An unknown substance undergoes a chemical change that gives off heat. What can you tell me about this substance?
2 answers:
Explanation:
A chemical reaction in which heat is absorbed by the reactant molecules is known as an endothermic reaction.
For example,
On the other hand, a chemical reaction in which heat energy is released by the reactant molecules is known as an exothermic reaction.
For example,
Thus, we can conclude that when an unknown substance undergoes a chemical change that gives off heat then it means earlier the substance has more heat energy but after the chemical change there occurs a decrease in its heat energy because some of the heat has been released by it.
You might be interested in
Answer: False
Explanation: There are four carbon atoms , eight hydrogen atoms and two Bromine atoms.
As the carbon forms four covalent bonds, every carbon must have four bonds and thus the formula of the compound is .
IUPAC name of the compound is 1,2 di-bromobutane. As the carbon chain is 4 atoms long the word used is but and all the bonds are single bonds, thus the suffix used is ane.