Lesson 3(properties Of Water) Flashcards
(15 cards)
What type of bond is formed in water?
Covalent bond
Water is covalently bonded, meaning that the atoms share electrons.
What charge does the oxygen atom in water have?
Slight net negative charge
The oxygen atom has a slight net negative charge due to the unequal sharing of electrons.
What charge do the hydrogen atoms in water have?
Slight net positive charge
The hydrogen atoms have a slight net positive charge because the electrons are more attracted to the oxygen.
What type of bond is represented by a dotted line?
Hydrogen bond
Hydrogen bonds are represented by dotted lines because they are weak and easily broken.
What is the main reason hydrogen bonds are significant?
They explain some unique properties of water
When numerous, hydrogen bonds can have a large effect on water’s properties.
What percentage of the human body is water?
Approximately 70%
Human life requires water, and we are made up of about 70% water.
Fill in the blank: Only __________ dissolved in water can enter/cross the cell membrane.
Substances
This includes molecules like glucose and amino acids.
What role does water play in waste removal from cells?
Carries away dissolved wastes
Water helps in excreting wastes through sweat and urine.
Which ions in solution are necessary for many body processes?
Ca²⁺, Na⁺, K⁺
These ions are essential for muscle movement and nerve impulse generation.
What function does water serve for joints?
Lubrication
Joints are lubricated by a watery fluid to reduce friction.
How does water protect the brain?
Partially protects against shock
The brain is cushioned by a watery layer that absorbs impacts.
What is a unique characteristic of water regarding its abundance?
Abundant throughout the biosphere
Life is believed to have started in water, making it essential for all life forms.
What does water’s high cohesiveness help with
Makes it good for transporting materials through tubes
Liquid water is more….than solid ice
Dense
What are the properties of water?
Universal solvent, cohesion and adhesion, high surface tension, high heat capacity, changes in density
