Explain why the element nickel has a high melting point
Nickel is a metal and therefore it contains positive ions, called protons, which are surrounded by a sea of delocalised electrons, which are negative ions. There is a strong force of attraction between these positive and negative ions, and this requires a large amount of energy to break. This means that a large amount of heat energy needs to be applied to break the bonds, resulting in a high melting point.
JD
Related Chemistry A Level answers
All answers ▸Write equations and give the mechanism for the reaction of butanone with: 1) NaBH4 and 2) HCN
BeCl2 has a linear shape with a bond angle of 180 degrees, where as H2O has a bent shape with a bond angle of 104.5 degrees. Explain why these molecules have different shapes despite having the same general formula of AB2.
Excess KCN(aq) is added to a solution of [Co(H2O)6]2+. Identify the complex ion formed and predict its shape and charge.
Why doesn't chlorine form hydrogen bonds even though it is more electronegative than nitrogen?