Question

1. the graph shows the phase diagram for a substance q, temperature against pressure. which list labels the regions and identified points of the graph correctly?
2. if too much carbon is added, the steel becomes too brittle. this tells us that too much carbon reduces steel’s

a. ductility
b. conductivity.
c. luster
d. surface tension.

Explanation:

Question 9

To solve this, we recall phase diagram concepts. A phase diagram shows regions of solid, liquid, gas and the triple point (where all three phases coexist). The lines separate regions: the left - most region (low temp, high pressure) is solid, the region between the two lines (moderate temp and pressure) can be analyzed. The triple point is where the three phase - boundary lines meet. Region 1: low temperature, relatively high pressure, so solid. Point 2: where the lines meet, triple point. Region 3: high temperature, low pressure, so gas. Region 4: moderate - high temperature and pressure, so liquid. So option A (1: solid; 2: triple point; 3: gas; 4: liquid) matches.

Ductility is the ability of a material to be deformed without breaking (like being drawn into wires). Brittleness is the opposite - the material breaks easily. If too much carbon makes steel brittle, it reduces its ductility. Conductivity is about heat/electricity transfer, luster is about shine, surface tension is a liquid property. So the answer is related to ductility.

Answer:

A. 1: solid; 2: triple point; 3: gas; 4: liquid

Question 10