Chemical Reactions Notes
Directions
1. Attach this paper to notebook page 39.
2. Carefully read pages 28-31 in the “Interactions of Matter” textbook.
3. Complete the notes below by filling in the blanks. I have already determined the Main Ideas for these notes. Under each Main Idea, develop at least 1
question. (7 Main Ideas = 7 questions) There is space at the very bottom for a summary. Make sure it’s approximately 5 sentences long.
4. Create at least 4 flashcards. If you do not remember how to make flashcards, look in your old notebook. Put the flashcards in the pocket you created
at the back of your notebook.
Main Idea/Question
1. Chemical Reaction
Detailed Notes/Answer to Question
1. A. (Definition) - describes matter based on _______________________________
_______________________________________________________________
B. Compounds form new substances and are involved in chemical reactions.
C. The chemical and physical properties of the new substances ________________
_______________________________________________________________
D. Examples: (Figure 1)
1. ___________________________________________________
2. _______________________________________________________
2. Signs of reactions
2. A. Some signs that a chemical reaction has occurred (Figure 1)
1. Form _______________________
2. Form a _________ “_________________”
“Precipitate” - __________________________________________________
3. ____________ is given off (examples: _________, ___________, __________)
4. Change in ___________ (Identify remaining sign using Figure 2)
B. Reading these signs
1. Reactions often have __________________________________
2. The more signs you see, the _________________________________________
3. Even though the signs are good signals that a chemical reaction is taking place,
they do not ______________________________________________________
C. The most important and reliable sign that a chemical reaction is taking place:
1. Formation of _____________________________________________________
2. Properties of the new substances are __________________________________
3. Chemical Bond
3. A. (Definition) - _____________________________________________________
B. For a chemical reaction to take place, the original bonds must _______________
_______________________________________________________________
C. The process of forming a new substance through a chemical reaction:
1st The starting substances’ chemical bonds must ___________.
This happens when molecules _____________________________________
with enough energy to ______________________.
2nd The atoms ____________ forming _______________ and ______________
Carefully read pages 42-43 in the “Interactions of Matter” textbook then complete the notes below.
Main Idea/Question
Detailed Notes/Answer to Question
4. Chemical Energy
4. A. Chemical energy is part of all _______________________________
B. Energy is needed to _______________________________________
“reactants” – the starting substances in a chemical reaction
C. Energy is released as _______________________________________
“products” – the new substances formed in a chemical reaction
D. Able to determine if energy is released (given off) or absorbed (taken in)
by comparing the chemical energy of the ____________ with the ____________
5. Exothermic Reaction 5. A. (Definition) a chemical reaction in which ______________________________
B. Types of energy that can be released in an exothermic reaction: (Figure 1)
1. ____________________
2. ____________________
3. ____________________
6. Endothermic Reaction 6. A. (Definition) a chemical reaction in which ______________________________
B. Example: ____________ because ____________________________________
7. Law of Conservation
of Energy
7. A. (Definition) energy can not be ______________________________________
B. But, energy can ______________________ as it is transferred from one
substance to another.
Carefully read pages 42-43 in the “Interactions of Matter” textbook then complete the notes below.
Main Idea/Question
Detailed Notes/Answer to Question
4. Chemical Energy
4. A. Chemical energy is part of all _______________________________
B. Energy is needed to _______________________________________
“reactants” – the starting substances in a chemical reaction
C. Energy is released as _______________________________________
“products” – the new substances formed in a chemical reaction
D. Able to determine if energy is released (given off) or absorbed (taken in)
by comparing the chemical energy of the ____________ with the ____________
5. Exothermic Reaction 5. A. (Definition) a chemical reaction in which ______________________________
B. Types of energy that can be released in an exothermic reaction: (Figure 1)
1. ____________________
2. ____________________
3. ____________________
6. Endothermic Reaction 6. A. (Definition) a chemical reaction in which ______________________________
B. Example: ____________ because ____________________________________
7. Law of Conservation
of Energy
7. A. (Definition) energy can not be ______________________________________
B. But, energy can ______________________ as it is transferred from one
substance to another.
Summary
KEY
Chemical Reactions Notes
Main Idea/Question
?
1. Chemical Reaction
Detailed Notes/Answer to Question
1. A. (Definition) - describes matter based on a process in which one or more
substances change to make one or more new substances
B. Compounds form new substance so are involved in chemical reactions.
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C. The chemical and physical properties of the new substances differ from
those of the original substances
D. Examples: (Figure 1)
1. Leaves change color during Fall.
2. Making muffins by mixing and baking the ingredients.
2. Signs of reactions
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2. A. Some signs that a chemical reaction occurred (Figure 1)
1. Form gas bubbles
2. Form a solid “precipitate”
“Precipitate” – a solid substance that is formed in a solution
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3. Energy is given off (examples: light, heat, electrical)
4. Change in color (Identify remaining sign using Figure 2)
B. Reading these signs
1. Reactions often have more than one of these signs
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2. The more signs you see, the more likely a chemical reaction is taking place
3. Even though the signs are good signals that a chemical reaction is taking place,
they do not guarantee that a reaction is happening
C. The most important and reliable sign that a chemical reaction is taking place:
?
1. Formation of new substances that have different properties
2. Properties of the new substances are different from the starting substance
3. Chemical Bond
?
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3. A. (Definition) – a force that holds two molecules together in a molecule
B. For a chemical reaction to take place, the original bonds must break and
new bonds must form
C. The process of forming a new substance through a chemical reaction:
1st The starting substances’ chemical bonds must break.
?
This happens when molecules bump into each other
with enough energy to break their bonds.
2nd The atoms rearrange forming new bonds and new substances
Carefully read pages 42-43 in the “Interactions of Matter” textbook then complete the notes below.
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Main Idea/Question
Detailed Notes/Answer to Question
4. Chemical Energy
4. A. Chemical energy is part of all chemical reactions
B. Energy is needed to break down bonds in reactants
?
“reactants” – the starting substances in a chemical reaction
C. Energy is released as new bonds form in the products
?
“products” – the new substances formed in a chemical reaction
D. Able to determine if energy is released (given off) or absorbed (taken in)
?
by comparing the chemical energy of the reactants with the products
5. Exothermic Reaction 5. A. (Definition) a chemical reaction in which energy is released
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B. Types/forms of energy that can be released in an exothermic reaction: Figure 1
1. Light energy
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2. Electrical energy
3. Light and thermal (heat) energy
6. Endothermic Reaction 6. A. (Definition) a chemical reaction in which energy is taken in
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B. Example: photosynthesis because it needs the suns energy to happen
7. Law of Conservation
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of Energy
7. A. (Definition) energy can not be created or destroyed
B. But, energy can change forms as it is transferred from one
substance to another.
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Summary: Summarize the information above without listing definitions. Explain how the terms are connected.
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