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atroni [7]
2 years ago
11

Why do the stars appear to move across the night sky?

Chemistry
2 answers:
DaniilM [7]2 years ago
5 0

Answer:

The motion is due to the Earth's rotation.

Explanation:

dmitriy555 [2]2 years ago
5 0

Answer:

The stars arent moving, we are.

Explanation:

The rotational movement of the Earth is what makes the star appear as if moving from the east to the west in the sky, as the planet rotates with an axis pointed towards the direction of our/the North Star.

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Consider the halogenation of ethene, where x is a generic halogen: h2c=ch2(g)+x2(g)→h2xc−ch2x(g) you may want to reference (page
KengaRu [80]
Consider the halogenation of ethene is as follows:
CH₂=CH₂(g) + X₂(g) → H₂CX-CH₂X(g)
We can expect that this reaction occurring by breaking of a C=C bond and forming of two C-X bonds.
When bond break it is endothermic and when bond is formed it is exothermic.
So we can calculate the overall enthalpy change as a sum of the required bonds in the products:
Part a) 
C=C break = +611 kJ
2 C-F formed = (2 * - 552) = -1104 kJ
Δ H = + 611 - 1104 = - 493 kJ

2C-Cl formed = (2 * -339) = - 678 kJ
ΔH = + 611 - 678 = -67 kJ

2 C-Br formed = (2 * -280) = -560 kJ
ΔH = + 611 - 560 = + 51 kJ

2 C-I Formed = (2 * -209) = -418 kJ
ΔH = + 611 - 418 = + 193 kJ

Part b)
As we can see that the highest exothermic bond formed is C-F bond so from bond energies we can found that addition of fluoride is the most exothermic reaction
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3 years ago
Choose a sport or sporting play. Describe the types of energy involved in playing the sport. State whether playing the sport is
mrs_skeptik [129]

Answer:

Doing a bungee jumping

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3 years ago
What does this image represent?
umka2103 [35]
I don’t really have a clear answer for you but this might help

7 0
3 years ago
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How do dominant and recessive traits impact genotype and phenotype?
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The phenotype depends on the dominant allele. Only people with aa genotype will express recessive traits. Hope this helped!
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Which determines the frequency of a sound wave? A the intensity of the sound waves B the rate at which the sound source is vibra
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