Lewis Acids.

[405404782 Gabriel Rigole 4F]

What is the best way to determine Lewis acids?

[Jared_Yuge]

Generally in an equation you can look for the more electron deficient molecule of the two assuming its a lewis acid base reaction

[Jacob Motawakel]

Lewis acids are electron acceptors, so the structure or compound that can accept electrons is a Lewis acid.

[Kimberly Koo 2I]

Lewis acids are able to accept electrons, so they are normally electron deficient molecules

[Louise Lin 2B]

Lewis acids are electron acceptors, meaning they usually receive lone pairs. The molecule that is more electron deficient is typically the Lewis acid. On the other hand, Lewis bases are electron donors, so they give away lone pairs.