Referring to the phase diagram for CO2 shown below, which of the following best describes the phase changes that occur when the temperature of CO2 is increased from -100°C to 25°C at a pressure of 5atm.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Choose one:
A. The solid warms until it reaches -59 °C when it sublimes to a gas and remains a gas
B. The CO2 melts at –57°C and remains a liquid until 25°C.
C. The CO2 melts at –30°C and remains a liquid until the temperature hits 20°C at which point it boils and becomes a gas.
D. The CO2 becomes a gas at 25°C.
E. The CO2 becomes a gas at 31°C.
F. The CO2 sublimes at –25°C and remains a gas.
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