Answer: Substances that are formed as a result of a chemical reaction are called products and are written on the right-hand side of the equation. Changes in the states of substance or system are known as reactions and can be divided into two types, chemical reaction and physical reactions. When atoms or group of atoms rearrange resulting in the formation of the new chemical state due to the formation of chemical bonds are called Chemical reactions. The substances undergoing changes are called reactants, written on the left-hand side of the equation, and newly formed substances are called products written on the right-side of the chemical equation.
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The teacher will use a small candle flame to demonstrate a chemical reaction between the candle wax and oxygen in the air. Students will see a molecular animation of the combustion of methane and oxygen as a model of a similar reaction. Students will use atom model cut-outs to model the reaction and see that all the atoms in the reactants show up in the products. ObjectiveStudents will be able to explain that for a chemical reaction to take place, the bonds between atoms in the reactants are broken, the atoms rearrange, and new bonds between the atoms are formed to make the products. Students will also be able to explain that in a chemical reaction, no atoms are created or destroyed. EvaluationDownload the student activity sheet, and distribute one per student when specified in the activity. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan. SafetyBe sure you and the students wear properly fitting goggles. Be careful when lighting the candle. Be sure that the match and candle are completely extinguished when you are finished with the demonstration. Materials for the Demonstration
Materials for Each Student
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