scott foresman fourth grade science study guides

Mendeleev's Periodic table simplified the study of elements. As the arrangements of elements showing similar properties were classified into groups, it was very useful in studying and remembering the properties of a large number of elements in a systematic wa..

It is interesting to note that n/p ratio of lighter elements is around one, whereas for heavier metals it is higher. Higher the n/p ratio, more unstable is the element. That is why metals like uranium and polonium are unstable and radioacti..

Carl Linnaeus, father of modern botany, was a Swedish naturalist who laid the foundation of modern classification and nomenclature in 1758. He devised a binomial system of nomenclature (naming system) in which an organism is given two names: A generic name (name of genus) which it shares with other..

We shall now study about the exact relation between the force applied and the motion of the object on which the force is applied. This was studied by Sir Issac Newton. He gave the three basic laws of motion concerning objects in moti..

The structure of the cell that we have studied so far is that of a eukaryotic cel..

Study of the compounds of carbon is organic chemistry. They form the basis of living organisms and the things around u..

Question: Which plant did Mendel select for his studies and why? Answer: Mendel selected the purebred garden pea plant for his studies. These plants showed many contrasting traits that were easy to track through the generations.These plants are naturally self-pollinat..

Importance of Classification - By making a comparative study and assorting the similarities and differences amongst the various varieties of species, organisms can be classified into groups or sets. Taxonomy is a regular branch of science that is involved with the purpose of arr..

Introduction - You have studied in the previous chapter about refraction of light by lenses and also about the nature, position and relative size of images formed by lenses. How can these ideas help us in the study of the human eye? The human eye uses light and enables us to see..

By making a comparative study and assorting the similarities and differences amongst the various varieties of species, organisms can be classified into groups or set..