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ROAD MAP:

1- Lesson overview

2- Pre-assessment

3- Investigate

4- Individual Work (Scientists)

6- Choice board

7- Post-assessment

8- Reflection

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Objectives:

Identify the characteristics of endothermic and exothermic reactions, including examples and the role of energy transfer.

Analyze temperature changes in a chemical reaction to determine whether it is endothermic or exothermic based on observational data.

Investigate the process of thermal energy absorption or release by conducting experiments that demonstrate endothermic and exothermic reactions.

Terminologies:

Endothermic Reaction

Exothermic Reaction

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Which of the following does NOT represent a balanced chemical equation?

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You burn Methane gas CH4 with oxygen in air O2 in a closed container. You notice heat is being released.

Question:
the combustion of methane release or absorbs heat, and what implications does this have for energy use in everyday life?

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Use the simulation to answer the following questions:

https://gizmos.explorelearning.com/find-gizmos/lesson-info?resourceId=1083

1- which chemical increases Temperature, decreases temperature?

2- What does the term "endo" or 'exo' mean in a chemical reaction?

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What happens during an exothermic reaction?

A) Energy is absorbed, and the temperature decreases.
B) Energy is released, and the temperature increases.
C) No energy changes occur; everything stays the same.
D) The reaction only involves mixing substances.

Scenario:
You conduct an experiment by mixing ammonium nitrate (NH₄NO₃) with water. After mixing, you notice that the solution feels cold to the touch, and the temperature of the mixture decreases.

Question:
What do these observations indicate about the type of reaction taking place? Do you think this is an endothermic reaction? Explain your reasoning.

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You mix two liquids, and after a few minutes, a solid forms at the bottom, the temperature decreases, and gas bubbles are released.

Questions:

1. What do you think is happening?

What does the solid and the gas indicate about the reaction?

2. How can you tell if a chemical reaction has occurred?

What signs show that a chemical change has taken place?

3. What evidence supports your answer?

How do the temperature change and the formation of solid and gas indicate a reaction?

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Scenario:

A student conducts two experiments:

1. Experiment 1: Solid ammonium nitrate (NH₄NO₃) is mixed with water in a calorimeter. The temperature of the solution decreases, and the solution feels cold to the touch.

2. Experiment 2: Solid calcium chloride (CaCl₂) is mixed with water, and the temperature of the solution increases, making the solution feel warm.

Question:

Using the Law of Conservation of Energy, explain what is happening at the molecular level during these reactions. Identify which reaction is endothermic and which is exothermic, and describe the energy changes involved. How do the temperature changes and sensory observations (feeling cold or warm) support your conclusions? Additionally, discuss how these types of reactions are applied in real-world scenarios, such as in cold packs or heating pads.

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When a chemical reaction causes the surroundings to feel cold, what does this indicate?

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The reaction is exothermic because it releases heat.

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B) The reaction is endothermic because it absorbs heat

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C) The reaction produces no energy change.

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IXL | Describe energy changes in chemical reactions | 8th grade science

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Improve your science knowledge with free questions in “Describe energy changes in chemical reactions” and thousands of other science skills.

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1. What did I learn?

2. What was the most challenging part?

3. What can I improve next time?

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Why does the combustion of methane release heat, and what implications does this have for energy use in everyday life?

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Why does the combustion of methane release heat, and what implications does this have for energy use in everyday life?

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The combustion of methane releases heat because breaking and forming new bonds in the reaction releases energy. This energy is useful for heating, cooking, and generating electricity in everyday life, but it also releases carbon dioxide, which impacts the environment.