4. Which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid? $$ \begin{array}{lll} ext { A) Lump } & ext { B) Bar } & ext { C) powdered }\end{array} $$

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4. Which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid? $$ \begin{array}{lll}	ext { A) Lump } & 	ext { B) Bar } & 	ext { C) powdered }\end{array} $$

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To determine which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid, we need to consider the surface area of the zinc samples. The reaction rate of a solid with a liquid is influenced by the surface area available for the reaction.

1. **Lump Zinc (A)**: This form has a relatively small surface area compared to its volume. The reaction will occur only on the outer surface of the lump.

2. **Bar Zinc (B)**: This form has a larger surface area than a lump but is still limited compared to powdered zinc. The reaction will be faster than with the lump but slower than with powdered zinc.

3. **Powdered Zinc (C)**: This form has the largest surface area because it consists of many small particles. The increased surface area allows for more contact with the hydrochloric acid, leading to a faster reaction.

### Conclusion:
The powdered zinc (C) will react fastest with dilute hydrochloric acid due to its larger surface area, allowing for more effective interaction with the acid.
Powdered zinc (C) will react fastest with dilute hydrochloric acid because it has the largest surface area, allowing more contact with the acid.

4. Which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid? \( \begin{array}{lll}\text { A) Lump } & \text { B) Bar } & \text { C) powdered }\end{array} \)

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