2: Chapter 2 - Measurements
- Page ID
- 366578
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- 2.1: Units in Measurements
- Chemistry, like all sciences, is quantitative. It deals with quantities, things that have amounts and units. Dealing with quantities is very important in chemistry, as is relating quantities to each other. In this chapter, we will discuss how we deal with numbers and units, including how they are combined and manipulated.
- 2.2: Numbers in measurement (scientific notation)
- Standard notation expresses a number normally. Scientific notation expresses a number as a coefficient times a power of 10. The power of 10 is positive for numbers greater than 1, and negative for numbers between 0 and 1.
- 2.4: Density (definition and formula)
- Chemistry uses the Celsius and Kelvin scales to express temperature. A temperature on the Kelvin scale is the Celsius temperature plus 273.15. The minimum possible temperature is absolute zero and is assigned 0 K on the Kelvin scale. Density relates the mass and volume of a substance. Density can be used to calculate volume from a given mass, or mass from a given volume.