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U nit 1- Mass and Change Notes

In this lab, students will explore how the mass of an object changes during different reactions, such as changing the shape of steel wool, melting ice, burning steel wool, and dissolving sugar and Alka-Seltzer in water. The law of conservation of mass will be observed, where the mass of the reactants equals the mass of the products. Students will record their results and data to understand and analyze the changes in mass.

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U nit 1- Mass and Change Notes

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  1. Unit 1- Mass and Change Notes

  2. What could we have measured?

  3. Mass What is mass? How can it be measured?

  4. Unit 1- Mass and Change Lab

  5. Mass and Change Lab • Goal- What happens to the mass of an object when they are changed? Part 1: Change the shape of steel wool Part 2: Melting ice Part 3: Burning steel wool Part 4: Dissolved sugar in water Part 5: Dissolved Alka-Seltzer

  6. Mass and Change Lab Rubric

  7. Data The lab groups should report their results on the paper posted on the board so that the entire class data can be recorded. Change should be recorded as + (for a gain) or – (for a loss).

  8. Data

  9. End of Day

  10. Unit 1- Mass and Change Notes

  11. Law of Conservation of Mass • This law was developed by a French chemist named Antoine Lavoisier. • Lavoisier carefully measured the mass of the reactants and products when carrying out chemistry experiments. • He noticed that in every case, the mass of the reactants was ALWAYS equal to the mass of the products.

  12. Law of Conservation of Mass • Historical Context- Year was 1776. • He was the first scientist to recognize and name the elements hydrogen and oxygen. • In 1789, he wrote the first chemistry textbook. • Oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulphur (list also included 'light' and 'caloric‘). •  He was executed, along with hundreds of other nobles, during the French Revolution.

  13. Law of Conservation of Mass Key Concept 1: The law of conservation of massstates that mass is neither created nor destroyed in a chemical reaction, it is conserved. The mass of the reactants equals the mass of the products. massreactants = massproducts

  14. White Boarding Session • Each lab table will be assigned one experiment from lab. • On the whiteboard collaboratively draw a particle diagram that illustrates the law of conservation of mass for your assigned part. • Assign one person to explain the drawing and the other members need to be ready to answer questions from their classmates/teachers.

  15. Conclusion Questions

  16. End of Day

  17. What is this Matter? • Matter is anything that takes up space and has mass. • Water • Rocks • Air • Wood • Plastic • You • So what not matter?

  18. Matter is….. c • Key Concept 2: Matter is anything made of atoms (particles). • Matter has observable and measurable qualities. • Key Concept 3: Two basic types of properties of matter: physical properties and chemical properties. • Key Concept 4: All matter can undergo change: physical change or chemical change

  19. White Board Properties Change

  20. Properties • Key Concept 5: Physical properties can be observed without changing the substance(use your senses). • Key Concept 6: Chemical properties are determined by trying to change the make-up of a substance (only evident at the particle level).

  21. Change • Key Concept 7: Physical change- the original substance still exists (its particles are still the same); it has simply changed form. • Key Concept 8: Chemical change- takes place on the molecular level and produces a new substance (chemical changes are accompanied by physical changes) (hard to undo).

  22. Examples Chemical Properties Physical Properties Physical Change Chemical Change

  23. Salt

  24. Exit Pass: Physical(PC) or Chemical Change(CC) Part 1: ____ Change shape Part 2: ____ Melting ice Part 3: ____ Burning steel wool Part 4: ____ Dissolved sugar in water Part 5: ____ Dissolved Alka-Seltzer

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