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Flashcards in C1g-smells Deck (21)
1

What is the word equation for esterification?

Acid+Alcohol-->Ester+Water

2

What are the necessary properties of perfumes?

Evaporates easily
Non-toxic
Doesn't react with water
Doesn't irritate the skin
Insoluble in water

3

Why does a perfume need to evaporate easily?

So perfume particles can easily reach the nose

4

Why does a perfume need to be non toxic?

So it doesn't poison you

5

Why does perfume need to be able to not react with water?

So it doesn't react with perspiration

6

Why does perfume need to be able to not irritate the skin?

Otherwise perfume could not be put directly on the skin

7

Why does perfume need to be insoluble in water?

So it cannot be washed off easily

8

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

9

What is a solvent?

The liquid you use to make a solution

10

What is a solute?

The thing you dissolve

11

What is a solution?

The mixture of the solute and solvent that does not seperate out

12

What is soluble?

Does dissolve

13

What is insoluble?

Doesn't dissolve

14

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

15

Why are new cosmetics tested?

To make sure they're safe to use

16

Why is testing cosmetics on animals banned in the EU?

Concerns about animal welfare

17

What is an argument for testing animals?

Its worth it to check they won't damage humans

18

What is an argument against testing on animals?

Its wrong to cause suffering to animals just to test the safety of a cosmetic
Results might not be conclusive

19

What is an ester?

Perfumes that can be made synthetically

20

Describe how to carry out a simple experiment to make an ester

1) 10cm3 of propanol in test tube
2) 10cm3 of methanoic acid in same tube
3) cork and shake
4) add 1cm3 of concentrated sulfuric acid in same tube
5) warm gently for 5 mins in water bath
6) tip contents into 150cm3 of sodium carbonate solution

21

What are the safety precautions when making an ester?

-gloves
-glasses
-no naked flames
-smell carefully (waft)