Question

question 1 - 11
as mia mixed two substances in a test tube, she noticed that the test tube became warm. she also noticed gas coming from the test tube. based on mias observations, what was most likely occurring inside the test tube?
the two substances underwent a physical change
the two substances were melting
the two substances formed a new substance
the two substances had a change of state

Explanation:

When two substances are mixed and there is a temperature change (the test tube became warm) and gas is produced, these are signs of a chemical reaction. A chemical reaction results in the formation of a new substance. A physical change (like melting or a change of state) does not produce a new substance. Melting is a physical change where a solid turns to a liquid. A change of state (e.g., solid - liquid - gas) is also a physical change.

Answer:

The two substances formed a new substance.