Unit 3: Measuring & Calculating
Assigned reading:
All students: Read Ch. 3 "Measuring and Calculating" in the white book.
AP Chemistry: We are continuing with Atomic Structure. Your instructions and handouts are posted on the previous page.
Labs
All students: Read Ch. 3 "Measuring and Calculating" in the white book.
AP Chemistry: We are continuing with Atomic Structure. Your instructions and handouts are posted on the previous page.
Labs
- Air in Classroom (Density and Sig Figs)
- Pool Cubes density weblab
Handouts
| Air_in_the_classroom_lab_handout.docx |
| Pool_cubes_-_density_weblab handout.pdf |
| CHART_showing_units_prefixes_sig_fig_rules.docx |
Ch. 3 Review Exercises
Complete the following problems starting on p. 69: #16-17-18-19 (all parts), 21abcd, 22-23 (all parts), and 24ab. Make sure you have all 26 answers, worth 26 points. Write them up neatly IN YOUR OWN HANDWRITING. Keep the same numbering, please! Show all calculations or you will have points deducted.
Complete the following problems starting on p. 69: #16-17-18-19 (all parts), 21abcd, 22-23 (all parts), and 24ab. Make sure you have all 26 answers, worth 26 points. Write them up neatly IN YOUR OWN HANDWRITING. Keep the same numbering, please! Show all calculations or you will have points deducted.
Rules for Counting Significant Figures
- Non-zero digits are always significant. For example, 123 has three significant figures.
- Zeros between non-zero digits are significant. For example, 1005 has four significant figures.
- Leading zeros (zeros to the left of the first non-zero digit) are not significant. For example, 0.0025 has two significant figures.
- Trailing zeros (zeros to the right of the last non-zero digit) are significant if a decimal point is present. For example, 1.20 has three significant figures, while 120 (without a decimal) has two.
- Trailing zeros in a whole number without a decimal point are ambiguous. For example, 100 could have one, two, or three significant figures, depending on the context. To avoid ambiguity, use scientific notation (e.g., 1 x 10^2, 1.0 x 10^2, or 1.00 x 10^2).
Rules for Calculations with Significant Figures
- Multiplication and Division: The result should have the same number of significant figures as the number with the fewest significant figures in the calculation.
- Addition and Subtraction: The result should be rounded to the same number of decimal places as the number with the fewest decimal places.
Other
| Pool_cubes_density_weblab_student_example.pdf |