Which of the following are decomposition reactions? 1. ch4 (g) + o2 (g) → co2 (g) + h2o (l)
2. cao (s) + co2 (g) → caco3 (s)
3. mg (s) + o2 (g) → mgo (s)
4. pbco3 (s) → pbo (s) + co2 (g)
Then the multiple choice options are:
A. 4 only
B. All are decomposition reactions
C. 2,3 and 4
D. 2 and 3

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.