Author/s: Orvielle Atanacio, Sam Daniel Erasga, Julius Harvey Mercado, Kimberly Ibañez, Elspeth Yssabelle Mendoza, Zydelle Aliyah Peñaflor, and Kyla Ursula
Write a reflection on lesson 4.
Lesson 4 is about Stoichiometry, and this lesson is composed of 3 sections: section 1 is all about "mole concept", section 2 is about "balancing equation and different types of chemical reaction" and section 3 is about "mass relationship and chemical reaction". Counting atoms using relative mass can be related to real-life situations especially to the chemist were in according to the PowerPoint presentation of our teacher in chemistry, chemists want to know the number of atoms, ions, or molecules because these are the ones that react with each other. We also learned it well because our teacher applies the concept of relative mass to an object where we can easily imagine the object even without the illustration because we are very familiar with the object. He uses the rice grain and the mongo bean which are easier to imagine than atoms. We saw how he compare the rice grain and the mongo bean to each other by calculating their number or their masses.
One more thing that we learned about the mole concept is that it helped us improve our skills to balance the equation and how to convert the number of grams of compounds. This lesson helped us understand the chemical reaction (the process of breaking of chemical bonds in one or more substances, and the reforming of new bonds to create new substances). In addition, we learned about the different types of chemical reactions. The first type of chemical reaction is synthesis it occurs when two substances (generally elements) combine and form a compound. (Sometimes these are called combination or addition reactions.). The second combustion occurs when a hydrocarbon reacts with oxygen gas. The third is the position, it occurs when a compound breaks up into elements or in a few to simpler compounds. Lastly replacement, two types the single replacement and double replacement. Single replacement occurs when one element replaces another in a compound (a metal can replace a metal (+) OR a nonmetal can replace a nonmetal (-). Furthermore, we learned how to identify a reaction which we need to become more systematic because it will help us to identify the reaction type and the product.
In Stoichiometry, we recognize that a balanced chemical equation has equal numbers of atoms of each element involved in the reactant and product sides. Also, we understand that a mass relation refers to the ratio of the mass reactants and products to each other. We realized that having an understanding of the different types of chemical reaction will be useful for predicting the products of an unknown reaction. Moreover, we learned that applying coefficient in balanced chemical equations can determine the quantities of reactants and products. The activities that our teacher gave us was very helpful because it developed our skills not only in analyzing the problem but also it helped improve our skills in solving. After all, this lesson has a lot of solving problems. This lesson is very enjoyable because there are a lot of activities and energizers given by our teacher and I hope that in the next lesson we can apply the topic that we learned about lesson 4 which is stoichiometry. Our teacher had fun activities where he gives riddles for us to analyze and answer.
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