Dissociation and Ions in Chemistry

The video tutorial explains dissociation equations, focusing on the separation of ions in water. It covers the concept of dissociation, types of ions, and the role of water in breaking ionic compounds like sodium chloride. The process is described as a physical change, with examples and practice problems provided to reinforce learning. The tutorial concludes with a summary of key concepts.

What does the term 'dissociation' refer to in chemistry?

• Evaporating substances

• Combining elements

• Breaking apart ions

• Creating new compounds

Which of the following is a cation?

• Oxygen

• Hydrogen

• Sodium

• Chlorine

What happens to sodium chloride when it is dissolved in water?

• It remains unchanged

• It forms a new compound

• It evaporates

• It dissociates into ions

In the dissociation of sodium chloride, which part of the water molecule is attracted to sodium ions?

• Both hydrogen and oxygen

• Neither hydrogen nor oxygen

• Hydrogen

• Oxygen

What type of change is dissociation considered to be?

• Chemical change

• Nuclear change

• Biological change

• Physical change

What happens to the ions of a salt when the water evaporates?

• They remain dissolved

• They disappear

• They recombine to form the original salt

• They form a new substance

In the dissociation of iron chloride, how many chlorine ions are produced per iron ion?

• Four

• Three

• Two

• One

What is the state of matter for a salt before it is dissolved in water?

• Solid

• Aqueous

• Gas

• Liquid

Which of the following salts dissociates into two sodium ions and one sulfur ion?

• Lithium phosphide

• Sodium sulfide

• Iron chloride

• Sodium chloride

What is the charge of phosphorus when lithium phosphide dissociates in water?

• Positive

• Negative

• Neutral

• Variable