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3 years ago

Which bond will each pair of elements form?

1 answer:

7 0

Explanation: Sodium is a metal with a low electronegativity it will form an ionic bond with a non metal with a high electronegativity.

Both Florine and Sulfur are non metals with high electronegativity.

Neon is a noble gas family VIII A and normally doesn't form any bonds at all.

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Which atom loses 2 electrons while forming an ion?

BabaBlast [244]

Answer:

it would be a cation ... i believe

Explanation:

To become a cation, a positively charged ion, an atom would have to lose at least two electrons

7 0

3 years ago

This is a measure of mass per unit volume.

il63 [147K]

Answer:

Density

Explanation:

Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.

8 0

3 years ago

Manganese metal can be obtained by the reaction of manganese dioxide with aluminium. 4Al(s) + 3MnOz(s) → 2 Al2O3(s) + 3 Mn(s) Ca

Snezhnost [94]

Answer : The enthalpy change of reaction is -1800 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

$4Al(s)+3MnO_2(s)\rightarrow 2Al_2O_3(s)+3Mn(s)$ $\Delta H=?$

The intermediate balanced chemical reaction will be,

(1) $2Al(s)+\frac{3}{2}O_2(g)\rightarrow Al_2O_3(s)$ $\Delta H_1=-1680kJ/mole$

(2) $Mn(s)+O_2(g)\rightarrow MnO_2(s)$ $\Delta H_2=-520kJ/mole$

First we will multiply reaction 1 by 2 and reverse reaction of reaction 2 by 3 then adding both the equation, we get :

The expression for final enthalpy is,

$\Delta H=[n\times \Delta H_1]+[n\times (-\Delta H_2)]$

where,

n = number of moles

$\Delta H=[2mole\times (-1680kJ/mole)]+[3\times -(-520kJ/mole)]$

$\Delta H=-1800kJ$

Therefore, the enthalpy change of reaction is -1800 kJ

8 0

3 years ago

(01.01 MC)

marysya [2.9K]

I think the answer is D (number 4)

4 0

3 years ago

water’s molar mass is 18.01 g/mol. The molar mass of glycerol is 92.09 g/mol. At 25 celsius, glycerol is more viscous than water

Gemiola [76]

Answer is: glycerol because it is more viscous and has a larger molar mass.

Viscosity depends on intermolecular interactions.

The predominant intermolecular force in water and glycerol is hydrogen bonding.

Hydrogen bond is an electrostatic attraction between two polar groups in which one group has hydrogen atom (H) and another group has highly electronegative atom such as nitrogen (like in this molecule), oxygen (O) or fluorine (F).

4 0

4 years ago