UNIT 2: Scientific Measurement Honors Chemistry GHS.

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Presentation transcript:

UNIT 2: Scientific Measurement Honors Chemistry GHS

Unit Objectives: Students will be able to… ●Convert between units of measure using dimensional analysis. ●Rank the relative magnitudes of metric measurements. ●Determine number of significant figures for data values. ●Determine number of significant figures for calculated values for functions (multiplication, division, addition, and subtraction). ●Describe uncertainty in measurement, accuracy and precision through experimental measurements and comparison of data sets. ●Calculate percent error for experimental data. ●Convert whole numbers into scientific notation. ●Rank the relative magnitudes of data values written in scientific notation. ●Identify the base unit for each SI unit.

Significant Figures Rules ●All non-zero numbers are significant

Significant Figures Rules ●All non-zero numbers are significant ●All captured zeros are significant

Significant Figures Rules ●All non-zero numbers are significant ●All captured zeros are significant ●All trailing zeros are significant when there is a decimal in the number

Significant Figures Rules ●All non-zero numbers are significant ●All captured zeros are significant ●All trailing zeros are significant when there is a decimal in the number ●All leading zeros are NOT significant

Significant Figures Rules

Significant Figures: EXAMPLES

Measurements and Significant Figures Different instruments allow for different numbers of significant figures. Consider this scenario:

Certainty and Measurement Our measurements are only “as good” as our tools Ben measured his pencil to be 4.2 cm long using the ruler shown. What digits of his measurement are CERTAIN?

Significant Figures Rules Adding and Subtracting: Your answers can only as precise as your least precise measurement

Significant Figures Rules Multiplication and Division The answer must have the same number of sig figs as the least number of sig figs in the operation

Significant Figures in OPERATIONS: EXAMPLES

SI UNITS: International System of Units

Dimensional Analysis

Dimensional Analysis: EXAMPLE:

Dimensional Analysis: YOU TRY IT! Set up the following problem and solve using dimensional analysis: