Question

question 47
the isotope most likely to be used to study the thyroid gland is
a iodine-131.
b iron-59.
c thallium-201.
d cobalt-60.

question 48
bases reacting with acids form ______ and water.
a buffers
b salts
c new elements
d proteins

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Explanation:

Question 47

The thyroid gland uses iodine for hormone production. Iodine - 131 is a radioactive isotope of iodine, and it is commonly used in medical studies related to the thyroid gland. Iron - 59 is used for studying iron metabolism, thallium - 201 is used for heart - related studies, and cobalt - 60 is used for radiation therapy and industrial applications, not for thyroid studies.

The reaction between an acid and a base is called a neutralization reaction. In a neutralization reaction, an acid (which donates $H^+$ ions) and a base (which donates $OH^-$ ions) react. The $H^+$ and $OH^-$ ions combine to form water ($H_2O$), and the remaining ions (the cation from the base and the anion from the acid) combine to form a salt. Buffers are solutions that resist pH change, new elements are not formed in acid - base reactions, and proteins are biological macromolecules not formed in simple acid - base reactions.

Answer:

A. iodine - 131.

Question 48