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ira [324]
3 years ago
5

Amanda's younger brother tells her that he saw a comet with a long and bright tail move rapidly across the sky. Amanda tells him

that it was not a comet. Which statement explains why Amanda is correct?
A.Comets do not have tails.
B.Comets are not ever visible from Earth.
C.Comets are not a part of our Solar System.
D.Comets don't move rapidly across the sky.
Chemistry
2 answers:
spayn [35]3 years ago
4 0

it would be B.Comets are not ever visible from Earth.

Comets travel very fast, loop around the Sun, and have long tails. A comet is a chunk of material left over from the formation of the solar system. ... Because the comets are much smaller and lighter than planets, they are easily pulled this way and that by the gravity of the planets (or, in some cases, even by stars).

Yes. All of the comets in the Kuiper Belt and Oort Cloud are part of the solar system. They orbit our Sun, and obey the same laws of motion as the planets and their moons. Comets also started with the same materials that planets like Earth were made from.

Halley's Comet, for example, is usually very bright when it passes through the inner Solar System every seventy-six years, but during its 1986 apparition, its closest approach to Earth was almost the most distant possible. The comet became visible to the naked eye, but was unspectacular.

As a comet approaches the Sun, it starts to heat up. The ice transforms directly from a solid to a vapor, releasing the dust particles embedded inside. Sunlight and the stream of charged particles flowing from the Sun – the solar wind – sweeps the evaporated material and dust back in a long tail.

kolezko [41]3 years ago
3 0

D. Comets don't move rapidly across the sky.

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Statement 2 is correct.
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3 years ago
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The size (radius) of an oxygen molecule is about 2.0 ×10−10m. Make a rough estimate of the pressure at which the finite volume o
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Answer:

Explanation:

We can calculate the volume  of the oxygen molecule as the radius of oxygen molecule is given as 2×10⁻¹⁰m.

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volume=33.40×10⁻³⁰m³

Volume of oxygen molecule=33.40×10⁻³⁰m³

we know the ideal gas equation as:

PV=nRT

k=R/Na

R=k×Na

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T is temperature of gas

N is numbetr of molecules

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k is boltzmann constant =1.38×10⁻²³J/K

R is real gas constant

So to calculate pressure using the  formula;

PV=NkT

P=NkT/V

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8 0
3 years ago
How many grams of phosphorus are in a sample of Ca3(PO4)2 that contains 50.0 g of calcium? Answer: ________ grams of phosphorus.
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<u>Answer:</u> The mass of phosphorus that is present for given amount of calcium is 28.53 g.

<u>Explanation:</u>

We are given:

Mass of calcium = 50 grams

The chemical formula of calcium phosphate is Ca_3(PO_4)_2

Molar mass of calcium = 40 g/mol

Molar mass of phosphorus = 31 g/mol

In 1 mole of calcium phosphate, 120 grams of calcium is combining with 62 grams of phosphorus.

So, 50 grams of calcium will combine with = \frac{62}{120}\times 50=28.53g of phosphorus.

Hence, the mass of phosphorus that is present for given amount of calcium is 28.53 g.

6 0
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