Question

question 2
why does rubber not form crystals when it solidifies?
it melts and reforms into sharp - edged shapes
its atoms are not arranged in a repeating pattern
it cools too slowly to form a solid
it is made of crystals that are too small to see
question 3
what makes crystalline solids like salt or quartz stronge
the repeating atomic structure holds them together tightl

Explanation:

QUESTION 2

To determine why rubber does not form crystals when it solidifies, we analyze each option:

• "It melts and reforms into sharp - edged shapes": This description does not relate to the non - crystalline nature of rubber. Crystalline solids have a repeating atomic pattern, and this option's description is incorrect for rubber.
• "Its atoms are not arranged in a repeating pattern": Crystalline solids are defined by a repeating (periodic) arrangement of atoms, ions, or molecules. Rubber is an amorphous solid, and in amorphous solids, the atomic arrangement lacks this repeating pattern. This option correctly explains why rubber does not form crystals.
• "It cools too slowly to form a solid": Rubber does solidify, just not into a crystalline structure. The rate of cooling is not the reason for its non - crystalline nature.
• "It is made of crystals that are too small to see": Rubber is amorphous and does not have crystals, regardless of their size.

For crystalline solids like salt (ionic crystal) and quartz (covalent network crystal), the repeating atomic structure is crucial. In a crystalline solid, the atoms, ions, or molecules are arranged in a regular, repeating lattice. This regular arrangement allows for strong interatomic or intermolecular forces to act throughout the structure. For example, in ionic salts, the strong electrostatic forces between ions are enhanced by the regular lattice, and in covalent network crystals like quartz, the covalent bonds are part of a continuous, repeating network. The repeating atomic structure holds the particles together tightly, which gives the crystalline solid its strength.

Answer:

B. Its atoms are not arranged in a repeating pattern

QUESTION 3 (assuming the full question is "What makes crystalline solids like salt or quartz strong?")