how to prepare for the ap computer science

Everything that exists in our universe is made up of this tiny particle called atom. The computer you are working on is made up of atom..

Atoms are infinitesimally small. Smaller than any thing we can imagine. One hydrogen atom, the smallest atom known, is approximately 5 x 10 -8 mm in diameter. To put that in perspective, it would take almost 20 million hydrogen atoms to make a line as long as this dash ' - '. The extremely small si..

. But it was the American inventor, Benjamin Franklin (1706 - 1796) who experimented with electricity and made major inroads in understanding the phenomenon. By the middle of the eighteenth century, there were machines that could generate large electrical charges. Static electricity may produce dra..

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 th..

plaster of paris is prepared by heating gypsum (CaSO 4 .2H 2 O) at 120C in rotary kilns, where it gets partially dehydrated. The temperature should be kept below 140C otherwise further dehydration will take place and the setting property of the plaster will be partially reduce..

Chemical Reactions and Equations - A physical change is one in which the shape, size, appearance or state, of a substance may alter, but its chemical composition remains same.A change in which the composition of a substance is altered is called as chemical chang..

When the rubber sheet is pulled down, the volume of the cavity increases. This brings the pressure down. Low pressure inside the jar brings the air rushing in through the tubes and inflates the balloon. To demonstrate expiration, the rubber sheet is allowed to go back to its original position...

When the rubber sheet goes back to its position, the volume in the jar is reduced and the pressure is increased. This pushes the air out of the balloon..

How Strong are Acid or Base Solutions? - The strength of an acid depends on the concentration of the hydronium ions (H 3 O + ) present in a solution. We know that greater the number of hydronium ions present, greater is the strength of acid. However, some acids do not dissociate to any ap..

An acid, which dissociates completely or almost completely in water, is classified as a strong aci..