Fall 07 HW1 solution

# Fall 07 HW1 solution - Homework Solution#1 1 Chapter 1...

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Homework Solution #1 1. Chapter 1, Problem 1, 39, 46, 53, 55 (Show the number before AND after rounding), 59, 67, 74, 78 1.1 a) A shows a physical change. The substance changes from a solid to a gas. b) B shows a chemical change. Two diatomic elements form from a diatomic compound. c) Both A and B result in different physical properties. Physical and chemical changes result in different physical properties. d) B is a chemical change; therefore, it results in different chemical properties. e) A does result in a change in state. The substance changes from a solid to a gas. 1.39 a) mass of water = 489.1 g - 241.3 g = 247.8 g V (cm 3 ) = ( ) 3 1 cm 247.8 g 1.00 g = 247.8 = 248 cm 3 b) Mass ( g ) = ( ) 3 3 1.48 g 248 cm cm = 366.744 g chloroform (unrounded) (flask + chloroform) 241.3 g + 366.744 g = 608.044 g = 608 g 1.46 a) ( ) 3 3 5 31.1 g cm 1 in 1 2.0tr.oz. 1 tr. oz 19.3 g 2.54 cm 1.6 x 10 in -   = 1.229 x 10 4 = 1.2 x 10 4 in 2 b) ( ) 3 5 1tr. oz. 31.1 g cm 1 1 in \$75.00 \$20.00 1 tr. oz 19.3 g 2.54 cm 1.6 x 10 in -   = 1.4869 x 10 5 = 1.49 x 10 5 cm 2 1.53 a) 5.0 8 b) 50 8 c) 5.0 80 x 10 3 d) 0.050 80 1.55 a) 231.554 barb2right 231.6 b) 0.00854 barb2right 0.0085 c) 144,000 barb2right 100,000 (or 1 x 10 5 ) 1.59 a) 2.420 g 15.6 g 4.8 g + = 3.7542 = 3.8 b) 7.87 mL 16.1 mL 8.44 mL - = 1.0274 = 1.0 (After the subtraction, the numerator has 2 significant figures.) c) V = ( ) ( ) 2 6.23cm 4.630 cm π = 564.556 = 565 cm 3 1.67 a) ( ) ( ) 7 3 2 8.32 x 10 g 4 3.1416 1.95 x 10 cm 3 = 2.6787 = 2.68 g/cm 3 b) ( ) ( ) 2 2 1.84 x 10 g 44.7 m/s 2 = 1.8382 x 10 5 = 18.4 x 10 5 g·m 2 /s 2 c) ( ) ( ) ( ) ( ) 2 4 3 3 5 2 1.07 x 10 mol/ L 2.6 x 10 mol/ L 8.35 x 10 mol/ L 1.48 x 10 mol/ L - - - - = 0.109969 = 0.11 L/mol 1.74 a) Experiments II and IV — the averages appear to be near each other.

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