M2S6 – Covalent Structures and Bonding

Covalent Structures and Bonding

1 / 10

Which of these sets of properties is that of a substance which is molecular?

Electrical conductivity when solid: good; Electrical conductivity when liquid: good; Melting point: 63 oC

Electrical conductivity when solid: good; Electrical conductivity when liquid: good; Melting point: 650 oC

Electrical conductivity when solid: poor; Electrical conductivity when liquid: poor; Melting point: 8.4 oC

Electrical conductivity when solid: poor; Electrical conductivity when liquid: good; Melting point: 712 oC

2 / 10

An element X has the electron configuration 1s²2s²2p². Element Y has the electron configuration 1s²2s²2p⁵. What is the likely formula of the compound of X and Y?

X2Y5

XY4

XY3

XY2

3 / 10

How many shared pairs of electrons are there in an ethene molecule, C₂H₄?

3

4

5

6

4 / 10

In the formula of water, H-O-H, the lines represent:

(i) shared pairs of electrons

(ii) dative bonds

(iii) covalent bonds

(iv) hydrogen bonds

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Typically the molecular compounds of carbon with hydrogen:

(i) are insoluble in water

(ii) form solutions which do not conduct electricity

(iii) are soluble in liquid hydrocarbons

(iv) are denser than water

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Which of these elements consist of a giant structure of atoms joined by covalent bonding?

(i) graphite

(ii) sulfur

(iii) diamond

(iv) iodine

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

An ammonia molecule, NH₃, can react to form an ammonium ion, NH₄⁺. When this happens:

(i) the ammonia molecule forms a bond with a proton

(ii) the ion formed has a tetrahedral shape

(iii) a dative covalent bond forms

(iv) the H-N-H bond angle is 90^o

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

Which of these compounds consist of molecules which are linear?

(i) water

(ii) beryllium chloride

(iii) sulfur dioxide

(iv) carbon dioxide

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

9 / 10

Which of these molecules are overall polar?

(i) CH₃Cl

(ii) CH₂Cl₂

(iii) CHCl₃

(iv) CCl₄

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

10 / 10

A molecule of sulfur hexafluoride, SF₆ is:

planar

tetrahedral

pyramidal

octahedral

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