Complete the chart below using the periodic table of elements.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

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

How does climate change cause the ocean's thermohaline current to slow down?