Bubbles being produced is an example of?

Flammability is an example of?

Click all of the following that is an example of a chemical sign.

Change in smell is an example of?

The color of a substance is an example of?

The pH level of a substance is an example of?

Journey scratched a rock of a streak plate and it left a black mark. She then dropped some hydrochloric acid on the rock and it started to bubble and changed to a rotten egg smell. Which are signs that tell you a chemical reaction occurred?

Bobby added a yellow powder to a clear, cold liquid. The powder dissolved in the liquid. After a few seconds, the liquid become hot, turned green, and bubbles were forming in the liquid. Click all the properties the substances had BEFORE the reaction.

Bobby added a yellow powder to a clear, cold liquid. The powder dissolved in the liquid. After a few seconds, the liquid become hot, turned green, and bubbles were forming in the liquid. Click all the properties the substances had AFTER the reaction.

Bobby added a yellow powder to a clear, cold liquid. The powder dissolved in the liquid. After a few seconds, the liquid become hot, turned green, and bubbles were forming in the liquid. Click all the chemical signs during the reaction?

How should the following molecule be drawn CH₄

How should you draw the following molecule - 2O₂