physical behavior of matter.....aim 7

what are the different forms of energy?

.....aim 6

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aim 8.....

 

MU #1 Energy can exist in different forms, such as chemical, electrical, electromagnetic, thermal, mechanical, and nuclear. 

 

Chemical energy

Energy absorbed or released during a chemical reaction.

Example

The burning of wood releases energy.

 

Electrical energy

The energy associated with the movement of electrons.

Example

 

Electromagnetic energy

Energy associated with electromagnetic radiation.

 

Mechanical energy

Energy associated with motion of objects

Example

A falling rock, a moving car, etc.

 

Nuclear energy

Energy associated with fission or fusion

 

 

Thermal energy is the energy associated with the random motion of atoms and molecules.

 

 

MU #2 Temperature is a measurement of the average kinetic energy of the particles in a sample of material. Temperature is not a form of energy.

Example

 

MU #3 Heat is a transfer of energy (usually thermal energy) from a body of higher temperature to a body of lower temperature. 

 

The Law of Conservation of Energy states that energy cannot be created nor destroyed but is converted from one form to another.

 

TEST YOUR UNDERSTANDING

1. Solid A at 80 C is immersed in liquid B at 60 C. Which statement correctly describes the energy changes between A and B?

            1. A releases heat and B absorbs heat.  3. Both A and B absorb heat.

            2. A absorbs heat and B releases heat.  4. Both A and B release heat.

2. Which sample of Fe contains particles having the highest average kinetic energy?

(1) 5 g at 10oC             (2) 10 g at 25oC           (3) 5 g at 400 K           (4) 10 g at 300 K

6/02

Which change in the temperature of a 1-gram sample of water would cause the greatest increase in the average kinetic energy of its molecules?         (1) 1oC to 10oC       (2) 10oC to 1oC        (3) 50oC to 60oC      (4) 60oC to 50oC

1/03

An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in

        (1) concentration     (2) temperature             (3) pressure                (4) volume

6/04

15 The average kinetic energy of water molecules is greatest in which of these samples?
        (1) 10 g of water at 35°C (2) 10 g of water at 55°C (3) 100 g of water at 25°C (4) 100 g of water at 45°C

1/05

16 Which form of energy is converted to thermal energy when propane burns in air?

                (1) electromagnetic (2) nuclear (3) electrical (4) chemical

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