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Predict whether the lattice energy of magnesium oxide, MgO, is more or less exothermic than the lattice energy of magnesium sulfide, MgS. Justify your answer in terms of the sizes and the charges of the ions involved.

To start with, we can clearly see that the difference between MgO and MgS is the anions, we have O(2-) and S(2-). As we know (from looking at the periodic table) O(2-) has a smaller ionic radius, and ther...

HA
Answered by Huzair A. Chemistry tutor
20178 Views

When a new antigen is presented to the immune system, an immune response leads to antibodies are released. The second time this happens it is much faster - explain why

In the primary immune response, there is antigen presentation followed by clonal selection, expansion and differentiation of helper t cells. This leads to plasma cells releasing antibodies and the develop...

MR
Answered by Maxine R. Biology tutor
3092 Views

How do I use the imperfect and preterite tenses together to describe a completed event?

Well, let's start with an example. ej. Estaba atravesando la calle y de repente un coche se estralló contra un árbol. (ex. I was crossing the road and all of a sudden a car crashe...

GK
Answered by Gregory K. Spanish tutor
2227 Views

What is the meaning of actus reus and mens rea?

Actus reus and mens rea are latin terms used in Criminal Law in England and Wales. Actus reus refers to the, "guilty act" of a crime, and mens rea refers to the, "guilty mind" of a cri...

EG
Answered by Erika G. Law tutor
8958 Views

What is an oxidising agent?

A molecule which donates electrons

ND
Answered by Niamh D. Chemistry tutor
2478 Views

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