Chemistry Question

Overview

Pre Quiz 1 Measurement and Significant Figures

1. Determine the correct number of significant digits in each of the following numbers: Numbers Number of significant digits 602 mL 54.320 g 0.002405 mol 9.860 x 102 mm 2.050 g 25.0 cm2 2. Convert each of the following units, using the conversion factors in the manual. Show the cancellation of units. ( a ) 5.29 pm × m pm × μm m = μm ( b ) 125 ng × × = mg CHEM 1411

3. Calculate to the correct significant figures and units. Show your calculation steps. (a) 0.005 g + 2.5 g = (b) 16.85 mL – 2.65 mL = (c) (35.58 mL – 0.24 mL) x 0.978 g/mL= (d) (23.465 g – 20.487 g) ÷ 3.35 mL = (e) (2.34 cm ÷ 2) x 3.4 cm = (Note:2 is an exact number) CHEM 1411