Answer:
There are signs that a chemical reaction occurs. Bubbles form, a gas is given off, and the beaker gets very hot. The most important sign that a chemical reaction occurs is the formation of new substances. The new substances are carbon, a brittle black solid, and water vapor, a colorless gas.
Explanation:
The chemical changes in the component indicate a new substance has been formed.
Change in the chemical composition of the substances refers to the chemical change in the object. For example: burning paper is kind of the chemical change. The burning paper will turn into ashes. Thus it forms the new component.
Change in the chemical composition leads to the change in color, odor change, temperature change, gas formation etc. the color change and bubbles formation is evidence of new substance formation.
Thus chemical change indicate i.e. change in color and bubbles the formation of new substances.
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