Which statement describes the law of conservation of energy? A. Energy is destroyed during an energy transformation. B. Energy cannot be transformed. C. Energy cannot be created or destroyed. D. Energy can only be created, not destroyed. SUOMI

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?