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Do Now: Arrange the following steps of the scientific method in order:

Do Now: Arrange the following steps of the scientific method in order: . ___ Form a hypothesis ___ Collect data ___ State the problem ___ Test the hypothesis with an experiment ___ Conclude ___ Organize and Analyze data. Units of Measurement. What are measurements?.

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Do Now: Arrange the following steps of the scientific method in order:

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  1. Do Now: Arrange the following steps of the scientific method in order: ___ Form a hypothesis ___ Collect data ___ State the problem ___ Test the hypothesis with an experiment ___ Conclude ___ Organize and Analyze data

  2. Units of Measurement

  3. What are measurements? Measurements are a comparison between the quantity being measured and a certain standard quantity called a unit of measurement.

  4. International System of Units (SI) The metric system or the international system of units (SI) is the system of standard units that is used around most parts of the world and in the field of science.

  5. The US uses the English system for measurements, whereas, the rest of the world uses the metric system. Most people in the world know exactly how long a kilometer is, how large a liter is, how much a kilogram weighs, and how warm 25°C is, because they use these units everyday of their lives in the same way Americans use miles, gallons, and pounds.

  6. The field of science uses the metric system for measurements. Before an actual system of measurement was adopted, the king’s measurements were used. For example, the distance between the king’s knuckle to the tip of his finger was considered an inch. The king’s foot was a foot. Every time the king changed, the measurements changed. This was not an accurate means for measurement.

  7. Base units There are seven base units in the SI. A base unit is a unit of measurement that is based on an object or event in the physical world.

  8. SI Base Units Physical QuantitySI Unit • Mass kilogram (kg) • Length meter (m) • Time seconds (s) • Temperature Kelvin (K) • Quantity mole (mol) • Electric Current ampere (A) • Luminous intensity candela (cd)

  9. The decimal system SI is based on a decimal system. Multiples and fractions of the fundamental units are created by adding prefixes. Prefixes are used to extend the range of SI units.

  10. Prefixes

  11. Derived Units Not all quantities can be measured using the SI base units. For example, volume and density are measured using units that are a combination of base units. A SI unit that is defined by a combination of base units is called a derived unit.

  12. Derived Units Commonly Used in Chemistry

  13. Metric conversions EXAMPLE 1: 103 kg  Dg

  14. Example 2 .43 dg  mg

  15. Example 3 2,132 cm  hm

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