What happens to ordinary food (chullin) that is a 2nd derivative — can it make a 3rd?
Halacha 2: for ordinary food, a 2nd derivative is pasul (disqualified) — it cannot create a 3rd derivative in chullin. The 3rd degree does not exist for ordinary food.
Question 2
To what degree is food that is 3rd-degree terumah — can it create a 4th in terumah?
Halacha 3: a 3rd degree terumah item is pasul — it cannot create a 4th derivative in terumah. The 4th degree exists only for kodesh.
Question 3
Terumah that became a 3rd derivative touches KODESH liquids. What happens to those liquids?
Halacha 8: 3rd-degree terumah touching kodesh liquids makes them primary (techilah) — liquid impurity always transmits as primary.
Question 4
What is the status of the two loaves of Shavuot for purposes of food impurity law?
Halacha 13 (halacha 12): the two loaves (when their surface hardened in the oven) are included in the definition of 'kodesh' for food impurity law.
Question 5
One ate a 3rd-degree terumah item. Can he then touch terumah food?
Halacha 10 (halacha 11): the Sages imposed a stringency on eating — one who ate 3rd-degree terumah may not eat more terumah until immersing — but touching terumah remains permitted.