1. 2.01 PowerPoints There are 3 PowerPoints in this packet. Matter
Physical Changes
Energy & Heat Transfers
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2. Matter
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3. Matter A pure substance or a mixture
Composed of one or more elements that are displayed on the periodic table
The periodic table; a tabular way to display all known chemical elements
To provide a framework to classify and compare chemical elements
Food is matter
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4. Food is matter-A pure substance or mixture
Physical Changes
Food is matter-A pure substance or mixture

5. Physical properties
Thermodynamics -- effect of change in temperature, pressure, and volume (canning)
Heat transfer -- the passage of thermal energy from a hot to a cold body (cooking and cooling)
Microwave -- passing microwave radiation through food and water, fat, and sugar so they absorb energy (cooking)
Texture
Appearance
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6. Why study physical changes?
Physical changes are crucial in:
Product development
Process design
Shelf life
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7. Physical changes to matter
Physical changes to matter involve:
Changing shape/size – crushing ice
Changing temperature – boiling ice
Changing phase – melting ice
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8. Changing its Shape or Size
Chopping
Slicing
Mashing
Grinding
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9. Changing the Temperature
Change the temperature of matter without changing its chemical identity – heating and cooling.
Examples include pasteurization and rapid cooling.
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10. Changing Phase: Three states of matter are:
Solid -- ice
Liquid -- water
Gas – steam
Physical change in the state of matter that does not change the molecular structure.
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11. Changing Its Phase
Phase is a physical change in state of matter that does not change the molecular structure.
The three states of matter – solid, liquid, and gas.
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12. Energy and Heat Transfer

13. What Is Energy? Types of energy Mechanical Chemical Electrical Radiant
Nuclear
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14. Mechanical Energy What makes a machine to perform work.
Examples include:
Hand mixers
Water wheel
Flour mill
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15. Chemical Energy
As bonds break or form between atoms, chemical energy is generated.
Examples include:
Using ice and salt to make ice cream.
Digestion of foods.
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16. Electrical Energy Movement of electrons
Transported through wires to where needed.
Easily changed to heat or mechanical energy.
Examples include:
Electrical home appliances – stove, refrigerator, dishwasher
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17. Radiant Energy
Energy transmitted in the form of waves through space or some medium.
Examples:
Microwave oven
Sun
Charcoal grills
Gas flames
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18. Nuclear Energy
Splitting or combining atoms of certain elements which give off radiation.
Examples:
X-rays in medicine
Nuclear power
Irradiation – food preservation
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19. What Is Heat?
Definition – An energy transfer from one body to another caused by a temperature difference between the two bodies.
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20. Three Ways Heat is Transferred
Conduction
Convection
Radiation
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21. Conduction Heat (or energy) is transferred by molecular collisions.
Example:
Cooking foods in an oven.
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22. Convection
Heat (energy) is transferred through molecular collisions and and currents.
Heat (energy) is more rapid than conduction.
Example:
Food cooked in boiling water.
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23. Radiation Heat (energy) is transferred by light waves through space.
Examples:
Sunlight
Microwave
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24. A Matter