Refer to the following phase diagram (not to scale!) for neon: 26.2 P 1.00 atm 0.425 24.4 24.5 27.1 44.4 T Kelvin A sample of neon at a pressure of 0.425 atm and a temperature of 37.8 K is compressed at constant temperature to a pressure of 29.8 atm. Which of the following are true? Choose all that apply The sample is initially a gas. The sample is initially a solid. The final state of the substance is a liquid. The liquid initially present will vaporize. One or more phase changes will occur.

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A: Boiling point = - 11◦C   In Kelvin = (- 11 + 273.15) K                 = 262.15 K

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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.