Question

1. Chemical formulae for simple compounds
2. Isotopes and Isobars
3. Mole concept
4. Alloys and examples
5. Law of Definite proportions and examples.
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Answer 1

1) The symbols of the elements can be used to represent compounds e.g. FeS, NaCl, KBr and H2O. These are called chemical formulae. In the first three examples, the ratio of the elements in each compound is 1:1. ... In the last example (H2O) there are two atoms of hydrogen for every atom of oxygen in the compound.

2 ) Isotopes are atoms with the same number of protons but differing numbers of neutrons. Isobars are atoms of different chemical elements having equal values for atomic mass. Isotopes have the same atomic number. Isobars have different atomic numbers.

3 ) A mole is defined as the amount of substance containing the same number of discrete entities (atoms, molecules, ions, etc.) ... The molar mass of an element (or compound) is the mass in grams of 1 mole of that substance, a property expressed in units of grams per mole (g/mol) .

4 ) An alloy is a mixture or metallic-solid solution composed of two or more elements. Examples of alloys include materials such as brass, pewter, phosphor bronze, amalgam, and steel.

5 ) Common Examples of the Law of Definite Proportions. Water, written as the chemical compound H20, is made up of atoms of hydrogen and oxygen. If one oxygen atom is combined with two hydrogen atoms, water is created.

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