8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Network Solids and Discrete Molecules 4 questions
Network Solids and Discrete Molecules
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
In a covalent network solid, bonds connect atoms through an extended structure. A molecular solid contains separate molecules with intermolecular attractions between them.
Question 1
Which description represents a covalent network solid?
- Many atoms linked by covalent bonds through the material
- Isolated molecules with weak attractions between them
- A gas with no bonds or interactions
- A solution containing only free ions
Question 2
Explain why melting a molecular solid can leave its molecules intact.
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Question 3
What can a formula such as SiO₂ tell you in a model of a covalent network?
- The ratio of Si atoms to O atoms
- That the network must contain separate three-atom molecules
- That there are only two total atoms in the solid
- That all bonds in the solid are ionic
Question 4
Why can breaking apart a covalent network require a much higher temperature than melting a simple molecular solid?
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Comparing Model Solid Structures 4 questions
Comparing Model Solid Structures
Use the information below to answer the questions.
The table describes model solid structures and their measured melting behavior at the same pressure.
| Sample | Structure description | Melting behavior |
|---|---|---|
| P | Atoms linked by covalent bonds through the material | Melts only at very high temperature |
| Q | Separate neutral molecules with attractions between molecules | Melts at low temperature |
| R | Positive and negative ions in a repeating lattice | Melts at high temperature |
Question 5
Which sample is a covalent network solid?
- P
- Q
- R
- All three
Question 6
Identify the molecular solid and explain how its structure accounts for its lower melting temperature in this comparison.
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Question 7
Which observation is shared by P and R and therefore cannot distinguish a covalent network from an ionic lattice by itself?
- High melting temperature
- Separate neutral molecules
- Positive and negative ions in a lattice
- Extended covalent bonds
Question 8
A student says P and R must have the same bond type because both have high melting temperatures. Use the structures to evaluate the claim.
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