Lesson Plan

Period #2 Significant Figures & Scientific Notation

Materials : Textbook : Chemistry - Nelson

Review : Go over homework from worksheet on Sig Figs.

Objectives : students should be able to :

1.3. determine the number of significant figures in a measured quantity and relate to the uncertainty

1.3.1. Significant Digits - Addition/Subtraction

1.3.2. Significant Digits - Multiplication/Division

1.3.3. Scientific Notation

1.3.3.1. Addition/Subtraction

1.3.3.2. Multiplication/Division

Part I . Calculations with Significant Figures - Introduction and Notes :

Give notes and examples starting page 1-5, "Calculations with Significant Figures", go through the method of addition, subtraction, multiplication and division with significant figures.

Guided Practice :

2.6 m x 3.42 m = 8.892 m² = 8.9 m²

3.10 m x 4.520 m = 14.012 m² = 14.0 m²

2.33 cm x 6.085 cm x 2.1 cm = 29.7739 cm³ = 28 cm³

Exercise :

Do "Significant Digits" worksheet - hand in next class

Evaluation :

Do "Significant Digits" worksheet - hand in next class

Unit Three Test

Part II . Mathematical Tools (Scientific Notation) - Introduction and Notes :

 

Give notes starting "SCIENTIFIC NOTATION" page 1-6, explain exponents, proper scientific notation and go through examples on pages 1-6 to 1-7.

 

Guided Practice :

Convert the Following Into Proper Scientific Notation, with 2 significant digits :

0.00087 becomes 8.7 x 10¯⁴

9.8 becomes 9.8 x 10⁰

23,000,000 becomes 2.3 x 10⁷

0.000000809 becomes 8.1 x 10¯⁷

4.56 becomes 4.6 x 10⁰

250,000,000,000 becomes 2.5 x 10¹¹

Exercise :

Evaluation :

Unit Three Test

 

Part III : Scientific Notation - Mathematical Operations - Introduction and Notes

Give notes and examples starting "MATHEMATICAL OPERATIONS" page 1-7 to p 1-8, explain addition, subtraction, multiplication, and division using scientific notation.

Guided Practice :

1) (2.68 x 10¯⁵) x (4.40 x 10¯⁸) Ans. 1.18 x 10¯¹²

2) (2.95 x 10⁷) ÷ (6.28 x 10¹⁵) Ans. 4.70 x 10¯⁹

3. (8.41 x 10⁶) x (5.02 x 10¹²) Ans. 4.22 x 10¹⁹
1. (9.21 x 10¯⁴) ÷ (7.60 x 10⁵) Ans. 1.21 x 10¯⁹

 

Exercise :

Finish side Two of Sig Fig / Scientific Notation Worksheet

Evaluation :

Sig Fig / Scientific Notation Worksheet

Chapter Review Sheet

Unit Three Test