Build an Atom / Element / Ion
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.
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.
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 »
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 »
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 »