Effervescent Reaction Lab (How Does Surface Area Affect How Fast an Effervescent Tablet Dissolves?)

Description

Three activity sheets ready — each follows the same nature-of-science structure (hypothesis → variables → procedure → data → analysis → conclusion → reflection), just with different variables to explore: 1. Temperature (red) — cold vs. room vs. warm water, timing Alka-Seltzer dissolving. 2. Surface Area (amber) — whole vs. halved vs. crushed tablet, timing dissolving. 3. Baking Soda + Vinegar (green) — 1 vs. 2 vs. 3 teaspoons of baking soda, measuring both fizz time and fizz height. Each includes: Key Words (hypothesis, independent/dependent/controlled variable, reliable), a variables identification table for students to fill in, a procedure numbered 9–10 steps, a data table, 6 post-lab questions that push on hypothesis testing, reliability, and conclusions, and a 5-prompt reflection. Pick whichever matches what you have on hand — or run one as a class demo and the others in stations.