Cristian

This page lists questions and answers that were posted by visitors named Cristian.

Questions

The following questions were asked by visitors named Cristian.

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

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 determ...

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

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

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

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?

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

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?

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 tit...

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

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...

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?

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?

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

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

Answers

The following answers were posted by visitors named Cristian.

Mass Does not need to be used.

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, (:

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

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

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

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

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

That's me too, right? XD

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

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

need help!!!!!!!!

thank you very much i appreciate it

so would it be true?

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

The area is 16 because 4x+6=16

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

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...

I came here for answers, i also think its d tho, this might be 4 years later but i think its d