<p> INVESTIGATING ALKA-SELTZER</p><p>INVESTIGATION #1 (GROUP TEST) •FILL A TEST TUBE ONE FOURTH FULL WITH WATER. •DROP IN ONE FOURTH OF AN ALKA-SELTZER TABLET AND OBSERVE. •WHEN ALKA-SELTZER IS ABOUT HALF DISSOLVED, COVER THE TEST TUBE OPENING TIGHTLY WITH YOUR FINGER OR PALM. WAIT A FEW MOMENTS. DESCRIBE WHAT YOU FEEL. •HOLD THE BOTTOM OF THE TEST TUBE-DESCRIBE WHAT YOU FEEL. </p><p>INVESTIGATION #2 •CRUSH ONE FOURTH OF THE ALKA-SELTZER. OBSERVE THE PIECES WITH THE HAND LENS. DESCRIBE WHAT YOU SEE.</p><p>INVESTIGATION #3 PLACE ONE FOURTH OF THE ALKA-SELTZER IN A CLEAR PLASTIC CUP. ADD ENOUGH WATER TO COVER THE TABLET. WAIT UNTIL THE TABLET IS JUST ABOUT DISSOLVED AND THEN PLACE A BURNING MATCH OR BURNING CANDLE INTO THE CUP. DO NOT LET THE MATCH TOUCH THE LIQUID OR FOAM. DESCRIBE WHAT OCCURS. REPEAT AGAIN AFTER 2 MINUTES. WHAT HAPPENED? WHY? INVESTIGATION #4 PLACE ONE FOURTH OF THE ALKA-SELTZER ON A PIECE OF FOIL. DROP SOME CABBAGE JUICE ON THE ALKA-SELTZER. DESCRIBE WHAT HAPPENED.</p><p>INVESTIGATION #5 USE THE REMAINING ONE FOURTH OF THE ALKA-SELTZER TO INVESTIGATE ANY PROPERTIES YOU WISH. DESCRIBE WHAT YOU DID AND WHAT HAPPENED. </p>