19. Fill in the blanks with the correct words.
(a). The chemical symbol of sodium is derived from a _____ (Latin/Greek) word.
Therefore, the chemical symbol of sodium is derived from a Latin word.
Fill in the following blanks with suitable words :
(a) Chemical equations are balanced to satisfy the law of ..........
(b) A solution made in water in known as an .............. solution and indicated by the symbol .......
(c). Burning of wood is an example of a _________ (physical/chemical) change.
(b). We require ______ (valency/atomicity) for writing a chemical formula.
Fill in the blanks by selecting correct word/term given in the bracket.
A shorthand notation of a chemical reaction is called a chemical ___. (reaction/symbol/ equation)