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While teaching a chemical formula may seem a bit complex for 5th graders, most students caught on to the concept I was trying to teach. I love watching and listening to the students as they test the rule, the number of atoms you start with is equal to the number of atoms you end up with , to see if it always works. One student says, "It doesn't work with oxygen.
There's 5 oxygen atoms to begin with and then 4 oxygen atoms at the end. I ask students to write a paragraph, explaining what the Law of Conservation is and how their investigations prove that the beginning mass and ending mass always stays the same with physical and chemical reactions. As students write, I invite them to share their paragraphs out loud to help support and inspire other students.
This is also a great way to recognize students and to provide immediate feedback. Here are a few examples of finished paragraphs: Student Paragraph Examples. Empty Layer. Home Professional Learning. Professional Learning. Learn more about. Sign Up Log In. Chemical Reactions Add to Favorites 63 teachers like this lesson. Big Idea In this lesson, students examine how mixing baking soda and vinegar results in new substances. They also discover that the beginning and ending mass of this chemical reaction remains the same.
Grade Level. Matter and its Properties. Chemical Reactions and Balancing. Law of Conservation of Mass.
SP1 Asking questions for science and defining problems for engineering. Lesson Overview. Focus 2. Explore 3. Reflect 4. Unit Explanation In this unit, students will begin by exploring the properties of matter. Summary of Lesson Today, I open the lesson by introducing the Law of Conservation using a class poster.
Crosscutting Concepts. Focus 40 minutes.
Teacher Note: This is a lengthy lesson that can be separated into two lessons! Matter Unit Lapbooks To provide students with a method to keep track of their research and thinking during our unit on matter, I followed these steps to create lapbooks for each student. Law of Conservation Poster Today is the perfect day to introduce the Law of Conservation to students.
Meaning of Mass Then, we review the word, mass. Examples of Physical Changes To help students make sense of this new scientific concept, I don't waste any time connecting it to familiar examples of physical changes. Discussing Chemical Changes Now that we've discussed how the Law of Conservation works with physical changes, what question are you pondering?
Explore 50 minutes. Investigation Template The class discusses and completes a new investigation template in their lapbooks. I provide some final directions before students start investigating. Make sure to wear your safety goggles at all times. Now looking back at my videos of this lesson, I realize that many students forgot this step.
Please use the digital scale closest to your group when finding the mass before and after the reaction. Once it is sealed, you will not be opening the bag again today. Law of Conservation Poster. Sharing Findings Now that students have built meaning and understanding by observing, questioning, and exploring, it is important to provide students with the opportunity to share their findings. We discuss how these measurements are about the same and how the placement of the bag on the scale or a leaky bag could affect the end results.
The reaction bubbled and the bag filled up with air. Writing Conclusions The class takes a few minutes to complete the conclusion section of their investigation template Chemical Reaction Student Investigation. Previous Lesson. Next Lesson. At this stage it is important that students are encouraged to put up their ideas and discuss them in small groups. All alternatives should be considered with no resolution at this stage.
A starting activity could be observing the burning of a candle and discussing the changes that take place. Here the distinction can be made between the melting of the wax and the appearance of new materials. Questions posed could include:. Activities which provide problems to be explored and challenge existing ideas are useful in encouraging students to seek new explanations for things they observe.
Students should investigate a number of changes and ask questions similar to those above. In all of these students should be encouraged to observe the changes that take place and to identify what products are formed. Discussion can also centre on how these are different from the starting materials. Some examples could include:. Other activities can involve chocolate making. There are many other similar chemical changes that can be investigated - further cooking activities can include: making a chocolate cake, melting and browning cheese, making honeycomb, baking bread, poaching eggs and making toast.
Other changes can include the setting of two component glues like Araldite and mixing steel wool and a solution of copper sulfate available from plant nurseries. Oxygen is a very important reactant in many chemical reactions and students can investigate changes involving this component of air. It is important at this stage to clarify and consolidate what students have observed and to focus on what happens in a chemical reaction which is different from melting, boiling and freezing. To achieve this students could be asked in groups to make mini posters which show the changes that take place in the one or more of the reactions they have seen, particularly comparing the products with the starting materials and demonstrating how they are different.
Students then present their posters to the class. Resulting class discussion should bring out student ideas, examine alternatives and move to more accepted scientific views about chemical reactions. Activities should be carried out which test the usefulness of the chemical reactions model and further consolidate student ideas about what constitutes a chemical reaction.
Students can be further encouraged to compare the products with the starting materials. To further develop students' appreciation of the role of chemical change in their lives, they could research the production of metals from ores such as aluminum and steel or the production of plastics and synthetic fibres.
The identification of oxygen in the 18th century by Swedish chemist Carl Wilhelm Scheele and English clergyman Joseph Priestley had particular significance.
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The influence of French chemist Antoine-Laurent Lavoisier was especially notable, in that his insights confirmed the importance of quantitative measurements of chemical processes. Among his many discoveries, Lavoisier accurately measured the weight gained when elements were oxidized, and he ascribed the result to the combining of the element with oxygen.
The concept of chemical reactions involving the combination of elements clearly emerged from his writing, and his approach led others to pursue experimental chemistry as a quantitative science. The other occurrence of historical significance concerning chemical reactions was the development of atomic theory. For this, much credit goes to English chemist John Dalton , who postulated his atomic theory early in the 19th century.
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Dalton maintained that matter is composed of small, indivisible particles, that the particles, or atoms , of each element were unique, and that chemical reactions were involved in rearranging atoms to form new substances. This view of chemical reactions accurately defines the current subject.
Thus, experiment and theory, the two cornerstones of chemical science in the modern world, together defined the concept of chemical reactions. Today experimental chemistry provides innumerable examples, and theoretical chemistry allows an understanding of their meaning. When making a new substance from other substances, chemists say either that they carry out a synthesis or that they synthesize the new material. Reactants are converted to products, and the process is symbolized by a chemical equation.
For example, iron Fe and sulfur S combine to form iron sulfide FeS. The state of matter of reactants and products is designated with the symbols s for solids , l for liquids , and g for gases. Chemical reaction. Article Media.