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egoroff_w [7]
3 years ago
14

Which method preserves an image of a leaf?.

Chemistry
2 answers:
Masteriza [31]3 years ago
6 0

Answer:

As the leaf decomposes, the carbon of the leaf is left in the rock.

Explanation:

A fossil is any rest of the organism or its activity that has a minimum age of 10 thousand years. That is, fossils are the remains or marks of extinct animals, which after death their bodies or marks of their activity have been preserved in some way.

After the death of animals and plants, their components are recycled to be part of other beings, thus completing a cycle of life. For an organism to fossilize, special processes must occur that allow its preservation. When this type of situation occurs, then fossilization occurs.

Then, fossilization is the set of processes that make an organism, some of its parts or traces of its activity, become part of the fossil record.

When vegetables are printed in the sediment leaving their mark, as in this case where an image of a leaf is preserved, it is called "Impressions and Compressions." Then the tissue of the leaf degrades, leaving a trace of where the leaf once was. Finally, <u><em>as the leaf decomposes, the carbon of the leaf is left in the rock.</em></u>

Sav [38]3 years ago
5 0

Answer:

Tree sap flows over the leaf and preserves it.

Explanation:

Amber would preserve the image.

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Explanation:

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3 years ago
What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

According to the given conditions, the equation will become as follow

pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

pH=6.86 + log(\frac{0.058}{0.042})

pH=7.00

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Answer:

Solute - The solute is the substance that is being dissolved by another substance. In the example above, the salt is the solute. Solvent - The solvent is the substance that dissolves the other substance. In the example above, the water is the solvent.

Explanation:

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