Question

5.Conversion of a liquid to vapour by heating is called
6.Can you obtain wood from sawdust?
7.Changes that lead to the formation of new substances are called
8.Eruption of a volcano is a reversible change.(True/false).​

Answer 1

Answer:

(5)- Vaporization, conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase. If conditions allow the formation of vapour bubbles within a liquid, the vaporization process is called boiling. Direct conversion from solid to vapour is called sublimation

(6)- no,we can't because Sawdust (or wood shavings) is a by-product or waste product of woodworking operations such as sawing, milling, planing, routing, drilling and sanding. ... Sawdust is the main component of particleboard.

(7)- Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reaction

(8)-Rusting of iron is an irreversible change. Eruption of a volcano is a reversible change. Formation of clouds is an irreversible change. Conversion of a solid to liquid by heating is called fusion.

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