Types of Chemical Reactions

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Summary:

How are some chemical reactions different than others? There are four major types of chemical reactions. These include synthesis, decomposition, single displacement and double displacement. These types of chemical reactions show what happens to the molecules in the chemical reaction and how they are rearranged in various different ways. 

The first type of chemical reaction is Synthesis. Synthesis is when two different molecules join together to create one larger molecule. For example, Na + Cl → NaCl. In that chemical reaction, the sodium and chlorine joined and created sodium chloride or table salt. 

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Another type of chemical reaction is decomposition, which is the opposite of synthesis. One compound breaks up into each element that made up that molecule. An example of decomposition would be this formula: 2H₂O₂ → 2H₂O + O₂. In this chemical reaction, two hydrogen peroxide molecules broke down into one oxygen molecule and two water molecules.

The third type of chemical reaction in Single displacement. Single Displacement is when a molecule "takes" one of the elements in another molecule, leaving the other element on its own. In the image above, the example is AB + C → AC + B. Oon the product side, the element A from the molecule AB joined C to become AC, leaving B "displaced."

The final type of chemical reaction is Double Displacement, which is when the elements in two molecules are switched around and rearranged in a different way. Here is a general example: AB + CD → AC +BD. As you can see, the elements B and C got displaced and rearranged to become a new molecule. Even though the elements are the same, the way that they are placed makes them a different molecule.

SP3: Planning and Carrying Out Investigations

In class, we conducted various experiments and investigations in order to figure out and learn more about endothermic and exothermic reactions based on the temperature of the cup in which the reaction is happening. We identified the type of reaction by using our senses (change in color, bubbling/not bubbling) and tools (thermometer, graduated cylinder.) This has helped us understand what the various different types of reactions look like and how to understand what makes them react differently. We also collected data in our table where we took notes on our findings and discoveries.

XCC: Systems and System Models

This week in class, I noticed and identified chemical reactions and how they are modeled by showing the types of reactions in chemical equations. The different types of chemical reactions that are displayed in equations all relate to each other because they still have the parts of the system including the coefficients, subscripts, yield, and more. The function of chemical equations helps us understand what happens in a chemical reaction in a way that is easy to understand and follow what is happening. Understanding this system and how it is modeled can help me learn more about what happens in a chemical reaction.

Multiplier

This week, I was a wanderer. As we conducted experiments, I shared my findings and ideas with my group. When I thought of a new idea or learned something new, I made sure to share that piece of information. When I needed help with a part of the worksheet and assignments, we worked together and shared our ideas to complete the investigation with full understanding of what happened in that chemical reaction and how that would be displayed with a chemical reaction.