1. Sample A weighs 30.00 g and displaces 15.00 mL of water. Sample B weighs 20.00 g and displaces 30.00 mL of water. Which of the two samples is denser? Which of the two samples will float on water? 2. What product was formed after the combustion of a magnesium strip? What kind of inferences can be made from the result of a litmus paper test about the physical / chemical properties of the residue? 3. Research the molecular composition (molecular formula) of both ethanol and DCM. Describe at least two similarities and differences in their physical properties and another two differences in their chemical properties.
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.
1. Sample A weighs 30.00 g and displaces 15.00 mL of water. Sample B weighs 20.00 g and displaces 30.00 mL of water. Which of the two samples is denser? Which of the two samples will float on water?
2. What product was formed after the combustion of a magnesium strip? What kind of inferences can be made from the result of a litmus paper test about the physical / chemical properties of the residue?
3. Research the molecular composition (molecular formula) of both ethanol and DCM. Describe at least two similarities and differences in their physical properties and another two differences in their chemical properties.
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