Question

checkpoint: the demonstration shown in the diagram below indicates that powdered limestone reacts faster than a single large piece of limestone of equal mass when both are placed in acid. 1. the most likely reason powdered limestone reacts faster is that it has a. less total volume b. more chemical bonds c. more total surface area d. lower density 2. as a particle of sediment in a stream breaks into several smaller pieces, the rate of weathering of the sediment will a. decrease due to a decrease in surface area b. decrease due to an increase in surface area c. increase due to a decrease in surface area d. increase due to an increase in surface area 3. the four limestone samples illustrated below have the same composition, mass, and volume. under the same climatic conditions, which sample will weather the fastest? four images of different - shaped limestone samples labeled a, b, c, d 4. a rock will weather faster after it has been crushed because its a. volume has been increased b. surface area has been increased c. density has been decreased d. molecular structure has been altered.

Explanation:

1. Powdered limestone has more surface area exposed to the acid, which increases the reaction rate. So the answer is C as more total surface area allows for more contact between the limestone and the acid.
2. When a sediment particle breaks into smaller pieces, its surface area increases. More surface area means more exposure to weathering agents, so the rate of weathering increases. The answer is D.
3. The sample with the most broken - up and fragmented structure (D) has the largest surface area among the four samples. Under the same climatic conditions, the one with the largest surface area will weather the fastest.
4. Crushing a rock increases its surface area. With a larger surface area, more of the rock is exposed to weathering agents, so it weathers faster. The answer is B.

Answer:

1. C. more total surface area
2. D. increase due to an increase in surface area
3. D
4. B. surface area has been increased