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denpristay [2]
2 years ago
5

Describe what Darwin observed during his voyage on the HMS Beagle

Chemistry
2 answers:
melisa1 [442]2 years ago
6 0
I think he saw birds of striking different form and structure to those of Europe and went further to establish that it was due to evolution. 
labwork [276]2 years ago
6 0
I think he saw birds of striking different form and structure to those of Europe and went further to establish that it was due to evolution. 
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Helium does not usually react with other substances. Does this mean that helium has no chemical properties? Explain.
Sedaia [141]
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3 0
3 years ago
Where do you find a valence electron?
slamgirl [31]

Answer:

In chemistry, valence electrons are the electrons that are located in the outermost electron shell of an element.

Explanation:

6 0
3 years ago
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How does cellular respiration help humans
babunello [35]
Well, Cellular Respiration does a lot for your body in many ways! It breaks down the sugars, fats, and proteins and gives your body the energy (ATP) it needs from that. 
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2 years ago
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Describe how sodium conducts thermal energy. [3 Marks]
Vera_Pavlovna [14]

In metals, some of the electrons (often one per atom) are not stuck to individual atoms but flow freely among the atoms. Of course, that's why metals are such good conductors of electricity. Now if one end of a bar is hot, and the other is cold, the electrons on the hot end have a little more thermal energy- random jiggling- than the ones on the cold end. So as the electrons wander around, they carry energy from the hot end to the cold end, which is another way of saying they conduct heat.

Here, sodium is a metal which possesses an extra (valence) electron carries the heat around its body as it is a free electron, which enables sodium to conduct thermal energy.

Hope this help :)

3 0
2 years ago
How many grams of N2 are required to react with 4.2 moles of Mg in the following process?
8090 [49]

Answer:

x = 0.45*28/3 = 4.2 g

Explanation:

showing work

N2 = 28 g/mole

3Mg + N2 → Mg3N2

3moles .. 28 g

0.45 moles .. x

x = 0.45*28/3 = 4.2 g (answer)

6 0
2 years ago
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