ICSE BoardEnglish MediumSTD 8CHEMISTRYChemical Reactions2 Marks
Question
State why a direct combination reaction is called a $–$ ‘synthesis reaction’.
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Answer
When two or more substances $[$element with element or element with compound or compound with another compound$]$ combine to form a new compound with new properties. Hence direct combination is called ‘synthesis reaction’.
Example :
Hydrogen $($a gas$) +$ Oxygen $($a gas$)$ combines to form water $($liquid$)$.
$\ce{2H_2}+ \ce{O_2 \rightarrow 2H_2O}$
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