Question 4 Which of these substances are compounds? L. Neon II. Crude oil III. Water IV. Sodium chloride o I and III o II, III, and IV O III and IV O Il and IV Question 5 Which scientist is incorrectly matched with his idea or theory? Scientist Theory I. Rutherford Atoms contain a nucleus. IL Proust Law of constant composition III. Lavoisier Law of conservation of matter IV. Dalton Law of conservation of mass V. Boyle The simplest form of a substance is an element. O I. O III. O IV. O V. Question 6 Methane can be decomposed into two simpler substances: hydrogen and carbon. Therefore, methane is a(n) a mixture O clement atom compound. O molecule

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.