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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Significant Figures

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QUESTION ANSWER

1.

Express each measurement to the correct number of significant figures.

  1. Pressure gauge with arrow pointing halfway between the seventh and eigth mark after three hundred.
  2. Ruler measuring a square that ends three marks after the one centimeter mark.

1.

  1. 375 psi
  2. 1.30 cm

3.

How many significant figures do these numbers have?

  1. 23
  2. 23.0
  3. 0.00023
  4. 0.0002302

3.

  1. two
  2. three
  3. two
  4. four

5.

How many significant figures do these numbers have?

  1. 765,890
  2. 765,890.0
  3. 1.2000 × 105
  4. 0.0005060

5.

  1. five
  2. seven
  3. five
  4. four

7.

Compute and express each answer with the proper number of significant figures, rounding as necessary.

  1. 56.0 + 3.44 = ?
  2. 0.00665 + 1.004 = ?
  3. 45.99 − 32.8 = ?
  4. 45.99 − 32.8 + 75.02 = ?

7.

  1. 59.4
  2. 1.011
  3. 13.2
  4. 88.2

9.

Compute and express each answer with the proper number of significant figures, rounding as necessary.

  1. 56.7 × 66.99 = ?
  2. 1.000 ÷ 77 = ?
  3. 1.000 ÷ 77.0 = ?
  4. 6.022 × 1.89 = ?

9.

  1. 3.80 × 103
  2. 0.013
  3. 0.0130
  4. 11.4

11.

  1. Write the number 87,449 in scientific notation with four significant figures.
  2. Write the number 0.000066600 in scientific notation with five significant figures.

11.

  1. 8.745 × 104
  2. 6.6600 × 10−5

13.

Perform each calculation and limit each answer to three significant figures.

  1. 67,883 × 0.004321 = ?
  2. (9.67 × 103) × 0.0055087 = ?

13.

  1. 293
  2. 53.3

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