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What we did in class today: Monday April 16, 2012

What we did in class today: Monday April 16, 2012. Endothermic/Exothermic Lab review-We’ll go over your results in class and how the questions should have been answered. Most students did not do their homework over the weekend. They will need to revise their lab notes for a better grade.

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What we did in class today: Monday April 16, 2012

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  1. What we did in class today: Monday April 16, 2012 Endothermic/Exothermic Lab review-We’ll go over your results in class and how the questions should have been answered. Most students did not do their homework over the weekend. They will need to revise their lab notes for a better grade. Chemical Reactions review of notes. Make sure to complete and highlight any of the study guide notes that I do. Every highlighted item will be on Friday’s assessment. Make sure for Friday that you also know the parts of a chemical equation and can balance them. Group 4 will present tomorrow. Be ready.

  2. Bonds between atoms can be broken down and new bonds formed.

  3. Physical Change-water Is changing state. Chemical Change-hydrogen and oxygen Combine making water and energy is released. Substances present at the beginning of a chemical reaction. Bonds in reactants are broken. Oxygen when natural gas is burned.

  4. Substances formed by a chemical reaction. New bonds are formed. Natural gas before it is burned. Color Change: The reaction causes a new color in the substances to form. Temperature Change: Some can be observed like when an item burns. Formation of a Gas: Such as when antacid reacts with stomach acid. Formation of a Precipitate(solid): Such as when two liquids react making a seashell.

  5. Synthesis: a new compound is formed by the combination of simpler substances. Decomposition: reactants break down into simper substances. Combustion: oxygen reacts with a compound containing hydrogen and oxygen. Concentration, surface area, temperature and the presence of a catalyst. All influence the interaction between particles of a reactants through physical changes to reactants. Catalysts increase the rate of chemical reactions and are not consumed in a reaction.

  6. Endothermic Reactants Products HC2H3O2 + NaHCO3 CO2 + NaC2H3O2 (aq) + H2O (l) 2H2O2 2H2O + O2(g) Products Reactants Where is the yeast? Exothermic

  7. Temp. (oC) Time (min.)

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