Question

A scientist is performing an experiment on a powder. Which of the following is a sign that a chemical change has definitely occurred during his experiment?

The powder catches on fire.
The powder releases bubbles.
The powder heats up.
The powder breaks apart into smaller particles.

Answer 1

The answer would be that the powder would catch fire

Step-by-step explanation:

The reason as to why this is the case is because all the other options are not guaranteed to be a result of a chemical change. However, an substance's flammability is a universal result of a chemical change, regardless of the substance.

Answer 2

The best and most correct answer among the choices provided by the question is the first choice "the powder catches fire"

Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical: iron rusting (iron oxide forms) gasoline burning (water vapor and carbon dioxide form)


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