Electrolytes and Ionic Compounds

The video explains the difference between electrolytes and non-electrolytes, focusing on how ionic compounds like sodium chloride dissociate in water to conduct electricity. It contrasts this with pure water, which does not conduct electricity due to the absence of ions. The dissociation of magnesium nitrate is used as an example to illustrate chemical equations and stoichiometry. Finally, the video discusses covalent compounds like sugar, which dissolve but do not dissociate in water, thus not conducting electricity.

What is the primary reason an electrolyte solution can conduct electricity?

• Presence of water molecules

• Presence of ions

• High temperature

• Low pH level

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

• It evaporates

• It dissociates into ions

• It remains as solid

• It forms a precipitate

What is the role of water molecules when an ionic compound dissociates?

• They change color

• They surround the ions

• They form a solid

• They evaporate

Why is pure water considered a non-electrolyte?

• It is too dense

• It has a high boiling point

• It lacks ions

• It is acidic

Why does tap water conduct electricity?

• It is pure

• It is acidic

• It contains dissolved substances

• It is heated

What is the charge on the magnesium ion in magnesium nitrate?

• +1

• +2

• -1

• -2

How many nitrate ions are produced from the dissociation of one magnesium nitrate molecule?

• One

• Two

• Four

• Three

What is the stoichiometric ratio of magnesium ions to nitrate ions in the dissociation of magnesium nitrate?

• 2:1

• 1:2

• 1:1

• 3:1

What is the main difference between the dissolution of ionic and covalent compounds in water?

• Ionic compounds evaporate

• Covalent compounds dissociate

• Ionic compounds dissociate into ions

• Covalent compounds form precipitates

Which of the following is an example of a covalent compound that dissolves in water but does not dissociate?

• Magnesium nitrate

• Sodium chloride

• Calcium carbonate

• Sugar