Checking understanding of particles, states of matter and pure substances

5 questions

Assessing knowledge of particle models, states of matter and identification of pure substances.

Questions

1. Which particle model correctly describes the arrangement of particles in a solid?
2. A sample of distilled water that contains only H₂O molecules is an example of:
3. The boiling point of a substance is the temperature at which its particles have enough kinetic energy to overcome intermolecular forces and change from liquid to gas.
4. Which of the following is a pure substance that exists as a gas at room temperature?
5. When a solid melts, which statement about its particles is true?