Monday

September 26, 2016
Total # Posts: 371

**chemistry**

0.1 M means 0.1 mol/liter

*February 4, 2008*

**chemistry**

TRIS is a buffer used in biochemistry

*February 4, 2008*

**chemistry**

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at the start of the ...

*February 4, 2008*

**chemistry**

here is how to solve the problem, put I need help following these instructions. would you show me the math step by step, so I could understand? Here is how to solve the problem: Use the Henderson-Hasselbalch equation. pH = pKa + log ([Tris] / [Tris HCl]). Here the pH is 8 and ...

*February 3, 2008*

**chemistry**

This is my third time to ask this and no one has answered. Please help. An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced...

*February 3, 2008*

**chemistry lab**

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at the start of the ...

*February 2, 2008*

**chemistry**

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at the start of the ...

*February 2, 2008*

**chemistry**

Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third? 1) What is the pH of a 0.05 M solution of TRIS acid (pka = 8.3)? My answer: I ...

*February 2, 2008*

**Algebra 2 - Direct Variation**

I already did this problem but i decided to check my self since my answer wasn't withthe status quo of the rest of the answers i checked twice and got the same answer. But will someone double check me. The designers fo the Parthenon, a Greek Temple completed in 432 B.C., ...

*January 23, 2008*

**math**

Divide teh 2 to both sides of the fits equation making a = 4 then Subsituted the 4 for a in the second equation making it 4+B=2 then subtract the four from both sides making the equation B equels -2

*January 9, 2008*

**Algebra II**

Buggs made the trip at 40 mph during the first Hiatus. Joan Made the same trip at 50 mph during the second hiatus. How long was teh trip if it took Buggs 2 hours longer than it took Joan. I know the Distance equals rate X Time and I tried using that meathod three times but i ...

*January 2, 2008*

**physics**

Gauge Pressure(P) = Density(p) x gravity(g) x height(h) 1.33x10^4Pa = 1.02* x 9.8m/s x h *: Specific gravity = ratio of density of solution to water .:. Density = 1.02(no units) .:. h = 1.33x10^4 / 1.02 x 9.8 = 1330.5m^3 = 1.33m

*December 16, 2007*

**english**

1. b 2. a 3. c 4. c 5. a 6. b 7. a 8. b 9. d 10. d 11. 12. 13. 14. 15.

*November 30, 2007*

**english**

this is a portion of my english homework that i cant do. i was assigned over 100 questions and these are the ones i need the most help with and i need to turn it in in like an hour so any help would be great :-) 1. Which is not a sentence fragment? A. Because I knew she would ...

*November 30, 2007*

**GEOMETRY AGAIN**

THIS IS ANOTHER QUESTION I HAVE BEEN STUCK ON FOREVER. I THINK IT REQUIRES TOO MUCH THINKING. PHILLIP WALKED 100 YARDS TO THE EAST WHILE SHONDRA WALKED 155 YARDS TO THE SOUTHEAST. MEANWHILE, 200 YARDS TO THE NORTH, JOSE WALKED 155 YARDS TO THE WEST AND LUYIN WALKED 100 YARDS ...

*November 20, 2007*

**geometry**

I HAVE BEEN STUCK ON THIS QUESTION FOREVER. CAN SOMEONE HELP ME OUT WITH IT. DO THEOREMS REQUIRE PROOFS? EXPLAIN EITHER YES OR NO IN ONE OR TWO SENTENCES.

*November 20, 2007*

**geometry**

Wrtite the slope intercept form of the equation of the line passing through point (5,1) and parallel to the line y=-4x-2.

*October 30, 2007*

**Algebra II**

A train left Podunk and traveled north at 75 Km/h. Two hours later, another train left Podunk and traveled in the same direction at 100 km/h. How many hours had the first train traveled when the second train overtook it?

*October 29, 2007*

**geometry**

ok i get it now i just didnt know what he was saying at first but now I know thanks.

*October 26, 2007*

**geometry**

Write the slope intercept form of the equation of the line passing through the points (-2,4) and are perpendicular to the line y=-3x+3.

*October 26, 2007*

**geometry**

Write the slope-intercept form of the equation of the line passing through the point (5,1) and parallel to the line y=-4x-2.

*October 26, 2007*

**Geometry again**

Write the slope-intercept form of the equation of the line passing through the point (5,1) and parallel to the line y=-4x-2.

*October 26, 2007*

**Geometry**

so the answer must be A right

*October 26, 2007*

**Geometry**

Which best describes the relationship between the lines with equations -16x+2y=0 and -x-8y=-2? a. neither parallel nor perpendicular b. parallel c. same line d. perpendicular

*October 26, 2007*

**geometry**

Which is the slope of a line perpendicular to the line 4x-2y=5?

*October 26, 2007*

**Algebra**

Do you distibute the 7 to the top, bottom, or both.

*October 15, 2007*

**writing**

Wow Everyone agrees! ^^

*October 15, 2007*

**writing**

Interesting choice, I would have totally choose a republic, LOL, but If you wnat you could write it in the view of yourself. Put personal things into it, but not, date it as a journal entry, maybe just relax and let you brain think of what you want ot write.

*October 15, 2007*

**Government**

For my class I have to have a good spy story. Basically one that got caught. I have found some but my classmates got to the teacher before me. does anyone know of any good sites that I could use

*October 15, 2007*

**Chemistry**

yay i have a good idea ^^

*October 15, 2007*

**Chemistry**

Maybe you can find a picture of it on the internet and post the url for everyone to click on to see

*October 15, 2007*

**math**

well a hint is that it starts with a vowel because before the line a an is written showing that is starts in a A, E, I, O or U

*October 15, 2007*

**math**

48 cans

*October 15, 2007*

**Help please!!**

She usually gives written tests with not diagrams

*October 11, 2007*

**Help please!!**

thank you

*October 11, 2007*

**Help please!!**

I am currently inrolled in a biology class, I pay attentionin class, I take all the notes possible, I study for the test at least 4-5 days in advance. I am putting 110% of my effort into this class. I am an A student but I am getting d's on the tests. I don't know what...

*October 11, 2007*

**math test**

Well, If you have your book from the class, I always find it helpful to re-read the chapters that the teacher told me to study as a reminder and try to memorize the important facts. Also see if you can find any questions over what you need to study on the internet and solve ...

*October 11, 2007*

**Algebra 2**

I have just found Jiskha but i will remember for the rest of my high school carreer

*October 11, 2007*

**Algebra 2**

thanks

*October 11, 2007*

**Algebra 2**

thanks now how did you solve it what did you do?

*October 11, 2007*

**Algebra 2**

Where do the following lines meet on a coordinate system? e.g. (x,y) x+3y=4 2x-y+8

*October 11, 2007*

**geometry**

Name the property which justifies the following conclusion: given: 3q+9r conclusion: 3(q+3r)

*October 3, 2007*

**geometry**

Name the property which justifies the following conclusion: given: 3q+9r conclusion: 3(q+3r)

*October 2, 2007*

**geometry**

Choose the phrase that completes the following statement as stated by the point, line, and plane postulates: Once plane___________ passes through three noncollinear points. a. never b. sometimes c. always d. point, line, and plane postulates do not address this topic directly.

*October 2, 2007*

**geometry**

i kinda accidentally put up the question up 3 times

*October 2, 2007*

**geometry**

Choose the phrase that completes the following statement as stated by the point, line, and plane postulates: Once plane___________ passes through three noncollinear points. a. never b. sometimes c. always d. point, line, and plane postulates do not address this topic directly.

*October 2, 2007*

**geometry**

Rewrite the statement in if-then form. All equilateral triangles have three congruent sides. a. a figure has three congruent sides if and only if it is an equilateral triangle. b. a figure is an equilateral triangle if and only if it has three congruent sides. c. if a figure ...

*October 2, 2007*

**geometry**

Decide which one of the following statements is false. a. any three points lie on a distinct line. b. three noncollinear points determine a plane. c. a line contains at least two points. d. through any two distinct points there exists exactly one line. my best guess would have...

*October 2, 2007*

**geometry**

i was in honors in jr. high and my new high school doesn't offer it so i'm stuck in just regular geometry. I also think algebra 2 is easy it is just that geometry gets you sometimes.

*October 2, 2007*

**geometry**

yes i'm correct for once

*October 2, 2007*

**geometry**

Refer to the following statement: Two lines are perpendicular if and only if they intersect to form a right angle. A. Is this a biconditional statement? b. Is the statement true? this is what I put a. yes b. yes

*October 2, 2007*

**geometry**

thank you very much

*October 2, 2007*

**geometry**

Which of the following is an example of transitive property? a. If x=5, then x-2=5-2 b. If x+5=y and y=-2, then x+5=-2 c. x+5=x+5 d. If y=x-2, then x-2=y my answer is B. That is my best answer to this question because my book doesn't adequately explain what transitive ...

*October 2, 2007*

**geometry**

ok i'll start doing that from now on

*October 2, 2007*

**geometry**

oh i get that alot

*October 2, 2007*

**geometry**

i'm trying i'm just posting the questions up so I can compare other peoples work to mine to see if im correct cause i dont want to turn in my homework and get an f again

*October 2, 2007*

**geometry**

Rewrite the biconditional as a conditional statement and its converse and then determine if the biconditional is an accurate definition: Two angles are supplementary if and only if they form a linear pair conditional:_____________________________ converse:...

*October 2, 2007*

**geometry**

i thought it was that answer too but i thought the answer was just too simple to be true

*October 2, 2007*

**geometry**

it doesn't make sense to me either thats why i'm posting the question up

*October 2, 2007*

**geometry**

Write the converse: If p, then q.

*October 2, 2007*

**geometry**

yes thank you

*October 2, 2007*

**geometry**

Rewrite the postulate in if-then form. "A line contains at least two points."

*October 2, 2007*

**Chemistry**

compute volume and/ or weights of reagents to make the following solution. Desired concentration: 22 ug/mL bovine serum albumin Desired quantity: 100 mL Given: 95% bovine serum albumin I'm not sure how to do this so any help would be great. Thanks!

*September 18, 2007*

**Chemistry**

compute volume and/ or weights of reagents to make the following solution. Desired concentration: 40% NaOH + 4% Na2S2O3 Desired quantity: 1500 mL Given: 90% w/w NaOH, pure Na2S2O3 I'm not sure how to do this so any help would be great. Thanks!

*September 17, 2007*

**chemistry**

compute volume and/ or weights of reagents to make the following solution. Desired concentration: 40% NaOH + 4% Na2S2O3 Desired quantity: 1500 mL Given: 90% w/w NaOH, pure Na2S2O3 I'm not sure how to do this so any help would be great. Thanks!

*September 16, 2007*

**chemistry**

Determine the molarity of 30% (w/w) KOH of specific gravity 1.29. Thanks for any help.

*September 10, 2007*

**Chemistry**

I have a table that has the vapor pressure of water at selected temperatures. It is converted from celsius to torr. For example: 18°C = 15.5 torr 19°C = 16.5 torr Unfortunately, the temperature I got is 18.5°C. How do I convert it to torr? The book has no equation ...

*March 30, 2007*

**voc electronics**

what happens when iron is heated It gets hot. Ha, Ha. But I'm sure you didn't want that for an answer. Please be more specific about what you are looking for and I can refine that answer for you.

*February 27, 2007*

**social studies**

ways and need to preserve and protect monument like konark and sanchi http://www.jiskha.com/display.cgi?id=1150207722.1150232150

*September 1, 2006*

**To Dr.Bob**

what up?!

*June 11, 2006*