Question

Bethany observes a white crystal that is cube shaped under a microscope.



Based on this observation, Bethany thinks the crystal could be sodium chloride, or table
salt. Because the crystal has an extended structure, she knows that sodium chloride is
not a molecule. Bethany uses gray and white spheres, representing the atoms in
sodium chloride, to make a model of the crystal’s most likely structure, as shown.

a. Provide two reasons why the model accurately represents sodium chloride. Support
your reasons with evidence from the model.

b. Predict whether the melting point should be high or low based on the model.

Answer 1

Answer:

In nature there are many different minerals we call "Salts". If you look very closely at the particles of table salt, you will find little cubic crystals. These salt crystals are made of sodium chloride (NaCl), and their cubic shape is due to a very specific arrangement of the atoms. As discussed earlier, all of the minerals classified as salts are held together through ionic bonds. The arrangement of atoms, the shapes of the crystals they form, and their mechanical, thermal, and electrical properties are all due to this special type of bonding

Answer 2

The two reasons why the model shows sodium chloride is that:

• Sodium chloride crystals are cubic in their form as they have crystalline structure.

Why sodium chloride does not exist as molecule?

The other is that:

• Sodium chloride does exist as an aggregates of a bigger number of ions that are oppositely charged as shown using  gray and white spheres.

• The melting point will be high  based on the model as because Sodium chloride is known to have high melting and boiling point.

Note that a lot of Formula unit cannot exist as a single entity. Because of this, compound such as NaCl exist only as an aggregates of a more bigger number of ions that are oppositely charged .

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