Transcript 8A1 Food - Chemistry Resources for IB, AP, Alevel, GCSE

8A1 Food
Are these meals good for you?
Dish of the Day
Today’s Specials
Chef’s Choice
Fried bacon
Fried sausage
Fried egg
Fried bread
Fried mushrooms
Fresh pasta with
boiled rice and
curry sauce
Celery
Lettuce
Red pepper
Onion
Ice cream
Bread and butter
pudding
Apples and oranges
These are the essential nutrients
Carbohydrates (starch & sugars)
Proteins
Fats
Vitamins
Minerals
Fibre
Water
Protein
What do we use it for?
Making new cells, growth
What foods contain it?
Meat, fish, nuts, cheese, eggs, beans, peas, lentils
Fat
What do we use it for?
Source of energy
Making cells and hormones
Insulation
What foods contain it?
Butter, nuts, sunflower oil, red meat, salmon,
cream, ice cream
Carbohydrates
What do we use them for?
Source of energy for activities
What foods contain them?
Potatoes, pasta, rice, bread, sugar, cereal
Food tests
• We can test foods to see what substances they
contain.
• Why do you think this would be useful?
These are some of the most common food tests:
Substance
tested
Test
Result
Starch
Iodine
Turns blue-black
Sugars
Benedicts solution Turns red
Proteins
Biuret test
Turns purple
Fats
Emulsion test
Turns cloudy
white
Food Venn diagrams
Fat
Protein
Make a copy of this
Venn diagram.
Now put these foods
into your diagram:
Carbohydrate
• salmon
• cornflakes
• cod
• nuts
• milk
• chicken
• rice
• bread
• strawberries
• chips
• sausages