Question

To demonstrate chemical change.

Answer 1

Explanation:

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Answer 2

Answer:

The following can indicate that a chemical change has taken place, although this evidence is not conclusive:

• Change of odor.
• Change of color (for example, silver to reddish-brown when iron rusts).
• Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
• Change of composition - paper turning to ash when burned.
• Light and/or heat given off.
• Formation of gases, often appearing as bubbles in liquids.
• Formation of a precipitate (insoluble particles).
• The decomposition of organic matter (for example, rotting food).
• The change is difficult or impossible to reverse.