Cristian

Most popular questions and responses by Cristian
1. Chemistry

How much 5M KOH must be added to 1.0 L of 0.1M glycine (pKa 9.6) at pH 9.0 to bring its pH to exactly 10.0?

asked on February 27, 2013
2. Math

In the following figure , triangle abc and triangle DEF are similar. What is the value of x You would know if u go to connections Academy

asked on March 12, 2019
3. physics

When two objects move uniformly toward each other, they get 3.0 m closer each second, and when they move uniformly in the same direction with their original speeds, they get 1.0 m closer each 17 seconds. What is the speed (in meters/second) of the faster

asked on February 21, 2013
4. Chemistry

N2O5 + H2O ---> 2HNO3 The reaction is first order in each reactant. Write the rate law for the reaction my guess rate= k[N2O5]^1[H2O]^1

asked on December 11, 2012
5. math

Keisha invested her savings in two investment funds. The \$4000 that she invested in Fund A returned a 10% profit. The amount that she invested in Fund B returned a 3% profit. How much did she invest in Fund B, if both funds together returned a 7% profit?

asked on December 9, 2015
6. Physics

A figure shows a section of a long tube that narrows near its open end to a diameter of 1.0 mm. Water at 20 degrees celsius flows out of the open end at 0.020 L/s. What is the gauge pressure at point P, where the diameter is 4.0 mm?

asked on November 27, 2012
7. 9th grade physics

A sled of mass 50 kg is pulled along a snow-covered, flat surface with a force of 200 N. the friction force acting on the sled is 49 N. what is the acceleration?

asked on November 17, 2010
8. Algebra NEED HELP ASAP!!!!!!

The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon? (write the equation as a

asked on November 20, 2013
9. Chemistry

how would you prepare 500 ml of .2M solution starting with solid NaH2PO4*H20?

asked on September 26, 2012
10. Biology

When making comparison of sequences where some are whole genome sequences while others are partial genome sequences, or a specific glycoprotein sequence, How is it that we are able to make comparisons from these sequences if they all have different

asked on April 21, 2013
11. Algebra 1

The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon? (also write an equation)

asked on November 20, 2013
12. biology

is trypsin inhibitor competitive or noncompetitive

asked on October 12, 2013
13. college chemistry

In the derivation of this expression: [ln]/[HIn]A# 2 * A#1,acid/A# 2,basic * A#1 We assumed that the HIn form of the indicator is the only form present in the most acidic solution. Is this a valid assumption? Why or why not? Support your answer by

asked on October 1, 2012
14. Chemistry

a 110 g solid sample that is a mixture of CaCO3 and CaCl2 is reacted with 1.50 L of 1.45M HCl. Of the calcium salts, only calcium carbonate reacts with HCl- the reaction forms CaCl2 and CO2. The excess/unreacted HCl requires 0.850 L of 0.543 M NaOH to

asked on December 3, 2012
15. Algebra 1

The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon? (write the equation as a

asked on November 20, 2013
16. Algebra 1

The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What are the independent variable and dependent variable

asked on November 20, 2013
17. Cell Biology

Suppose 1.00 ml of blood from a given donor contained 5 X 106 red blood cells and the donor’s hematocrit were 48%. Determine the surface area that the lipids extracted from the plasma membranes of red blood cells obtained from 10.0 ml blood would occupy

asked on September 21, 2013
18. Physics

A rock is dropped from a height of 100 meters above the ground. One second later, a ball is thrown vertically downwards, from the same height, with an initial speed of 13 m/s. How long after the ball is thrown will the two objects be at the same location

asked on February 27, 2013
19. Chemistry

What determines whether or not the majority of acid is in the protonated form in solution? How does this incorporate both the pH of the solution and the pka of the acid?

asked on October 30, 2012
20. geometry

i need example of isometric drawing

asked on September 2, 2010
21. Physics

Jogger A, with a mass of 55kg, is traveling 6.00m at 3.45 m/s in the positive x-direction. Jogger B, with a mass of 62kg, is traveling 3.00m at 4.23 m/s in the positive x-direction. Jogger C, with a mass of 72kg, is traveling 5.00m in the negative

asked on September 28, 2015
22. Statistics

True or False: For ANOVA you will reject the null hypothesis is the variability within a sample is greater than the variability among samples?

asked on December 15, 2013
23. Chemistry

How would you determine the concentration of H+, H2A and MB+ in a solution containing volumes of: H+ 600 microliters H2A 500 microliters MB+ 100 microliters H20 800 microliters

asked on November 18, 2012
24. Chemistry

Which of the following will buffer near pH=9? a. 0.5M sodiumacetate/0.5M acetic acid b. 0.5M ammonium chloride/0.5M ammonia c. 0.5M sodium dihydrogen phosphate/0.5M hydrogen phosphate i think a) 0.5M sodiumacetate/0.5M acetic acid will buffer near pH=9

asked on October 17, 2012
25. Algebra (math)

The temperature outside was 72 degrees at 6 am. The temperature rose 4 degrees per hour for the next 12 hours. The total temperature is a function of the number of hours the temperature rose. What was the temperature at noon?

asked on November 20, 2013
26. Biology

Suppose 1.00 ml of blood from a given donor contained 5 X 106 red blood cells and the donor’s hematocrit were 48%. Determine the surface area that the lipids extracted from the plasma membranes of red blood cells obtained from 10.0 ml blood would occupy

asked on September 22, 2013
27. Physics

A rock is dropped from a height of 100 meters above the ground. One second later, a ball is thrown vertically downwards, from the same height, with an initial speed of 13 m/s. How long after the ball is thrown will the two objects be at the same location

asked on February 27, 2013
28. chemistry

Suppose a car's motor draws 231 Ampere of current for 6.3 sec to start the car. What mass of Pb is oxidized in the lead-acid battery to supply this much electricity?

asked on December 2, 2012
29. Chemistry

why would a molecule change color under acidic or basic conditions?

asked on October 23, 2012
30. Chemistry

In the derivation of this expression: [ln]/[HIn]A# 2 * A#1,acid/A# 2,basic * A#1 We assumed that the HIn form of the indicator is the only form present in the most acidic solution. Is this a valid assumption? Why or why not? Support your answer by

asked on October 1, 2012
31. physic

if a ballon gets launched at 60mi/hr at an angle of 38 degrees. How far will it travel in meters?

asked on September 15, 2010
32. Chemistry

Which of these methods is a better representation of the error in a chemical experiment: propagation of error or standard deviation and why? I think it would be standard deviation

asked on October 9, 2012
33. biologia

que nombre recibe el sonido que emiten los murciÃ©lagos

asked on July 5, 2012
1. Art

No name for u lol is right I got them both correct

posted on March 7, 2019
2. math help now plez

Thanks still chill I clicked on the wrong one on 4

posted on March 6, 2019
3. Science

Kitty is right

posted on March 6, 2019
4. Art

My grade is down thanks to guys it C B C E A These are 100% correct promise

posted on March 5, 2019
5. science

Thanks jack

posted on March 4, 2019
6. English

first person

posted on May 22, 2017
7. Chemistry

The response written by DrBob is correct. Using a substitution method with the y=1.0318x, substitute the y in the original formula for 1.0318x, and solve. Keep in mind that you must set z=63.5463 (or just 63.55), otherwise you cannot hope to solve for the

posted on September 4, 2016
8. Language Art

sure did

posted on January 7, 2016
9. L.Arts

Please I need to get a good score so my grades can go up a little more

posted on January 6, 2016
10. algebra

The area is 16 because 4x+6=16

posted on February 4, 2015
11. algebra

The area is 16

posted on February 4, 2015
12. Grammar

Goon' someplace special" voc. I need please,, unscramble the words Osmentsona Cteors Idtiaiicnmsorn Nceotifdn Gneatrioesg

posted on September 23, 2014
13. Statistics

thank you!

posted on December 15, 2013
14. Statistics

so would it be true?

posted on December 15, 2013
15. Algebra NEED HELP ASAP!!!!!!

thank you very much i appreciate it

posted on November 20, 2013
16. Algebra NEED HELP ASAP!!!!!!

need help!!!!!!!!

posted on November 20, 2013
17. Algebra 1

thank u

posted on November 20, 2013
18. unit rate

\$60over 5 lessons divide by one in5 lessons

posted on January 2, 2013
19. chemistry

Thanks!

posted on December 3, 2012
20. Algebra

x-4y=-3 2x+8y=-9

posted on November 20, 2012
21. Chemistry

Molar concentrations: H+= .1M H2A= .100M MB+= 2.00X10^-4

posted on November 18, 2012
22. math

y-2= -1/2 (x-4)

posted on March 28, 2012
23. history project

That's me too, right? XD

posted on October 10, 2011
24. history project

Ms. Sue are you a real-life teacher?c:

posted on October 10, 2011
25. history project

Immigration is when a person (immigrant) moves from their home country to another country in hopes of pursuing a better life.(:

posted on October 10, 2011
26. Thomas Pullen

37! :D

posted on October 10, 2011
27. algebra

Lol jk. I don't know the answer..I don't feel like doing math..D:

posted on October 10, 2011
28. algebra

I know the answer but you don't...suck that!(:

posted on October 10, 2011
29. social studies

I think so and wouldn't this be in "Biology"?

posted on October 10, 2011
30. math

When the problem has the words "about" or "round" or anything relatively close to that in it, I think that's a good time to estimate. Otherwise, use exact numbers, (:

posted on October 10, 2011
31. Physics

Mass Does not need to be used.

posted on January 19, 2011