Saturday
April 19, 2014

Posts by b


Total # Posts: 251

Chem.
At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

English IV
Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb & got it wrong)

Chemistry:Important!!!!!!!
Thank you! I was just missing the step of multiplying by atomic mass! :)

Chemistry:Important!!!!!!!
A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

engineering
No idea. But i want to know. Does anyone have an idea??

Finance
The spot exchange rate for the Canadian dollar is Can $1.14 and the six-month forward rate is Can $1.17. Calculate whether a U.S. dollar or a Canadian dollar is worth more.

chemistry
Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

chemistry
Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O

chemistry
Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is: 2NaOH + Al + 6H2O  2NaAl(OH)4 + 3H2 (note: balance the reaction first) What mass of A...

algebra 2
3x+3y

mahs
(2a+8b)

chemistry
What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2

chemistry
What mass of ammonia is produced when 1.48 L of nitrogen (at STP) react completely in the following equation? N2 + 3H2 --> 2NH3

BioChem
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 2.50 × 102 mm...

Biochem
In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that contains 2.50 × 102 mm...

Stats
The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task...

fractions
a recipe calls for 1/4 teaspoon of salt. to make three times the amount how much salt is needed?

chemistry
density = mass/volume mass = 6.4 grams volume = 28.61 mL - 27.80 mL = 0.81 mL density = 6.4 grams/0.81 mL density of Fe = 7.9 g/mL

Precalculus
Thank you!! I combined the terms when I isolated the LCD and received the following: a^2 +5a - 2a - 10 = 3a^2 + 15a etc..until I received: 2a^2 + 12a + 10 = 0 I wasn't sure what step to complete in order to obtain -5/2 as my final answer.

Precalculus
Is a+5 the proper LCD to isolate from the equation in order to obtain -5/2?

Precalculus
Solve for a. a/a+5 - 2 = 3a/a+5

Pre-Calculus
How to write this conic section in standard form? 3y^2 = 108 - 12x^2

Pre-Calculus
How to write this conic section in standard form? 3y^2 = 108 - 12x^2

Physics
its a mystery

chem
a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?

math
use r=3/2, nowhere does it say r is an integer. 64,96,144,216,324,486

physics
23.4444444444444444

math
The buying and selling commission schedule shown below is from a well-known online discount brokerage firm.? Taking into consideration the buying and selling commissions in the schedule find annual rate of interest earned by each investment? Transaction Size Commission Rate $0...

Physics
Tut tut, your supposed to do your own MIT exam questions, not ask other to do them for you.

Chemistry
Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

Chemistry
Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

Chemistry
Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

social studies
How can you remember facts about the revolutionary war

Chemistry
How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

Chem
(Sp Heat)(Change in Temp)(Mass)=

Chemistry
The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

Chemistry
How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

Legal aspects of health Information management
Im wondering, too!

Chemistry
What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1=5.6x10^-2 and Ka2=5.1x10^-5

Chemistry
What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11

PHYSICS
A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?

math
A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.

Cosmology
The abundance of irregular galaxies across clusters

bioelectricity
Let Pk, Pna and Pcl be permeabilities of squid axon membrane for potassium, sodium and chloride, respectively. During the rest, the ratios of permeabilities are given by Pk:Pna:Pcl = 1.0 : 0.043 : 0.44 During the peak of an action potential these ratios become Pk:Pna:Pcl = 1.0...

bioelectricity
Cl equil-v: Only chloride may cross a membrane separating two compartments. At a temperature of 26∘C, the concentrations of chloride ions are: intracellular: 70 extracellular: 485 What is the equilibrium potential? Give a numeric answer within 1%, in mV.

Bioelectricity
K equil-v: Only potassium may cross a membrane separating two compartments. At a temperature of 30∘C, the concentrations of potassium ions are: intracellular: 280 extracellular: 110 What is the equilibrium potential? Give a numeric answer within 1%, in mV.

Bioelectricity
Na equil-v: Only sodium may cross a membrane separating two compartments. At a temperature of 28∘C, the concentrations of sodium ions are: intracellular: 100 extracellular: 485 What is the equilibrium potential? Give a numeric answer within 1%, in mV.

bioelectricity
At a temperature of 10∘C, the concentrations of ions are: IonIntracellularExtracellular Na61485 K28010 Cl51485 The transmembrane potential is -30 mV. How many ion species (Na, K, or Cl) are NOT in equilibrium?

bioelectricity
Assume that frog muscle cell membrane is permeable to Na and K only. The membrane permeabilities for Na and K are Pna and Pk respectively. At 16∘C, the resting membrane is -91 mV. What is the ratio of permeabilities Pna/Pk? For frog muscle, intracellular and extracellula...

math
Ryan estimates that he uses 2/3 cup of syrup each time he eats pancakes. How many times will he be able to eat pancakes without running out of syrup if he has a giant bottle of syrup that contains 48 cups. Do you multiply 48x2/3 and get that he will be able to eat 32 pancakes?

Physics
A mountain-climbing expedition establishes two intermediate camps, labeled A and B in the drawing, above the base camp. What is the magnitude Δr of the displacement between camp A and camp B?

Chem
how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask

Grammar
Need thesis stAtement for persuasive research paper on cs lewis

Physics
Car A is traveling at 18 m/s and car B at 25 m/s. Car A is 300m behind car B when the driver of Car A accelerates his car with an acceleration of 1.80m/s^2. How long does it take car A to overtake car B?

math
List order of numbers from least to greatest is the following correct? 1 3/7 1 2/4 1 8/14 1 3/4

physics
If the hockey puck lies on the ice and is struck by a hockey stick with a force of 2.60e+03 N, what is the acceleration of the hockey puck

HISTORY HELP ME
oh thats cool way to show feelings

HISTORY HELP ME
i think it d

HISTORY HELP ME
28. Which answer best describes how some enslaved African Americans expressed their emotions? (4 points) They didn’t believe in public emotional displays, so they would often express themselves only to the tribal chief. They participated in sports like archery and lacross...

math
Estimate each quotient 535.6/35?

Physics
A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.

Physics
An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?

Chemistry
(a)What is the bond order of the diatomic molecule BN? (b) Is BN paramagnetic? (c) Rank the following compounds in order of increasing bond energy: B2, N2, BN. (d) Rank the following compounds in order of increasing bond length: B2, N2, BN.

Science
Jiskha is not part of the MITx platform!!! How the honor code of MITx could be applied to an user of other system?

Chemistry
Rb<Se<Cl

Chemistry
right!!!

Chemistry
right!!!

Chemistry :'(
right!!!

Chemistry :(
(Kg og Na)/ 23*4 =X X * 47.88 = in g convert to Kg

Chemistry
-430.5

chemistry
equation?

chemistry
-430.5

chemistry
equation please

math
what is 14.76 rounded to the nearest hundredth?

science
-430.5

physics
blocks 1 and 2 of masses 2 kg and 4kg, respectively, are connected by a light string, as shown above. These blocks are further connected to a block of mass 3kg by another light string that passes overr a pully of negligible mass and friction. Blocks 1 and 2 move with a constan...

Physics
At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of 92 N at an angle of 30 as shown in the figure below. The box of books has a mass of 22.0 kg, and the coefficient of kinetic friction between the bot...

Chemistry
If the theoretical yield of a reaction is 18.6 grams & 7.6 grams were collected the.experiment, what is the percent yield

grammar
I expect a friend to be both honest and a loyal person.

english
What, does that mean that the answer is D neither?

english
What is on batteries in the following sentence: These clocks often run on batteries. A. Main verb B. Helping verb C. Both D. Neither Is it D Thanks

English
What is can find in the following sentence: You can find properties of science in a basic clock. A. Main verb B. Helping verb C. Both D. Neither I say it is C Both, is this right?

physics
Consider the Earth and a cloud layer 600 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 2.0 km2 = 2000000 m2, what is the capacitance?

english
Is the answer C?

english
Answer the following ____ stories seemed unbelievable. A. Survivors B. Survivor's C. Survivors' D. Survivors's

English
What is the answer to the following: Money might be sewn into ___ coat A. women's B. woman's C. womens' D. womans'

english
What is the answer to the following: Many ____ stomachs were often empty. A refugees B refugee's C refugees' D refugees's

ap
It's 4, not 3

ap
786.6g

Physics
A 350 N child is in a swing that is attached to a 7.50 m long rope. find the gravitational potential energy associated with the child relative to her lowest position when a) the ropes are horizontal, (b) the ropes make a 30 degree angle with the vertical, and (c) the child is ...

Physics
Suppose you have 100 g of radioactive plutonium-239 with a half-life of 24,000 years. How many grams will remain after (a) 12,000 years (b) 24,000 years (c) 96,000 years?

Physics
Suppose you have 100 g of radioactive plutonium-239 with a half-life of 24,000 years. How many grams will remain after (a) 12,000 years (b) 24,000 years (c) 96,000 years?

Sociology
What is a bipolar racial classification system? Thanks!

physics
Esteemed professor I hope to resolve the issue as soon as possible and thank you Amotorcycle slowed down to rest from avelocity of 10m\sec whiletraveling 30m what is its average acceleration

physics
Amotorcycle slowed down to rest from avelocity of 10m\sec whiletraveling 30m what is its average acceleration

Chemistry
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

Information Systems in Organizations
a b c d

chemistry
a 35.5 mL sample of an NaOH solution is needed to titrate a 2.08 g sample of pure benzoic acid (HC7H5O2)a solid. What is the molarity of the NaOH solution?

chemistry
A .500 g sample of impure CaO (a solid) is added to 50.0 mL of 0.100 M HCl. The excess HCl is titrated by 5.00 mL of .125 M NaOH. What is the percentage of CaO in the sample?

English
B"

Pages: 1 | 2 | 3 | Next>>

Search
Members