ALEX Classroom Resource

  

Energy Changes in Chemical Reactions

  Classroom Resource Information  

Title:

Energy Changes in Chemical Reactions

URL:

https://www.middleschoolchemistry.com/lessonplans/chapter6/lesson7

Content Source:

Other
American Chemical Society
Type: Lesson/Unit Plan

Overview:

In this lesson, students will conduct two chemical reactions. In the first, the temperature will go down (endothermic), and in the second, the temperature will go up (exothermic). Students will see an animation to show that it takes energy to break bonds and that energy is released when new bonds are formed. Students will use this idea to explain why a reaction is either endothermic or exothermic.

Students will be able to define an endothermic and exothermic reaction. Students will be able to use the concept of energy in bond breaking and bond making to explain why one reaction can be endothermic and another reaction can be exothermic.

Content Standard(s):
Science
SC2015 (2015)
Grade: 8
Physical Science
4 ) Design and conduct an experiment to determine changes in particle motion, temperature, and state of a pure substance when thermal energy is added to or removed from a system.


NAEP Framework
NAEP Statement::
P12.5: Changes of state require a transfer of energy. Water has a very high specific heat, meaning it can absorb a large amount of energy while producing only small changes in temperature.

NAEP Statement::
P12.8: Atoms and molecules that compose matter are in constant motion (translational, rotational, or vibrational).

NAEP Statement::
P8.1: Properties of solids, liquids, and gases are explained by a model of matter that is composed of tiny particles in motion.

NAEP Statement::
P8.6a: Changes of state are explained by a model of matter composed of tiny particles that are in motion.

NAEP Statement::
P8.6b: When substances undergo changes of state, neither atoms nor molecules themselves are changed in structure.

NAEP Statement::
P8.6c: Mass is conserved when substances undergo changes of state.


Unpacked Content
Scientific And Engineering Practices:
Planning and Carrying out Investigations
Crosscutting Concepts: Systems and System Models
Disciplinary Core Idea: Matter and Its Interactions
Evidence Of Student Attainment:
Students:
  • Design an experiment to determine changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed from a system.
  • Conduct an experiment to determine changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed from a system.
Teacher Vocabulary:
  • Particle motion
  • Temperature
  • State [of Matter]
  • Pure substance
  • Thermal Energy
  • Kinetic Energy
  • System
Knowledge:
Students know:
  • Changes in particle motion of a pure substance occur when thermal energy is added to or removed from a system.
  • Changes in temperature of a pure substance occur when thermal energy is added to or removed from a system.
  • Changes in state of a pure substance occur when thermal energy is added to or removed from a system.
Skills:
Students are able to:
  • Identify the phenomena under investigation, which includes changes in particle motion, temperature, and state of a pure substance when thermal energy is added to or removed from a system.
  • Identify the purpose of the investigation, which includes determining changes in particle motion, temperature, and state of a pure substance when thermal energy is added to or removed from a system.
  • Develop a plan for the investigation individually or collaboratively.
  • Describe factors used in the investigation including appropriate units (if necessary), independent and dependent variables, controls and number of trials for each experimental condition.
  • Perform the investigation as prescribed by the plan.
  • Use data from the investigation to provide an causal account of the relationship between the addition of removal of thermal energy from a substance and the change in the average kinetic energy of the particles in a substance.
Understanding:
Students understand that:
  • Adding or removing thermal energy from a system causes changes in particle motion of a pure substance.
  • Adding or removing thermal energy from a system causes changes in temperature of a pure substance.
  • Adding or removing thermal energy from a system causes changes in state of a pure substance.
AMSTI Resources:
AMSTI Module:
Exploring the Properties of Matter

Alabama Alternate Achievement Standards
AAS Standard:
SCI.AAS.8.4- Recognize that changes in temperature can cause changes in the state of matter of a substance; recognize that these changes are a result of changes in particle motion.


Tags: bond, chemical reaction, endothermic, energy, exothermic, heat, substance, temperature
License Type: Custom Permission Type
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  This resource provided by:  
Author: Stephanie Carver