 We can then add the N parts of the numbers, keeping the exponent, n, the same.Solution: Write each quantity with the same exponent, n.n Strategy: Let's express scientific notation as N × 10 .When dividing numbers using scientific notation, divide the N parts of the numbers in the usual way.Unformatted text preview: CHAPTER 1 CHEMISTRY: THE STUDY OF CHANGE Problem Categories Biological: 1.24, 1.48, 1.69, 1.70, 1.78, 1.84, 1.93, 1.95, 1.96, 1.97, 1.105. Difficulty Level Easy: 1.3, 1.11, 1.13, 1.14, 1.15, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.29, 1.30, 1.31, 1.32, 1.33, 1.34, 1.54, 1.55, 1.63, 1.64, 1.77, 1.80, 1.84, 1.89, 1.91. 1.14 (a) (f) K Pu 1.15 (a) element 1.16 (a) (d) (g) homogeneous mixture homogeneous mixture heterogeneous mixture 1.21 density = 1.22 Strategy: We are given the density and volume of a liquid and asked to calculate the mass of the liquid. Substitute the temperature values given in the problem into the appropriate equation. °C = (105 − 32)°F × (b) 5°C = 41°C 9°F Conversion from Celsius to Fahrenheit. °F = ⎜ 6.3 × 103 °C × 5°C ⎟ ⎝ ⎠ (d) Conversion from Fahrenheit to Celsius. 1.52 × 10 (b) (c) −2 = 0.0152 indicates that the decimal point must be moved 8 places to the left.

3 n 3 Let’s write 0.0095 in such a way that n = −3.

We have decreased 10 by 10 , so we must increase N by 10 . 0.0095 = 9.5 × 10 −3 Add the N parts of the numbers, keeping the exponent, n, the same.

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