Which of the following statements about transition metals is true?
a. they are never found uncombined in nature.
b. they include familiar metals such as gold, silver, copper, and nickel.
c. they are so soft that they can be cut with an ordinary knife.
d. they are the most reactive of all the types of metals.

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Why are people not able to scuba dive in the deep part of the ocean

For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2