Naphthalene, C10H8, has normal melting and boiling points of 81°C and 218°C, respectively. The triple point of naphthalene occurs at 80°C and 7.50 torr. What physical change can be observed - if any - when the temperature of a naphtalene sample is increased from 25°C to 85°C at a constant pressure of 720 torr?
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.
- no physical change occurs - the sample is liquid and stays liquid
- liquid to gas
- solid to liquid
- no physical change occurs- the sample is solid and stays solid
- solid to gas
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