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April 1, 2015

# Posts by m

Total # Posts: 1,027

Chemistry
World energy supplies are often measured in the unit of quadrillion British thermal units (10^12 btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81*10^17kJ. Current annual energy consumption in the United States is 99.3 quads. ...
October 7, 2012

english
Hot to unscramble rdntcioiya
October 2, 2012

Evolutionary Bio
What is Ghost of selection past?
October 1, 2012

Chemistry
What is the net ionic equation of reaction of MgCl2 with NaOH? I got the equation and then balanced it and then omitted the spectator ions and ended up with: Mg(OH)2(aq)--->Mg(OH) (s) I wanted to confirm to see if that was correct, thanks.
September 26, 2012

Chemistry
I was able to figure out that NaHCO3 was the limiting reagent. And then I got that there was .7596 grams of CO2 by converting the 1.45g of NaHCO3. I tried to use 1.45 NaHCO3 to figure it out but, I didn't get the right answer. My work: 1.45g NaHCO3(1mol NaHCO3/83.998g ...
September 16, 2012

Chemistry
The fizz produced when an Alka-Seltzer® tablet is dissolved in water is due to the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7): In a certain experiment 1.45g of sodium bicarbonate and 1.45g of citric acid are allowed to react. How many grams of ...
September 16, 2012

Chemistry
Octane has a density of 0.692 at 20degree C . How many grams of O2 are required to burn 17.0gal of C8H18 ? Step-by-step explanation much appreciated with as much detail as possible so I can understand. Thanks!
September 16, 2012

chemistry
How many moles of ammonium ions are in 8.794g of ammonium carbonate? I've tried this multiple times but some reason, I can't quite get the answer. If someone can show me step-by-step how to go about this problem, I'd really appreciate it.
September 16, 2012

Chemistry
A student found that her mixture was 15 percent NH4cl 20 percent NaCl and 75 percent Sio2 Assuming her calculations are correct what did she most likely do incorrectly in her experiment?
September 4, 2012

Chemistry
Given 1.7 g of hydrobromic acid (48%) calculate the number of mL. (MW HBr: 80.91 g/mol, density: 1.49 g/mL)
September 3, 2012

math
I didn't write the question- doesn't make much sense
August 27, 2012

math
A ball bounces back .06 of its height on every bounce. If a ballistic dropped from 200feet, how high does it bounce on the fifth bounce? Round to nearest tenth.
August 27, 2012

HEALTH
I know that A is wrong.
August 11, 2012

Physics
A 0.3 kg ball strikes a wall head on and then rebounds straight back. The initial speed was 10.0 m/s and the speed after it rebounds was 1.9 m/s. What was the magnitude of the total impulse on the ball during the collision in N*s?
July 9, 2012

Physics
Two objects A and B are involved in a totally elastic collision The mass of A is 8.8 kg and the mass of B is 0.5 kg. The velocity of A is 4.5 m/s and the velocity of B is 0 m/s. If they collide elastically, what will be the final velocity of A in m/s?
July 9, 2012

Physics
Two balls are involved in a completely inelastic collision. The first ball has a mass of 0.25 kg and an initial velocity of 9.27 m/s in the x-direction The second ball has a mass of 0.50 kg with an initial velocity of 2.61 m/s in the -x-direction. What is the speed of the two ...
July 9, 2012

Beginning Spanish-SraJMcGin
I am sorry I posted this a few moments ago with the wrong name attached at the top I apologize. I had these 2 questions that went with my earlier question. Lee cada situación a continuación y, según el contexto, indica si el se o nos significa each other o...
June 14, 2012

beginning spanish-SraJMcGin
I put at the end that I thought the answers to 1,2,3 were yes and 4 was no
June 14, 2012

beginning spanish
The assignment is to identify if "SE" or "NOS" is next to a REFLEXIVE verb/action (the subject(s) is(are) transmitting the action to himself (each other)) . Lee cada situación a continuación y, según el contexto, indica si el se o nos ...
June 14, 2012

Physics
An airplane flying at 82km/hr at 30 degrees east of north encounters a 40km/hr wind due west. What is the speed of the plane relative to the ground?
June 12, 2012

social studies
Which of the following hispanic countries has suffered an invasion by the U.S.? A) Spain, Argentina, Puerto Rico B) Cuba, Mexico, Nicaragua C) Ecuador, Peru, Colombia I think the answer is B am I correct?
June 1, 2012

physics
a body falls freely from rest
May 20, 2012

beginning spanish
I am to indicate the subject and object of each verb in the sentences. 1. no la quiere para nada. subject- la object- is none 2. lo ve todos los dias. subject- lo object- todos los dias 3. los obedece subject- los object- is none can you tell me if I am correct
May 16, 2012

Physics
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.63 V and a current of 2.7 A are induced in the coil. The wire is then re-formed into a single-turn square coil, which is used in the same ...
May 14, 2012

beginning spanish
the question is : que estudias? I am to respond that I am a history major. Am I correct to say Estudio historia
May 7, 2012

chem ll
Don't understand where to plug everything in.
April 30, 2012

spanish
te question is Ella se ____ Julia. We were to pick between llama, llamas, and nombre. I think the answer is llama but a little hesitant on that
April 22, 2012

Physics (Waves)
You have 27 tuning forks that oscillate at close but different frequencies. What are the (a) maximum and (b) minimum number of different beat frequencies you can produce by sounding the forks 2 at a time, depending on how the frequencies differ? *I KNOW HOW TO DO B, I GOT THAT...
April 20, 2012

science
My son had this assignment and it is totally confusing to me. This is the info provided: 4.5-V lightbulb and 3 batteries that are 1.5 V each Knowing Ohm's law: voltage (in volts) =current (in amps) x resistance (in ohms) or V=IR. Determine in which circuit the voltage was ...
April 17, 2012

physics
Just as a car tops a 51 meter high hill with a speed of 85 km/h it runs out of gas and coasts from there, without friction or drag. How high, to the nearest meter, will the car coast up the next hill?
April 14, 2012

Calculus
Given: available material= 1200cm^2 Box w/ square base & open top Find: Largest possible value of the box Can anyone give me a detailed, step-by-step explanation for this problem. I'm studying for an exam and have been working on this for awhile. The help would be very ...
April 10, 2012

CHemistry Question (pv=nrt)
How many liters of chlorine gas at 1.00 atm and 20ºC will be required to oxidize 167 grams of bromide ions to molecular bromine? A. 13.5 L B. 25.1 L C. 101 L D. 1.72 L E. 50.3 L
April 5, 2012

CHemistry Question
How many liters of chlorine gas at 1.00 atm and 20ºC will be required to oxidize 167 grams of bromide ions to molecular bromine? A. 13.5 L B. 25.1 L C. 101 L D. 1.72 L E. 50.3 L
April 5, 2012

Physics (Gravitation)
In Fig. 13-25, three particles are fixed in place. The mass of B is greater than the mass of C. Can a fourth particle (particle D) be placed somewhere so that the net gravitational force on particle A from particles B, C, and D is zero? If so, in which quadrant should it be ...
March 29, 2012

Chemistry Question
A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47 A D. 1.4 A E. 0.76 A
March 29, 2012

Chemistry Question (oxide acidity)
Which of the following oxides is the most acidic? A. Al2O3 B. P4O10 C. SO3 D. MgO E. SiO2
March 29, 2012

Chemistry Question (currents)
A 500-mL aqueous solution of NaCl was electrolyzed for 15.0 minutes, producing Cl2 gas at the anode. If the pH of the final solution was 12.15, calculate the average current used. (hint: what products are produced at the cathode?) A. 3.8 A B. 2.2 A C. 0.47 A D. 1.4 A E. 0.76 A
March 29, 2012

Chemistry Question (elements)
Indicate which of the following elements do not exist in nature in the elemental state (that is, they only exist in the combined state of being in compounds with other elements): Cl, K, S, Al, Ar, N A. S, Ar, N B. Ar only C. Cl, K, Al D. Cl only E. Cl, K
March 29, 2012

Chemistry Question
The reaction of quicklime (CaO) with sulfur dioxide (SO2) is an important reaction for reducing SO2 emissions from coal-fired power plants: CaO(s) + SO2(g) → CaSO3(s) This reaction is an example of: A. a precipitation reaction B. an electrolysis reaction C. a combustion ...
March 29, 2012

Physics Question (Tension)?
A solid object can be deformed in three fundamental ways. A roof is held up by support columns inside the building. The deformation of the column caused by the roof is A. Compression and Tension B. Shear C. Bulk
March 26, 2012

Statistics Question
For a test of Ho: p = 0.5, the z test statistic equals 1.52. Find the p-value for Ha: p > 0.5.
March 22, 2012

Physics
In 1980, over San Francisco Bay, a large yo-yo was released from a crane. Suppose the yo-yo was 153 kg, and it consisted of two uniform disks of radius 35.4 cm connected by an axle of radius 3.19 cm. What was the magnitude of the acceleration of the yo-yo during (a) its fall ...
March 17, 2012

Physics (Rolling)
In Fig. 11-35, a solid brass ball of mass m will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R, and the ball has radius r << R. (a) What is h if the ball is on the verge of leaving the track ...
March 16, 2012

Maths
find s given that v= 20, a= 10, u= 10 and v squared= u squared =2*a*s
March 5, 2012

Physics (Rotation)
In Fig. 10-28, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...
March 2, 2012

Chem Question (thermo)
Calculate ΔG at 25 ºC for a reaction in which Ca2+(aq) combines with CO32–(aq) to form a precipitate of CaCO3(s) if the concentrations of Ca2+(aq) and CO32–(aq) are 0.023 M and 0.13 M, respectively. (ΔGº = –47.94 kJ) A. –62.3 kJ/mol B...
March 1, 2012

Chem (Thermodynamics)
I got "B". Can anyone verify?
February 29, 2012

Chem (Thermodynamics)
The standard molar enthalpy of fusion and the standard molar enthalpy of vaporization of benzene are 10.9 kJ/mol and 31.0 kJ/mol, respectively. Calculate the standard molar entropy changes for the solid ↔ liquid and liquid ↔ vapor transitions for benzene. At 1 atm ...
February 29, 2012

Chem (electronegativity)
Calculate the E°cell for the following voltaic cell (use the standard electrode potentials given on page 829 of the textbook, or from some other source): Ni(s) + 2 Ag+(aq) → Ni2+(aq) + 2Ag(s) ====================== I got -0.55 as my answer. Ecell is Ecath-Eanod The ...
February 29, 2012

Chem (Thermodynamics)
Ok thanks!
February 29, 2012

Chem (Thermodynamics)
Ok for dHorxn I got 62.1kJ for dSorxn I got 132.7JK I did 62.1kJ x1000 to make it JK units too. So i got 0=62100-(T)(132.7) so T = 195degrees right?
February 29, 2012

Chem (Thermodynamics)
Calculate the temperature (in ºC) to which silver ore, Ag2O, must be heated to spontaneously decompose the ore to oxygen gas and solid silver metal at standard state. (ΔHºf of Ag2O(s) = –31.05 kJ/mol; Sº values: Ag(s), 42.55 J/mol•K; O2(g), 205.1 ...
February 29, 2012

Math
Explain in writting how to divide .12 by 8. (without using fractions) fifth grade
February 29, 2012

Chem (Thermodynamics)
Calculate the temperature (in ºC) to which silver ore, Ag2O, must be heated to spontaneously decompose the ore to oxygen gas and solid silver metal at standard state. (ΔHºf of Ag2O(s) = –31.05 kJ/mol; Sº values: Ag(s), 42.55 J/mol•K; O2(g), 205.1 ...
February 28, 2012

history
I have an assignment about the American Revolutionary War. I have to Select three major periods of the Revolutionary War to use as points of comparison showing how the war was experienced in the northern theater with how it was experienced in the southern theater during these ...
February 28, 2012

ELA
Write the unstressed syllable beside each word worship ship pilgrim grim repair re distance tance carrot rot entry try destroy des forbid bid hidden den dozen zen
February 27, 2012

chemestry
if 40 grams of water are produced when 30 grams of ethane is burned what is the % yields
February 14, 2012

Intermediate Algebra
The perimeter of a triangle is 48 centimeters. The longest side is 2 centimeters less than the longest side. Find the lengths of each side of the triangle.
February 14, 2012

Shurley English
How would you label sting in "Ouch, that bee sting hurts."
February 14, 2012

college algebra
By completing square, f(x) = 3[x^2 -2x - 7/3] = 3[x^2 - 2(x)(1) + (1)^2 - (1)^1 - 7/3] = 3[(x - 1)^2 - 1 - 7/3] = 3(x - 1)^2 - 3 - 7 = 3(x - 1)^2 - 10
January 17, 2012

English
when you get the answers, please put them here!
January 9, 2012

6th grade math-ms. sue
MS. Sue here is exactly what the paper says- think back to the experiment you just designed to test the Best Wheels Bike Shop's new super titanium wheel bearings. Can you be sure that your results are due to the new bearings and not something else? That depends on how you ...
January 9, 2012

My son has this homework and I am all confused... the paper says to think back to the experiment you just designed to test the Best Wheels Bike Shop's new super titanium wheel bearings. He did not do this experiment which leads me to believe this is just a statement for ...
January 9, 2012

government
I have to explain how American Association for Affirmative Action influences public policy. I still get confused on public policy but so far I believe the answer is this group influences public policy through affirmative action policies for women, minorities, etc. that ...
January 4, 2012

Physics
280 Pa
December 19, 2011

government
In my class I had to choose a major national issue and identify the forces in a political party that help drive the party to its position on the issue. I chose education and the Democratic party. The driving forces part is where I am stumped. I figured the forces would be ...
December 19, 2011

government MS. Sue please
Ms. Sue, Could you double check these, I asked you earlier and got the ball rolling. I had to choose five interests that are affecrted by public policy decisions. I chose No Child Left Behind, Health care insurance, environmental safety, veterans groups, and gun safety. What I...
November 30, 2011

government
I have to make a chart that shows five interests that are affected by public policy decisions. I am not 100% sure on this and did post earlier to which Ms. Sue graciously told me my 2 originals were ok. I have figured out these 5 but want to make sure they are interests that ...
November 30, 2011

government
I have to make a chart that shows five interests that are affected by public policy decisions. I am not 100% sure on this but could No Child Left Behind, and Environmental safety (like the oil spill that just happened in the gulf)?
November 29, 2011

A 130 kg astronaut (including space suit) acquires a speed of 2.80 m/s by pushing off with his legs from an 2000 kg space capsule. What is the change in speed of the space capsule? As the reference frame, use the position of the space capsule before the push. If the push lasts...
November 20, 2011

algebra
what does the a stand for in Pa^t what does the r stand for in Pe^rt how are they related?
November 6, 2011

english llit
I am still trying to figure out the meter in the poem On the Amtrak from Boston to New York City. Looking at the types of meter I narrowed it down to iambic pentameter and anapestic. I thought the meter was anapestic because of the 2 unaccented syllables followe by 1 accented ...
November 6, 2011

english lit
I am writing a paper on "On the Amtrak from boston to new york city" by sherman alexie. I need to detail how the poet used literary conventions and poetic devices such as meter, imagery, and symbolism to communicate the meaning of the poem. I have the imagery and ...
November 6, 2011

Chemistry
Kate's (a) and (b) are correct, but (c) is incorrect. 6.00 M NaOH = (0.325 mol NaOH) / (mL NaOH) mL NaOH = (0.325 mol NaOH) / (6.00 M NaOH) With correct significant figures, the answer to (c) is 54.2 mL.
October 31, 2011

bio270
a. downward deflection b. upward deflection c. no deflection d. up then down deflections e. down then up deflections
October 16, 2011

bio270
In an electrocardiograph a wave of sustained depolarization moving towards a negative electrode will produce:
October 16, 2011

physics
Average destance between Earth and the moon is 384 790 km. How many days would it take sound to travel to the moon?
October 12, 2011

physics
Vibration of the dishwasher causes standing waves in a cup. crests form four concentric rings and the diameter of teh cup is 6.0cm v=1.5m/x . What is teh frequency of the vibrations?
October 12, 2011

math
Keno is a casino game in which the player has a card with the numbers 1 through 80 on it. The player selects a set of k numbers from the card, where k can range from one to fifteen. The "caller" announces twenty winning numbers, chosen at random from the eighty. the ...
October 9, 2011

math
My son is doing this in 6th grade math class. Mr. Weiss started painting the kitchen at 8:45 am and finished painting at 12:00 pm. About how many hours elapsed between the time he started painting and the time he finished painting the kitchen? Answers are 2h, 3h, 4h, and 5h. ...
October 6, 2011

history
I am helping my son who is in the 6th grade. He has a crossword puzzle that relates to early civilization and the clue is different. We have this much so far ???e??? for a total of 7 letters with an e in the middle please help.
October 5, 2011

physics
+ 8 going with wind - 4 against the wind -4+8/2 = 2 is the average speed
October 2, 2011

Chemistry
Thank you so much drbob! Your explanation make sense! :D
September 29, 2011

precalc
find two functions f and g such that (f+g)(x) = 5 and domain of f + g is [0, infinity)
September 27, 2011

math
use intermediate value theorem to show f(x) has a zero f(x)= x^5 - 4x^4- 7x^2 - 6x; [-0.7, -0.6]
September 25, 2011

math
use intermediate value theorem to show f(x) has a zero f(x)= x^5 - 4x^4- 7x^2 - 6x; [-0.7, -0.6]
September 25, 2011

pre calculus
given points (0,0) (0,5) vertical asymptote of (-1,1) and horiz (2,1) how do I find the equation??????
September 22, 2011

pre calculus
solve in real number system x^3 + 5x^2 - 12x = 14 =0
September 22, 2011

pre calculus
find the bounds on the real zeros????? f(x) = x^5 - 5x^4 +8x + 2
September 22, 2011

Calculus
use the intermediate value theorem to determine whether there is a zero f(x) = -3^3 - 6x^2 + 10x + 9 ; [-1,0]
September 22, 2011

precalc
convert into equation with 0 on right hand side sq route (x+6) = 6-2 sq route (5-x)
September 13, 2011

chemistry
S2(s)+H2(g)=H2S(g)
September 12, 2011

algebra 2
i need help solving these inequalities i'm not sure if i should factor things out or not 4x^3 is greater than or equal to 16x and 4 is greater than or equal to 2x^3 + 8x
September 8, 2011

Physics
99.48 km/h
September 5, 2011

the answer is 1232 as two of the digits should be same also
August 30, 2011

Chemistry
oh ok thanks i got .09 i hope thats right
August 23, 2011

Chemistry
The question said to use dimensional analysis...
August 23, 2011

Chemistry
(0.75 moles Al(NO3)3/L Al(NO3)3) x 0.040 L Al(NO3)3 = ??moles Al(NO3)3 I am unsure how to find the factor to convert moles Al(NO3)3 into moles NO3. i think that if i do the first section, you get .03 moles as your answer for moles of Al(NO3)3, but I am not sure. how can i ...
August 23, 2011

chemistry
use dimensional analysis to find how many moles of nitrate ions are in 40.0 mL of a 0.75 M aqueous solution of aluminum nitrate
August 22, 2011

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