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Changes in Matter Physical Change A substance that undergoes a physical change is still the same substance after the change. ATOMS STAY THE SAME Changing states/phases – water to ice – Solid butter to liquid butter Changes in shape or form – – – – bending crushing breaking chopping Chemical Change/Reaction A change in matter that produces one or more new substances. ATOMS GAIN, LOOSE OR SHARE ELECTRONS Evidence of a chemical change: – – – – – – Unexpected color change Change in odor Gas bubbles/fizzing appears Electricity is generated Light is produced Fire/smoke is produced