106k views
3 votes
Which is the most important question for deciding if a chemical reaction has occurred?

Was there a change in the size?
Was any heat energy given off?
What is the density of the substance?
What is the texture of the substance?

User Avivr
by
8.6k points

2 Answers

6 votes

Answer:

all these are physical properties except release of heat so it's probably heat energy given off

User Msgre
by
9.3k points
1 vote

Answer:Was any heat energy given off?

Step-by-step explanation:

A chemical reaction may exothermic (heat is given off) or endothermic (heat is absorbed). Size, density or texture of the substance are strictly physical properties which cannot confirm that a chemical reaction has transpired in the sample. The evolution of heat ultimately confirms that a chemical process has taken place.

User Greenimpala
by
6.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.