CHM3120-Fall 2023
Homework #1
Name: ______________________________________
1. (3 pts) How many significant figures are there in the following numbers?
a) 1.903330
b) 0.003910
c) 1.40 × 104
2. (4 pts) Round each number as indicated:
a) 2.051 to 2 significant figures
b) 2.0050 to 3 significant figures
3. (4 pts) Write each answer with the correct number of digits.
a) 12.3 – 1.63 = 10.67
b) 0.0602 ÷ (2.113 × 104) = 2.84903 × 10-6
4. (3 pts) Explain the difference between systematic error and random error.
5. (6 pts) Find the absolute and percent relative uncertainty and express each answer with a reasonable
number of significant figures.
a) 9.23 (±0.03) + 4.21 (±0.02) – 3.26 (±0.06) = ?
b) 91.3 (±1.0) × 40.3 (±0.2)/21.1 (±0.2) = ?
-1-