• 2 antacid tablets
• spoon or something you can use to crush a tablet
• 2 clear cups (tall and thin work best)
• 2 additional cups (any type)
• water
• food coloring

1. Place a whole antacid tablet into one of the tall, thin, dry cups. Crush the second tablet and place it in the other cup.
2. Fill the remaining 2 cups with 1/2 cup of water each. Add 1 drop of food coloring to each.
3. On the count of three, dump the liquid into each of the cups with antacid.
4. Which one reacts faster?

One of the tablets reacted faster because:

There was more antacid.
There was more surface to react with the water.
There was more water in one of the cups.

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