Analía Bellizzi – Chemistry Classes

Ronald Reagan High School

AS Significant Figures Exercises

Significant Figures Exercises

  1. How many significant figures are contained in each of the following measurements?

    (a) 38.7 g

    (b) 2 × 1018 m

    (c) 3,486,002 kg

    (d) 9.74150 × 10−4 J

    (e) 0.0613 cm3

    (f) 17.0 kg

    (g) 0.01400 g/mL

  2. How many significant figures are contained in each of the following measurements?

    (a) 53 cm

    (b) 2.05 × 108 m

    (c) 86,002 J

    (d) 9.740 × 104 m/s

    (e) 10.0613 m3

    (f) 0.17 g/mL

    (g) 0.88400 s

  3. The following quantities were reported on the labels of commercial products. Determine the number of significant figures in each.

    (a) 0.0055 g active ingredients

    (b) 12 tablets

    (c) 3% hydrogen peroxide

    (d) 5.5 ounces

    (e) 473 mL

    (f) 1.75% bismuth

    (g) 0.001% phosphoric acid

    (h) 99.80% inert ingredients

  4. Round off each of the following numbers to two significant figures:

    (a) 0.436

    (b) 9.000

    (c) 27.2

    (d) 135

    (e) 1.497 × 10−3

    (f) 0.445

  5. Round off each of the following numbers to two significant figures:

    (a) 517

    (b) 86.3

    (c) 6.382 × 103

    (d) 5.0008

    (e) 22.497

    (f) 0.885

  6. Perform the following calculations and report each answer with the correct number of significant figures.

    (a) 628 × 342

    (b) (5.63 × 102) × (7.4 × 103)

    (c) \frac{28.0}{13.483}

    (d) 8119 × 0.000023

    (e) 14.98 + 27,340 + 84.7593

    (f) 42.7 + 0.259

  7. Perform the following calculations and report each answer with the correct number of significant figures.

    (a) 62.8 × 34

    (b) 0.147 + 0.0066 + 0.012

    (c) 38 × 95 × 1.792

    (d) 15 – 0.15 – 0.6155

    (e) 8.78 \times (\frac{0.0500}{0.478})

    (f) 140 + 7.68 + 0.014

    (g) 28.7 – 0.0483

    (h) \frac{(88.5-87.57)}{45.13}