Chemical Changes and Reactions

Chemical changes occur when a substance combines with another to form a new substance.

Chemical reactions are processes where substances combine or decompose to form new substances.

In general, chemical reactions are not reversible except by further chemical reactions.

<p>Endothermic reactions require heat to enable the reaction to occur.</p> Signup and view all the answers

<p>Exothermic reactions produce heat as a byproduct.</p> Signup and view all the answers

<p>Endothermic reactions</p> Signup and view all the answers

<p>They are rearranged</p> Signup and view all the answers

<p>The atoms are rearranged</p> Signup and view all the answers

<p>Chemical synthesis</p> Signup and view all the answers

<p>Burning wood</p> Signup and view all the answers