Answer;
-Negative feedback mechanism
Explanation;
-Negative feedback is a regulatory mechanism in which a 'stimulus' causes an opposite 'output' in order to maintain an ideal level of whatever is being regulated.
-For instance; the maintenance of homeostasis normally involves negative feedback loops. These loops act to oppose the stimulus that triggers them. For example, if your body temperature is too high, a negative feedback loop will act to bring it back down towards the set point, or target value (normal value).
The answer: less frequency, causing the pitch to be lowered.
This is known as the Doppler effect. When you have an object that is producing sound while moving, the side that it is moving towards to will have waves that will become a bit more squished together, while the other side that it is moving away from will have waves that are spaced a bit more apart from each other. The only determining factor in this is the magnitude of the speed, so the faster the object is moving towards or away from you, then the more severe pitch change the object will have.
In this case, it's just asking in general what would happen if the horn was moving away from you while it was giving off sound waves. Therefore, since it is moving away from you, its sound waves are a bit further apart, resulting in a lowered frequency and pitch.
Answer: 0.45 moles of 
will be produced from 0.15 moles of propanol.
Explanation:
The balanced chemical reaction is:
is the limiting reagent as it limits the formation of product and 
is the excess reagent.
According to stoichiometry :
2 moles of produces = 6 moles of
Thus 0.15 moles of 
will produce=
of
Thus 0.45 moles of will be produced from 0.15 moles of propanol.
Answer:
Lava is hot liquid rock. When lava flows over solid ground, the solid ground beneath it increases in temperature. What happens to the molecules in the solid ground when the temperature is increasing? The energy of the molecules in the ground decreases.
