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It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, butcarbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.
I would say d.
Explanation:
a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).
Answer:
The volume of reactant measured at STP left over is 409.9 L
Explanation:
A and b are both safety protocols, but C says to follow all saftey protocols. your answer is C