2-3: Energy & MatterIdentify forms of energy that are related to

changes in matter.

Anticipatory Set

Does this ball have energy?

Does this ball have energy?

Where did it come from?

California StandardsScience Standard 8.5.c: Students

know chemical reactions usually liberate heat or absorb heat.

Inputenergy: ability to do work or cause change.temperature: measure of the average

energy of random motion of particles of matter.

thermal energy: the total energy of all the particles in an object.

endothermic change: change in which energy is taken in (melting of ice).

exothermic change: releases energy (warming hands by the fire).

Inputchemical energy: energy stored in the

chemical bonds between atoms.electromagnetic energy: a form of energy

that travels through space as waves.electrical energy: energy of electrically

charged particles moving from one place to another.

electrode: metal strip that conducts electricity.

InputForms of Energy

Thermal EnergyChemical EnergyElectromagnetic EnergyElectrical Energy

Transforming Energy*

Comparing Energy ChangesA student observes two different chemical reactions, one in beaker A, and the other in beaker B. The student measures the temperature of each reaction every minute. The student then plots the time and temperature data and creates the following graph.

Input & Modeling

Input & Modeling

Comparing Energy Changes

The experiment lasted for 10 minutes.

Reading Graphs:

What do the numbers on the x-axis tell you about the length of the experiment?

Input & Modeling

Comparing Energy Changes

The temperature decreased in beaker B, but increased in beaker A.

Comparing and Contrasting:

How did the change in temperature in beaker B differ from that in beaker A?

Input & Modeling

Comparing Energy Changes

Reaction A is exothermic because thermal energy was released, causing an increase in temperature.

Interpreting Data:

Which reaction is exothermic? Explain your reasoning.

Input & Modeling

Comparing Energy Changes

Reaction A

Calculating:

Which reaction results in a greater change in temperature over time?

What is the ability to do work or cause change?

Check forUnderstanding

energyThermal, Chemical, _______

& Electromagnetic are the forms of energy.

Electrical

Answer #1, 3, 6, 7

Guided Practice

Independent PracticeFinish the worksheet.

HOMEWORK EXTENSION Write a detailed SUMMARY of the section and

complete the UNANSWERED QUESTIONS section of your notes.

Choose two of the remaining Depth & Complexity ICONS in your notes and explain how they relate to this section.