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Chemquest 1

Chemquest 1. Numbers in Chemistry Ch. 3 Sect. 2-3. Qualitative vs. Quantitative. Write an example of a quantitative observation that you make at home or at school. . Metric Base Units. Prefixes for Metric Base Units. Metric Conversions. Move decimal to the left. Move decimal to the right.

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Chemquest 1

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  1. Chemquest 1 Numbers in Chemistry Ch. 3 Sect. 2-3

  2. Qualitative vs. Quantitative Write an example of a quantitative observation that you make at home or at school.

  3. Metric Base Units

  4. Prefixes for Metric Base Units

  5. Metric Conversions Move decimal to the left Move decimal to the right

  6. Dimensional Analysis • Write down given measurement. • Setup a conversion factor. • Cancel units. • Calculate answer: • Multiply by each number on the top. • Divide by each number on the bottom.

  7. Scientific Notation Base must be between 1 and 10: 45,000,000,000,000 = 4.5 x 1016 2.641 x 1012 = 2,641,000,000,000 0.00000000000000378 = 3.78 x 10-15

  8. Scientific Notation Calculations Multiply = add exponents Divide = subtract exponents Add/Subtract = convert to same exponent

  9. Skills Practice 1 • 9,434,880 mL • 17.8 cases • 0.333 cases • a) 0.156 m; b)4 x 1010μg; c) 92,000 μg; d) 91,600 nm • a) 2.229 x 107; b) 8.07 x 106; c) 5.41 x 1020; d) 1.12 x 107 • a) 2.300021 x 1010; b) 3.5 x 10-9 • a) 235,400; b) 0.000000003400

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