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Flashcards in C1G - Smells Deck (17):
0

Cosmetics can be ?

Synthetic or natural. Depending on their source

1

Esters are what ?

Smells that are used in perfumes.

2

Are esters synthetic or natural ?

Can be both

3

What are the necessary properties of perfume ?

1) evaporates easily
2) non toxic
3) does not react with water
4) does not irritate the skin
5) insoluble in water

4

Word equation for esterification ?

Acid + Alcohol = Ester + Water

5

Why do perfumes need to be able to easily evaporate ?

Because if the can't the perfume particles won't reach your nose and you won't be able to smell it

6

If perfumes reacted with water what would happen ?

It would react with your sweat

7

In order to evaporate what do particles need ?

Sufficient energy to overcome the attraction to other molecules in the liquid

8

How come perfume evaporates easily ?

Weak attraction exists between molecules so they are able to overcome the attraction to one another

9

Lily tries to remove her nail vanish using water. It won't come off. Why ?

Attraction between water molecules is stronger than attraction between water molecules and nail vanish particles

10

Water is a solvent and salt is a solute. Explain ?

Water will dissolve salt. Salt will just dissolve.

11

Salty water. What is it ? Why ?

A solution because it's a solvent and a solute

12

Does soluble mean it won't dissolve ?

No. It means it will

13

What would we call something that doesn't dissolve ?

Insoluble

14

Why do we need to test cosmetics ?

To ensure they do not have an adverse effect on humans

15

Why would some companies test on animals ?

If the product has an adverse effect they'd rather it happen to an animal than happen to a human

It reduces the risk of humans being harmed

16

Why may some people be opposed to animal testing ?

Moral rights of animals because they cant have a say

Humans and animals could react differently to the product