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This is a wonderful lesson showing learners how they can sort through the information on chemical reactions of metals to find appropriate information to help them solve particular problems. Knowledge of these reactions is essential and so it is advisable to encourage learners to study this chemistry. It may be useful to stop the video at the beginning of the section on problem solving for each unknown substance – then discuss with the class what the substance could possibly be. Help your learners to think logically by using a process of elimination beginning with the physical properties of a metal and then working through all the possible reactions.