8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Ionic and Molecular Compounds 4 questions
Ionic and Molecular Compounds
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
An ionic solid consists of a repeating arrangement of charged ions. A molecular solid consists of individual molecules held together by intermolecular attractions.
Question 1
What does NaCl represent in a model of solid sodium chloride?
- One discrete covalent molecule
- The simplest ratio of sodium ions to chloride ions
- Two atoms with no charge in the whole solid
- The number of electrons in the lattice
Question 2
Explain why an ionic compound may conduct when molten even though its solid does not conduct.
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Question 3
Which description fits a sample of pure solid carbon dioxide?
- An array of CO₂ molecules
- An array of separated C⁴⁺ and O²⁻ ions
- A lattice of free electrons and carbon nuclei
- A mixture of elemental carbon and oxygen
Question 4
Explain why dissolving a molecular compound in water does not always make a conducting solution.
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Identifying Two Compound Models 4 questions
Identifying Two Compound Models
Use the information below to answer the questions.
A lab compares two model solids. One consists of ions and the other of neutral molecules. The materials melt without reacting. The table gives their electrical behavior in each state.
| Sample | Solid conductivity | Molten conductivity |
|---|---|---|
| P | Low | High |
| Q | Low | Low |
Question 5
Which sample is consistent with the ionic solid?
- P only
- Q only
- Both samples
- Neither sample
Question 6
Explain why the solid-state measurements alone do not identify the ionic compound.
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Question 7
Which charge carriers account for P’s high molten conductivity in this model?
- Mobile protons released from nuclei
- Mobile positive and negative ions
- Neutral molecules only
- Neutrons moving between molecules
Question 8
A student labels Q molecular. Use both readings to explain why that is a reasonable label in this two-sample model.
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