Diffusion
sanaThe movement of molecules from higher concentration to lower concentration is called diffusion. Diffusion occurs down the concentration gradient. It is a spontaneous process. Diffusion continues till dynamic equilibrium is…
Multiple Choice Questions (MCQs)
Mixing of table salt in water makes: (a) Mixture (b) Compound (c) Colloidal (d) Solution Which of the followings is electrolyte? (a) glucose (b) NaCI (c) sugar (d) Ether For…
MODEL OBJECTIVE QUESTIONS
What are solutions, solute and solvents? Ans: A homogeneous mixture of two or more substances is called solution. The dissolved substance is called solutes. The substance which dissolves a solute…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES
TERMS DEFINITIONS Solution A homogeneous mixture of two or more substances is called solution. - Solute The dissolved substans Ice is called solutes Solvent The substance which. dissolves…
Colloidal System – Properties & Significance
A heterogeneous mixture in which solute particles are larger than molecules or ions but cannot be seen by naked eye is called colloidal solution. A system which shows properties of…
BUFFERS
The substance which resists change in pH is called buffer. Stable internal environment is maintained in animals. It requires a relatively constant pH of the body fluids. A strong acid…
pH: MEASURING ACIDITY AND ALKALINITY
The negative log (antilog) of hydrogen ion concentration is called pH. Hydrogen and hydroxyl ions affect the chemical reactions in the cells. Therefore, the concentrations of these ions in body…
ACIDS, BASES & SALTS
Acid An acid is a substance that releases hydrogen ions (in when dissolved in water. A hydrogen atom without its electron is only a proton. Thus an acid is a…
SI units of expressing concentration of solutions
The concentration of a solution is expressed by following methods: Percentage The volume or weight (concentration) of some solute is expressed in the percentage. For example 10 gin of sodium…
ELECTROLYTES AND NON-ELECTROLYTES
Electrolytes The substances that conduct electric current in aqueous solution are called electrolytes. Electric current decompose an electrolyte into its ions. The process of decomposition of electrolytes into its ions…