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Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

$1 - $5 per group Ages 8 - 18 5 to 10 minutes
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You just ate a big meal and feel heartburn coming on. You take an antacid and feel better. Why? Heartburn is caused by stomach juice (an acid) burning the esophagus.

$5 - $10 per group Ages 11 - 18 30 to 45 minutes