| Chapter One |
| Physical Quanity Name Of Unit Abbreviation Mass- kilogram kg Length- meter m Time- second s Temperature- Kelvin K Electric Current- ampere A Amount of Substance- mole mol Luminous Intensity- candela cd |
| The SI Units: |
| 1. Nonzero Integers- always counts as sig figs 2. Zeros- a) Leading zeros- precede all nonzero digits- do NOT count as sig figs b) Captive zeros- zeros between non-zero numbers- always count as sig figs c) Trailing zeros- at the RIGHT END of the number- significant only if the number contains a decimal point |
| Rules For Significant Figures: |
| 1. Carry extra digits through to final result, then round 2. If the digit to be removed is: a) less then 5, the number before it stays the same b) equal to or more then 5, the number before it is increased by 1 (one) |
| Rules For Rounding: |
| - To convert one unit to another, use the equivalence statement that relates the two units - cancel unwanted units - Multiply the quantity to be converted by the unit factor to give the quantity with the desired units Example: Convert 25.5 into centimeters: (2.54cm = 1 inch) 25.5 in x 2.54cm = 64.8 cm 1 in |
| Converting: |
| Convert 98.6 F into Celsius and Kelvin: 98.6- 32= 66.6 66.6F x 5/9= 37.0C 37+ 273.15= 310.2 K C= 37.0 degrees K= 310.2 degrees |
| Examples: |
| What is the density of a 15 g sample in 25 ml of liquid? Density= mass/volume 19.625g = 0.7850g/ml 25.00ml D= .7850 |
| Example 2: |
| Example 1: |