Which of the following are true concerning balanced chemical equations? There may be more then one true statement. A. The number of molecules is conserved.
B. The coefficients tell you how much of each substance you have.
C. Atoms are nether created more destroyed.
D. The sum of the coefficients indicates the mass ratios of the substance used.
E. The sum of the coefficients on the reactant side equal the same of the coefficients on the product side.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

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.

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