Which of the following reactions is an example of a single replacement reaction? Select one:
a. C2H6 + O2 --> CO2 + H2O
b. HgO --> Hg + O2
c. CuCl2 + Al --> Cu + AlCl3
d. NO + O2 --> NO2

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

In which situation can a mixture always be called a solution

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution