. Then the measure of the angle is... A. 9 degrees B. 81 degrees C. 90 degrees D. 99 degrees E. 100 degrees
August 3, 2015

Math
Thanks
August 3, 2015

Math
jack and jerry can complete a job together in 4 hours. if jack require 6 hours to do the job alone, how many hours will it take jerry to do the job alone. A.12 B.10 C.8 D.6 E.4
August 3, 2015

chemistry
The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 24.6 g of the compound? Please guide me through it thank you!
July 28, 2015

AP Chemistry
The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 24.6 g of the compound?
July 28, 2015

Math
Thanks
July 10, 2015

Math
Ralph's age is currently 3 years more than twice joe's age. But 3 years ago, ralph was was 4 times as old as Joe was the . How old will joe be in 10 years?
July 10, 2015

Organic Chemistry
Dr. Bob, Thank you for the chart; its really helps. Just to make sure I am on the same page as you. I look up the bonds listed. F-I has the highest deltaHf (kj/mol). So that means that is takes more energy to break that bond; thus have the strong bond?
June 22, 2015

Organic Chemistry
1. Which of the following bonds is the strongest? a. F-F b. F-Cl c. F-Br d. F-I I think it's A because of the same atomic radius. Is that correct? Am I on the right track?
June 22, 2015

geometry
An artist wants to make alabaster pyramids using a block of alabaster with a volume of 576 cubic inches. She plans to make each pyramid with a square base area of 3 square inches and a height of 4 inches. At most, how many pyramids can the artist make from the block of ...
June 19, 2015

Chemisrty
Calculate the grams of substance from the moles of substance given.... 2 moles C6H10O5. Please help I am lost!
June 17, 2015

Organic Chemistry
Which isomer of 1-ethyl-3-methylcyclohexane is more stable, cis or trans? My teacher hasn't covered this material as of yet, but we have a test done tomorrow on it. What is a cis and trans? Not sure how to begin figuring this out. My text book isn't helpful. Thanks
June 15, 2015

Organic Chemistry
Thank you Dr.Bob. For some reason my textbook doesn't have any answers to the selected problems so I don't know if I on the right track. I really appreciate your help.
June 14, 2015

Organic Chemistry
What is the hybridization of all the atoms (other than hydrogen) in each of the following species? a) NH3 e) +NH4 i) H3O+ b) BH3 f) +CH3 j)H2C=O c) -CH3 g) HCN d)*CH3 h) C(CH3)4 There are a couple I don't know how to do. Please help? Did I do the other correctly? Thanks. a...
June 14, 2015

Organic Chemistry
Is eutectic point and eutectic mixture the same thing? If not what is the difference between the two? Thanks in advance.
June 11, 2015

us gov
what single word means the same thing as representative democracy
June 10, 2015

Chemistry
analyze and describe the different types of genetic mutations and their effects
June 8, 2015

Math
Q. Tim and Jorge hope they will be assigned to the same cabin at the summer camp. Each cabin has 8 beds in it. And Tim knows that he is saying in the green cabin not the red cabin. If there are 14 boys going to camp in addition to Tim and Jorge. What is the change that Tim and...
May 28, 2015

Math
Thanks!
May 21, 2015

Math
Thanks!
May 21, 2015

Math
Q. Neil found out that the Sunday paper that he delivers is about 1 pound and 12 ounces. He delivers 39 newspapers on Sunday's. How much do the 39 newspapers weigh? (Hint: 16 ounces = 1 pound) A. I tried adding 16 12 times but that didn't work after I found out it was ...
May 21, 2015

Math
4:31
May 19, 2015

Math
Q. Juan delivers papers every morning before he goes to school. He has to have all the papers delivered by 6:30 am. He has 86 papers and he figures it takes him an average of one and one half minutes to deliver each paper. At what time must he start in order to be done as ...
May 19, 2015

Chemistry
A 10.0mL sample of H2SO4 was neutralized by 13.5mL of 1.0M KOH. What was its molarity of H2SO4? What is the normality?
May 18, 2015

Math
Thank you
May 14, 2015

Math
292-223=69
May 14, 2015

Math
Q. Mrs.Ramirez's class was getting ready to plant tomatoes. They we're wondering if each package of tomato seeds contained the same number of seeds. They counted the seeds in four packages and found that there was a average of 73 seeds in the package. The first three ...
May 14, 2015

Townview
Elaine is painting a fence. She knows that she needs 1 gallon of paint for each 10 feet of fencing. The fencing will enclose a rectangular yard that is 3 yards long and 2 yards wide. How much paint does Elaine need? (Remember 3 feet = 1 yard)
May 14, 2015

Chemisty
Dr. Bob, Where are you getting the 0.693 from?
May 14, 2015

Chemisty
The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?? a) 831hr b)521hr c)361 hr d)1.44hr
May 14, 2015

Math
Q. Mr. Kincaid's class wants to plant 1/4 (fraction) of its 12-foot-square plot with tomatoes. Of the remaining garden, 1/3 will be pears. Of the rest of the plot,1/2 will be radishes, and 1/2 will be lettuce. How many square feet of radishes will the class plant.?
May 13, 2015

Bio 20
Hydrogen sulfide gas is combusted with oxygen gas to produce sulfur dioxide gas and water vapour. If there is 19.3 L of oxygen gas, what maximum volume of hydrogen sulfide gas could be combusted?
May 11, 2015

Chemistry 20
Hydrogen cyanide gas is produced industrially by the reaction 2 CH4(g) + 3 O2(g) + 2 NH3(g) → 2 HCN(g) + 6 H2O(g) What volume of O2(g) is needed to completely react 17 L of CH4(g) at STP?
May 11, 2015

Chemisty
What is the molar solubility of AgCl, Ksp= 1.60x^-10, in a solution that also contains 0.0250 M KCl? The answer is 1.60x^-10. But I am not sure why this is. Does it have to do with the solubility rules? Please Help.
May 7, 2015

Medical science
Dimethyl ether = predominate weak dipole-dipole intermolecular force. (positively charged hydrogen atoms and the negatively charged oxygen atoms). H+ H+ H+- C- O - C - H+ H+ H+ Ethanol = hydrogen bonding (Hydrogen bonding to oxygen) H+ H+ H+ - C - C - O - H+ H+ H+ Hydrogen ...
April 29, 2015

Medical science
Dimethyl ether = predominate weak dipole-dipole intermolecular force. (positively charged hydrogen atoms and the negatively charged oxygen atoms). Ethanol = hydrogen bonding (Hydrogen bonding to oxygen) Hydrogen bonds have higher boiling points
April 29, 2015

chem
a solution is prepared with 3.26g kcl and water to make 25.0ml,of kcl,what is the %(m/V) of the kcl solution.
April 22, 2015

Molarity question
ahh thank you!
April 18, 2015

Molarity question
okay so in lab we made up 2 solutions of FeCl3 and KI. We varied the volumes...I was just wondering how to calculate a new concentration for those solutions. We weighed out .825g of the FeCl3 and 1.35 g of the KI. For trial one we used 20 mL of both. For trial 2 we used 20.0 ...
April 18, 2015

Chemistry: Potentiometric Anyalysis
Ok. Thank you. That is what I was thinking. I really appreciate your help.
April 14, 2015

Chemistry: Potentiometric Anyalysis
I am still working on a handful of the calculations.
April 14, 2015

Chemistry: Potentiometric Anyalysis
DrBob222, In the lab we used a NaOH solution with a 0.1088M to calculate the equivalence point of a unknown weak acid using "Logger Pro" program. I used 0.4530g of the unknown acid and dissolved it in 75ml of distilled water. For my 3 three trials, I gather enough ...
April 14, 2015

Chemistry: Potentiometric Anyalysis
If the pH probe was miscalibrated and reports the pH to be 1 unit higher than the true pH of the solution it is in, would the molar mass you report for the solid acid be higher, lower, or equal to the true molar mass of the acid? This for my post lab write up. I think that the...
April 14, 2015

Math
Perform the calculations 6 ft, 5 in,-2 ft, 7 in = what in ft, and inches Thanks
April 14, 2015

Math
Perform the following calculations 7 yds , 1ft -3 yds, 2 ft= what in ft Thanks
April 14, 2015

Math
A plane has a height of 1000 m. You see the plane at an angle of 40 degrees with the ground . How far away is the plane from where you are standing.
April 12, 2015

Math
A wall has dimensions 25 m by 10 m represent the wall with a drawing if the scale is 1 cm represents 5 m
April 12, 2015

Chemistry
0.688g of antacid was treated with 50.00ml of 0.200M HCl. The excess acid required 4.21 mL of 1.200 M NaOH for back-titration. What is the neutralizing power of this antacid expressed as mmol of HCl per gram of antacid? I think the answer should be: (50.00ml HCl)(0.200M HCl)= ...
April 6, 2015

physics
A car speeds up uniformly from rest so that it has a velocity of 30ms -1 after 20 second.How far does the car travel in first 10 seconds?
April 6, 2015

physics
A car speeds up uniformly from rest so that it has velocity of 30 ms-1 after 20 seconds. Question/ How far does the car travel in first 10 seconds?
April 6, 2015

physics
A car speeds up uniformly from rest so that it has a velocity of 30 ms-1 after 20 second. How far does the car travel in first 10 second?
April 6, 2015

Chemistry
The bubble in the tip of the buret is not removed prior to performing the NaOH standardization. Will the reported concentration of the NaOH be greater than, less than, or equal to the true concentration of the NaOH if the bubble is flushed from the buret during the titration? ...
April 4, 2015

Chemistry
am I doing this equation correctly, please help. K3PO4(aq) + Ba(NO3)2(aq) my answer: 3K(NO3)2(aq) + 2Ba(PO4)3(s) Double displacement precipitation
April 4, 2015

Chemistry
Why can't milk of magnesia (Mg(OH)2), act as a buffer?
April 2, 2015

Chemistry
A jar contains 75mL of a .45M silver nitrate solution. Will 200g of solid copper be enough to bring all the silver out of solution as a solid?
March 30, 2015

Chemistry
Thank you Dr. Bob222
March 30, 2015

Chemistry
Given that Ka for HIO is 3.2 × 10-11 at 25 °C, what is the value of Kb for IO– at 25 °C? Then, Given that Kb for C6H5NH2 is 1.7 × 10-9 at 25 °C, what is the value of Ka for C6H5NH3 at 25 °C? I don't know where to start? Do I need an ICE ...
March 30, 2015

Physical Science
A man loads 1,000 sacks of flour into a truck in 30 minutes. each sack has a mass of 20 kg and the man must lift each sack 1.00 m from a cart up onto the truck bed. How much power did the man develop?
March 30, 2015

Physics
A motorist is trying to loosen a stubborn lugnut by standing on the end of a wrench. The wrench is inclined 33.8 degrees above the horizontal and the distance from the center of the nut to the end of the wrench is 0.60 m. Assuming the motorist does not bounce up and down on ...
March 29, 2015

Chemistry
Great! Thank you. This helps a lot!
March 27, 2015

Chemistry
A buret is partially filled with NaOH solution, to a volume of 1.14mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret buret reading is 22.37mL. What is the molarity of the NaOH solution? Please help. Thank you in advance.
March 27, 2015

Math/Science
How do you convert millimeters to micrometers? For 10 mm, I got .010 micrometers, but I'm not sure if that's right.
March 25, 2015

algebra
what is the square root of 144?
March 23, 2015

English
Is the foghorn an archetype then ? I'm just really lost in this whole poem. Because archetypes are suppressed in the unconscious, so they talk about something they never intended is that what is meant ?
March 19, 2015

English
That is the idea that was proposed...I just don't understand the poem and its context in order to apply Jung's theory.
March 19, 2015

English
There is a deeper meaning to the poem and I am supposed to analyze the poem using Jung's theory of the psyche !
March 19, 2015

English
I need help with the following poem analysis, I do not know what it is saying! FOGHORN Surely that moan is not the thing That men thought they were making, when they Put it there, for their own necessities That throat does not call to anything human But to something men had ...
March 19, 2015

math
An arc AB of length 5cm is marked an a circle of radius 3cm. Find the area of the sector bounded by this arc and the radii from A and B.
March 15, 2015

math
A cord AB of length 4cm divides a circle of radius 3.3cm into two segments.find the area of each segment.
March 15, 2015

math
which pizza has the best value for the money; a 10 inch round pie for $6 or a 14 inch pie for $10? Support your answer.
March 14, 2015

math
6/(v-5)(v+2) if the rational expression is defined for all real numbers
March 9, 2015

math
Leslie needs 324 inches of fringe to put around the edge of a tablecloth. The fringe comes in lengths of 10 yards. If Leslie buys 1 package of fringe, how many feet of fringe will she have left over?
March 9, 2015

Math
A phone tree is used to let committee members know that a meeting is cancelled. The committee chair calls 5 people . Those 5 people each call 5 people and those additional people each call 5 people. How many members have been called?
March 6, 2015

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

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