1 / 16

TEACHER’S GUIDE TO INQUIRY-BASED TEACHING

TEACHER’S GUIDE TO INQUIRY-BASED TEACHING. Does Mass Change in a Chemical Reaction?. CONCEPTS INTRODUCED IN THIS LESSON SET. Conservation of Mass Open Systems Closed Systems. STUDENT OBJECTIVES.

akio
Download Presentation

TEACHER’S GUIDE TO INQUIRY-BASED TEACHING

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TEACHER’S GUIDE TO INQUIRY-BASED TEACHING Does Mass Change in a Chemical Reaction?

  2. CONCEPTS INTRODUCED IN THIS LESSON SET • Conservation of Mass • Open Systems • Closed Systems

  3. STUDENT OBJECTIVES • TSWBAT investigate whether mass stays the same or changes during a reaction that does not include a gas. • TSWBAT investigate whether measuring the mass of reactants and products could provide evidence of whether new substances always come from old substances.

  4. DEFINITION • The principle of “conservation of mass” is that the total mass before a chemical reaction is equal to the total mass after a reaction in a closed system because no material (atom) can enter or leave the system. Material (consisting of atoms) is neither created nor destroyed in chemical reactions.

  5. Instructional Sequence • REVISIT DRIVING QUESTION • INTRODUCE SUB-QUESTION • TAP RECENTLY LEARNED CONCEPTS • ACCESS STUDENT THINKING • ELICIT DESIRED RESPONSES • CONNECT STUDENT UNDERSTANDING • LET’S INVESTIGATE!!! • WRAP UP AND REVISIT SUB-QUESTION

  6. REVISIT THE DRIVING QUESTION • “How can I make new substances from old substances?

  7. INTRODUCE SUB-QUESTION • “Do new substances always come from old substances?”

  8. TAP RECENTLY LEARNED CONCEPTS • “What happens in a chemical reaction?”

  9. ACCESS STUDENT THINKING • Do you think new substances always come from old substances or could they come from somewhere else? • Is there something you can measure to provide evidence for whether new substances come from old substances?

  10. ELICIT DESIRED RESPONSES BY PROVIDING CONNECTIONS • Do you think the mass of the reactant is the same or different than the mass of the products after a chemical reaction? • Remember that the copper and acetic acid had the same mass as the copper acetate and hydrogen gas produced during the reaction in Lesson 8.

  11. CONNECT STUDENT UNDERSTANDING TO SUB-QUESTION • Does measuring mass provide evidence to answer the sub-question - “Do new substances always come from old substances?”

  12. LET’S INVESTIGATE!!! • Activity 13A - Does Mass change when we make gloop? (reaction not including a gas) • Activity 13.1 – Does Mass Change when Alka-Seltzer reacts? (open system) • Activity 13.2 Does Mass Really change when alka-seltzer reacts? (students design closed system)

  13. WRAP UP • Redefine “Conservation of Mass” law – that total mass before a reaction is equal to the total mass after the reaction in a closed system. • Explain that mass is always conserved because atoms can never be created or destroyed. • Connect conservation of mass to other processes such as boiling, freezing, creating mixtures, etc.

  14. REVISIT SUB-QUESTION • Did the last two experiments with Alka-Seltzer support the sub-question? • Since the mass stayed the same in the closed system, this suggests that new substances only come from old substances. Material cannot be created or destroyed. • Homework – write a response to question in the Student Reader 13.2.

  15. THANK YOU! Now let’s investigate conservation of mass!!

More Related