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suppose you are an inventor who just build a device that will lift heavy objects using an electromagnet. write a description for your product's brochure that explains how the magnet can move heavy objects.

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?