A.1. Make your own sentences with the following phrases
(i) a swarm of locusts
(ii) a flight of birds
(iii) a pile of garbage
(iv) a flock of sheep
(v) an army of soldiers
(vi) as pleased as punch
(vii) as rich as croesus
(viii) as cool as cucumber
(ix) as red as rose
(x) as white as snow

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen