How is the star moving with respect to earth?

1 answer:

3 0

Stars appear to be rising and setting, as well as the planets, Moon and the Sun. And with more precise instruments, we can see some stars appearing to move back and forth relative to other ones. ... Stars that are close to the Earth's axis of rotation—what we call the north and the south pole—rotate around the poles.

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Isopropyl alcohol is mixed with water to produce a 32.0 % (v/v) alcohol solution. How many milliliters of each component are pre

Sonja [21]

Answer: The volume of isopropyl alcohol present is 254.4 mL and the volume of water present is 540.6 mL

Explanation:

We are given:

32.0 % (v/v) alcohol solution

This means that 32 mL of isopropyl alcohol is present in 100 mL of solution

Volume of water = 100 - 32 = 68 mL

Volume of solution given = 795 mL

Applying unitary method:

In 100 mL of solution, the volume of isopropyl alcohol present is 32 mL

So, in 795 mL of solution, the volume of isopropyl alcohol present will be = $\frac{32}{100}\times 795=254.4mL$

Volume of water in given amount of solution = 795 - 254.4 = 540.6 mL

Hence, the volume of isopropyl alcohol present is 254.4 mL and the volume of water present is 540.6 mL

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4 years ago

For a solution, [H+] = 3 x 10-11M. What is the pH?

BARSIC [14]

Answer:

pH≈10.5

Explanation:

-log(3 x 10-11)≈10.5

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3 years ago

Where are the electrons located on a periodic table?

crimeas [40]

Electrons are the same as the atomic mass.

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At STP, what physical property of aluminum always remains the same from sample to sample?

KIM [24]

At STP, the physical property of aluminum that always remains the same from sample to sample is density. The standard temperature is actually 273 degree kelvin and the standard pressure is 1 atmospheric pressure. I hope that this is the answer that has actually come to your desired help.

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Which notations represent atoms that have the same number of protons but a different number of neutrons?

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Atoms of the same element, containing the same number of protons, but different numbers of neutrons, are known as isotopes. Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2).

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