Water

Question 1

How much water is in the human body

Answer 1

60-70%

Question 2

First 3 function of water in the human body

Answer 2

Only substances in water can enter cell membrane of our cells

water Carries away dissolved wastes from our cells and wastes excreted in liquid

ions necessary for body process such as movement and generation of nerve impulses and are formed when an ionic substance is dissolved in water

Question 3

Next 3 functions of water in the human body

Answer 3

Water and water-based solutions act as Lubricants - your joints are lubricated by watery fluid called synovial fluid

water regulates temperature as it does not heat up easily or cool down easily,

our brains are partially protected against shock by a watery layer

Question 4

Last 2 functions of water in the human body

Answer 4

Sense organs require water - our eyes are filled with thick fluid; heading depends upon a fluid-filled structure called the cochlea that detects and transmits vibrations,

hydrolytic enzymes the chemical reactions that take place in your body rely on chemicals called enzymes. Hydrolytic enzymes involved in breaking bonds between molecules - to do this it requires water

Question 5

How is water bonded

Answer 5

Covalently bonded. Strong bond

Question 6

Why does the oxygen in water have a slight negative net charge and the hydrogen a small net positive charge

Answer 6

Water is polar

Question 7

When do hydrogen bonds occur

Answer 7

Whenever a partially positive H is attracted to a partially negative atom it is represented by a dotted line because it is weak and fairly easily broken. Most weak out of all bonds

Question 8

First 3 chemical characteristics of water

Answer 8

H-bonding makes it have a low freezing point and a high boiling point - so that it is liquid at body temperature,

water has a specific heat capacity: it absorbs much heat before it warms up or boils and gives off much heat before it freezes - due to H-bonding,

water has a high cohesiveness - water molecules tend to cling together and draw dissolved substances along with it - makes it good for transporting materials through tubes

Question 9

Last two chemical properties of water

Answer 9

Liquid water is more dense than ice because of H-bonding so ice will form on top - ice layers help protect organisms below

water dissolves other polar molecules - is one of the best solvents known - called the “universal solvent”