Reactions and compounds. New substances are formed by chemical reactions. When elements react together to form compounds their atoms join to other atoms using chemical bonds. For example, iron and sulfur react together to form a compound called iron sulfide.Mixture of iron (grey) and sulfur (yellow) powders.hen elements react, their atoms join with other atoms to form compounds [compound: A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. ] . Chemical bonds form when this happens, which involves atoms transferring or sharing electrons.
The 'red land' was the barren desert that protected Egypt on two sides. These deserts separated ancient Egypt from neighbouring countries and invading armies. They also provided the ancient Egyptians with a source for precious metals and semi-precious stones.
About three dozen species of snakes live in Egypt, quite a few of them highly poisonous but most harmless to humans. They populate all possible environments, from the sandy desert to the marshy Nile delta.The attitude of the Egyptians towards them has always been ambivalent.trabo mentions a number of Egyptian animals in his writings and was especially impressed by the snakes: The animals peculiar to the country (i.e. Egypt) are the ichneumon and the Egyptian asp, having some properties which those in other places do not possess.