Dissociation and Properties of KBr

This video tutorial explains the reaction between potassium bromide (KBr) and water (H2O). It begins by introducing KBr as an ionic compound composed of a metal (potassium) and a non-metal (bromine). The video then discusses the charges of ions, referencing the periodic table to identify potassium's +1 charge and bromine's -1 charge. The process of KBr dissolving in water is described, highlighting how it dissociates into potassium cations and bromide anions. The concept of aqueous solutions is introduced, explaining the use of 'aq' to denote substances dissolved in water. The video concludes with a summary of the reaction and its representation in chemical equations.

What type of compound is potassium bromide (KBr)?

• Molecular compound

• Metallic compound

• Ionic compound

• Covalent compound

What charge does potassium (K) have in the periodic table?

• +2

• -1

• +1

• 0

In which group of the periodic table is bromine (Br) found?

• Group 2

• Group 1

• Group 17

• Group 18

What happens to KBr when it is dissolved in water?

• It forms a precipitate

• It dissociates into ions

• It remains unchanged

• It evaporates

What are the ions formed when KBr dissociates in water?

• K2+ and Br2-

• K2+ and Br-

• K- and Br+

• K+ and Br-

What does 'aq' signify when written after an ion?

• The ion is in solid form

• The ion is in gaseous form

• The ion is dissolved in water

• The ion is in liquid form

Why is it unnecessary to write H2O on the product side of the equation?

• Because water evaporates

• Because 'aq' indicates the ions are dissolved in water

• Because the reaction does not occur

• Because water is not involved in the reaction