Arrange the substances according to their expected melting points. (Lowest to Highest)
C(diamond)
Si3N4
Re
Al
Rb
you can find the melting point of each on the web. Try www.webelements.com or Google.
To arrange the substances according to their expected melting points, we need to consider their chemical properties and bonding.
1. C (diamond): Diamond is composed entirely of carbon atoms, arranged in a strong covalent bonding network. This bonding is highly stable, making diamond the hardest known substance. It has a very high melting point and can withstand extremely high temperatures.
2. Re (Rhenium): Rhenium is a transition metal with metallic bonding. Metals generally have relatively high melting points due to their strong metallic bonding and lattice structures. Rhenium, specifically, has one of the highest melting points among all elements.
3. Si3N4 (Silicon Nitride): Silicon nitride is a compound consisting of silicon and nitrogen atoms bonded together. It has a covalent network structure similar to diamond, which gives it relatively high melting points.
4. Al (Aluminum): Aluminum is a metal but has a lower melting point compared to the substances mentioned earlier. This is because aluminum has weaker metallic bonding compared to rhenium. Aluminum melts at a relatively lower temperature compared to diamond, rhenium, and silicon nitride.
5. Rb (Rubidium): Rubidium is an alkali metal and has the lowest melting point among the substances listed. Alkali metals have relatively low melting points due to the weaker metallic bonding compared to transition metals. Rubidium has one of the lowest melting points among all the elements.
Therefore, the substances arranged according to their expected melting points from lowest to highest are:
Rb < Al < Si3N4 < C(diamond) < Re