Higher Chemistry of Skincare and Fragrances

Which of the following is a characteristic of free radicals?

• They have a full outer electron shell.

• They are highly reactive due to unpaired electrons.

• They are stable molecules.

• They are negatively charged ions.

What is the primary role of free radical scavengers in skincare products?

• To increase the pH level of the skin.

• To neutralise free radicals and prevent skin damage.

• To act as a moisturiser.

• To provide fragrance to the product.

Which of the following is a common source of terpenes?

• Synthetic chemicals.

• Essential oils from plants.

• Heavy metals.

• Plastic materials.

In a free radical chain reaction, what is the step called where radicals are generated?

• Termination.

• Propagation.

• Initiation.

• Elimination.

Which of the following is an example of a free radical scavenger?

• Vitamin C.

• Sodium chloride.

• Water.

• Ethanol.

Which of these formulae could be a terpene?

What causes the formation of free radicals?

• UV Light

• Freezing.

• Condensation.

• Filtration.

Terpenes are primarily composed of which type of hydrocarbon units?

• Alkanes.

• Alkenes.

• Alkynes.

• Aromatics.

Which of the following is NOT a property of free radicals?

• They have an unpaired electron.

• They are stable and inert.

• They can initiate chain reactions.

• They are highly reactive.

What is the main function of antioxidants in skincare?

• To provide a cooling effect.

• To protect the skin from oxidative damage.

• To increase skin pigmentation.

• To exfoliate the skin.