💿 What are Half Equations

note

This is an authentic video. Do not try to understand every word you hear.
Watch and listen for general and specific information by completing the following tasks.

Before you watch:

Exercise 1. Look at the following definitions, related to the topic of the video, and write what they define.

Video

While you watch:

Exercise 2. Watch the video (till 0:52) and answer the following questions.

Exercise 3. Why is the solution turned blue? Answer these questions. PAUSE the video and think. Then, watch the video (0:53-1:50) and check your guesses.

Exercise 4. Watch the video (1:51-3:07) about another equation and answer the following questions.

Exercise 5. See if you can write the two half equations. PAUSE the video and work out the answer. Then, watch the video (3:08-till the end) and check yourself.

2Fe⁺³ + 2I^-→ I₂ + 2Fe⁺²

After you watch:

Exercise 6. Write two half-equations for the following reactions. For each half-equation state whether oxidation or reduction is occurring.

a) Cl₂ + 2Br^- → Br₂ + 2Cl^-
b) 2Ca + O₂ → 2CaO
c) 4Al + 3O₂ → 2Al₂O₃