Mingala ba! Do Now: Take out HW and stampsheet Answer Q below in notes. How many sig figs in each number and state the reason why?  All digits count Leading 0’s don’t Trailing 0’s do 0’s count in decimal form 0’s don’t count w/o decimal All digits count 0’s between digits count as well as trailing in decimal form

Scientific Notation Make the following into a 3 Sig Fig number 1, ,700, , x x x x  10 -5

Multiplication and division  1.54 =  =  =  10 6  =     = 

__ ___ __ Addition and Subtraction = = = – = Look for the last important digit

Solve each of the following problems. Show the correct set-up and always use units. 1. Determine the number of mm in 1600 m. 2. Convert 2875 dL to liters. 3. Convert 2500 mL of hydrochloric acid (HCl) to L of HCl. 4. Convert kg sulfur (S) to g of S 5. Convert 150 mg of acetylsalicylic acid (aspirin) to g of aspirin.

1. Convert 5.2 x Mm of magnesium (Mg) ribbon to mm of Mg ribbon 2. Convert kg of tin (Sn) to mg of Sn 3. Convert 26.7 cm of copper (Cu) wire into dm of Cu wire. 4. Convert 0.50 g of sodium (Na) to nanograms of Na