Properties of covalent compounds

Question 1 Give few properties of covalent compounds? Properties of covalent compounds 1)Covalent compounds exist as single molecules which are mostly in gaseous state(hydrogen,oxygen, ammonia).Some of them may be liquid(bromine) and few as solids(iodine, phosphorus) 2)Covalent compounds have usually low melting and boiling point.Since no ions are present in the covalent molecules. 3)Covalent compounds are…

Examples of covalent molecules

Question 1 Show covalent bonding in hydrogen molecule? Question 2 Show covalent bonding in oxygen molecule? Question 3 Show covalent bonding in nitrogen molecule? Examples of covalent molecules 1)Hydrogen molecule The atomic number of hydrogen is 1.It has 1 electron in its outermost shell.It needs 1 more electron to complete its shell.Therefore H atom shares…

Covalent bonding

Question 1 What is covalent bonding? Question 2 What are covalent molecules? Question 3 What is single covalent bond? Question 4 What is double covalent bond? Question 5 What is triple covalent bond? Question 6 Define the term covalency? Question 7 What are monovalent molecules.Give example? Question 8 What are divalent molecules.Give example? Question 9…

Carbon

Question 1 What is the atomic number of carbon? Question 2 What is the mass number of carbon? Question 3 What is the electronic configuration 0f carbon? Question 4 Why carbon cannot lose 4 electrons? Question 5 Why carbon cannot gain 4 electrons? Question 6 Why is carbon atom tetravalent in nature? Question 7 Why…

Transportation in plants

Question 1 Name the two conducting tissues of plants? Question 2 What is the function of transpiration? Question 3 What is transpiration? Question 4 Name the two kinds of cells of xylem? Question 5 Name the various cells through which water moves upwards to reach the leaves? Question 6 What is translocation? Question 7 How…

Blood clotting and lymphatic system

Question 1 What is the other term for extracellular fluid? Question 2 What is clotting of blood? Question 3 Write a flow chart showing major events taking place in clotting of blood? Question 4 What are the two major functions of lymph? Question 5 What is lymph? Question 6 What is thromboplastin? Question 7 What…

Heart

Question 1 Name the largest artery in our body? Question 2 What is the meaning of double circulation? Question 3 Explain the double circulation of blood in human heart? Question 4 Describe the structure and function of human heart? Question 5 What is cardiac cycle? Question 6 Define the term systole? Question 7 Define the…

Life processes

Question 1 Define the term life process? Question 2 Define respiration? Question 3 Define nutrition? Question 4 Define transport? Question 5 Define excretion? Question 6 Define the term reproduction? Question 7 Define the term growth? Life Processes The basic function performed by living organism to maintain their life are called life processes. The basic life…

Lenses

Question 1 Define optical centre? Question 2 Define principal focus? Question 3 Define focal length? Question 4 Define principal foci? Question 5 Define first focal plane? Question 6 Define first principal focus? Question 7 Define second principal focus? Question 8 What do you mean by aperture of lens? Question 9 What are converging lenses? Question 10 what…

Refraction by spherical lenses

Question 1 What is a lens? Question 2 How many type of lens are them? Question 3 What is a convex lens? Question 4 What is a concave lens? Question 5 Draw Bi-convex,plane-convex and concavo-convex lens? Question 6 Draw Bi-concave,plane-concave and convexo-concave lens? Refraction by spherical lenses Lens is a transparent medium bounded by two…

Refraction of light

Question 1 Define the term refraction of light? Question 2 Draw a diagram showing the bending of a ray of light when it travels from a rare medium to a denser medium? Question 3 State two laws of refraction? Question 4 What is the cause of refraction of light? Refraction of light The phenomenon of…

Images formed by Concave lens

Question 1 What are the sign conventions for measuring the distances for spherical lens? Question 2 The image formed by concave lens is seen to be virtual,erect and highly diminished than the object.What is the position of the object? Question 3 Where should an object be placed in front of a concave lens so as to obtain…

Images formed by convex lens

Question 1 Where should an object be placed in front of a convex lens so as to obtain image on same side of lens? Question 2 The image formed by convex lens is seen to be real,inverted and diminished.What is the position of the object? Question 3 The image formed by convex lens is seen to be real,inverted…

Refraction through a glass slab

Question 1 What is meant by lateral shift? Question 2 The refractive index of dense flint glass is 1.65 and for alcohol it is 1.36,with respect to air.What is the refractive index of the dense flint glass with respect to alcohol? Question 3 Draw a diagram showing refraction of light through a glass slab? Refraction…

Light-Reflection

Question 1 What are luminous objects.Give example? Question 2 What are non-luminous objects.Give example? Question 3 State the laws of reflection? Question 4 What is beam of light? Question 5 Define the term reflection of light? Question 6 What is a real image? Question 7 What is a virtual image? Question 8 Write the properties…

Metals

Question 1 Name one metal which has a low melting point? Question 2 Name two metals which are malleable and ductile? Question 3 Name one soft metal that can be cut with knife? Question 4 Name the metal which is the poorest conductor of heat? Question 5 Why copper and aluminium metals are used for…

Work

Question 1 Calculate the work done in lifting 200kg of water through a vertical height of 6 m? Question 2 Define the term work? Question 3 What is the S.I. unit of work? Question 4 Is work a scalar or a vector quantity? Question 5 Define 1 joule of work? Question 6 What are the…

Electrical energy and power

Question 1 Define the term electrical energy? Question 2 Define the term electric  power? Question 3 What is the SI unit of power? Question 4 What is the commercial unit of KWh? Electrical energy The work done by a source of electricity to maintain a current in an electrical circuit is called as electrical energy….