How do different elements form compounds?

When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. ... Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).

Explanation: Hope this helps ;)

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.