Question

Which of the following would indicate that a chemical change might be occurring

Answer 1

Explanation:

During a chemical change, a new kind of matter is formed. Examples are combustion, rusting of iron, precipitation and souring of milk.

Here are some of the properties of chemical change:

• They are not easily reversible
• It leads to the production of new kinds of matter.
• It involves change in mass.
• It requires a considerable amount of energy.

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Answer 2

Answer:

The options are missing in the question, so I am going to answer it in a general way.

There are several indicators of chemical reactions. They are:

• Gas Bubbles Appear

• Formation of a Precipitate

• Color Change

• Temperature Change

• Production of Light

• Volume Change

• Change in Smell or Taste

Depending of what kind of reaction is occurring which indicator appear. For example in combustion reactions the temperature increase because they are highly exothermic; and in electrolysis of water, bubbles of molecular oxygen and molecular hydrogen are generated.