Which of the following are decomposition reactions?
~there can be more then one answer~
a. k2co3 (s) → k2o (s) + co2 (g)
b. 2na (s) + cl2 (g) → 2nacl (s)
c. 2lioh (s) + co2 (g) → li2co3 (s) + h2o (l)
d. 2so3 (g) → 2so2 (g) + o2 (g)

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Which are causes of mechanical weathering? (check all that apply) a. acid rain b. plant growth c. animal actions d. carbon dioxide e. pressure release i chose b & e and got the question wrong.