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Sagot :
1) Catalysts help to facilitate a reaction by lowering activation energy, but are not used up in this reaction. Eventually, however, they will need replacing as they become less efficient.
2) Thermosoftening polymers only hold their rigid shape in cooler conditions, if hot food is placed in them the polymer will soften (effecively melt). This is because there is little attraction between the polymer chains in a themosoftening polymer so they move easily when heat is added.
2) Thermosoftening polymers only hold their rigid shape in cooler conditions, if hot food is placed in them the polymer will soften (effecively melt). This is because there is little attraction between the polymer chains in a themosoftening polymer so they move easily when heat is added.
1) catalysts are not used up in reactions
2) thermosoftening polymers have weak intermolecular forces which quickly makes them melt and break away from bonds holding them together.
2) thermosoftening polymers have weak intermolecular forces which quickly makes them melt and break away from bonds holding them together.
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