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*Essential Questions *Enduring Understanding <br> <b>Overaching Goal / Enduring Understanding</b><br> *All substances are composed of particles that are always moving and sometimes interact.<br> <br> *The particles (i.e. mass) and the energy are conserved. Opposite charged particles attract while similar charged particles repel.<br> <br> *Since science do measuring, numbers need to be significant and units needs to cancel.<br> <br>
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