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## Using Chemical Equations

Chemistry is really about reactions. Chemical change is a rearrangement of atoms – as one or more substances change to new substances. Mole-to-mole relationships and mass calculations in particular provide a wealth of information to practicing chemists – and to chemistry students. Applying mathematical ratios, making practical use of scientific notation, and thoughtfully comparing both sides of an equation are important skills for chemistry students to master.

###### Lesson 1 (or “Day 1”) Material

###### Lesson 2 (or “Day 2”) Material

- Day 2 Instructor Presentation
- Day 2 Student Handout
- Day 2 Rubric
- Read Chem 25 – Balanced Equations
- Read Chem 25 – Chemical Equations
- Read Chem 25 – Description

###### Lesson 3 (or “Day 3”) Material

###### Lesson 4 (or “Day 4”) Material

2:20 How to Balance a Chemical Equation by Multiplying by the Denominator : Math Equations & More

11:08 A Beginner’s Guide to Balancing Equations

14:27 Balancing Chemical Equations

#### Compare Contrast and Debate

* Background: *Often, in math-related work, there are multiple “paths” for arriving at a correct answer.

Once having mastered one technique, no further techniques are needed or appropriate.**Position A:**Multiple techniques, if available, are always helpful to learn.**Position B:**

#### Resources Documents and Links

- CH25.Balancing_Chemical_Equations.tns
- CH25.Balancing_Chemical_Equations_Practice.tns
- CH25.Bellringer__Balancing_Chemical_Equations.tnsp

#### Notes and Notices

**Instructor Emphasis:**

- Science & Engineering Practice: Develop and use models.
- Cross-Cutting Concept: Patterns.