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3 years ago

Which of the following extends the furthest away from us?

Chemistry

2 answers:

slamgirl [31]3 years ago

6 0

Answer:

A. Milky Way Galaxy

Explanation:

the milky way galaxy extends for thousands of light years

vlada-n [284]3 years ago

5 0

Answer:

Explanation:

The galaxy is the biggest thing and we're inside of it and the solar system is inside of it and inside the solar system is Jupiter and Tampa is on earth

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1) For the equation in the picture, write down the molecular formula for each of the following species in the reaction:

konstantin123 [22]

Answer:

yo no ablo inglés amigos jjjj

7 0

3 years ago

According to VSEPR theory, what is the shape of a molecule of CS2? A bent B trigonal-planar C tetrahedral D linear

goblinko [34]

Answer:

D linear

Explanation:

Valence electrons of carbon = 4

Valence electrons of sulfur = 6

The total number of the valence electrons = 4 + 2(6) = 16

The Lewis structure is drawn in such a way that the octet of each atom in the molecule is complete. So,

The Lewis structure is:

$: \ddot S :: C:: \ddot S :$

There is no lone pair involved, so, It is of type AB₂.

According to the theory, the atoms will form a geometry in such a way that there is minimum repulsion and maximum stability.

So, it is of linear shape.

5 0

4 years ago

Which of the following is the major advantage of using geothermal energy instead of using coal energy? Choice:

maxonik [38]

Answer:

C. Releases less carbon dioxide

Explanation:

since geothermal steams are directly from earths surface they do not have carbon dioxide therefore they can be used to rotate turbines ultimately generating electricity.

5 0

3 years ago

Because of the law of motion there are no limits on how fast the roller coaster can go true or false.

Lelechka [254]

Answer False

Explanation: Friction makes it stop at some point. For it to have an unlimited speed goes against beset is first law that states an object in motion with stay in motion unless acted upon by an external force, your force will be the friction of the wheels on the roller coaster

7 0

3 years ago

A solution is prepared by dissolving 0.26 mol of hydrazoic acid and 0.26 mol of sodium azide in water sufficient to yield 1.00 L

Pavel [41]

Answer:

The pH does not decrease drastically because the HCl reacts with the sodium azide (NaN₃) present in the buffer solution.

Explanation:

The buffer solution is formed by 0.26 moles of the weak acid, hydrazoic acid (HN₃), and by 0.26 moles of sodium azide (NaN₃). The equilibrium reaction of this buffer solution is the following:

HN₃(aq) + H₂O(l) ⇄ N₃⁻(aq) + H₃O⁺(aq)

The pH of this solution is:

$pH = pka + log(\frac{[N_{3}^{-}]}{[HN_{3}]}) = -log(2.5 \cdot 10^{-5}) + log(\frac{0.26 mol/1 L}{0.26 mol/1 L}) = 4.60$

When 0.05 moles of HCl is added to the buffer solution, the following reaction takes place:

H₃O⁺(aq) + N₃⁻(aq) ⇄ HN₃(aq) + H₂O(l)

The number of moles of NaN₃ after the reaction with HCl is:

$\eta_{NaN_{3}} = \eta_{i} - \eta_{HCl} = 0.26 moles - 0.05 moles = 0.21 moles$

Now, the number of moles of HN₃ is:

$\eta_{HN_{3}} = \eta_{i} + \eta_{HCl} = 0.26 moles + 0.05 moles = 0.31 moles$

Then, the pH of the buffer solution after the addition of HCl is:

$pH = pka + log(\frac{[N_{3}^{-}]}{[HN_{3}]}) = -log(2.5 \cdot 10^{-5}) + log(\frac{0.21 mol/V_{T}}{0.31 mol/V_{T}}) = 4.43$

The pH of the buffer solution does not decrease drastically, it is 4.60 before the addition of HCl and 4.43 after the addition of HCl.

Therefore, the pH does not decrease drastically because the HCl reacts with the sodium azide (NaN₃) present in the buffer solution.

I hope it helps you!

6 0

3 years ago