Bonding

The physical properties of four solid substances, $W$ , $X$ , $Y$ , and $Z$ , are shown in the table below:

Substance	Melting point / $K\text{K}$	Electrical conductivity as a solid	Electrical conductivity as a liquid
$W$	387	Poor	Poor
$X$	1074	Poor	Good
$Y$	1811	Good	Good
$Z$	1986	Poor	Poor

In which substance are covalent bonds broken when the solid melts?

$W$

$X$

$Y$

$Z$

The physical properties of four solid substances, $W$ , $X$ , $Y$ , and $Z$ , are shown in the table below:

Substance	Melting point / $K\text{K}$	Electrical conductivity as a solid	Electrical conductivity as a liquid
$W$	387	Poor	Poor
$X$	1074	Poor	Good
$Y$	1811	Good	Good
$Z$	1986	Poor	Poor

In which substance are covalent bonds broken when the solid melts?

$W$

$X$

$Y$

$Z$

Bonding Questions