In this lesson, the teacher models and describes the kinds of information students will be looking for in their research project on a synthetic product. This is done by using an example of a synthetic product that students make in the classroom: a gel worm (not for eating.) Students make it by combining a sodium alginate solution with a calcium chloride solution. The teacher uses this product to model answers to the three questions students need to answer in their research:
Students choose or are assigned a synthetic product to research. They investigate the product to answer the three questions. Students apply their learning to make an advertisement, poster, short video, or article about their synthetic product.
Students will be able to find and analyze information to describe that chemical processes are used to convert natural resources into synthetic materials and products. They will also be able to give examples of how the production of synthetic products has impacts, both positive and negative, on society.
A mixture contains two or more substances that retain all their original properties and can be physically separated. Mixtures can be homogenous or heterogeneous.
The classroom resource provides a video that will describe the two types of mixtures. There is also a short test that can be used to assess students' understanding.
An element is as simple as it gets: substances that cannot be broken down into simpler substances. When elements get together and mix chemically, they make compounds, like water and salt!
The classroom resource provides a video that will describe the difference between elements and mixtures. There is also a short test that can be used to assess students' understanding.
In this activity, students will prepare a test solution whose color changes when an acid or a base is added; determine whether various household substances are acids or bases and look for patterns in the results; determine how their test solution compares to commercial acid-base testers; and search for other test solutions.