Unit 4 : Food Chemistry - Water Flashcards
1
Q
Describe polarity for properties of water
A
- Water is polar, due to this polarity water can form hydrogen bonds with other molecules
2
Q
Describe solubility for properties of water
A
- It is a universal solvent
- it dissolves components with either ionization or hydrogen bonding
3
Q
What term is used to describe substances that dissolve in water
A
- Hydrophilic
4
Q
What term is used to describe substances that do NOT dissolve in water
A
- Hydrophobic
5
Q
At what temperature is the density the highest for water ?
A
- 4 degrees Celsius
6
Q
How does sugar effect the freezing point of water ?
A
- It lowers the freezing point of water
7
Q
What is Water Activity ?
A
- It is an expression of relative humidity surrounding the food system
8
Q
What impacts does lower water activity have on foods?
A
- Inhibits microbial growth
- Provides textural characteristics such as crispiness and crunchiness
9
Q
What does highest specific heat mean?
A
- It means that it can absorb and lose the most heat when temperature increases or decreases by 1 degree celsius.
10
Q
Describe the role of water in the osmotic pressure of the cells
A
- during osmosis, water moves from low concentration to high
