Unit 2 - Chemistry

Steps for Dimensional Analysis

1. Write the "K:" and the "U:" (K is what you KNOW, U is what you are trying to FIND) 2. Write out your plan (write out the units you are 3. converting from and to and the conversion factors) 4. Write your known (put over one) 5. Write " x___________" 6. Write the known units in denominator

Dimensional Analysis

A method used to convert units. It also uses "conversion factors".

wk->days->hours->minutes->seconds 1 wk=7 days; 1 day=24hr; 1 hr= 60min; 1min=60sec Work: 1.50/1 x 7 days/1 wk x 24hr/1day x 60 min/1hr x 60sec/1min = 907,000 sec.

How many seconds are in a 1.50 weeks?

True

True or False? Follow the rule of sig figs when making calculations with 2 or more steps.

Conversion Factors

What factors are below? - 60 minutes = 1 hour - 24 hours = 1 day - 100 cm = 1 m - 12 in = 1 ft - 16 oz = 1 lb - 1 inch = 2.54 cm - 1 mile = 5,280 ft

Base Units

What units are below? - Mass in grams (g) - Volume in liters (L) - Length in meters (m)