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Savatey [412]
3 years ago
9

The Tapeats Sandstone and Bright Angel Shale contain fossils of trilobites. Trilobites were marine organisms similar to modern-d

ay horseshoe crabs. No other layers contain trilobite fossils. Which conclusion best explains these observations?
A. The area became dry land after the Bright Angel Shale period.
B. An asteroid hit the earth after the Bright Angel Shale period.
C. The trilobites became extinct after the Bright Angel Shale period.
D. The trilobites migrated away from the area after the Bright Angel Shale period.
Chemistry
1 answer:
Anna007 [38]3 years ago
3 0
<span>D. The trilobites migrated away from the area after the Bright Angel Shale period.</span>
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How many grams of magnesium nitride is required to produce 25.00 g of magnesium hydroxide?
Lesechka [4]

Answer:

25 grams of Mg(OH)2 will be produced by 14.424 gram of Mg3N2

Explanation:

The balanced equation is

Mg3N2 + 6H2O -> 3Mg(OH)2 + 2NH3

Molecular weight of magnesium nitride = 100.9494 g/mol

Molecular weight of magnesium hydroxide = 58.3197 g/mol

one mole of Mg3N2 produces three moles of 3Mg(OH)2

100.9494 g/mol of  Mg3N2 produces 3* 58.3197 g/mol of Mg(OH)2

1 gram of Mg3N2 produces

\frac{3* 58.3197}{100.9494 } \\1.733grams of Mg(OH)2

Or 1.733 grams of Mg(OH)2 will be produced by 1 gram of Mg3N2

25 grams of Mg(OH)2 will be produced by 14.424 gram of Mg3N2

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2 years ago
What are the main properties of liquids (in contrast to gases and solids)? check all that apply. check all that apply. liquids h
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B is true because liquids are still more compact than gases, although they are loose, they aren't completely free. They also don't have a definite volume, making them assume the shape of their container. As for compression, liquids are harder to compress compared to gases.
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3 years ago
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Explanation:

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