When you crush a first-aid pack for an injured athlete and the pack gets cold, which of the following is true?
2 answers:
Answer: Option (d) is the correct answer.
Explanation:
A chemical reaction in which heat is released by the reactants is known as an exothermic reaction.
For example,
As energy is released, hence total energy of products is less than the total energy of reactants in an exothermic reaction.
On the other hand, a chemical reaction in which heat is absorbed by reactant molecules is known as an endothermic reaction.
For example,
As energy is absorbed, hence total energy of reactants is less than the total energy of products in an endothermic reaction.
Thus, we can conclude that when you crush a first-aid pack for an injured athlete and the pack gets cold, a chemical change has occurred, with energy being absorbed.
You might be interested in
Answer: Option (3) is the correct answer.
Explanation:
When a linear chain of carbon and hydrogen atoms is attached by single bonds only then it is known as alkane.
When a linear chain of carbon and hydrogen atoms contains a double bond then it is known as alkene.
When a linear chain of carbon and hydrogen atoms contains a triple bond then it is known as alkyne.
Therefore, in the given description there is a double bond between third and fourth carbon. Hence, the IUPAC name of given compound is 3-heptene.
