Practice Quiz

Praxis II General Science

Category - Major Ideas

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John is now trying out his first chemistry experiment. He is given a sample of phosphorus, which is a solid at room temperature. John slowly heats the phosphorus from room temperature to 200°C. Which of the following will likely occur during this experiment?
  1. The phosphorus will freeze.
  2. The phosphorus will sublimate.
  3. The phosphorus will catch on fire.
  4. The phosphorus will break down in magnesium oxide and sodium chloride.
  5. The phosphorus will turn into a liquid.
Explanation
Answer: E - The phosphorus will likely turn into a liquid when heated to 200°C. Phosphorus has a melting point of around 50-60°C, depending on the purity of the compound. The phosphorus should not turn into a gas or catch on fire until a much higher temperature!
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