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yKpoI14uk [10]
3 years ago
14

How is the Sun related to day and night and the change of seasons?

Chemistry
2 answers:
atroni [7]3 years ago
4 0

Explanation:

As the Earth moves around the sun during a year, the northern half of the Earth is tilted towards the sun in the summer, making daytime longer than night. In winter, this reverses; the earth tilts away from the sun and nighttime becomes longer

LekaFEV [45]3 years ago
3 0

Answer:

As the Earth moves around the sun during a year, the northern half of the Earth is tilted towards the sun in the summer, making daytime longer than night. In winter, this reverses; the earth tilts away from the sun and nighttime becomes longer.

Explanation:

hope this helps have a good rest of your day :) ❤

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Why must a new flu vaccine be manufactured annually?
mafiozo [28]

Answer:

D or A

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It's because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them.

7 0
2 years ago
What is the number of moles in 15.0 g AsH3?
pentagon [3]

We are given with the mass of Arsine (AsH_{3}

The mass of arsine is 15g

there is a relation between moles, mass and molar mass of any compound which is

moles=\frac{mass}{molarmass}

The molar mass of Arsine = atomic mass of As + 3X atomic mass of H

the molar mass of Arsine = 74.92 + 3X 1 = 77.92 g/mol

Let us calculate the moles as

moles=\frac{15}{77.92}=0.192mol


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