IDENTIFYING AND CALCULATING WITH SIG DIGS Significant Digits.

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Presentation transcript:

IDENTIFYING AND CALCULATING WITH SIG DIGS Significant Digits

1. Identify the number of sig digs in the following numbers. 2. Identify the rule that makes it true. 3. Tell me what instrument is used to obtain the measurement. A m B. 1,000 kg C cm D g E. 2,356 mL F. 3,000,000,000,000 s G. 840 °C H L 4. Put A and F into Scientific Notation.

Answers A m (2 SD, R#1, R#4) B. 1,000 kg (1 SD, R#1, R#4) C cm (3 SD, R#1, 2) D g (7 SD, R #1, 2) E. 2,356 mL (4 SD, R#1) F. 3,000,000,000,000 s (1 SD, R#1, 4) G. 840 °C (2 SD, R#1, 4) H L (5 SD, R#1, 2, 3)

Adding and Subtracting w/ Sig Digs The answer to the problem can have no more DECIMAL PLACES than the number with the least number of decimal places. Ex: 2.34 g g= 5.74 ≈ 5.7g Ex: cm + 3 cm= ≈ 9 cm Ex: 8.93 m – 3.41 m= 5.52 m

Multiplying and Dividing w/ Sig Digs The answer can have no more SIG DIGS than the number with the least number of sig digs. Ex: 2.3 x 4.79 = ≈11 Ex: 5.92 ÷ = ≈4.80