investigation 5 - energy transfer 8th grade chemical interactions

Investigation 5 - Energy Transfer8th Grade

Chemical Interactions

Water Mixing Review

What happened to the cold water when it was mixed with the hot water?

What happened to the hot water when it was mixed with the cold water?

Water Mixing ReviewWhat happened to the kinetic energy of the

particles in the hot water when the hot and cold water mixed?

What happened to the kinetic energy of the particles in the cold water when the hot and cold water mixed?

Water Mixing ReviewThe hot water particles had high kinetic

energy.

The cold water particles had low kinetic energy.

We mixed hot and cold water to make warm water.

Water Mixing Review

The average kinetic energy of the warm water particles was medium.

The kinetic energy of the hot water particles and cold water particles changed when they were mixed.

Water Mixing ReviewEquation for finding the average kinetic

energy level:

Tf = Th + Tc

2

Temperature Change

Heat moved from hot water to cold water. The kinetic energy changed.

The two waters blended: Hot + Cold = Medium.

Temperature Change

Heat moved from hot water to cold water. The kinetic energy changed.

The two waters blended: Hot + Cold = Medium.

Energy TransferThe movement from one place to another is

called energy transfer.

Sometimes matter gets hot as a result of energy transfer.

Sometimes matter gets colder as a result of energy transfer.

Energy Transfer

Change of temperature is

evidence of energy transfer.

Energy TransferImportant Idea #1:

The particles that make up matter are in constant motion. As a result, particles have high kinetic energy.

The level of kinetic energy of the particles in a sample of matter determines how hot it is.

Kinetic energy = HeatThe greater the kinetic energy of the particles

in a sample of matter, the hotter it is.

Energy TransferImportant Idea #2:

Energy transfers as a result of particle collisions.

When fast-moving particles collides with a slow-moving article, the one that was going fast slows down, and the one that was going slow speeds up.

Energy TransferImportant Idea #2 Continued:

Energy transfers between particles when they collide.

Energy TransferImportant Idea #2 Continued:

Energy transfer that results from collisions is called conduction.

Energy TransferImportant Idea #3:

Energy always moves from higher energy (hot) to lower energy (cold). ALWAYS.

Energy TransferSummary:

Kinetic Energy = Heat

Energy transfers between particles when they collide.

Energy always transfers from hot to cold.

Energy Transfer PracticeFoss Web Multimedia:

Energy Transfer by CollisionMixing Hot and Cold Water

http://www.fossweb.com/

Celsius ThermometerA thermometer is a tool measures

temperature.

Temperature is the average kinetic energy of the particles of a substance.

Temperature is measured in degrees.

Celsius is one way to measure the average kinetic energy of the particles in a substance.

Celsius Thermometermailto:http://www.fossweb.com/modulesMS/k

it_multimedia/login.php%3Frequest=/modulesMS/kit_multimedia/ChemicalInteractions/