EmSAT Chemistry 5

Question 1

Which type of isomerism is exhibited by cis-2-butene and trans-2-butene?

Accepted Answer

Geometric (cis-trans) isomerism

Answer

Cis- and trans-2-butene differ in the spatial arrangement of groups around the C=C double bond, making them geometric isomers.

Question 2

Which of the following correctly describes a buffer solution?

Accepted Answer

A solution that resists changes in pH on addition of small amounts of acid or base

Answer

A buffer solution contains a weak acid and its conjugate base (or weak base and conjugate acid) that absorb added H⁺ or OH⁻ ions, keeping pH nearly constant.

Question 3

In the periodic table, which trend is observed for ionisation energy across Period 3 (Na to Ar)?

Accepted Answer

Generally increases

Answer

Across a period, nuclear charge increases while shielding remains roughly constant, so electrons are held more tightly and ionisation energy generally increases.

Question 4

What type of reaction produces a polymer from many alkene monomers?

Accepted Answer

Addition polymerisation

Answer

In addition polymerisation, the C=C double bonds of alkene monomers open and join together without losing any small molecules.

Question 5

A sample of gas occupies 2.0 L at 300 K and 100 kPa. What volume does it occupy at 600 K and 100 kPa?

Accepted Answer

4.0 L

Answer

At constant pressure, Charles's Law gives V₁/T₁ = V₂/T₂; (2.0/300) = V₂/600, so V₂ = 4.0 L.

EmSAT Practice Test

EmSAT Practice Test

EmSAT Chemistry 5