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2020-2021 Online Sth Grade District Interim Assessment #1 Units 1-3
173 CALCULATOR
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20. Limestone is a common form of calcium carbonate. When limestone is
subjected to high heat, it becomes calcium oxide and releases carbon
dioxide gas. This change in limestone at a given temperature is an example
of

your answer would be “dry”

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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