Food Science B

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PicturePerfect
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Re: Food Science B

Post by PicturePerfect » December 27th, 2012, 11:54 pm

cupcakegirl wrote:
PicturePerfect wrote:How do you measure density with a triple beam balance and a graduated cylinder?

Also, I'm looking at the Food Science ppt. on the soinc.org website, and there's a slide about nutritional labeling. It asks for the total number of calories in one serving (based on the given nutrition facts label). How would I calculate this? (What contributes calories? I know fats, proteins, and carbs contribute calories, but what else? Sodium? Cholesterol?) Thanks!
Well you do know the formula for density right? Mass divided by volume. So measure the mass of a small cube of the cupcake, then either use a ruler or do water displacement to find the volume, then divide the mass of the cupcake by the volume to get the density. :)

As for calories, I'm pretty sure lipids, carbs, and proteins are the only nutrients that contribute calories to a product. If you are doing the math on a random practice label, keep in mind that they may round the amounts but have the exact calories so it might not come out perfect, but is should be pretty close.
For calculating, all you need to remember is 9-4-4. 9 calories/gram of fat, 4 calories/gram of carbohydrate, 4 calories/gram of protein. If you know that, all that is left is some simple multiplication. :)
Yeah, I know the formula, but at an invitational I went to, they asked my partner and I to measure the density of a liquid. So I would use a graduated cylinder to get the volume, but how would I get the mass? (I feel like such an idiot... :( )

Edit: Thank you for the info on calories! :) Also, where could I find some practice nutrition label problems?
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Re: Food Science B

Post by Skink » December 28th, 2012, 6:29 am

What other instruments or equipment did they give you?

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Re: Food Science B

Post by PicturePerfect » December 28th, 2012, 10:47 pm

Skink wrote:What other instruments or equipment did they give you?
I assume you're talking to me, so..

They gave us a graduated cylinder and triple beam balance.
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Re: Food Science B

Post by Skink » December 29th, 2012, 12:28 pm

PicturePerfect wrote:I assume you're talking to me, so..
Not really. I was talking to myself :P
PicturePerfect wrote:They gave us a graduated cylinder and triple beam balance.
Perfect! I mean, picture perfect! Nevermind...the triple beam balance measures mass. Measure the mass of the liquid+container and subtract out the container.

So, after getting the volume reading, put the graduated cylinder on the triple beam balance and measure its total mass. Then, get rid of the liquid (into another container if you have it) and measure the mass of the cylinder by itself. Subtract it out.
mass of liquid = mass of cylinder with liquid - mass of empty cylinder

Then, divide the mass of the liquid by the volume. Make sure to watch the units. Make sense?

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Re: Food Science B

Post by Nerdy One » December 29th, 2012, 3:59 pm

hard event but i love it
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Re: Food Science B

Post by PicturePerfect » December 30th, 2012, 2:55 pm

Skink wrote:
PicturePerfect wrote:I assume you're talking to me, so..
Not really. I was talking to myself :P
PicturePerfect wrote:They gave us a graduated cylinder and triple beam balance.
Perfect! I mean, picture perfect! Nevermind...the triple beam balance measures mass. Measure the mass of the liquid+container and subtract out the container.

So, after getting the volume reading, put the graduated cylinder on the triple beam balance and measure its total mass. Then, get rid of the liquid (into another container if you have it) and measure the mass of the cylinder by itself. Subtract it out.
mass of liquid = mass of cylinder with liquid - mass of empty cylinder

Then, divide the mass of the liquid by the volume. Make sure to watch the units. Make sense?
Heehee! Thanks :)
Nerdy One wrote:hard event but i love it
That it is.
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2013-2014 Event Name | Best Finish |
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Re: Food Science B

Post by Beastybob12345 » December 31st, 2012, 11:11 am

My standard curve isn't working out very good because I tried many different ingredients, but the timings were WAY to spaced apart to make the curve understandable.
Is there any way to fix this problem?
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Re: Food Science B

Post by PicturePerfect » December 31st, 2012, 8:17 pm

Hi! I see you're a Division B student in CA? Maybe I'll see you at a competition!
About your standard curve.. Maybe you should try retiming them? You might be stopping the timer at different times. Also, you should have a list of ingredients in the rules that you should try. Those seem to be sufficient; I don't think you will need to try other ingredients. My teacher had us make one graph for 'flowing' liquids like water and another one for 'dripping' liquids like honey. That might help.
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Re: Food Science B

Post by Beastybob12345 » January 3rd, 2013, 11:12 am

Thanks pictureperfect. Making the 2 separate graphs is a better idea. And see you at the regionals maybe :)
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Re: Food Science B

Post by PicturePerfect » January 3rd, 2013, 1:26 pm

No problem, and maybe! :D
2012-2013 Event Name | Best Finish |
Heredity | 2nd
Forestry | 3rd
Food Science | 5th
Team | 1st

2013-2014 Event Name | Best Finish |
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Water Quality | 7th
Shock Value | 7th
Wheeled Vehicle | 7th

2014-2015 Event Name | Best Finish |

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