Question

why is a change in temperature evidence that a chemical change has taken place? a change in temperature is a physical change, not chemical change. energy is absorbed as something new is created. energy is released but nothing new has been created. energy is released as a new substance is created. multiple choice 1 point. two chemicals are combined, and light is produced. this is an example of: what happens in a light bulb when it is turned on. a physical change. a chemical change. a chemistry experiment.

Explanation:

1. In a chemical change, new substances are formed. Energy is either absorbed (endothermic) or released (exothermic) during the formation of new substances, which can cause a temperature change. A physical change only alters physical properties like state, shape etc., not the chemical composition. So a temperature - change can be evidence of a chemical change because energy is released or absorbed as a new substance is created.
2. When two chemicals are combined and light is produced, it is a chemical change. In a chemical change, chemical bonds are broken and new bonds are formed, often accompanied by energy changes such as light production. A physical change does not involve the formation of new substances and light production in a chemical combination is not the same as what happens in a light - bulb (which is an electrical - to - light energy conversion). A chemistry experiment is a general term for a procedure, not a description of the type of change.

Answer:

1. Energy is released as a new substance is created
2. a chemical change