Matter and Energy (page 17 of Scientific Notebook)

OBJECTIVES Understand how energy is involved in physical/chemical changes of matter.

Become familiar with the law of conservation of energy.

Understand the difference between heat and energy.

SPI’s and CLE’s:

CLE 3221.2.1 Investigate the characteristic properties of matter.

CLE 3221.2.2 Explore the interactions between matter and energy.

What is Energy? Energy is the capacity to do some type of

work.

What is work?

Moving an object Forming a new compound Generating light Converting food to usable energy

Energy is used when there is any change in matter.

What are the two ways matter can change?

PHYSICAL – no change in substance

CHEMICAL – new substance is made

Matter Changes

In order for anything to change, whether it is chemical or physical energy must be supplied. (Arrow Indicate Energy)

BOILING WATERBOILING WATER

EVAPORATIONEVAPORATION

ICEICE

WATERWATER

What are endothermic and exothermic processes?

Endothermic- process in which heat is absorbed.

Exothermic- process in which heat is released.

What is the Law of Conservation of Energy?

The Law That States That Energy Cannot Be Created or Destroyed but can be changed from one form to another.

Energy can exist in different forms.

Chemical Mechanical Light Heat Electrical sound

Check For Understanding

Example Energy In Energy Out

Blender

Gas Powered Grill

Electric Pencil Sharpener

Game Controller

Transformation of Energy

Example Energy In Energy Out

Blender Electrical Mechanical

Gas Powered Grill

Chemical Heat

Electric Pencil Sharpener

Electrical Mechanical

Game Controller Mechanical Eletrical

What are heat, temperature, and specific heat?

Heat- the energy transferred between objects.

Temperature- actual measurement of energy (heat), or how hot or cold something is.

Specific heat- the relationship between the energy transferred to a substance and the substance’s temperature change.

What are temperature scales?

Thermometers are used to measure temperature.

Thermometers are marked with different temperature scales.

3 basic types: Kelvin, Celsius, Fahrenheit

Calculations(page 18 of Scientific Notebook)

Converting between temperature scales(K- oC)

t( oC) = T(K) – 273.15 K

t(K) = t( oC) + 273.15 oC

Calculations(page 18 of Scientific Notebook)

Converting between temperatures(oF- oC)

t(o C) = (5/9)(oF – 32)

t(oF) = (9/5)(oC + 32)

Guided Practice

Convert 100 degrees Celsius to Kelvin.

Convert 100 degrees Kelvin to Celsius

Independent Practice(turn in for a grade)

Convert 200 degrees Celsius to Kelvin.

Convert 32 Kelvin to degrees Celsius.

Convert 15 degrees Celsius to Kelvin.

Homework

Convert 150 degrees Celsius to Kelvin

Convert 20 degrees Celsius to Kelvin

Convert 50 degrees Kelvin to Celsius

Convert 10 degrees Kelvin to Fahrenheit

Closure:

Name the 3 temperature scales as you leave the room.