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2 years ago

15

Sodium chloride, an ionic compound, has a high melting point whereas paraffin wax, a molecular compound, melts easily.Explain wh

y.

1 answer:

taurus [48]2 years ago

4 0

Answer:

NaCl is ionic so has strong ionic bonds between ions; paraffin is molecular and has weak intermolecular forces between molecules

Explanation:

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4Fe + 3O2 → 2Fe2O3

Black_prince [1.1K]

n(2Fe2O3)=10g/319.374amu=0.03mol

n(4Fe+3O2)=0.03 mol

m(4Fe+2O2)=Mn=319.374×0.03=9.58=10

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3 years ago

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Which sentence is a scientific statement? A. Long hair looks better than short hair. B. Brick structures insulate better than wo

solong [7]

D) There is a large, apelike creature living in the Himalayas is a scientific statement. The other statements are basically opinions.

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3 years ago

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Arrange each set in order of decreasing atomic size:

MatroZZZ [7]

<u>Answer:</u> The decreasing order of atomic size:

<u>For a:</u> Pb > Sn > Ge

<u>For b:</u> Sr > Sn > Te

<u>For c:</u> Na > F > Ne

<u>For d:</u> Mg > Na > Be

<u>Explanation:</u>

Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

As moving from top to bottom in a group, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases. Thus, increasing the atomic radii of the atom.

As moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

For the given options:

<u>Option a:</u> Ge, Pb, Sn

Germanium (Ge) is present in Group 14 and period 4 of the periodic table.

Lead (Pb) is present in Group 14 and period 6 of the periodic table.

Tin (Sn) is present in Group 14 and period 5 of the periodic table.

So, the decreasing order of atomic size is:

Pb > Sn > Ge

<u>Option b:</u> Sn, Te, Sr

Tin (Sn) is present in Group 14 and period 5 of the periodic table.

Tellurium (Te) is present in Group 16 and period 5 of the periodic table.

Strontium (Sr) is present in Group 2 and period 5 of the periodic table.

So, the decreasing order of atomic size is:

Sr > Sn > Te

<u>Option c:</u> F, Ne, Na

Fluorine (F) is present in Group 17 and period 2 of the periodic table.

Neon (Ne) is present in Group 18 and period 2 of the periodic table.

Sodium (Na) is present in Group 1 and period 3 of the periodic table.

So, the decreasing order of atomic size is:

Na > F > Ne

<u>Option d:</u> Be, Mg, Na

Beryllium (Be) is present in Group 2 and period 2 of the periodic table.

Magnesium (Mg) is present in Group 2 and period 3 of the periodic table.

Sodium (Na) is present in Group 1 and period 3 of the periodic table.

So, the decreasing order of atomic size is:

Mg > Na > Be

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3 years ago

Intrusive igneous rocks _____.

Lady bird [3.3K]

Crystallize below earths surface

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3 years ago

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Place the gases listed below in order from the slowest moving to fastest moving when the gases are at 25 C. O2, N2, F2, Cl2

Olin [163]

The way I solved this is through looking at the gases' weights on the periodic table. The heavier the gas is, the slower it will move (correct me if I'm wrong).

Cl2, F2, O2, N2

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2 years ago

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