A. A sign above a supermarket display of oranges reads: Organic Produce
No chemicals were used to harvest this fruit!
How accurate is this claim? Why or why not?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?