Answer:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
I hope this helps you understand! <3
2.91 is the amount of atoms
It's because they add to its hardness . Calcium is naturally dissolved in water
Answer:
breathing
Explanation:
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