Measurement and Sci Notation

Chapter 2 Lecture Slides (1)
Chapter 2 EOC Problems (1).pdf
Chapter 2 Answers

  • A quantitative observation is called a measurement and consists of a number and a unit.

  • Very large or very small numbers are conveniently expressed by using scientific notation.

    • The number is expressed as a number between 1 and 10 multi-
      plied by 10 and raised to a power.

  • Units provide a scale on which to represent the results of a measurement. There are three commonly used unit systems.

    • English

    • Metric (uses prefixes to change the size of the unit)

    • SI (uses prefixes to change the size of the unit)

  • All measurements have some uncertainty, which is reflected by
    the number of significant figures used to express the number.

  • Rules exist for rounding off to the correct number of significant figures in a calculated result.

  • We can convert from one system of units to another by a method called dimensional analysis using conversion factors.

  • Conversion factors are built from an equivalence statement, which shows the relationship between the units in different systems.

  • Density represents the amount of matter present in a given
    volume


Assignment Chapter 2