1. Effervescence: As the reaction proceeds, bubbles of carbon dioxide gas are released from the mixture. This effervescence is an indication that the reaction is taking place.

2. Color change: The initially blue copper carbonate solid gradually dissolves in the ethanoic acid, resulting in a pale green solution. The color change is due to the formation of copper ethanoate, which is soluble in water.

3. Formation of copper ethanoate crystals: As the reaction continues, copper ethanoate crystals start to form on the sides of the reaction vessel. These crystals are formed as the copper ethanoate becomes supersaturated in the solution and starts to precipitate out.

Chemical Equation:

The overall chemical equation for the reaction between copper carbonate and dilute ethanoic acid can be represented as follows:

$$CuCO_3(s) + 2CH_3COOH(aq) → Cu(CH_3COO)_2(aq) + H_2O(l) + CO_2(g)$$

In this equation, copper carbonate reacts with ethanoic acid to form copper ethanoate, water, and carbon dioxide gas.