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Law of Conservation of Mass Essential Lab

Law of Conservation of Mass Essential Lab. Catalyst. Classify the following as an element, compound or mixture: Baking soda Carbon Classify each of the following as a homogeneous or heterogeneous mixture M outhwash Ice cubes in water.

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Law of Conservation of Mass Essential Lab

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  1. Law of Conservation of Mass Essential Lab

  2. Catalyst Classify the following as an element, compound or mixture: Baking soda Carbon Classify each of the following as a homogeneous or heterogeneous mixture Mouthwash Ice cubes in water

  3. SWBAT apply the law of conservation of mass to chemical and physical changes

  4. Agenda We do: Lab setup (10 min) You do: LoCM Essential Lab (60 min) I do: Law of Conservation of Mass Mini lesson (10 min) You do: data analysis and conclusion (10 min)
  5. How is mass affected during a chemical and physical change?Let’s find out!
  6. Essential Lab You will be performing physical and chemical changes on different substances and measuring the mass before and after the change Formation of a precipitate Crushing smarties Melting ice Baking soda and vinegar Dissolving sugar Dissolving Alka-seltzer
  7. Conservation of Mass Lab You will need to write a complete lab report, with all of the components from the ETO lab template Cover page Title Introduction Problem statement Hypothesis Materials Procedures (1-2 sentences for each table) Variables Data Data analysis Conclusion
  8. Lab Setup Leave a space in your notebook for the cover page, title and introduction Write down the problem statement, hypothesis, materials and variable Problem Statement: How is the mass of matter affected if it undergoes a physical or a chemical change? Hypothesis: How do you think the mass of the matter will be affected after the change? Will it increase, decrease or stay the same? WHY? Variables: IV, DV, Control, Constant
  9. Lab Data and Calculations Data tables (6 total) = ‘change in’ Particle level representation (6 total) Is this a physical or a chemical change? How would particles look with a physical or a chemical change?
  10. You have 8 minutes at each station USE YOUR TIME WISELY Lab group roles Project director = makes sure group is on task and on time Technical manager = performs all the measurements on the balance Materials manager = organizes and cleans materials before moving to the next station Safety director = keeps track of time, assists materials and project director
  11. Lab Expectations You will clean the materials when you are asked to do so You will rotate to the next station when you are asked to do so You will not leave your station unless you are the technical director You will not talk to other lab groups You will not prevent other groups from going to a station because you did not use time wisely and did not finish
  12. LABS ARE A PRIVLEDGE If you are not following lab expectations you will be given a data sheet and asked to complete the lab from your seat.
  13. What were your results? Was your hypothesis supported?
  14. Law of Conservation of Mass Mass cannot be created or destroyed, it can only be converted
  15. State the Law. Equation In any physical or chemical reaction, the total mass is conserved or does not change. massreactants= massproducts Law of Conservation of Mass In a Picture Common Misconception Mass does not change even if the substance changes to a new phase.
  16. Other ways to say “conserved” Saved Keep What goes in must come out Reactants equal products Remains massreactants= massproducts
  17. Data Analysis and Conclusion Make sure you have a data table and particle level representations for ALL six parts Answer the ‘DATA ANALYSIS’ part with complete sentences Answer all 7 conclusion questions (minimum 3 paragraphs) Complete lab report as homework – due next class
  18. Extra Problem Magnesium reacts with oxygen to produce magnesium oxide. If 2.4g of magnesium reacts to make 2.9g of magnesium oxide, how many grams of oxygen react?
  19. Extra Problem Donald does a reaction in which he mixes 40 grams of sodium hydroxide with 32 grams of another chemical. After the reaction has completed, he is left with a precipitate that has a mass of 18 grams. How much gas was released in this reaction?
  20. Another way to say mass is conserved is to say that the mass of the reactants equals the mass of the prodcuts
  21. Extra Problem 50 grams of sodium reacts with chlorine to form 126 grams of salt. How many grams of chlorine reacted?
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