Chromium Reactions and Ionic Equations

The video tutorial explains how to write a balanced net ionic equation for the reaction between chromium(III) chloride and sodium hydroxide. It begins with balancing the molecular equation, identifying the states of substances, and then proceeds to write the complete ionic equation. The tutorial emphasizes the importance of charge balance and the identification of spectator ions to derive the net ionic equation. The video concludes with a check for charge balance and a reminder to ensure the correct number of atoms.

What is the first step in balancing the molecular equation for the reaction between chromium(III) chloride and sodium hydroxide?

• Balance the chromium atoms.

• Balance the hydroxide ions.

• Balance the chlorine atoms.

• Balance the sodium atoms.

Which of the following is true about the solubility of sodium hydroxide?

• It is insoluble in water.

• It does not dissociate in water.

• It is a strong electrolyte.

• It is a weak electrolyte.

What is the state of chromium hydroxide in the reaction?

• Aqueous

• Liquid

• Gas

• Solid

What is the role of solubility rules in determining the states of substances?

• They predict the temperature of the reaction.

• They determine the color of the precipitate.

• They indicate which substances are soluble or insoluble.

• They help identify the charge of ions.

What is the charge of the chromium ion in the complete ionic equation?

• 3+

• 4+

• 2+

• 1+

How do you determine the charge of a transition metal in a compound?

• By the number of atoms in the compound.

• By the charge of the other ions in the compound.

• By the solubility of the compound.

• By the color of the compound.

Why are spectator ions removed when writing the net ionic equation?

• They change their state during the reaction.

• They form a precipitate.

• They are insoluble.

• They do not participate in the reaction.

Which ions are considered spectator ions in this reaction?

• Chromium ions

• Hydroxide ions

• Chromium hydroxide

• Sodium ions

What issue arises if the charges in the net ionic equation do not balance?

• The reaction is exothermic.

• The precipitate dissolves.

• The reaction does not occur.

• The equation is incorrect.

What is the final step in ensuring the net ionic equation is correct?

• Checking the solubility of the products.

• Balancing the number of atoms.

• Ensuring the charges are balanced.

• Identifying the spectator ions.