What evidence is there (i) that sodium has a low melting point; that (ii) sodium is malleable and ductile?

Answer 1

You really are making us squint...........

What evidence is there that sodium has a low melting point? There is EXPERIMENTAL evidence of same: sodium metal has a melting point of #98# #""^@C#.....

And that sodium is soft? Again, there is experimental evidence evidence of same.

You can cut sodium with a blunt knife. You can compress it with your fingers. Some labs have a sodium press, where a block of sodium is pushed thru a small hole in a metal die so that a long, thin, ribbon of sodium wire emerges into a solvent (the which you want to dry efficiently).

Ask your chemistry teacher to give you a bit of sodium metal, and place the metal in a plastic bag with a bit of oil (under which the sodium is stored). Take a rolling pin (or a bit of metal tube of the the same dimensions), and you will find that the sodium is so malleable that you can roll it out as you would pastry, I kid you not.

And evidence that a gas is produced when you place the sodium in a protic solvent:

#Na(s) + EtOH(aq) rarr EtO^(-)Na^+ +1/2H_2(g)#

Place a small portion of sodium in ethanol (in water it will go bang!). The sodium metal will quite vigorously effervesce. You still have to establish the identity of the liberated gas. How to do that?

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Answer 2

The physical properties of sodium can be verified through experiments and measurements. (i) Sodium has a low melting point, as evidenced by its melting point of 97.79°C (207.82°F). (ii) Sodium is malleable and ductile, as demonstrated by its ability to be stretched into wires (ductility) and flattened into thin sheets (malleability). These properties can be observed through experimental manipulation of sodium samples.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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