Pure sodium metal placed in water will spark and ignite, as well as form bubbles and gas. What are the signs that this is a chemical reaction? Check all that apply.Heat is produced.Light is produced.Heat is absorbed.Bubbles appear. A precipitate forms.The color changes.

Sodium reacts with water, releasing heat and producing sparks or flames, so heat and light are produced. The bubbles are hydrogen gas, which is evidence that a new substance forms. Heat is not absorbed, and no precipitate or color change is described.

AI-written and checked against the verified answer.