The teacher is teaching the students some knowledge about elements in chemistry lesson.They talk about carbon, sodium and potassium.
Good morning class.
Good morning Mr.Chan.
Today, let's talk about elements.
We are going to talk about three element which are carbon, sodium and potassium.
Carbon is black in colour. It is not only in solid state but also gas state-carbon dioxide.
Sodium and potassium have a common chemical property. They can react with air readily.
Let's have a quiz next lesson. Goodbye class.
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