G ANSWER THE FOLLOWING QUESTIONS : 1. Define element and compound 2. Iron and sulphur both are elements whereas iron sulphide is a compound, explain 3. Differentiate between symbol and formula. 4. What does the following symbols illustrate ? (0) 502 (ii) 30 (iii) 203 (v) Sa (v) Ni (vi) Na 5. Write down the formulae of the following compounds : (0) Carbon dioxide (ii) Calcium oxide (iii) Water 6. Write down the chemical names of the following compounds : ON () CO2 (iii) Cao (iv) H₂O 7. Give two examples of each of the following: () Metals (iv) Compounds (vii) Natural elements (ii) Non-metals (v) Elements (viii) Diatomic gases (ii) Metalloids (vi) Radioactive elements (ix) Polyatomic molecules
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1. Elements are the simplest complete chemical substances. Each element corresponds to a single entry on the periodic table. An element is a material that consists of a single type of atom. ... A compound consists of two or more types of elements held together by covalent or ionic bonds.
2.Iron and sulfur are both elements from the periodic table of elements. ... Iron is a metal, while sulfur is a nonmetal. When these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide.
3.A chemical symbol is a one- or two-letter designation of an element. Compounds are combinations of two or more elements. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
Hope it helps you. I dont. remember these formulae and those examples sorry for that
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