today we had two guests in chemistry. their names were Joan and David Webb.
he did lots of expirements involving pressure. to learn more about pressure click here. he was very interesting and called on many of my classmates to do the expirements. it was very entertaining. though i am worried about if my teacher check marked my name. he always seems to do that. i admit it when i talk he is allowed to check mark me but he is not allowed to check mark me for no reason. the picture is a vaccuum. many of the things we had to do involved this thing.
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