GACE Chemistry 5

Question 1

Which of the following represents a beta-minus (β⁻) decay reaction?

Accepted Answer

A nucleus emits an electron and an antineutrino

Answer

Beta-minus decay occurs when a neutron converts to a proton, emitting an electron (beta particle) and an antineutrino.

Question 2

What does a negative ΔG (Gibbs free energy) value indicate about a chemical reaction?

Accepted Answer

The reaction is spontaneous under given conditions

Answer

A negative ΔG means the reaction releases free energy and proceeds spontaneously without continuous external energy input.

Question 3

Which separation technique is most appropriate for separating a mixture of compounds based on their differential affinity for a stationary phase versus a mobile phase?

Accepted Answer

Chromatography

Answer

Chromatography separates compounds by exploiting differences in how strongly each component interacts with the stationary phase compared to the mobile phase.

Question 4

Which of the following molecules is nonpolar despite containing polar bonds?

Accepted Answer

CO₂

Answer

CO₂ has two polar C=O bonds, but they are arranged linearly and their dipoles cancel, making the molecule nonpolar.

Question 5

What is the percent yield if a reaction theoretically produces 50.0 g of product but only 38.5 g is actually collected?

Accepted Answer

77.0%

Answer

Percent yield = (actual yield / theoretical yield) × 100 = (38.5 / 50.0) × 100 = 77.0%.

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE Chemistry 5