Density depends on both the mass and the volume of an object. If you cut a bar of gold in half, you would have two bars with half the mass of the original bar. However, each bar would also have half the volume of the original bar. The density of gold does not change.
Answer:
A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits
A substance that undergoes change during a reaction, usually from coming in contact with another substance
4. NaOH
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