Answer:
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b. one week after the full moon phase
Answer;
They cannot be broken down by chemical means
These are pure substances
These combine chemically to form new substances; they are building blocks of matter
Explanation;
An element is a substance that cannot be broken down into simpler substances by chemical means. It is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element.
-Elements are the basic building block of all matter
. Elements are pure substances that cannot be broken down into simpler substance.
Any substance that is formed by the chemical combination of 2 or more elements is called a compound
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Catalyzed and uncatalyzed
