Why in general does not proceed with a uniform rate throughout?

Explanation

### Step-by-Step Solution

1. **Understanding the Rate of Reaction**: The rate of a chemical reaction refers to how quickly reactants are converted into products. It is measured as the change in concentration of reactants or products over time.

2. **Dependence on Concentration**: The rate of reaction is influenced by the concentration of the reactants. Generally, a higher concentration of reactants leads to a faster reaction rate because there are more particles available to collide and react.

3. **Consumption of Reactants**: As the reaction proceeds, the reactants are consumed to form products. This consumption results in a decrease in the concentration of the reactants over time.

...