Question

which of the following solid substances can be liquefied simply by increasing the pressure suffciently? diamond (c) graphite (c) dry ice (co2) sulfur (s) ice (h2o)

Answer 1

Dry ice (solid CO2) can be transformed into a liquid by applying sufficient pressure, unlike the other substances listed (diamond, graphite, sulfur, ice) which have different properties and require different conditions for liquefaction.

Step-by-step explanation:

The question asks which of the solid substances provided can be liquefied simply by increasing pressure sufficiently. The substances listed are diamond (C), graphite (C), dry ice (CO2), sulfur (S), and ice (H2O).

Of these, dry ice (solid CO2) can be liquefied by increasing the pressure. Normally, at atmospheric pressure and temperatures above -78℃, dry ice sublimes, transitioning directly from a solid to a gas without passing through the liquid phase. However, if sufficient pressure is applied, CO2 can be converted into a liquid before it sublimes.

This property is illustrated in the phase diagram for carbon dioxide, which shows a positive slope for the solid-liquid equilibrium line and a triple point above atmospheric pressure. Thus, only under conditions of high pressure and above the temperature of -78℃ can dry ice be turned into liquid CO2.

Answer 2

dry ice (co2)

Step-by-step explanation:

Dry ice is the solid form of carbon dioxide (CO2) and is commonly used as a cooling agent. It sublimates (converts directly from a solid to a gas) at atmospheric pressure, meaning that it does not melt into a liquid form under normal conditions.

However, dry ice can be liquefied by increasing the pressure sufficiently while keeping the temperature below -78.5°C (-109.3°F), which is the critical temperature and pressure of CO2. At this point, the gas and liquid phases of CO2 become indistinguishable, and the substance is referred to as a supercritical fluid.

In contrast, diamond (C), graphite (C), sulfur (S), and ice (H2O) cannot be liquefied simply by increasing the pressure. Diamond and graphite are both forms of carbon and are extremely hard and have high melting points, which makes it difficult to liquefy them under normal conditions. Sulfur has a low melting point, but it still requires heating to melt it into a liquid form. Ice can be melted into liquid water by heating it, but simply increasing the pressure will not cause it to liquefy.