Question

read the passage and answer the following question(s). passage 2122 directions: the table below shows the melting and boiling points of six different materials. use the table to answer any questions that follow. material melting point (°c) boiling point (°c) phosphorus 44 280 sodium 98 883 rubidium 39 688 iodine 114 184 potassium 64 774 arsenic 81 613 question 9. which material from the table is a liquid at 50°c and a gas at 300°c? a. iodine b. rubidium c. phosphorus d. potassium

Explanation:

Step1: Recall state - change rules

A substance is liquid when temperature is between melting and boiling points.

Step2: Check iodine

Melting point of iodine is 114°C and boiling point is 184°C. At 50°C it is solid (below melting point), at 300°C it is gas (above boiling point).

Step3: Check rubidium

Melting point of rubidium is 39°C and boiling point is 688°C. At 50°C it is liquid (above melting point) and at 300°C it is liquid (below boiling point).

Step4: Check phosphorus

Melting point of phosphorus is 44°C and boiling point is 280°C. At 50°C it is liquid (above melting point) and at 300°C it is gas (above boiling point).

Step5: Check potassium

Melting point of potassium is 64°C and boiling point is 774°C. At 50°C it is solid (below melting point), at 300°C it is liquid (below boiling point).

Answer:

C. phosphorus