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I have an exam before that i have to figure out old mistake, please help me 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.

Chemistry
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@Frostbite can you able to help me?
please help me guys :(
If I have to be honest. I don't know because it is a very bad question. If it stood to me it could be all of them.

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Other answers:

Its ok
i am not getting anyone for helps in this group, thats y, i was confused and had to call you
1) strong exothermic 2) relase of a gas 3) exothermic 4) a break in the molecule. If you can follow my drift.
third one ? i guess
could be all as you see.
thank you so much coming for helping me out @Frostbite
Not much help unfortunately, but I hope you0 figure something out. :/
i guess heat

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