States of Matter and Changes of State Quiz
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5 questions, one answer each
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1. In which state are particles arranged in a regular pattern and vibrate in fixed positions?
- A. Gas
- B. Liquid
- C. Solid
- D. Plasma
2. What does the state symbol (l) mean in a chemical equation?
- A. Liquid
- B. Large
- C. Low concentration
- D. Light
3. Why do ionic compounds have high melting points?
- A. They contain weak intermolecular forces only
- B. Strong electrostatic forces act between ions in all directions throughout the giant lattice
- C. They are made of small, separate molecules
- D. Their electrons are delocalised throughout the structure
4. A solid ionic compound does not conduct electricity, but the same compound conducts well once melted. Why?
- A. Melting destroys the ions
- B. In the solid, ions are fixed in place; once molten, ions are free to move and carry charge
- C. Melting converts the compound into a metal
- D. Solids never conduct regardless of bonding type
5. Substance X is a small molecule with a very low boiling point, while substance Y is a giant covalent structure with an extremely high melting point. Which explanation correctly accounts for this difference?
- A. X has stronger covalent bonds than Y
- B. X only requires weak intermolecular forces to be overcome to boil, while Y requires many strong covalent bonds throughout its structure to be broken to melt
- C. Y is ionic while X is covalent
- D. X conducts electricity while Y does not, which explains the difference in melting/boiling point