<h1 id="matter">Matter<a aria-hidden="true" class="anchor-heading icon-link" href="#matter"></a></h1>
<p>Matter is not created or destroyed; it is rearranged and recycled through chemical and physical changes. This is known as the Law of Conservation of Mass. The particle model can illustrate this principle.</p>
<p>Physical changes only change the appearance of something but do not form a new substance. The law of conservation of mass applies as well.</p>
<p>Physical changes, where matter doesn't transform into a new substance, can be identified by five key signs. These indicators may appear individually or in combination.</p>
<p>When a substance changes state such as a liquid evaporating into a gas occurs,  a physical change has occurred.  </p>
<p>Substance changes are physical changes because no new substance has been formed.</p>
<p>objects can change size and still be a physical change</p>
<p>The colour is another easy way to observe that matter has changed. Colour change can be a physical change when a mixture is formed from two different coloured substances mixing together. </p>
<p>Most physical changes are reversible, but some aren't as easy.</p>
<h1 id="elements">Elements<a aria-hidden="true" class="anchor-heading icon-link" href="#elements"></a></h1>
<p>is a type of atom
a single ator or a molecule 2 atoms bonded</p>

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