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What do understand by glass transition temperature. Explain whether it is exothermic or endothermic?
glass transition is a change in state. when the state changes from crystalline or rather glassy to a rubbery like state. it should be noted that it is not melting. it is a state change and not a phase change. it is endothermic phenomena because heat is given to a system so that glass transition occurs. because no heat is released during the process it can not be considered to be endothermic.
What is the thermochemical equation for endothermic changes?
A + B + Heat → C, ΔH > 0
Is glasstransition exothermic or endothermic?
Glass transition is an endothermic process, meaning it absorbs heat from its surroundings to occur. This transition involves the transformation of an amorphous solid material from a rigid state to a rubbery state as it is heated.
Is sublimation exothermic or endothermic?
Sublimation is an endothermic phase transition from solid to gaseous state.
Physical and chemical changes can be either exothermic or endothermic changes?
The two terms are probably used most often to describe chemical reactions - whether or not they absorb or require heat (endothermic) or create release heat (exothermic). However, since the terms simply mean "absorbing heat", and "giving off heat", they can be used to describe any such event, physical, chemical or nulear. Ray
Which state changes are exothermic and endothermic?
freezing is exothermic, melting is endothermic, evaporation is endothermic, condensation is exothermic.
The change in which ice absorbs energy and melts is?
An endothermic change; or a change of state. Endothermic because it absorbs energy. Change of state because ti changes from a solid to a liquid.
What is the difference between ectothermic and endothermic?
endothermic is when something changes from to hot to cold and ectothermic is when something changes from cold to hot.
What are 2 phase changes that are endothermic or absorbing energy?
Two phase changes that are endothermic or absorbing energy are melting (solid to liquid) and vaporization (liquid to gas). During these phase changes, energy is absorbed to break the intermolecular forces holding the particles together, allowing them to move more freely in their new state.
What contrast endothermic and exothermic changes?
Exothermic: release of heat Endothermic: absorption of heat
Which of the changes boiling freezing and condensation is endothermic?
For boiling energy is needed, so it's endothermic.
A change of state reaction that absorbs energy is endothermic?
yes it is endothermic
What are the phase changes that are endothermic?
For example melting or boiling.
A change in matter in which energy is taken in is an endothermic change?
Endothermic changes are processes where energy is absorbed by the system from its surroundings. This results in a decrease in temperature in the surroundings during the process. Examples include melting ice and evaporating water.
What is the relationship between endothermic reactions and temperature changes?
Endothermic reactions absorb heat from their surroundings, causing a decrease in temperature.
What are the changes of endothermic?
Electrolysis of water to oxygen and hydrogen gas
What are the three phase changes?
The 3 types of endothermic phase changes are the movement from solid to liquid, the movement from liquid to gas, and the movement form gas to plasma. Endothermic is the absorbing of heat.
