CHEM 001 Midterm: CHEM 001 - Term Test 1
Document Summary
Value is a quantitative description that includes both a unit and a number. Units are quantities defined by standards that people agree to use to compare one event or object to another. International system of measurement base units are: length in meters (m), mass in kilograms (kg), time in seconds (s), and temperature in kelvin (k), etc. Prefixing before base units can indicated derived units. Eg. giga is 10^9 times the base unit. Rewrite the relationships using abbreviations for the units: 1 gigagram = ? gram, 1 centimeter = ? meter, 1 nanometer = ? meter. Answer: the prefix giga (g) means 109, so. 1 gigagram = 109 gram or 1 gg = 109 g: the prefix centi (c) means 10-2, so. 1 centimeter = 10-2 meter or 1 cm = 10-2 m: the prefix nano (n) means 10-9, so. Mass is usually defined as a measure of the amount of matter in an object.
