Language of Chemistry - SI Units and Prefixes

Question 1

SI Units

Answer 1

• time: second
• length: meter
• mass: kilogram
• amount of substance: mole
• temperature: kelvin
• electrical current: ampere
• luminous intensity: candela

Question 2

SI prefixes

Answer 2

• Giga: G: 1,000,000,000: 10^9
• Mega: M: 1,000,000: 10^6
• Kilo: k: 1000: 10^3
• base unit: 1: 10^0
• deci: d: 0.1: 10^-1
• centi: c: 0.01: 10^-2
• milli: m: 0.001: 10^-3
• micro: µ: 0.000001: 10^-6
• nano: n: 0.000000001: 10^-9
• pico: p :0.000000000001: 10^-12

Question 3

SI Units and Prefixes

Answer 3

• Base unit, second, meter, kilogram, kelvin, mole, candela, ampere
• prefixes based on decimal powers of 10
• Consider computer memory/data storage
• the base unit is the byte
• 1000 bytes = 1 kilobyte
• 1,000,000 bytes = 1 megabyte
• 1,000,000,000 bytes = 1 gigabyte
• 750 milligrams = 0.750 grams
• 1 milliliter = 1000 microliters
• 0.250 micromoles = 250 nanomoles