How will the following systems react when an increase in pressure occurs? note all species are gases n2o4< --> 2no2

 N2O4 ↔ 2NO2

The  following system  react as below  when  increase in pressure  occurs

The equilibrium   will  shift towards the left (more N2O4  is produced)

   Explanation

When  pressure increases  the equilibrium  shift toward  the side  of reaction with fewer  moles of gas.

 In the reaction  of N2O4 ↔  2 NO2  there  is only  1  moles   of N2O4  and 2 moles of NO2.

Therefore increase  in pressure led to shift of equilibrium towards the left. ( more N2O4 is produced)

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

b is the correct answer

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