Question

3. If some red-brown Cu(s) is heated with a Bunsen burner in the presence of O,(g), some black solid, copper(II) oxide, CuO(s), forms. Write the balanced equation for this reaction. Classify this reaction as one of the five general types.

Answer 1

3. The reaction is : Cu (s) + O₂ (g) $\rightarrow$ CuO

Now, looking on the left side of the reaction equation there is 1 Cu and 2 O whereas on the left side there is 1 Cu and 1 O. To balance the number of O we'll have to multiply CuO by 2 but then number of Cu on right will become 2 due to which we'll have to multiply Cu on the left side with 2.

2Cu (s) + O₂ (g) $\rightarrow$ 2CuO

The above reaction is balanced.

This reaction is a combination reaction.

In a combination reaction two or more substances combine to form a single new substance as in this rxn copper and oxygen combine to form copper oxide.

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