Lesson Review: No Socrative today, for obvious reasons.
1. Demonstration data analysis.
2. Review for quiz.
1. Analyze lab data and determine if mass was conserved. Provide explanations as to why or why not.
2. Understand the content to be covered on the upcoming quiz.
Weebly Links: Particulate Nature of Matter & The Mole Concept
Textbook Readings: Section 1.1 & 1.2.
Mission 1: About That Lab...? A long, long time ago, back when dinosaurs walked the Earth and we first started this unit, we did a demonstration with copper and silver nitrate. You collected data on how much copper was used and how much silver nitrate was used. What you needed to find were the products and whether or not mass was conserved. I do not recall your specific measurements, but I did go back and collect the data on your products.
Reema: Your experiment produced 0.8mL of copper(II) nitrate and 0.05g of silver.
Reem: Your experiment produced 0.9mL of copper(II) nitrate and 0.03g of silver.
A simple calculations of conservation of mass means that you add up the mass of the reactants. Theoretically, if mass is conserved, the mass of the products should be the same. But we do not live in a perfect world, so usually the mass of the products is less than the mass of the reactants.
Determine if mass was conserved in your experiment.
The questions then become: Can you explain why mass wasn't conserved? How would you revise the experiment so that you get more product? What reactant ran out first and how does this affect the amount of product that was formed?
This leads us into Section 1.3: Reacting Masses & Volumes. Your quiz over 1.3 will be on October 25, so we have a lot to cover in a short time. It is my expectation that you will stay on top of the homework and be prepared for the scheduled labs.
Mission 2: Review. The quiz over 1.1 & 1.2 is scheduled for Wednesday, October 7. I have provided for you a practice quiz. Questions #1-12 cover sections 1.1 & 1.2. Section 1.3 is covered by #13-20. Do not work on these just yet, as we will come back to them later.
I will provide the answers below, but you are expected to work on these problems and be prepared with questions if you get some of them wrong.
1. C 2. B 3. D 4. B 5. A 6. C 7. A 8. B 9. D 10. B 11. C 12. B
10/5 Homework: Finish the practice quiz. Additional practice can be found at the end of 1.2 (p. 27) with the problems in the blue box.