The reaction between ethanol C2H5OH and water H2O is a chemical reaction and is exothermic.
Option A is correct.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a rearrangement between the ions and molecules of a substance. For a chemical reaction to take place, bonds are broken in the reactants and new bonds are formed in the products.
The chemical reaction between ethanol and water is;

- This reaction is exothermic because molecules move from a higher state of energy to lower states.
- The resulting volume is also lesser than the initial volumes of the reactants according to Henry's Law, showing that heat is given off to the walls of the container.
Therefore, we can conclude that A chemical reaction occurs, as evidenced by the volume of the resultant mixture being less than the total volume of the initial components.
Learn more about the chemical reaction here:
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Mount saint helen is an active stratovolcano and it was formed due to the subduction of the Juan de fuca plate.
Answer:
D. decrease in the price of MP3 players
Explanation:
The above is the correct answer.
"Ceteris paribus" is a Latin phrase which means "all else being equal". The decrease in the price of MP3 players is the changes that does NOT violate ceteris paribus.
The selected option is talking about MP3 player. The MP3 player doesn't fit into the demand for CD players. It is the odd there which doesn't violate.
Option D is the correct answer.
C, encoding difficulties as he struggles to store the information within the brain and recall for the short or long term