Bonding Diagrams as Models and Their Limitations Flashcards

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What is a bonding diagram (or model) in chemistry?

It is a drawing that shows how atoms or ions are arranged and joined.

Why are bonding diagrams only models and not exact pictures of substances?

They are simplified. They are not to scale and do not show real sizes or distances.

What is one limitation of dot-and-cross diagrams for ionic compounds like sodium chloride?

They often show only a few ions, not the whole giant lattice in three dimensions.

What is one limitation of dot-and-cross diagrams for covalent molecules like water?

They do not show the real 3D shape or bond angles of the molecule.

What is one limitation of using different dots and crosses for electrons in dot-and-cross diagrams?

They suggest electrons from different atoms are different, but in reality all electrons are the same.

What is a 2D bonding diagram and what is one limitation of it?

It is a flat drawing of atoms and bonds. It cannot show the full 3D shape.

What is a ball-and-stick model and what is one main advantage of it?

It uses balls for atoms and sticks for bonds. It helps show the 3D arrangement and bond angles.

What is one limitation of ball-and-stick models for giant structures like ionic lattices or metals?

They show big gaps between particles, but in real solids the particles are packed close together.

What is one limitation of diagrams that show atoms or ions as solid spheres?

They make atoms look like hard balls, but atoms are mostly empty space with tiny nuclei and electron clouds.

Why is it useful to know the limitations of bonding diagrams?

It stops us taking the drawings too literally and helps us avoid wrong ideas about real structures.