Regents Chemistry 4

Question 1

Which gas law states that the volume of a gas at constant temperature is inversely proportional to its pressure?

Accepted Answer

Boyle's Law

Answer

Boyle's Law (P₁V₁ = P₂V₂) states that pressure and volume are inversely proportional at constant temperature.

Question 2

Which element is a metalloid (semimetal) on the periodic table?

Accepted Answer

Silicon

Answer

Silicon (Si) is a metalloid with properties intermediate between metals and nonmetals, widely used as a semiconductor.

Question 3

What is the correct name for the compound Fe₂O₃?

Accepted Answer

Iron(III) oxide

Answer

In Fe₂O₃, iron has an oxidation state of +3 (since 3 oxygens at -2 = -6, balanced by 2 Fe at +3 = +6), so it is iron(III) oxide.

Question 4

Which quantum number describes the shape of an electron's orbital?

Accepted Answer

Angular momentum quantum number (l)

Answer

The angular momentum quantum number (l) defines the shape of an orbital: l=0 is s (spherical), l=1 is p (dumbbell), l=2 is d, etc.

Question 5

In an electrochemical cell, oxidation occurs at the:

Accepted Answer

Anode

Answer

Oxidation (loss of electrons) always occurs at the anode in both galvanic and electrolytic cells.

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