1. the students prior knowledge by reviewing the idea, writing the name of the substance with properties as acid and base properties as the substances known as many students as possible in 5 minutes.
1. Rethinking students' prior knowledge by writing the name of the substance is acidic properties. And substances whose properties are based on the students. Known as possible in five minutes.
1. Students think the same knowledge by writing the name of its properties is acid. The properties and a base at the students. Known to most of the time 5 minutes .