Steel joints often separate sections of concrete bridges. why? a. an increase in kinetic energy can cause the bridge to contract. b. a decrease in temperature can cause the materials to expand. c. thermal expansion can cause the materials to shrink. d. thermal expansion can cause the concrete to expand and crack.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

What are the chemical names of these compounds? ke: mg3n2: reset next

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.