Energy Transformation in the Body

Physical change

• the appearance or form changes but the substance remains the same.

• the rearrangement of a substance or material that alters its chemical composition or properties. Usually results in a new substance being made.

Chemical change

• the appearance or form changes but the substance remains the same.

• the rearrangement of a substance or material that alters its chemical composition or properties. Usually results in a new substance being made.

Select all the options that are examples of physical change.

• chewing

• phase change (changing states of matter)

• peristalsis

• mechanical digestion

• fire burning

Select all that are examples of chemical change.

• enzymes breaking down food

• chewing

• mechanical digestion

• melting/freezing

• peristalsis

Enzymes breaking down food is what kind of change?

• Chemical

• Physical

• Mechanical

• Potential

Chemical digestion results in...

• chemical change

• physical change

• mechanical change

Energy...

• allows an organism to do work

• energy of an object or organism due to its motion or movement.

• energy given off in the form of heat energy.

• stored in chemical bonds and is released through the process of digesting or breaking down food.

• energy that comes from the Sun.

Mechanical energy is...

• allows an organism to do work

• energy of an object or organism due to its motion or movement.

• energy given off in the form of heat energy.

• stored in chemical bonds and is released through the process of digesting or breaking down food.

• energy that comes from the Sun.

Thermal energy is...

• allows an organism to do work

• energy of an object or organism due to its motion or movement.

• energy given off in the form of heat energy.

• stored in chemical bonds and is released through the process of digesting or breaking down food.

• energy that comes from the Sun.

Chemical energy is...

• allows an organism to do work

• energy of an object or organism due to its motion or movement.

• energy given off in the form of heat energy.

• stored in chemical bonds and is released through the process of digesting or breaking down food.

• energy that comes from the Sun.