Which of the following is a mixture? sand silicone silicon dioxide carbon dioxide

What is avogadro’s number, and why is it useful

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: