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3 years ago

Why does sodium chloride have a high melting point?

Chemistry

2 answers:

frez [133]3 years ago

8 0

Because Nacl is an ionic compound and ionic compound have strong force of attraction between their atoms.

Degger [83]3 years ago

7 0

Sodium chloride has a high melting point because of the strong electrostatic attraction between it's positive and negative ions; this requires more heat energy to overcome. All ionic compounds have a high melting point for this reason.

Hope this helps!!

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Which of the following does NOT show the law of conservation of mass?

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I think the correct answer from the choices listed above is option B. 24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO does not show the law of conservation of mass. Volumes cannot be added because there are volume effects when you add different substances. So, the reactants is not equal to the product.

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4 years ago

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TiliK225 [7]

Answer: false

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3 years ago

Which of the following has the smallest radius? A. O^2- B. F^- C. Li^- D. Be^2+

nordsb [41]

Answer : The correct option is, (D) $Be^{2+}$

Explanation :

Effective nuclear charge : It is defined as the attraction of the protons present in the nucleus of an atom to the outermost electrons.

For ions, the effective nuclear charge changes than the neutral atom.

There are two types of ions:

Cations: They are formed when an atom looses its valence electrons. They are positive ions.

Anions: They are formed when an atom gain electrons in its outermost shell. They are negative ions.

For positive ions, the removal of electron increases the nuclear charge for an outermost electron because the outermost electrons are more strongly attracted by the nucleus. Thus, the effective nuclear charge increases for cations.

From this we conclude that, the size of the cation is smaller than their neutral atom because it has less number of electrons while its nuclear charge remains the same. So, the nucleus attracts the electron more towards itself and leads to the decrease in size.

For negative ions, the addition of electron decreases the nuclear charge for an outermost electron because the outermost electrons are less strongly attracted by the nucleus. Thus, the effective nuclear charge decreases for anions.

From this we conclude that, the size of the anion is greater than their neutral atom because it has more number of electrons while its nuclear charge remains the same. So, the nucleus attracts the electron less towards itself and leads to the increase in size.

Thus, the increasing order of radius of ions will be:

$Be^{2+}$

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4 years ago

The value of the equilibrium constant K depends on: I. the initial concentrations of the reactants. II. the initial concentratio

Elden [556K]

Answer:

None of these

Explanation:

For a reaction;

aA + bB ------>cC + dD

The equilibrium constant K is given as;

K = [C]^c [D]^d/[A]^a [B]^b

The equilibrium constant neither depends on the concentrations of the reactants nor on that of the products.

Let us recall that at equilibrium, the concentrations of reactants and products remain largely constant. This implies that, concentration of species do not appreciably change at equilibrium because the rates of forward and reverse reactions are equal.

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