Concentration and Reaction Rates - Science Theater 10

[2bhat]

so epic!

[daSkaterkiDgirl]

WHAT DOES CONCENTRATION MEANS? I SEARCHED IT UP AND IT MAKES NO SENSE.

[sciencetheater]

@daSkaterkiDgirl It is how much of something you put in a liquid. LOTS of sugar in a little bit of water is a HIGH concentration. Just a SMALL amount of sugar in LOTS of water is a LOW concentration.

[SugarCrazedInsomniac]

getting high on oxygen i see XD

[mumujk]

Cool! 2:57

[xoxosahar]

question: how do you dispose hcl and sodium thiosulfate? can you pour them down the drain?

[sciencetheater]

@xoxosahar Check with local authorities. It often depends on concentrations, etc... (for example, HCl can be neutralized to become water and a salt...) Also look up the safety information available from whoever sold you the chemicals. Most companies now have handy databases to help with disposal issues.

[ji89412]

what is the difference of how much and the concentration of the substance?

[sciencetheater]

@ji89412 Think of making frozen orange juice. When it is in the can, it is a certain amount of orange. When you put it in a pitcher and add water, it is still the same amount of orange, there is just more water there, too. So the Concentration of orange changed, not how much orange is present.

[minorballer]

i can see one of caspers enemy in da last experiment 3:13 to 3:24

[ScientiaVeritasEtLux]

how would the reaction look if it were 100% hydrogen peroxide? Would it go so fast as to be explosive, or would it just do the same "toothpaste" effect but at an even faster rate?

[sciencetheater]

At some point it would be dangerous and explosive. 100% hydrogen peroxide would probably be too unstable to even sit by itself (if you could even make it.)

[sciencetheater]

An explosion can often be thought of as a really, really fast reaction.

[waw1235]

hello, hmm can  u please tell me the measurments u used and the products u used thank u

[sciencetheater]

If you look around the internet for the science demo "Elephant Toothpaste", you should find a list of the ingredients and directions.

[rosannadanicamaguad]

could you make videos about rate of reaction and explaining it?

[sciencetheater]

Well, this video touches on it, but I'll think about it! My goal is to avoid the math portions just to focus in on the main conceptual parts of things as much as possible.

[rosannadanicamaguad]

thanks! :)

[MerlinofAmber]

Well, you got a bit of airplay, we're calculating the actual rates from your experiment in my Chemistry 12 class.

[sciencetheater]

Sweet! hope you got a good grade! Did you use a stopwatch or analyze fames & framerate to get a time?

[dioprem]

Nice reaction. I have seen that you have created videos to demonstrate the effects of temperature and concentration on the rate if reaction. It would be great if you could come up with similar videos to demonstrate the effects of pressure, catalyst and surface area on the rate of reaction. Would like to see the differences.

[LOLFunny687]

woah cool lol

[omarmndz14]

next time do 100%...jk

[Tappermccabe]

What are the measurements???

[sciencetheater]

The actual rates? I was only hoping to show the qualitative differences, not the quantitative (numerical) differences. I don't have the equipment to do a nice quantitative measurement.

[MerlinofAmber]

Oh, all you need to calculate the rates is a stopwatch. You don't have the proper equipment for quantitative measurement? My advice: get a watch.

[sciencetheater]

Touche'! Although in the case of the higher concentration, I might argue it is too fast to make a good "live" measurement with just a stopwatch. (Well, at least for me to both run it and run a stopwatch... I'm working with one cameraman anyway...)

The biggest reason to not calculate the rate is to avoid the math. I'm trying to get across the concepts much more than the techniques...

(How did you measure the change in concentration of the substances with just a stopwatch?)

[joeyfung85]

wow

[mayhemjonny]

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[edtronic]

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