Physical Properties
What is a physical property?
A physical property is a characteristic of a substance that can be observed without changing the substance into another substance.
What is a physical change?
Refer to changes in size, state or shape or changes in other physical properties.
What are sensory evaluations?
a scientific method that measures and interprets how people perceive food through their senses
What is an extensive property?
DEPENDENT on the amount of a substance that you have.
What is an intensive property?
NOT DEPENDENT on how much you have.
Name 2 examples of intensive properties.
Density
Melting point
Boiling point
Provide an example of a physical change when making a s'more.
melting chocolate from solid to liquid
Name one characteristic you would evaluate in a s'more.
■Appearance
■Texture
■Flavor: Taste & Aroma
Give 2 examples of extensive properties in food.
Volume
Mass
Weight
Size
Name one intensive property of chocolate.
melting point
What is the difference between extensive and intensive properties?
Extensive properties are DEPENDENT on the amount of a substance that you have. While Intensive properties are NOT DEPENDENT on how much you have.
What happens to a marshmallow when heated in the microwave?
melts
How does the taste of a s'more change after being toasted?
The taste of a s'more changes after toasting due to chemical reactions that occur during the toasting process
Explain how volume is an extensive property of a s'more.
Mass and volume are extensive properties because they depend on the size or amount of a s'more which is composed of chocolate, graham cracker and marshmallow.
How does temperature affect the intensive properties of food?
Just like in s'mores, we heat the marshmallow and chocolate to melt and bind with the graham crackers.
Describe the texture of a marshmallow.
Marshmallows are chewy, airy, and fluffy, with a texture that's unlike any other candy
Explain why melting chocolate is a physical change.
Melting chocolate is considered a physical change because when chocolate melts, it only changes its state from solid to liquid, without altering its chemical composition
What physical properties can you identify in melted chocolate?
melting point
How does the weight of a graham cracker affect its extensive properties?
It did not change its physical state it is still solid.
Why does density remain constant in a substance regardless of amount?
Density remains constant in a substance regardless of the amount because it is an "intensive property," meaning it depends only on the composition of the substance, not the quantity present
How does the color of a graham cracker relate to its physical properties?
The color of a graham cracker, typically a light brown, is directly related to its physical properties as it indicates the presence of whole wheat flour
Describe how the size of a s'more changes during the cooking process.
the more surface area a food has, the faster it cooks (more surface area means greater exposure to heat and more contact with heat)
Describe how the aroma of a s'more can impact its appeal.
Odors direct food choice and stimulate sensory-specific appetites
Why is mass considered an extensive property?
Mass is considered an extensive property because its value directly depends on the amount of matter present in a system
Explain how the boiling point is an intensive property of water.
The boiling point of water is considered an intensive property because it does not depend on the amount of water present