Monday, February 23, 2009

Design Lab

Design Lab 1:
Investigate (quantitatively) a factor affecting the rate of a
reaction.

Dependent:
Change in concentration, volume of gas, intensity of colour, etc.

Design Lab 2:
Investigate a factor affecting the viscosity of a liquid.

Dependent:
Time taken to flow through a burette or pipette (or similar).

Please see IB Lab Rubric for specific instructions and stay tuned in class for more details.

18 comments:

Ray said...

So we can pick any substance that can vary in viscosity? make sure aaron doesnt do his first choice.

brian said...

When are these due?

Ms. Marostica said...

Lab 1: March 13th
Lab 2: March 20th

Ms. Marostica said...

"So we can pick any substance that can vary in viscosity? make sure aaron doesnt do his first choice."

--Yes? This question makes me nervous... :-/

Edward said...

Ms. Marostica, is it okay if i do an investigation on how manganese dioxide affects the rate of reaction in a hydrogen peroxide reaction?

aaronob said...

Ok, so does it matter which lab we turn in first? Like could I turn in the viscosity one first or what?

And wow Ray.... honestly??? And Im disappointed in Ms Marostica for not giving me enough credit... com'on =, guys!

aaronob said...

Ok, I looked at the files for the design lab on the schoolandteacher website... Im lost as to exactly what sections we need...

Do we need data? Do we need a conclusion? I understnad we need purpose/aim, procedures, apparatus, and background.... is there anything else? Did I miss something in the files? Help please!

Cutter said...

You know those mentoes soda fountains you can make? Could I measure the amount of gas given off by that? I would be able to use different sodas to see what's best? Too kiddy? Definitely not very lab technique-ish.

jasonfridlund said...

can we ask questions in the procedures as if this was a lab instruction sheet.

I figured as much because a design lab seems like a prepared lab procedure waiting to be done by a student.
?
?

taimi jacobson said...

in class you said something about wanting to see our sources. what do we need to have with our labs for class tomorrow?

Ian said...

Can I use an oven to heat a glass flask containing oil? The glass should hold according to its melting point and the wisdom of my family....?

Ian said...

And can that heating take place over roughly 10 hours per sample? I have 5 samples that need heating.

dustin said...

alright so 4 the viscosity lab is adding a chemical to the initial liquid considered making it a different liquid and therefore not a valid comparison?

dustin said...

just throwin it out there...

brian [thebaker] said...

Can we determine change in viscosity under the effects of temperature changes by utilizing Stokes law? like would that fit with this lab or is it going into something off topic?

Ms. Marostica said...

"alright so 4 the viscosity lab is adding a chemical to the initial liquid considered making it a different liquid and therefore not a valid comparison?"

If a chemical reaction takes place then you have a new solution. If no chemical reaction is taking place then you simply have a soluton (solute + solvent). Depending on the context, either of these situations could suffice.

Ms. Marostica said...

"Can we determine change in viscosity under the effects of temperature changes by utilizing Stokes law? like would that fit with this lab or is it going into something off topic?"

That is fine as long as you explain and cite Stokes Law.

t-t-t-tia.! said...

Does octane come in a fluid form and if so is it pure octane?

thanks =)