Chemical Reactions and Solubility Concepts

The video tutorial explains the reaction of copper(II) bromide (CuBr2) with water (H2O). It begins by introducing the compounds and the need to determine if CuBr2 is soluble in water. The solubility rules are discussed, confirming that CuBr2 dissolves and dissociates into copper(II) ions (Cu2+) and bromide ions (Br-). The tutorial then explains how to represent the equation, noting that the ions are aqueous. Different ways to write the equation are also mentioned, such as placing H2O above the arrow. The video concludes with a summary of the reaction and its representation.

What is the main objective when copper(II) bromide is added to water?

• To observe a color change

• To measure the temperature change

• To find out if it dissolves and dissociates into ions

• To determine if it forms a precipitate

According to solubility rules, what can be said about the solubility of bromide ion compounds?

• They are soluble only in hot water

• They are always insoluble

• They are soluble with few exceptions

• They are generally insoluble

What is the charge on the copper ion when copper(II) bromide dissociates in water?

• 2-

• 1+

• 2+

• 1-

How many bromide ions are present when copper(II) bromide dissociates in water?

• One

• Two

• Three

• Four

What does the term 'aqueous' indicate in a chemical equation?

• The substance is a solid

• The substance is dissolved in water

• The substance is a gas

• The substance is a liquid

Where can water sometimes be placed in a chemical equation involving dissolution?

• To the left of the reactants

• Below the arrow

• Above the arrow

• To the right of the products

What is the final form of the equation for the reaction of copper(II) bromide with water?

• CuBr2 + H2O → Cu + Br2

• CuBr2 + H2O → Cu2+ + 2Br-

• CuBr2 + H2O → CuBr2(aq)

• CuBr2 + H2O → CuBr + Br-