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Chemical formula

Example: Balanced Chemical Equations with Subscripts Water: $$\ce{H2O}$$ Carbon dioxide: $$\ce{CO2}$$ Iron(III) hydroxide (Rust reaction): $$\ce{4Fe + 3O2 + 6H2O -> 4Fe(OH)3}$$ Copper(II) sulfate pentahydrate: $$\ce{CuSO4 * 5H2O}$$ Chemical Formulas in Chemistry Chemical formulas are the symbolic representations of chemical substances. They show the elements present in a compound and the ratio in which the atoms of these elements combine. Chemical formulas are essential for understanding the composition, structure, and behavior of compounds in chemical reactions. 1. What is a Chemical Formula? A chemical formula uses symbols of elements and numerical subscripts to represent the composition of a substance. For example, the formula for water is: $$ \ce{H2O} $$ This indicates that each water molecule is made up of 2 atoms of hydrogen and 1 atom of oxygen. 2. Types of Chemical Formulas Empirical Formula Molecular Formula Structural Formula...
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Osmotic Pressure

Important questions based on Osmotic pressure 



1. What are isotonic solutions ? Provide one example . 

Answer : Solutions having equal osmotic pressure are called isotonic solutions , e.g. 0.1 M glucose and 0.1 M sucrose solutions . 

2. What is Van't Hoff equation for dilute solution ? 

Answer : πV = nRT  where n is the no of moles of solute present in V litres of solution , π is osmotic pressure , T is temperature and R is gas constant or solution constant . 

3. Why does water from the soil rise to the top of a tall tree ? 

Answer : Due to osmosis through the roots because root cell walls are made of semipermeable membrane . 

4. What happens when blood cells are placed in pure water ? 

Answer : Due to osmosis , water molecules move into blood cells through the cell walls . As a result , blood cells swell and may even burst . 


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