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Instant // Instant
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To cast a split card, choose one of its halves to cast. There's no way to cast both halves of this split card.
Split cards have two card faces on a single card. The characteristics of the half you didn't cast are ignored while the spell is on the stack.
Each split card is a single card. For example, if you discard a split card, you've discarded one card, not two. If an effect counts the number of sorcery cards in your graveyard, Assault // Battery counts once, not twice.
Each split card has two names. If an effect instructs you to choose a card name, you may choose one of those names, but not both.
A split card's characteristics are a combination of its two halves while it is not on the stack. For example, Assault // Battery has a mana value of 5 while it is in your library. If an effect allows you to search your library for a card with mana value 4 or less, you can't find Assault // Battery.
If an effect allows you to cast a spell with certain characteristics, consider only the characteristics of the half you're casting. For example, if an effect allows you to cast a sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Assault this way, but not Battery.
Chaos will stop any creature from being declared as a blocker that turn, including ones that weren't on the battlefield as Chaos resolved.
Casting Chaos after blockers have been declared won't cause any of those blocks to be undone.