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Lead monoxide + Nitrogen dioxide + Oxygen PbO + NO 2 + O 2 The number of oxygen atoms on the reactant side is (3 x 2 = 6) an even number, where as, on the product side (1+ 2 + 2 = 5) it is an odd number. Make it into an even number, by adding 2 in front of PbO. (Remember, we cannot place 2 between ..

If the resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of all the individual resistances. This result can be generalised for any n resistors. From the above derivations we find that if we want to increase the resis..

Once, a very beautiful actress met the famous English playwright, George Bernard Shaw. She wanted to propose to him and whispered, "Will it not be wonderful if our child has my beauty and your brains?" To this Bernard Shaw retorted, "What if the child has your brains and my looks!" What ..

Introduction - Once, a very beautiful actress met the famous English playwright, George Bernard Shaw. She wanted to propose to him and whispered, "Will it not be wonderful if our child has my beauty and your brains?" To this Bernard Shaw retorted, "What if the child has your brains and my..

Atoms and Molecules - Atoms And Molecules From the earliest times, man has always wondered about the ultimate nature of matter. He has searched to establish the basic constituents of all the substances. However, earlier efforts were more in the nature of speculations and not based on scientific inv..

Structure of Atom - When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'. Just how small these atoms are can be made out if you realize that there are ab..

Danielle wants to attend dance and music classes after school. There are 4 dance teachers and 9 music teachers available to choose. How many different choices are available for Danielle to choose the two teachers? => 4 or 9 or 36 or 37..

A teacher wants 4 of her 10 students to write a skill test. In how many ways can she select 4 students? => 210 or 220 or 215 or 205..

A teacher wanted to find out which sport the students like the most to play. What can she do to find that out? => She can ask them for their favorite sport. or She can ask each one of her students if he/she likes soccer or baseball. or She can ask them to play their favorite spo..

Tony wants to build a model of a dinosaur for his science project. The actual length of the dinosaur from head to tail is 42 feet. The length of the model dinosaur he wants to build is 7 feet. Find the actual length of the tail of the dinosaur, if the length of the tai..