<u>Answer:</u>
The correct answer option is a. Selenium (Se).
<u>Explanation:</u>
From the given answer options, Selenium (Se) is the only element which is a non metal.
It has the atomic number 34 with atomic weight 78.96. It is a member of the sulfur group of the non metallic elements and falls in period 4 of the Periodic table.
Selenium has non metallic properties which are intermediate between the elements that lie above and below it in the Periodic table.
Answer:

Explanation:
Hello,
In this case, given that the same temperature and pressure is given for all the gases, we can notice that 16.0 mL are related with two moles of carbon monoxide by means of the Avogadro's law which allows us to understand the volume-moles relationship as a directly proportional relationship. In such a way, since in the chemical reaction:

We notice two moles of carbon monoxide yield two moles of carbon dioxide, therefore we have the relationship:

Thus, solving for the yielded volume of carbon dioxide we obtain:

Best regards.
Chunky peanut butter is a mixture which is NOT uniform throughout, so it is a heterogeneous mixture.
Answer: c if im wrong then b if im wrong i dont know what to tell ya
Explanation:
Answer: THe anwser for the first one is Carbon monoxide, Cupric selenide, iron or sulfide, lead dioxide
Explanation: i took these in science ur welcome