What type of reaction is represented in the following example?
2c2h4o(g) + 5o2 (g) 4co2 (g) + 4h2o (l) δh = -2385 kj
exothermic
endothermic

Explanation:

A chemical reaction in which heat energy is absorbed by the reactant molecules is known as an endothermic reaction.  

For example,

The value of = +ve for endothermic reaction.

Whereas a chemical reaction in which heat energy is released by the reactant molecules is known as an exothermic reaction.  

For example, is an exothermic reaction.

The value of = -ve for exothermic reaction.

Also, the given reaction,          

It is also an exothermic reaction because heat is releasing as value of is negative.

Thus, we can conclude that the given reaction is exothermic in nature.

pure substance: iron,copper

impure substance: water,charcoal

i think that the answer is c