Hydrogen and sulfur react to form
A) HS.
B) H2S.
C) HS2.
D) H4S2.
Question 2
Which of the following reactions is a single replacement reaction?
A) HCl + NaOH NaCl + H2O
B) Mg + HCl H2 + MgCl2
C) CaCl2 + H2O CaCl2 2H2O
D) KClO3 KCl + O2
Question 3
Which of the following is an exothermic reaction?
A) burning propane gas in a barbecue
B) burning gasoline when driving a car
C) creating an explosion by detonating nitroglycerine
D) All of the above are exothermic reactions.