Changes in substance<br> The change of substance can be divided into 2 different ways:<br> 1. Physical change refers to changes in substances related to physical properties without affecting the internal composition and without new substances such as state change, water solubility, etc.<br> 2. Chemistry Change refers to changes in substances associated with chemical properties, which affect the internal composition and have different properties: new substances such as salt acid (HCl), magnesium wire (Mg) and new substances, hydrogen gas (H2).
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