Potassium and Hydrogen Reactions

This video tutorial explains the reaction between potassium metal and water, focusing on the type of reaction, which is a single displacement reaction. The video suggests viewing water as HOH to simplify understanding. It discusses how potassium, a highly reactive metal, can replace hydrogen in water, forming potassium hydroxide and hydrogen gas. The activity series is used to confirm potassium's ability to displace hydrogen due to its higher reactivity.

What type of reaction occurs when potassium reacts with water?

• Decomposition

• Synthesis

• Single displacement

• Double displacement

How can water be represented to simplify understanding of the reaction?

• H2O

• HOH

• HHO

• OH2

In a single displacement reaction, what does the metal replace?

• The entire compound

• The solvent

• The negative ion

• The positive ion

What compound is formed when potassium reacts with water?

• K2O

• KOH

• KH

• KO2

What is the charge of the hydroxide ion in the reaction?

• 2-

• 2+

• 1+

• 1-

Why is potassium able to replace hydrogen in the reaction?

• Potassium and hydrogen have the same reactivity

• Potassium is a noble gas

• Potassium is more reactive than hydrogen

• Potassium is less reactive than hydrogen

Where does potassium rank in the activity series compared to hydrogen?

• Above hydrogen

• At the same level as hydrogen

• Below hydrogen

• Not in the activity series

What gas is released during the reaction of potassium with water?

• Oxygen

• Nitrogen

• Hydrogen

• Carbon dioxide

What is the state of hydrogen gas produced in the reaction?

• Monatomic

• Diatomic

• Triatomic

• Polyatomic