View the presentation below to see pictures of the apple slices and read written observations. Which slice do you think was best preserved?
Monday, January 26, 2009
Experiment Design
Materials:
5 equally sized apple slices
5 cups
1 cup of the following substances: sugar, salt, vinegar, and lemon juice
plastic wrap
tape
marker
Procedure:
1. Use the tape and marker to label the 5 cups as follow, "Control," "Sugar," "Salt," "Vinegar," and "Lemon Juice."
2. Place an apple piece inside cup.
3. Pour the full cup of each substance in the cordinating cup. Do not put anything other than the apple piece into the jar marked "Control."
4. Set all cups in a cool, dry place.
5. After 60 hours retrieve the cups. Examine the apple slices and record any changes to their appearance. Concentrate on the following physical properties, size texture, color, and taste.
5 equally sized apple slices
5 cups
1 cup of the following substances: sugar, salt, vinegar, and lemon juice
plastic wrap
tape
marker
Procedure:
1. Use the tape and marker to label the 5 cups as follow, "Control," "Sugar," "Salt," "Vinegar," and "Lemon Juice."
2. Place an apple piece inside cup.
3. Pour the full cup of each substance in the cordinating cup. Do not put anything other than the apple piece into the jar marked "Control."
4. Set all cups in a cool, dry place.
5. After 60 hours retrieve the cups. Examine the apple slices and record any changes to their appearance. Concentrate on the following physical properties, size texture, color, and taste.
Sunday, January 25, 2009
Research, Research, Research
Did you know that pretty much the only food that does not have preservatives in it is the food that you grow in your backyard garden? Preservatives are used to keep food fresh as it is traveling from the producer to the consumer. Humans obviously need food to survive, so learning how to keep food fresh, especially through the winter months, was something learned long ago.
I research 2 main areas of food preservation to help me make the best possible hypothesis.
#1 - How is food preserved today
#2 - Ancient methods of food preservation
#1 Today there are specific techniques and chemicals that are used to keep food fresh. The techniques include: boiling, freezing, refrigeration, pasteurizing, dehydration, pickling, nuclear radiation, and vacuum and hypobaric packing.
I found this handy chart that breaks down the basic chemicals used for preservation and why they are used.
Source - http://www.foodadditivesworld.com/preservatives.html
#2 Here is a list of several methods used to preserve food in ancient times.
Ages-old food preservation techniques include drying, smoking, cooling, freezing, fermenting, salting, pickling, and canning.
http://www.capzles.com/38e612df-c318-486e-9713-ece12f4a9960
Source - http://www.scienceclarified.com/Ex-Ga/Food-Preservation.html
I research 2 main areas of food preservation to help me make the best possible hypothesis.
#1 - How is food preserved today
#2 - Ancient methods of food preservation
#1 Today there are specific techniques and chemicals that are used to keep food fresh. The techniques include: boiling, freezing, refrigeration, pasteurizing, dehydration, pickling, nuclear radiation, and vacuum and hypobaric packing.
I found this handy chart that breaks down the basic chemicals used for preservation and why they are used.
Source - http://www.foodadditivesworld.com/preservatives.html
#2 Here is a list of several methods used to preserve food in ancient times.
Ages-old food preservation techniques include drying, smoking, cooling, freezing, fermenting, salting, pickling, and canning.
http://www.capzles.com/38e612df-c318-486e-9713-ece12f4a9960
Source - http://www.scienceclarified.com/Ex-Ga/Food-Preservation.html
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