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).
Context example: there was a chemical reaction of the lime with the ground water. Hypernyms (chemical reaction is a kind of...): chemical action; chemical change; chemical process ((chemistry) any process determined by the atomic and molecular composition and structure of the substances involved).hemical decomposition reaction; decomposition; decomposition reaction ((chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance). chemical equilibrium; equilibrium (a chemical reaction and its reverse proceed at equal rates).