Water Part1 Flashcards
What is the primary source of water?
Rainwater
Rainwater maintains the water levels in all water bodies on Earth.
What is pure water?
A colourless, odourless, and tasteless covalent compound formed by hydrogen and oxygen in the ratio 2:1
Pure water is essential for life and is often referred to as the elixir of life.
What happens to copper sulphate when it is heated?
Its colour changes from blue to white
This change illustrates the reversible nature of some chemical reactions.
Fill in the blank: Water is formed by the combination of hydrogen and _______.
oxygen
What are the three main sources of water?
Rainwater, surface water, and groundwater
These sources contribute to the overall water supply on Earth.
How does rainwater contribute to water bodies?
By maintaining their water levels
Rainwater plays a crucial role in the water cycle.
True or False: Life on Earth began in oceans.
True
Oceans are vital for the origin and sustenance of life.
What is the process through which rainwater is formed?
Evaporation and condensation
These processes are key components of the water cycle.
What is the significance of water for living organisms?
It is essential for the existence of life
Water is often called the source of life due to its vital role in biological processes.
What occurs when a few drops of water are added to white copper sulphate?
It becomes blue again
This demonstrates the hydration of copper sulphate.
What is water of crystallisation?
Water molecules that are part of the crystalline structure of a compound
These water molecules are essential for the stability of certain compounds.
What is hardness of water?
The presence of dissolved minerals, primarily calcium and magnesium
Hardness can affect water’s properties and usability.
What are methods for removal of hardness in water?
Ion exchange, reverse osmosis, and precipitation
These methods help in purifying water for various uses.
What is a true solution?
A homogeneous mixture where solute particles are completely dissolved
True solutions have a uniform composition throughout.
What is a colloid?
A mixture where tiny particles are dispersed but not dissolved
Colloids exhibit properties between solutions and suspensions.
