An oxyacetylene torch is used to weld steel. During this process _________energy is converted into --mechanicalchemicalthermalelectrical energy. A. mechanical B.chemical C. thermal D.electrica
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.
An oxyacetylene torch is used to weld steel. During this process _________energy is converted into --mechanicalchemicalthermalelectrical energy.
A. mechanical
B.chemical
C. thermal
D.electrical
When an ice cube (the system) melts, energy flows from the______ --(surroundings OR system )to the --__________(surroundings OR system )and the internal energy of the system --__________ (increases OR decreases OR does not change.)
In a chemical hot pack, iron powder and oxygen react to form iron oxide in the presence of a catalyst. This reaction causes the temperature of the hot pack to increase. This process is --________(exothermic OR endothermic.)
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