Which of the following is a chemical change?
a. a solution of salt water being diluted as water is added to it.
b. a rock eroding as the wind removes particles from it.
c. soil drying as water evaporates.
d. silver tarnishing as the silver metal reacts with sulfur
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Ответ:
D. silver tarnishing as the silver metal reacts with sulfur
Explanation:
A chemical change occurs when the identity of a substance is changed. Silver tarnishing is a chemical change because silver and sulfur react to form a new substance, silver sulfide. In the other examples, the substances have not changed their identity and only physical changes have occurred.
Ответ:
The adrenal gland
Explanation:
The adrenal gland which is located above the kidneys produces adrenaline, a stress hormone that invokes a flight-or fight-response in the body. The body will experience increased heartbeats, tightened muscles, dilated pupils, and sweating. This gland is under the regulatory influence of the hypothalamus-pituitary-adrenal (HPA) axis.