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GaryK [48]
3 years ago
6

What elements make up most of the mantle?

Chemistry
1 answer:
amid [387]3 years ago
8 0
44.8% oxygen, 21.5% silicon, and 22.8% magnesium. There's also iron, aluminum, calcium, sodium, and potassium. These elements are all bound together in the form of silicate rocks, all of which take the form of oxides.
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Substance in which two or more elements are combined in a fixed proportion
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Answer: compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper Cu

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water H_2O

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air

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Which family contains elements with a full octet of valence electrons?
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D. the noble gasses !!!!
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4.80 x 10^25 formula units pf calcium iodide (Cal2) will have what mass?
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Answer:

mass CaI2 = 23.424 Kg

Explanation:

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∴ mol CaI2 = (4.80 E25 units )×(mol/6.022 E23 units) = 79.708  mol CaI2

⇒ mass CaI2 = (79.708 mol CaI2)×(293.878 g/mol) = 23424.43 g

⇒ mass CaI2 = 23.424 Kg

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Why are hydrogen bonds so essential to the structure of dna?
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