Question

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.

Answer 1

@Frostbite can you able to help me?

Answer 2

please help me guys :(

Answer 3

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.

Answer 4

Its ok

Answer 5

i am not getting anyone for helps in this group, thats y, i was confused and had to call you

Answer 6

1) strong exothermic
2) relase of a gas
3) exothermic
4) a break in the molecule.

If you can follow my drift.

Answer 7

third one ? i guess

Answer 8

could be all as you see.

Answer 9

thank you so much coming for helping me out @Frostbite

Answer 10

Not much help unfortunately, but I hope you0 figure something out. :/

Answer 11

i guess heat