Advanced Chemistry quiz

More questions about Advanced Chemistry

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which column of elements on the periodic table is mostly unreactive?

   Answer: noble gases

   Why: Argon proves the point: it makes up about 0.93 percent of the air, and welders flood their arcs with it because it will not react.

2. 2 Medium

   Which aqueous solution has the lowest freezing point at $1.0\text{ M}$?

   Answer: Aluminum chloride

   Why: That four-ion split is the van 't Hoff factor at work, named for the chemist who won the first Nobel Prize in Chemistry in 1901.

3. 3 Hard

   Which reaction mechanism proceeds through a carbocation intermediate?

   Answer: $S_N1$

   Why: Tertiary alkyl halides react fastest here because tertiary carbocations are the most stable, and the rate ignores the nucleophile.

4. 4 Easy

   Besides gold, which pure metal is not silvery in color?

   Answer: copper

   Why: Copper absorbs blue and green light and reflects the rest, giving its orange-red glow; caesium is another pure metal with a warm, non-silvery tint.

5. 5 Medium

   What smelly gas is primarily responsible for the odor of rotten eggs?

   Answer: Hydrogen sulfide

   Why: Bacteria break the egg's sulfur rich proteins down into hydrogen sulfide, a gas the human nose can detect at roughly half a part per billion.

6. 6 Hard

   Which enzyme has the highest known turnover number in biological systems?

   Answer: Catalase

   Why: Reported values reach 40 million per second: one catalase molecule can break down that many peroxide molecules every second.