Top answers

Why does silicon dioxide have a higher melting point than sulphur?

Silicon dioxide (SiO2) has a macromolecular structure. This means that it forms thousands of covalent bonds between its silicon and oxygen subunits. Sulphur trioxide (SO3), meanwhile, has a simple covalent s...
JL
Answered by Jacob L. • Chemistry tutor
32931 Views

Describe and explain one anomalous property of water.

One anomalous property of water is that when in its solid phase (ice) it is less dense than when it's in its liquid phase. This arises because of the hydrogen bonding network that exists between water molecu...
DE
Answered by Dan E. • Chemistry tutor
15212 Views

Explain why the atomic radii of the elements decrease across Period 3 from sodium to chlorine

As you go across the period from sodium to chlorine, the number of protons in the nucleus increase.As protons are positively charged, they attract the outer electrons; as the number of protons increase, the ...
EC
Answered by Eve C. • Chemistry tutor
5456 Views

How do you determine the shape and bond angle of an ammonia molecule?

Firstly, how many electrons does nitrogen have in its outer shell?... Nitrogen is in group 5, so 5.How many more electrons does nitrogen need to give it a full outer shell?... 8 electrons provide a full oute...
Answered by • Chemistry tutor
5895 Views

Describe how you would differentiate a sample of butanal and butan-2-one.

You would add tollen's reagent to both samples. The butanal would form a silver mirror, whereas, butan-2-one would remain unchanged. This is due to the fact that an aldehyde can be oxidised to a carboxylic a...
Answered by • Chemistry tutor
16244 Views