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Anna11 [10]
3 years ago
6

Helpppp me plzz....

Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

2.a) warm air is lighter than cold air so thats why it's warmer upstairs than downstairs
3.d) Conduction<span> is the process by which heat energy is transmitted through contact with neighboring molecules</span> 
4.d) the lamp radiates heat throughout the plants 
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Atomic fission requires temperatures of one million degrees or hotter.<br><br> True <br> False
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<u>Answer:</u> The correct answer is false.

<u>Explanation:</u>

Atomic fission reactions are defined as reactions in which nucleus of an atom splits into two or more smaller nuclei. These reactions are carried out in nuclear reactors. The temperature range for the reactors are around 300°C.

Atomic fusion reactions are the reactions in which nucleus of two or more atoms fuse together to form one large nuclei. These reactions require a huge amount of energy to occur. The temperature required by these reactions are about one million kelvins.

Hence, the given statement is False.

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5. What is metallic bonding?<br> 6. Why are metals shiny?
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Answer:

Metallic bonding is found in metals and their alloys. When the atoms give up their valence electrons, they form ions. These ions are held together by the electron cloud surrounding them. Metals are shiny because they have a lot of free (i.e. delocalized) electrons that form a cloud of highly mobile negatively charged electrons on and beneath the smooth metal surface in the ideal case. ... In the absence of any external EM field, the charges in the plasma are uniformly distributed within the metal.

Explanation:

In metallic bonding, the electrons are “surrendered” to a common pool and become shared by all the atoms in the solid metal.

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When we look at an arbitrary point in the sky, away from the sun, we see only the light that was redirected by the atmosphere into our line of sight. Because that occurs much more often for blue light than for red, the sky appears blue. Violet light is actually scattered even a bit more strongly than blue.

Explanation:

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What is enthalpy of atomisation
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