when a rock undergoes mechanical weathering such as frost wedging it breaks apart into smaller pieces. how does this process affect the rocks total surface area

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.