C1 Flashcards Preview

Science 1 > C1 > Flashcards

Flashcards in C1 Deck (29)
Loading flashcards...
1
Q

How do emulsifiers work

A

Hydrophilic end binds with water

Hydrophobic end binds with oil

2
Q

What happens to protein molecules when you heat them?

A

They denature

3
Q

Why are potatoes easier to digest when cooked?

A

The cells wall rupture
Starch grains swell and spread out
Gets rid of rigid wall of cellulose

4
Q

What is the equation for thermal decomposition and and example of I

A

Sodiumhyrdocarbonate -> sodium carbonate + carbon dioxide + water

Baking powder when heated makes cake rise

5
Q

Equation for a ester

A

Acid + alcohol -> ester + water

6
Q

Name 5 properties perfumes need

A
Easily evaporate
Non-toxic
Doesn't react with water 
Non irritable 
Insoluble in water
7
Q

Paint contains……..(3)

A

Solvent
Binding medium
Pigment

8
Q

What does the solvent do?

A

Thins paint, makes it easier to spread

9
Q

What does the pigment do?

A

Gives paint it’s colour

10
Q

What does the binding medium do

A

Holds pigments together and sticks them to the surface you’ve painted

11
Q

What are paints

A

Colloids

12
Q

Properties of water based paints

A

Ideal for inside walls
Fast drying
No harmful fumes

13
Q

Properties of oil based paints

A

Gloss paint
Dries in 2 stages
Ideal for outside doors

14
Q

What are thermochromic paints

A

Change colour when heated or become transparent

15
Q

What are phosphorescent pigments

A

Glow in the dark

Absorb natural/artificial light and store energy

16
Q

What is polymerisation

A

Lots of small monomers joining together to form polymers

17
Q

What is addition polymerisation

A

Monomers that have a double covalent bond open their double bonds and join together to make polymer chains

18
Q

What are unsaturated compounds

A

Molecules with at least one double covalent bond

19
Q

What are saturated molecules

A

Molecules with no double covalent bonds

20
Q

What do hydrocarbons contain?

A

Carbon and hydrogen atoms ONLY

21
Q

What is the formula for alliances

A

CnH2n+2

22
Q

What is the formula for alleges

A

CnH2n

23
Q

Equation for incomplete combustion

A

CnHn + O2 -> CO2 + C + CO + H2O

24
Q

Equation for complete combustion

A

CnHn + O2 -> CO2 + H2O

25
Q

Equation for cracking

A

Long hydrocarbon -> shorter Alkane + Alkene

26
Q

Conditions needed for cracking?

A

High temperature and a catalyst

27
Q

What use is cracking?

A

Petrol, diesel, polymers

28
Q

What are emulsifiers

A

Additives that make oil and water mix

29
Q

What causes acid rain and what does it lead to

A

Sulphur dioxide and oxides of nitrogens

Kills fish trees and statues