Lab Report Mechanical and Chemical Digestion Purpose How
Lab Report- Mechanical and Chemical Digestion Purpose: How does mechanical digestion affect the rate of chemical digestion?
Background Information �What is mechanical digestion? ◦ Mechanical digestion is movement that breaks food down into smaller pieces. ◦ Example: teeth crushing food in the mouth. �What is chemical digestion? ◦ Chemical digestion is chemicals being added to change food into different substances. ◦ Example: Saliva changes bread into starch and sugar.
Prediction �If we allow one antacid to remain whole, and crush the others into pieces, then ----------------because ------------
Plan- Materials � 3 antacid tablets � 10 ml of acetic acid (vinegar) � 1 25 ml graduated cylinder �plastic stirring rod �Dixie cup � 1 pair of scissors/plastic knife
Plan- Procedure � 1. ONE partner will take graduated cylinder to the vinegar station. Pour 10 ml of vinegar into the graduated cylinder. � 2. Once you are sure your measurements are correct, carefully walk the graduated cylinder back to your seat and pour the 10 ml of vinegar into your dixie cup. � 3. Start your timer. � 4. Place 1 antacid tablet into the beaker with the vinegar. � 5. Record observations every 30 seconds for a total of 3 minutes.
Plan- Procedure � 7. Repeat steps 1 -6 using an antacid tablet that you cut into 4 pieces. (Very carefully!) � 8. Repeat steps 1 -6 using an antacid tablet that you crush!
Data Collection Tablet Number Consistency Time (sec) 1 Whole 30 1 Whole 60 1 Whole 90 1 Whole 120 1 Whole 150 1 Whole 180 2 4 pieces 30 2 4 pieces 60 2 4 pieces 90 2 4 pieces 120 2 4 pieces 150 2 4 pieces 180 Observations
Data Collection Tablet Number Consistenc y Time (sec) 3 Crushed 30 3 Crushed 60 3 Crushed 90 3 Crushed 120 3 Crushed 150 3 Crushed 180 Observations
Conclusions �Do you see any patterns or trends in your data? If so, what are they? � NO GRAPH REQUIRED!
Claims and Evidence �What is the answer to your prediction question? How does mechanical digestion affect the rate of chemical digestion? �What data do you have that supports your answer? Give specific examples.
Reflection �What did you learn from this lab? �Discuss any errors or potential errors. �If you were asked to do this lab again, what would you do different?
WRAP-UP �All trash should be thrown into trash can◦ ONE Dixie cup, ONE stir stick, etc. �Wipe work area down with a damp paper towel. I should not see any crumbs on trash on tables �Place stopwatch, safety glasses, scissors, etc. and items for next class (1 cup, 1 stir stick) back into basket
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