plz justify both statements in short answer
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Combustion reactions are almost always exothermic (i.e., they give off heat). For example when wood burns, it must do so in the presence of O2 and a lot of heat is produced .
When organic molecules combust the reaction products are carbon dioxide and water (as well as heat).
Solids have definite shape and definite volume because the molecules in solid are closely packed and in fixed positions. The molecules can vibrate but do not move around which keeps the shape and volume definite.
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2. solids don't change shape because the molecules are attached closely and have no intermolecular space
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