Heating Curve for Water from -35C to 115C 140 120 100 80 60 40 water 20 0. 10 20 30 40 50 60 70 80 -20 -40 -60 Heat Added (kl) (a) Mark an X on the section of the graph that depicts ice melting. (b) Using the graph, calculate the mass of H2O that this data was calculated for. Please use two significant figures in your answer. Temperature (Degrees Celcius)

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Q: 24. At what temperatures will a reaction be spontaneous if A,H° = - 62.4 kJ and A,S -301 J/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.