Examine the phase change and answer the questions that follow. C2H4(l) → C2H4(g) ΔH = 32.5kJ/moles Is this phase change endothermic or exothermic? How much energy is required to turn 25.0 grams of C2H4 from liquid to gas? Remember in Chem C1 you learned you must ADD energy to go from liquid to gas. How much energy is required when 64.0 grams of C2H4 condenses? Remember in Chem C1 you learned you must REMOVE or LOSE energy to go from gas to liquid.
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.
Examine the phase change and answer the questions that follow.
C2H4(l) → C2H4(g) ΔH = 32.5kJ/moles
Is this phase change endothermic or exothermic?
How much energy is required to turn 25.0 grams of C2H4 from liquid to gas? Remember in Chem C1 you learned you must ADD energy to go from liquid to gas.
How much energy is required when 64.0 grams of C2H4 condenses? Remember in Chem C1 you learned you must REMOVE or LOSE energy to go from gas to liquid.
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