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| Example from the chromatography lab |
Today in honors chemistry we began our second unit. We began by trying to describe images to each other by using intensive and extensive physical properties. Please don't forget that an extensive property depends on the quantity of matter. ( remember the riddle - what is heavier a pound of lead or a pound of feathers) An intensive property is dependent on the matter like boiling point, melting point, and density. We also learned to distinguish between chemical properties and physical properties. We reviewed indicators of a chemical change by watching a chemical demonstration that involved sodium safely reacting with water. 2 indicators were present - bubbles of gas and a color change ( I cheated by adding an indicator so we could see the water turn pink as the base formed.) Don't forget that indicators tell us that a chemical reaction might have happened but the only way to know for sure is if we check the composition of the materials before and after the reaction. We began to classify matter based on its composition. Most of our discussion centered on the different types of mixtures. Finally we completed our chromatography lab. This is always fun to see the different pigments of color separate due to their polarity. HW for tonight will be to answer the lab questions 1-4 and to complete the pre-lab question for our next lab. On Wednesday and Friday, we will be in lab with glass!!! Make sure you are wearing close toe shoes and long pants. Please read and outline section 2.3
Until next time,
Mrs. E
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