Answer:
The gunpowder was invented in the 1200s by the Chinese, who mixed potassium nitrate with carbon and sulfur to generate a substance that would function as the main detonating explosive in firearms. From this invention, the most important nations of each continent that managed to dominate this new technology increased their military capacity compared to the other nations, which instead maintained the old military systems and weapons, such as swords, bows and arrows, etc. In this way, nations like the Ottomans in the Middle East began to use this technology to expand their areas of influence and defeat their enemies.
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:
brainly.com/question/26018275
Police want to take criminals off the streets, prosecutors sometimes make deals with criminals to get someone worse off the streets, and corrections parole these same criminals back out to the streets after they are prosecuted.
The main conflict between state, federal and local offices is jurisdicition. Not sure how to change that.
Answer:
A learned association between two stimuli is central to <u>classical conditioning.</u>
Explanation:
The term <em>classical conditioning</em> refers to a form of learning in which a biologically potent stimulus is linked with a neutral stimulus, creating a new learned response in an animal or a person. This phenomenon, which has greatly impacted behaviorism, was discovered by Russian psychologist Ivan Pavlov. That's why it's also known as Pavlovian conditioning. Pavlov's experiment included a dog, whose salivation was observed. A dog would receive food and, due to the biological response to food, begin to salivate. Before feeding the dog, Pavlov began introducing a clicking metronome (a neutral stimulus), and after a few repetitions, just the sound of the metronome was enough to cause salivation, which is, in this case, a conditioned response. The metronome became a conditioned stimulus. This shows that the dog learned a new behavior.