C1g-smells Flashcards
What is the word equation for esterification?
Acid+Alcohol–>Ester+Water
What are the necessary properties of perfumes?
Evaporates easily Non-toxic Doesn't react with water Doesn't irritate the skin Insoluble in water
Why does a perfume need to evaporate easily?
So perfume particles can easily reach the nose
Why does a perfume need to be non toxic?
So it doesn’t poison you
Why does perfume need to be able to not react with water?
So it doesn’t react with perspiration
Why does perfume need to be able to not irritate the skin?
Otherwise perfume could not be put directly on the skin
Why does perfume need to be insoluble in water?
So it cannot be washed off easily
Explain the volatility of perfumes in terms of kinetic theory?
Particles need sufficient energy to overcome the attraction to other molecules in the liquid to evaporate
Weak attraction exists between particles in the liquid perfume so it is easy to overcome this attraction
What is a solvent?
The liquid you use to make a solution
What is a solute?
The thing you dissolve
What is a solution?
The mixture of the solute and solvent that does not seperate out
What is soluble?
Does dissolve
What is insoluble?
Doesn’t dissolve
Why won’t water dissolve nail varnish colours?
- Water molecules + water molecules > water molecules + nail varnish particles
- nail varnish particles + nail varnish particles > water molecules + nail varnish molecules
> = attraction between … Stronger
Why are new cosmetics tested?
To make sure they’re safe to use
