When potassium iodide liquid is poured into lead nitrate solution (both clear solutions), a bright yellow solid, lead iodide, forms in a potassium nitrate solution. What are the signs that this is a chemical reaction? Check all that apply.

A bright yellow solid forming in two clear solutions is evidence that a precipitate forms, so E applies. The mixture also changes appearance from clear to yellow, so F applies. The question gives no evidence of heat, light, or bubbles being produced, or heat being absorbed.

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