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Zepler [3.9K]
3 years ago
10

Some species are no longer living but we know they existed one time. we know this because....

Chemistry
1 answer:
Dahasolnce [82]3 years ago
6 0
We know this because of the discovery of fossils and bones. We can find out roughly when they existed because of carbon dating.
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How many grams of Pb are there in a sample of Pb that contains 1.15×1024 atoms? grams
Ipatiy [6.2K]
<h3>Solution:</h3>

\text{mass of Pb = 1.15 × 10²⁴ Pb atoms} × \frac{\text{1 mol Pb}}{\text{6.022 × 10²³ Pb atoms}} × \frac{\text{207.2 g Pb}}{\text{1 mol Pb}}

\boxed{\text{mass of Pb = 396 g}}

5 0
3 years ago
What will most likely happen when these molecules get closer? The molecules will repel each other because of a dipole-dipole int
Lostsunrise [7]

The question is incomplete. The complete question is

In the molecule on the left, areas that have a partial negative charge are pink and areas that have a partial positive charge are blue. The molecule on the right is nonpolar.

What will most likely happen when these molecules get closer?

The molecules will repel each other because of a dipole-dipole interaction. The molecules will attract each other because of a dipole-dipole interaction. An induced dipole will be produced in the molecule on the right. An induced dipole will be produced in the molecule on the left.

Answer:

An induced dipole will be produced in the molecule on the right.

Explanation:

The molecule on the left already possesses a dipole. A dipole means the presence of a negative end and a positive end in a molecule.

Hence when the other molecule approaches, the polarized molecule induces a dipole on it. This second kind of dipole is known as 'induced dipole' hence the answer.

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4 years ago
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im just seeing something

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Explanation:some data are missing are they need experiment??

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