SCIENCE
STUDENT'S NAME
----------------------------BOOK 3
Food Science
Produced by
Helen O'Reilly and Jackie Pierce
Aug.2008©
1
MODULE ----------------Food Science
 Test for Starch. Exp and Write up.
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 Test for Protein and Test for Fat. Exp and Write up. □
 Toothpaste. Test for Grittiness. Exp and Write up.
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 Testing cereal for Starch. Exp and Write up.
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 Testing Ph of Food/ Drinks. Exp and Write up.
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 Growing Bacteria.
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 Internet investigation on a “Food Matter”.
Produce a poster project.
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 Visit to a food Factory. Write report.
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 Design Questionnaire on Diet/Food.
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2
Food is a fuel
It gives our body Energy
It also helps us to Grow and Repair when needed.
In our diet we need to have……
Carbohydrate
Protein
Minerals
Fibre
Fats
Vitamins
Water
Carbohydrate (starch and sugar)….
Bread, pasta, potatoes, rice, sugar
Protein…..
Milk, eggs, meat, fish, chicken, beans
Fats….butter, oils, fatty meat
3
Test for Starch:Need:-…..bread, iodine, test tube and dropper
Method:
 Put a small piece of bread into a test tube
 Add a few drops of Iodine
 If a blue-black colour appears Starch is present
Colour of iodine at start ______________________
Colour when added to bread ____________________
Does bread have starch in it? ___________________
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4
LEAVING CERTIFICATE APPLIED SCIENCE
MODULE: Food Science
Student’s name ___________________
Date______
Laboratory Experiment
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Why I am doing this experiment
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List of equipment and materials I will need
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How I carried out the experiment in point form
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Diagram
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Results of my experiment
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Conclusion
What I have learnt from this experiment
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What I would change if I were doing this
experiment again
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Reflection
What I enjoyed about the experiment
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What I disliked about the experiment
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8
Test for Protein:Need:- milk, egg white, tea
Biuret reagent (sodium hydroxide and copper sulphate)
Test tubes, dropper, ppe (goggles)
Method:1 Put food into test tube
2 Add 2mls of sodium hydroxide carefully
3 Add 2 drops of copper sulphate
4 Swirl gently
5 If protein is present a purple/violet colour will be
seen
Result:
Which food contains protein?
Milk [
]
Egg white [
]
Tea [
]
9
Test for Fat:Need :- butter, cheese, onion
Brown paper.
Method : Rub the food to be tested gently in brown paper
 Does a translucent spot appear? Hold up light.
 Let it dry in warm place for few minutes.
 If translucent spot remains, fat is present.
Result:
Which foods contain Fats?
Butter [ ]
Cheese [ ]
onion [
]
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LEAVING CERTIFICATE APPLIED SCIENCE
MODULE: Food Science
Student’s name ___________________ Date______
Laboratory Experiment
___________________________________
___________________________________
Why I am doing this experiment
___________________________________
___________________________________
______________
List of equipment and materials I will need
___________________________________
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How I carried out the experiment in point form
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Diagram
Results of my experiment
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Conclusion
________________________________________
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What I have learnt from this experiment
________________________________________
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What I would change if I were doing this experiment
again
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Reflection
What I enjoyed about the experiment
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What I disliked about the experiment
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Toothpaste
Examine for Grittiness
To examine 3 different toothpastes
 ______________________
 ______________________
 ______________________
Method
1. Smear a small amount of toothpaste 1
a slide
on
2. Cover with a coverslip
3. View under microscope
4. Record what you see
5. Repeat using toothpaste 2 and 3.
6. Compare results
Results
_____________________________
_____________________________
_____________________________
Which has the most grit? __________________
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Student’s name ___________________ Date______
Laboratory Experiment
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Why I am doing this experiment
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List of equipment and materials I will need
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How I carried out the experiment in point form
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Diagram
Results of my experiment
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Conclusion
What I have learnt from this experiment
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What I would change if I were doing this
experiment again
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Reflection
What I enjoyed about the experiment
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What I disliked about the experiment
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Testing Cereal for Starch:Remember Starch Test
Iodine + Starch = [
] (colour)
Need :- Wheat, Oats, Barley, Rye, Iodine, Spotting tile,
Water, 4 x Pestles and mortars.
Method:
 Grind up each of the cereals with separate pestle
and mortar.
 Add 5mls of water to each
 Label 4 dishes in spotting tile with each cereal
name
 Add the cereals to the dishes.
 Add a few drops of iodine to each dish
 Note the colour change.
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Student’s name ___________________ Date______
Laboratory Experiment
___________________________________
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Why I am doing this experiment
___________________________________
___________________________________
List of equipment and materials I will need
___________________________________
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How I carried out the experiment in point form
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Diagram
Results of my experiment
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Conclusion
What I have learnt from this experiment
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What I would change if I were doing this
experiment again
___________________________________
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Reflection
What I enjoyed about the experiment
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What I disliked about the experiment
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22
Testing the pH of common foods/drinks
using universal indicator paper.
Dentists have been warning about the dangers of
drinking acidic drinks.
Teenagers who drink a large amount of fizzy drinks
suffer from tooth erosion.
The acid in the drinks dissolves the enamel that
covers their teeth
The recommended safe level of pH of drinks is 5.5;
anything below this can promote tooth decay.
Need:10 test tubes, 10 food/drink samples, book of indicator
paper
Method:
 Line up several test tubes in a test tube rack.
 To each test tube add a sample of food/drink
 Estimate the pH of each sample
 Fill in record table
 Add 1 slip of universal indicator paper to each test
tube
 Note the colour change
 Compare colour to the colour chart
 Record the pH of each sample in the record table
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Food/Drink
Estimate
Actual
Milk
Coke
Tea
Egg white
Egg yoke
Apple juice
Ribena
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Student’s name ___________________ Date______
Laboratory Experiment
___________________________________
___________________________________
___________________________________
Why I am doing this experiment
___________________________________
___________________________________
___________________________________
List of equipment and materials I will need
___________________________________
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___________________________________
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How I carried out the experiment in point form
___________________________________
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Diagram
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Results of my experiment
Food/Drink
Estimate
Actual
Milk
Coke
Tea
Egg white
Egg yoke
Apple juice
Ribena
Conclusion
What I have learnt from this experiment
___________________________________
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What I would change if I were doing this
experiment again
___________________________________
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___________________________________
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Reflection
What I enjoyed about the experiment
___________________________________
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What I disliked about the experiment
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Bacteria, Fungi and Viruses are micro-organisms.
They can only be seen with the help of a microscope.
10 Bacteria can cause diseases eg strep throat,
salmonella.
11 They can cause food-poisoning
12 They can make food decay
13 They can make milk go sour
14 Hygiene is very important in the food industry
15 Washing hands can prevent bacteria from
spreading
16 Bacteria are found everywhere.
Growing Bacteria
Bacteria colonies can be grown on a special medium call
AGAR in special dishes called PETRI PLATES.
These colonies are made up of millions of cells and
are then visible to the naked eye.
Wash your hands!
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Growing Bacteria
Need:- Petri plates containing Agar, Inoculating needle,
Bunsen, cotton wool, Savlon.
Method: Wipe down the bench with cotton wool soaked in
Savlon
 Heat the inoculating needle in Bunsen flame to
sterilise it
 Let it cool
 Touch it off the source of micro-organisms
 Remove the lid of the petri plates, holding it
above the base
 Streak the agar with the inoculating loop
 Replace the lid, seal and label
 Place the plates up side down in incubator
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



Wash hands and wipe down bench again
Set at 37ºC for 3 days
Examine after to see what grows
Write up report
Fungi look like black and white furry thread like
growths
Bacteria are in colonies of small shiny ‘pin heads’.
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Student’s name ___________________ Date______
Laboratory Experiment
___________________________________
___________________________________
Why I am doing this experiment
___________________________________
___________________________________
List of equipment and materials I will need
___________________________________
___________________________________
___________________________________
___________________________________
___________________________________
___________________________________
How I carried out the experiment in point form
___________________________________
___________________________________
___________________________________
___________________________________
___________________________________
___________________________________
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Diagram
Results of my experiment
___________________________________
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Conclusion
What I have learnt from this experiment
___________________________________
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What I would change if I were doing this
experiment again
___________________________________
___________________________________
___________________________________
___________________________________
Reflection
What I enjoyed about the experiment
___________________________________
___________________________________
___________________________________
___________________________________
What I disliked about the experiment
___________________________________
___________________________________
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34
INTERNET INVESTIGATION ON A ‘FOOD MATTER’
And DESIGN A POSTER
Design a Healthy Lunch Box
Draw a Food Pyramid
Healthy snacks V’s Unhealthy snacks
Bad Diet
Eating Disorder
Hygiene in the Kitchen
How to preserve food
Food Additives
A good Breakfast
Calorie counts in Common Foods
Malnutrition
Obesity in Children
You are what you eat.
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Visit to a Food Factory
Name of Factory
Address
What does this Factory Produce?
Date of Visit
Name of Guide
What section/s of the Factory did you visit?
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What kind of workers did you see?
What jobs were they doing?
How many people were employed there?
What were the workers wearing? Had they special
coats?
Why had they to wear special clothes?
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Could they wear jewellery? Explain why?
Is Hygiene important in this factory? How do you
know?
Why?
Had the Factory got a person called the Quality
Controller?
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If ‘yes’. What did that person do?
What did you find interesting about this factory?
Write a short note on this visit. Outlining what you
learnt from your visit.
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39
Design a Questionnaire on ‘Healthy eating in our
school’.
Look up samples of Questionnaires already done in Books or on the
Internet
Make out a list of questions to ask.
Approx. 10 to 15 questions
Questionnaires should be easy to read
A person should be able to fill it out quickly and easily
Look for simple answers e.g.
Type it out on the computer
Yes [ ]
□
or
No [ ]
boxes to tick
Design it with bullet points or numbering
Add a ‘title’
Decide if you’ll ask the person to put their name on it.
Decide if you’ll ask the person to put their age on it.
Decide on what font to use
Add some clip art
Sign it at the end
Print it out
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