Let's look at a few assessment scenarios. Try to determine what type of assessment is being used, formal or informal. 1  Example 1. 2  A kindergarten teacher sets aside the first 15 minutes of every day to allow students to explore, play or engage in any activity of their choice.
Chemical bonds are made or broken in order to create a new molecule. One example of a chemical reaction is the rusting of a steel garbage can. That rusting happens because the iron (Fe) in the metal combines with oxygen (O2) in the atmosphere. Chemical bonds are created and destroyed to finally make iron oxide (Fe2O3).
Chemical reactions involve rearrangement of the atoms and produce. new substances in this process. For example, in the above picture, just the mixing of two substances can cause. the chemical reaction to occur. Chemical Reactions are everywhere in nature. The process by which the plants make their own food is called photosynthesis.