Lesson Plan

Period #1 Unit Two Exam & Measurement in Chemistry

Materials : Textbook : Chemistry - Nelson, Sig Fig Worksheet

Review :

Objectives : The students should be able to :

1.2. describe the imprecise nature of all measurements

1.2.1. Accuracy & Precision

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

1.4. round off calculated results to the appropriate number of significant figures

 

Part I . Accuracy Precision - Introduction and Notes :

Give notes starting, "ACCURACY AND PRECISION", on page 1-2 to 1-3, define and explain the differences between the two terms.

Demonstrate the % difference formula and do example on page 1-2

 

Guided Study :

Board Work Questions

 

Part II . Significant Figures and Exact Numbers - Introduction and Notes :

Give notes starting "Significant Figures" on page 1-4, explain which digits are significant and compare measured data to exact numbers.

 

Guided Practice :

Show and Discuss overhead transparencies on uncertainty and significant digits.

Identify the number of significant figures:

1) 3.0800

2) 0.00418

3) 7.09 x 10¯⁵

4) 91,600

5) 0.003005

6) 3.200 x 10⁹

7) 250

8) 780,000,000

9) 0.0101

10) 0.00800

 

Exercise :

Sig Figs and Scientific Notation Worksheet numbers 1-2

Evaluation :

Sig Figs and Scientific Notation Worksheet numbers 1-2

Unit Three Test