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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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Answer: A

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A soft drink contains 46 g of sugar(sucrose C12H22O11) how many sugar molecules are present?
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8.092752363 ×10 to the power of 22


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If I DECREASE the mass and INCREASE the distance, what happens to the force of gravity?​
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Decreases

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How does doubling the volume of solvent affect the concentration of the solution?
Alex17521 [72]

Answer:

Molarity is halved when the volume of solvent is doubled.

Explanation:

Using the dilution equation (volume 1)(molarity 1)=(volume 2)(molarity 2), we can demonstrate the effects of doubling volume.

Suppose the starting volume is 1 L and the starting molarity is 1 M, and doubling the volume would make the final volume 2 L.

Plugging these numbers into the equation, we can figure out the final molarity.

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3 years ago
Which pair shares the same empirical formula?
ZanzabumX [31]

Answer:- 3. CH_3 and C_2H_6

Explanations:- An empirical formula is the simplest whole number ratio of atoms of each element present in the molecule/compound.

For example, the molecular formula of benzene is C_6H_6 . The ratio of C to H in it is 6:6 that could be simplified to 1:1. So, an empirical formula of benzene is CH.

In the first pair, the ratio of C to H in first molecule is 2:4 that could be simplified to 1:2 and  the empirical formula is CH_2 . In second molecule the ratio of C to H is 6:6 and it could be simplified to 1:1. and the empirical formula is CH. Empirical formulas are different for both the molecules of first pair and so it is not the right choice.

In second pair, C to H ratio in first molecule is 1:2, so the empirical formula is CH_2 . The C to H ratio for second molecule is 1:4, so the empirical formula is CH_4 . Here also, the empirical formulas are not same and hence it is also not the right choice.

In third pair, C to H ratio in first molecule is 1:3, so the empirical formula is CH_3 . In second molecule the C to H ratio is 2:6 and it is simplified to 1:3. So, the empirical formula for this one is also CH_3 . Hence. this is the correct choice.

In fourth pair, first molecule empirical formula is CH. Second molecule has 2:4 that is 1:2 mole ratio of C to H and so its empirical formula is CH_2 . As the empirical formulas are different, it is not the right choice.

So, the only and only correct pair is the third one. 3. CH_3 and C_2H_6

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3 years ago
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