3 years ago

Which one of these is NOT a sign of chemical change? *

Chemistry

1 answer:

Gekata [30.6K]3 years ago

3 0

I think it’s light
Have fun :)

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If stomach acid has a ph of 1.3, what is the pOH

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3 years ago

The radius of a vanadium atom is 130 pm. How many vanadium atoms would have to be laid side by side to span a distance of 1.30 m

monitta

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

= 130 x $10^{-12}$ m

The diameter of a vanadium atom = 2 x radius

= 2 x 130 x $10^{-12}$

= 260 x $10^{-12}$ m

Given a distance of 1.30 mm = 1.30 x $10^{-3}$ m,

The number of vanadium atoms required to span the distance = $\frac{1.3*10^{-3} }{260*10^{-12} }$

= 5000000

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Answer:

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Explanation:

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What i am saying is that the number of moles of water obtained in the calculation will be artificially low.

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