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3 years ago

Determine whether the following pairs of elements can form ionic compounds.

Chemistry

1 answer:

hoa [83]3 years ago

4 0

Answer:

• Sodium and oxygen

• Manganese and chlorine

• Oxygen and calcium

• Chlorine and sodium

Explanation:

Ionic compounds are formed when a very electronegative element (that is, that has high electronic affinity), comes into contact with a low electronegative or very electropositive element (it is said to have low ionization potential). Thus, an electron transfer takes place, from the electropositive element, remaining with less electrons than its original form and forming a cation, towards the most electronegative, which is left with more electrons than the initial ones, and forms an anion. The difference in charges between the elements causes the union to occur due to the opposite electrostatic forces between them.

This type of bonding occurs between metals with nonmetals, because among these there is a large difference in electronegativity, and the transfer of electrons occurs from metals, which form cations, to nonmetals, which remain as anions.

Therefore, the pairs of elements that can form this type of compound are the pairs that contain a metal and a nonmetal. They are:

• Sodium and oxygen

• Manganese and chlorine

• Oxygen and calcium

• Chlorine and sodium

The other pairs described in the statement (Nitrogen and iodine - Potassium and calcium), are formed by elements of the same family (two nonmetals and two metals, respectively), so there is no significant electronegativity difference so that ionic bonding occurs.

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If 42.8 mL of 0.204 M HCl solution is needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solut

Aneli [31]

Hey There!

At neutralisation moles of H⁺ from HCl = moles of OH⁻ from Ca(OH)2 so :

0.204 * 42.8 / 1000 => 0.0087312 moles

Moles of Ca(OH)2 :

2 HCl + Ca(OH)2 = CaCl2 + 2 H2O

0.0087312 / 2 => 0.0043656 moles ( since each Ca(OH)2 ives 2 OH⁻ ions )

Therefore:

Molar mass Ca(OH)2 = 74.1 g/mol

mass = moles of Ca(OH)2 * molar mass

mass = 0.0043656 * 74.1

mass = 0.32 g of Ca(OH)2

Hope that helps!

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Instructions:

never [62]

Answer:

See explanation

Explanation:

A. Constitutional or structural isomers have the same molecular formula but different structural formulas.

B. Conformational isomers are compounds having the same atom to atom connectivity but differ by rotation about one or more single bonds.

C. Stereo isomers are compounds having the same molecular mass and atom to atom connectivity but different arrangement of atoms and groups in space.

I. Enantiomers are stereo isomers (optical isomers particularly) that are non-superimposable mirror images of each other.

II. Diasteromers are optical isomers that are not mirror images of each other.

Both diasteromers and enantiomers are types of optical isomers which in turn is one of the types of stereo isomers.

Stereo isomers differ from conformational isomers in that the arrangement of atoms in stereo isomers is permanent while conformational isomers results from free rotations in molecules about single bonds.

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3 years ago