Tuesday
December 6, 2016

Posts by Student

Total # Posts: 850

Chemistry
I am trying to answer the question below, and I am guessing the reason lactate has a lower Km is that it is better able to accept electrons than ethanol. Is this correct? If so, what makes lactate a better electron acceptor? Any help is greatly appreciated! "ethanol is a ...
November 27, 2016

Physics
Two spherical objects have masses of 3.5 x 10^7 kg and 6.5 x 10^9 kg. Their centers are seperated by a distance of 125000 m. Find the gravitational attraction between them.
November 21, 2016

Biochemistry
The kinetic parameters of the reaction of lactate to pyruvate can be measured by following the formation of NADH from NAD+. It can also be measured in the reverse direction, however, at high concentrations of NADH the reaction cannot be monitored at 340 nm? Why is this? I'...
November 20, 2016

Biochemistry
Because ethanol is a poor substrate for LDH, shouldn't it have a lower Km than lactate? (Because Km is binding affinity) Also, how do the structure of active sites (for example, in this case lactate and ethanol) influence Km? THANK YOU SO MUCH!
November 20, 2016

english
I need help in writing a detailed paragraph contrasting these two stories "Gumption" and "To build a fire" and how their structures influence meaning.
November 19, 2016

geometry
Create a wrapping paper design that includes at least four of the following constructions: a bisected angle a perpendicular line drawn from a point not on a line to a line a perpendicular line drawn through a given point on a given line a quadrilateral with at least one pair ...
November 14, 2016

Biochemistry
How does acetyl coA get out of the mitomatrix and into the cytoplasm? If you could explain this process, or reference me to a good picture or graphic of this process I would greatly appreciate it! Thank you so much for your help!
November 12, 2016

Composition of Functions
1. Find (f·g)(x) where f(x) = 1/x²+3 and g(x) = ?x-2. a) (f·g)(x) = 1/x-2 b) (f·g)(x) = 1/?x-2 +3 c) (f·g)(x) = ?-2x²-5/x²+3 2. Find (g·f)(x) where f(x) = x²-2 and g(x) = 5x-8. a) (g·f)(x) = 5x²-18 b) (g·...
November 9, 2016

functions
Safi is traveling to London, England. he's going to have two layovers on his trip. in total, he's going to spend 17 hours on a plane. if he doesn't want to spend any more than 21 hours in total traveling, how long can each layover be, assuming they're the same ...
November 8, 2016

Physics
Determine the radius R of an object undergoing circular motion at a velocity of 54 m/s with an acceleration of 90 m/s^2
November 7, 2016

Physics
Calculate the velocity of an object moving around a 32m circle in a period of 11s. Calculate the acceleration.
November 7, 2016

American Government
3 is B
November 7, 2016

Chemistry
Thank you for your help!!
November 6, 2016

Chemistry
You have isolated compound X from panda pancreas. You started with a whole pancreas, and finished up with 5 ml of a pure solution of X. Assume you got 100% recovery of compound X. You take 300 µl of this solution, and add it to 1.7 ml of buffer. The absorbance of this ...
November 6, 2016

social study's
The introduction of maize most likely contributed to which major Native American cultural shift? A) the creation of large earthworks B) the gradual end of the nomadic lifestyle C) the growth of the hunter-gatherer culture D) the depletion of large game such as buffalo
October 25, 2016

GCF
adding and subtraction number using greatest common factors 940-420=? 169-26=? 15+75-45=? 48+16=? 17+51=? What is the GCF?
October 20, 2016

Math
adding and subtraction number using greatest common factors 940-420=? 169-26=? 15+75-45=? 48+16=? 17+51=? What is the GCF?
October 20, 2016

Math
adding and subtraction number using greatest common factors 940-420=? What is the GCF?
October 20, 2016

Math
adding and subtraction number using greatest common factors 121-22=? What is GCF of this problem?
October 20, 2016

Social Studies
Why did Congress feel the need to boost American morale by releasing this address in early 1778? A. American army had given up an d and began to side with the British. B. Americans were beginning to lose hope of winning their independence. C. Congress used the address as a way...
October 20, 2016

Social Studies
12. Which of the following excerpts is a grievance of the American colonists that was included in Declaration of Independence?
October 20, 2016

Social Studies
C?
October 20, 2016

Social Studies
9. Which of the following statements comparing the Continental and British armies is most accurate? A. The British had more troops and were better disciplined than the Americans. B. The British had limited access to supplies while the American supplies were plentiful. C. The ...
October 20, 2016

Social Studies
7. What was the impact of the Olive Branch Petition?
October 20, 2016

Social Studies HELP
Thank you
October 19, 2016

Social Studies HELP
4. How does Abigail Adams use the ideas of the patriots to support her cause?
October 19, 2016

geometry
sketch LM on paper. Construct a line segment to LM. Then construct the perpendicular bisector of a line segment
October 14, 2016

English
Is the below sentence in Third person? This reference will be used in the prevention and education section of the paper.
October 10, 2016

math
1.Which ordered pair is the solution to y = 2x + 10? a(2, 2) b.(3, -4) c.(-3, 4) d.(1, 6)
October 7, 2016

MATH HELP
1.Which ordered pair is the solution to y = 2x + 10? a(2, 2) b.(3, -4) c.(-3, 4) d.(1, 6) 2.Solve the following equation: m – 8 = -14 a.m = -6 b.m = 7 c.m = 26 d.m = -4 Solve the following equation: 4/7 x = -16 A)x = 42 B)x = -28 C)x = 23 D)x = -24 Solve the following ...
October 6, 2016

Physics
An object is shot upwards, from the ground, with an initial velocity of 120 m/s. How high will it be after 4.0s?
October 5, 2016

Physics
An object, initially at rest, is subject to an acceleration if 34 m/s^2. how long will it take for that object to travel 3400m
October 5, 2016

PLEASE HELP HISTORY
In what way was the government of ancient Athens different from the united states A) Athens was a direct democracy in which citizens B) Athens was an oligarchy ruled by the wealthy members of the council of five hundred C) Athens was a republic in which the people voted for ...
October 5, 2016

Anatomy and Phys
what is the difference between heartburn and dyspepsia?
October 1, 2016

Physics
A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released? Please help me solve this!!
September 25, 2016

History
Explain how scientists use evidence to interpret history Explain the features of early civilizations Identify the effects of Neolithic Revolution on humanity thanks in advance
September 21, 2016

World History
Explain how scientists use evidence to interpret history Explain the features of early civilizations Identify the effects of the Neolithic Revolution on humanity
September 20, 2016

Geometry
E = hc/y , solve for the variable h
September 18, 2016

Inorganic Chemistry
How comes no answer for this????
September 16, 2016

Physics
How far does a runner travel if they maintain a speed of 8.5 m/s for 240 s?
September 8, 2016

Physics
During the first 50 s a truck traveled at constant speed of 25 m/s. Find the distance that it traveled.
September 8, 2016

Physics
A rabbit can cover a distance of 80 m in 5 s. What is the speed of the rabbit?
September 8, 2016

Language Arts (Books)
How does the writer use Elphaba to convey a message or a lesson in the book Wicked?
September 5, 2016

Social Studies (Check Answers)
Awesome sauce
August 25, 2016

PICOT Question
I would like to to research on Concussions in College Football Players but am having trouble trying to use the PICOT to formulate a question. This is what I have so far: In college football athletes with concussions does current treatments and management compared to past ...
July 18, 2016

Math
a man can swim with a speed of 4 km per hr in still water. How long does he take to cross a river 1 km wide if the river flows steadily at 3 km per hr and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank? Ans: ...
June 30, 2016

Algebra
Find K given y=200 when x=300
June 13, 2016

Algebra
Write the equation of the line in slope intercept form; passing through (3,11) with slope 7/3
June 9, 2016

Algebra
A is the point (4,-3) and b is (-1,1). Find the gradient of a line perpendicular to AB. Plz help!!!!
May 24, 2016

Algebra
Thank you John
May 24, 2016

Algebra
Write the gradient of the line perpendicular to the line with gradient. (a) 5 , (b) 7 , (c) -4 , (d) -9 , (e) 1/2 , (f) -3/4 , (g) 3/8 , (h) -2/3
May 24, 2016

Chemistry
How to convert 4.6-10.5 micrograms/dL to nmol/L? The answer is 59-135 nmol/L, but I have no idea how to set it up to get that answer.
May 22, 2016

Math
Match the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.
May 18, 2016

Math
Match/Choose the math sentences that count up and back by tens. 47+40=88 57+30=87 46+10=56 56-10=46 87-40=47 87-30=57 Write the matching math sentences.
May 18, 2016

science
How does the law of conservation of matter apply to mixtures? The law of conservation of matter is a law that states matter cannot be created or destroyed. But how does that affect mixtures HELPPPPP
May 3, 2016

English
What are the elements of the literary genres of suspense and horror? How is foreshadowing used to create suspense? What is an unreliable narrator? What are the characteristics of a stock character? What is the purpose of poetic devices such as assonance, consonance, and ...
April 14, 2016

LOGARITHM
Ln(2x-1)^2=7 solve for x. Please check my answer!!! =17.0577259793 Is this number too big?
April 9, 2016

Logarithm
Please check!!! =17.0577259793 Is this number too big?
April 9, 2016

Logarithm
Ln(2x-1)^2=7 solve for x. Really confused
April 9, 2016

Logarithm
Solve for x
April 9, 2016

Logarithm
Ln2+Lnx=1
April 9, 2016

Math
Thank you
April 9, 2016

Math
2e^3x=16 Solve for x. So far I changed this to 2ln3x=16 then ln3x=8 then...
April 9, 2016

Math, science
in 2009 an earthquake of magnitude 6.7 shook the kermadec islands off the coast of new zealand. also in 2009 an earthquake of magnitude 5.1 occured in the alaska peninsula. How many times stronger was the kermadec earthquake. Use formula log (I1/I2)=m1-m2 A.39.811 B.20.593 C.5...
April 9, 2016

Algebra 2
Thanks
April 9, 2016

Algebra 2
I am confused about his question. I 3000 times.04 times 10 and added that to 3000 to get 4200 but its not an option QUESTION::suppose you deposit $3000 in a savings account that pays interest in a a rate of 4%. if no money is added or withdrawn from the account, how much will ...
April 9, 2016

Art
The right answer is The figures of various community members :(
March 30, 2016

maths,agricultur;life science,business
Why are you asking this? Only you know what Sciences interest you; not us...
March 16, 2016

Chemistry-DrBob222
A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My answers: P argon = 0....
March 11, 2016

Chemistry-DrBob222
I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the ...
March 11, 2016

Art Please Ms.Sue
Which two cultures use creatures to protect or transport humans after death? America (bald eagle) and Spain (bull) Egypt (the animal-headed sons of Horus) and China (the dragon)***** Egypt (the jackal) and China (the lion) Mayans (the crow) and Greeks (the raven) What symbol ...
March 11, 2016

Chemistry
Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T = ...
March 11, 2016

Art Please Ms.Sue Help
Thank you your awesome. Ms.sue
March 11, 2016

Art Please Ms.Sue Help
1.How do landscape paintings convey the values and ideas of Chinese culture? A.Landscape paintings show chaotic, unhappy culture. B.Landscape paintings reveal the importance of natural history to the Chinese. C.Landscape paintings show that Chinese desire to live in simple ...
March 11, 2016

Chemistry
A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...
March 11, 2016

Chemistry- DrBob222
Please check. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and ...
March 11, 2016

Chemistry
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 9 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
March 10, 2016

Chemistry
If I was designing an experiment where hydrogen gas was collected over a 0.1 M aqueous HCl solution from the reaction with zinc metal and I assume complete, rapid reaction, what mass of zinc would be used to collect between 50 and 100 mL of the gas? Note: I calculated using ...
March 9, 2016

Chemistry
What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the following balanced chemical equation? HA <----> H+ + A-
March 8, 2016

Chemistry-DrBob222
A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 degrees C. What is the (molar) heat of ...
March 8, 2016

Chemistry-DrBob222
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
March 8, 2016

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
March 8, 2016

Chemistry
Two gases are mixed in a 10.0L fixed volume flask: 8.0 L of O2 at 2.00 atm and 2.0 L of N2 at 3.00 atm. A) Calculate the partial pressure for each gas and the total pressure. I got ... PO2 = 1.60 atm PN2= 0.600 atm B) How much (volume in liters) argon at 5.0 atm must be added ...
March 8, 2016

Chemistry
A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3 g/mol) with 50.0 mL of 1.0...
March 8, 2016

Chemsistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
March 7, 2016

Chemistry
Write a balanced chemical equation for this: The RXN of hydronium ion with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions.
March 7, 2016

8th grade language arts
Has anyone deemed these answers correct? Found them useful?
March 5, 2016

8th grade language arts
Has anyone deemed these answers correct? Found them useful?
March 5, 2016

Chemistry- Dr.Bob
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? The explanation from bobpursly was this The sum of heats gained =0 80(cice)(0+15)+80Hf+80cw(...
March 1, 2016

Chemistry-Dr.Bob 222
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I still don't understand how to do this.
March 1, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up. The setup is like this (answered by bobpursly): The sum of...
February 29, 2016

Chemistry
CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...
February 29, 2016

Chemistry
CH4 (g)+ H2O (g) --->/<---- 3H2 + CO Use Le Chateliers Principle to explain what will happen to the number of moles of hydrogen at equilibrium when a) CO is removed b) Water Vapor is removed c) Methane is added d) CO is added e) Pressure is increased by adding argon gas...
February 29, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up that I have to set the equation equal to 0 ...
February 29, 2016

Chemistry
I got 1.11 x 10^-6 for K. Here is my work: x= 0.004 -2x= -0.008 (change for CH4) Equilibrium for CH4 is 0.087 - 0.008= 0.079 Change in eq for C2H2 is 0.004 and eq is 0.004 (=x) Change in eq for H2 is 0.012 Eq for H2 is 0.012 K= [C2H2][H2]^3/[CH4]^2 K= (0.004)(0.012)^3/(0.079)^...
February 29, 2016

Chemistry
The reaction of CH4 in 2CH4(g) ---->/<---- C2H2(g) + 3 H2 (g) is carried out at a different temperature with an initial concentration of [CH4]=0.087M. At equilibrium, the concentration of H2 is 0.012 M. Find the equilibrium constant at this temperature.
February 28, 2016

Math
C is incorrect- not 30,000
February 25, 2016

Chemistry
how does one go about finding the Tf of this equation 100Hf+100cw(Tf-0) + 300w(Tf-25) =0 and can you also explain what cw and Hf mean? i have no idea.
February 24, 2016

Chemistry
What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is Tf= 109 C? Is it in the steam phase?
February 24, 2016

Chemistry
A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?
February 22, 2016

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