accuracy and precision in chemistry

When dealing with objects that can be counted, one can always get an exact answer. But while measuring the weight of a person, the volume of milk in a container, the length of a cloth etc. it is not possible to measure them exactly. The difference in the two situations arises because objects are me..

Suppose three students A, B and C measure the volume of the liquid in a cylinder. They report the following values: Result of A: 23.4 mL; Result of B= 23.5 mL; Result of C= 23.6 mL If the correct volume of the liquid is 23.5 mL, it means that the student B has measured the volume of the liquid cor..

Uncertainty Principle - It is not possible to measure simultaneously both the position and velocity (or momentum) of a microscopic particle with absolute accuracy or certaint..

Although the Lewis structures give an idea of the valence electrons around the atom, in reality it does not precisely locate the position of the electrons in the chemical bond. The behaviour of electrons in molecules and compounds is made by the valence bond theory in terms of the q..

The development of chemistry is based upon the systematic approach of the scientists in carrying out different experiments. Scientific theories, inferences and generalizations are made on the observations recorded. The quantitative information involves the measurement of one or more..

All moving objects in our daily life have well defined paths or trajectories. The path or trajectory of an object can be determined by knowing its position and velocity at various intervals of time. However, Werner Heisenberg, in 1927, pointed out that we can never measure accurately both the..

It is used as solvent in paints, varnishes and lacquers It is used as delusterant (removes the lustre from a textile) for cellulose acetate fibres It is used in the preparation of cordite (smokeless gun powder) and plexiglass (unbreakable glass) It is used for specification testi..

The unusual brilliant shine of diamond makes it an invaluable precious stone in jewellery. Making high precision cutting tools for use in medical field. Because of it's hardness it is used in manufacturing tools/cutting drills for cutting glass and rock. In making dyes for draw..

When addition or subtraction is to be carried out in the numbers having different precisions, the final result should be reported up-to the same number of decimal places as are present in the term having the least number of decimal places. Addition of numbers In the addition of 42.2 ..

Physical Quantities and their Measurement - The development of chemistry is based upon the systematic approach of the scientists in carrying out different experiments. Scientific theories, inferences and generalizations are made on the observations recorded. The quantitative information i..