A student, Earl N. Meyer, is given a 3.000 g sample of a mixture of salt and sand. Earl added water to the mixture, filtered out the sand, evaporated off the water from the salt and weighed his final products. He ended up with 1.300
grams of salt and 2.300 grams of sand.
A. What was the % concentration of salt in Earl's mixture? Show your calculations, Report to correct precision.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

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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