Thursday, June 4 — Day 15

Review week, lap 3.

The deal today

9:30 to 12:00 study, with two 20-minute breaks.
22 questions. A and B now share nothing — B is the harder set.
Phones off 9:30 to 1:00. The 12:00-1:00 hour is yours, no screen.

Focus today

Valence — across all three rows

H → 1 (shares its 1; that's H₂ and water).
C → 4 (group 14, the universal builder).
P → 5 (group 15, row 3 — wants 3 more or shares).

If you can do these without the table, valence is solved.

Peace — held vs. failed

Westphalia, 1648 and Paris, 1783: held, included everyone.
Good Friday, 1998: ended the violence in Northern Ireland — the deal both sides voted for. That's why it held.
Abraham Accords, 2020: real agreement, but the Palestinians weren't at the table.

The pattern: deals that include everyone affected tend to hold; deals that leave out the people whose lives are at stake tend to fail.

Math

Divide returns (flip the second fraction, then multiply).
Two-digit × two-digit breakdowns (bigger today — slow down on the last step).
Add, subtract, multiply, GCF, LCM.

Today's exam (22 questions)

9 math (2 multiplication, GCF, LCM, add, subtract, divide, multiply)
5 science (3 valence + 2 protons/neutrons)
5 history (4 peace + WWII)
3 evolution (Big Bang, Earth forms, Homo sapiens at 0.3)

Warm-up

Valence practice list.
The four accord stories out loud.

Help links

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