17. The figure below shows how the temperature of a substance changed as it was heated. Which segment of the graph indicates that the substance was undergoing a change of state? * Change in Temperature of a Substance Over Time D B Time а. А b. B С. С d. D 18. Baguio is a famous tourist destination in the Philippines. People enjoy the cold ambiance as the place is covered by ground-level fog. Which of these could have caused the formation of fogs? * a. Molecules of gas changed into liquid b. Molecules of gas changed into a gas C. Molecules of liquid changed into a gas d. Molecules of solid changed into a gas 19. A pot of water is placed on a hot stove. Small bubbles begin to appear at the bottom of the pot. The bubbles rise to the surface of the water and seem to pop or disappear. What are the bubbles made of? * а. air b. carbon and oxygen C. heat d. oxygen and hydrogen Temperature

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Q: O MgBr 1) H₂O H₂SO4 2) HCI/H₂O 1) BH3/THF 2) H₂O₂/NaOH / H₂O

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Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.