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.

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.

solidicecream · Answer

A and B are chemical changes but I would go with B.

koikkara · Answer

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anonymous · Answer

Thank you :)