Quiz on human eye
Loading… See also-HUMAN EYE AND COLOURFUL WORLD / WONDERS OF LIGHT PART – I
Loading… See also-HUMAN EYE AND COLOURFUL WORLD / WONDERS OF LIGHT PART – I
Loading… See also-Force and Laws of Motion – Balanced and Unbalanced Force, Inertia, Types of Inertia
Loading… See also- What is Uniform and Non-uniform Motion? Give Examples.
This is an interactive activity.
As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron.
Transportation What will happen to a plant if its xylem is removed? (Delhi 2009, 1 mark) Need clues – Click here (a) Draw a sectional view of the human heart and level on it – Pulmonary arteries, vena cava, left ventricle.(b) Why is double circulation of blood necessary in human beings? (AI 2009, 5 marks) …
Previous Year’s CBSE Board Questions – Life Processes – Transportation Read More »
Some Important Carbon Compounds – Ethanol and Ethanoic acid 1. Write the name and molecular formula of an organic compound having its name suffixed with ‘-ol’ and having two carbon atoms in its molecule. Write balanced chemical equation to indicate what happens when it is heated with excess of conc. H2S04 and the name of …
Table of Contents – Need of Classification What is Periodic Table and Periodicity? Dobereiner’s Triads Newlands’ Law of Octaves
Read First – Electric Current Circuit is a continuous path consisting of conducting wires and other resistances between the terminals. Electric circuit is a continuous path made by conducting wires, devices such as resistances, capacitors etc. and voltage sources. A continuous / closed path consisting of conducting wires and other resistances between the terminals of a …
Electric Symbols and Electrical Circuits – Introduction and Quiz Read More »
We use the electric appliances like TV, refrigerator, electric motor, electric torch etc. Electricity is now an essential item in our life and we cannot imagine life without it. Every month we pay for electricity by paying electricity bill. We use many terms for electricity like voltage, current, short circuit , resistance etc. We will …
Take a few zinc granules in a conical flask. Add dilute hydrochloric acid (HCl) or sulphuric acid (H2SO4) in the conical flask. (a) What do you observe ? (b) Touch the conical flask and observe any change in its temperature ? Objective – A chemical reaction characterized by evolution of a gas and by evolving heat …
Slowly add water in a small amount of calcium oxide or quick lime containing in a conical flask. Touch the beaker. Do you feel any change in temperature ? Objective – Combination reaction with heat change. Inference – Calcium oxide (CaO) reacts vigorously with water and form a single product, calcium hydroxide (slaked lime). CaO(s) + H2O …
Take a small amount of ferrous sulphate crystals in a dry test tube. (a) Note the colour of the ferrous sulphate crystals. Heat the test tube over the flame of a burner or spirit lamp. (b) Observe the colour of the crystals after heating. Objective – To study a thermal decomposition reaction. Inference – (a) Before …
Objective– To understand a chemical reaction. Procedure – Take a magnesium ribbon. Clean it by rubbing with sand paper. (a) Why should magnesium ribbon be cleaned before burning in air ? Hold it with a pair of tongs. Burn it in the flame of a burner. Collect the ash so formed in a watch glass. Precaution …
IN A CHEMICAL REACTION, ORIGINAL SUBSTANCE LOSES ITS NATURE AND IDENTITY Read More »
Some commonly used chemistry lab apparatus are shown in the video.
Read first – What is Matter? What is its Characteristics? States of Matter Law of Conservation of Mass Problems based on Law of Conservation of Mass Law of Definite Proportions / Constant Composition Mole Concept – Importance and formulas Problem 1 : One mole of V2O5 contains 5 moles of oxygen atoms, as it is clear from …
How to solve Problems based on Law of Definite Proportions / Constant Composition Read More »
Cell – The Basic Unit of Life From the Video, you will learn – Definition Important Discoveries Cell Theory Concept Map
Procedure 1. Fix a candle in the middle of the small trough. 2. Fill the trough about half with water. 3. Place a long glass tumbler in the inverted position upon the candle. 4. Mark the level of water in the glass tumbler either by rubber band or with marker. 5. Remove the glass tumbler …
When a chemical reaction occurs, following observations help us to determine whether a chemical reaction has taken place. (1) Formation of a precipitate (2) Change in colour (3) Evolution of a gas (4) Change in state (5) Change in temperature or evolution / absorption of heat (6) Sound, light may be produced. (7) Change in …
A CHEMICAL REACTION IS CHARACTERIZED BY FORMATION OF A PRECIPITATE. Read More »