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Dubai

Grade 8

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Published in: Chemistry
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Notes for Grade 8 Chemistry CBSE

Sabah A / Sharjah

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Qualification: 12th

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  1. METALS AND NON METALS REFERENCE MATERIAL CHEMICAL PROPERTIES OF METALS AND NON-METALS Reaction with oxygen (02) Metals Metals react with 02 and produces metallic oxide. METAL + OXYGEN Metal oxides magnesium burns with a dazzling white flame and form magnesium oxide. 2Mg+02 2Mgo ex: 2 Sodium reacts vigorously with oxygen to form sodium oxide. 4Na+02 2N•azo Sodium and Potassium are highly reactive metals They react vigorously with the oxygen and catch fire. on-metals Non-metals also react with 02 and produces non metallic oxide NONMETALS + OXYGEN *NON- METALLIC OXIDE Ex: 1 S+02 * S02 (Suphur dioxide is a pungent, suffocating gas) Ex: 2 C+02 *C02
  2. To prevent this they are kept immersed in kerosene. QUESTIONS BASED ON REACTION OF METALS and NONMETALS WITH AIR: 1. 2. 3. 4. 5. 6. How does magnesium burn in air? Give the chemical equation. Write the word equation and chemical equation for reaction of magnesium with oxygen. Give reason why sodium and potassium are kept immersed in kerosene? How does sodium react with air? Write the chemical equation. What is formed when the following non-metals react with oxygen. ( Write the chemical equation for the reaction) (a) Carbon (b) Sulphur COMPLETE THE EQUATIONS : I. 4 02 2. S + 02 . Nature of Oxides Metallic oxides are basic in nature. (turn red litmus to blue) Non-metallic oxides are acidic in nature. (turn blue litmus to red) 1. What is the nature of metallic oxide? ( acidic/basic/neutral) 2. Which of the following elements form acidic oxides? (a) Carbon (b) magnesium (c) Sulphur (d) Zinc (e) Iron
  3. Reaction with water Metals react with water and produces metal hydroxide and hydrogen gas. Metal + water Metal hydroxide + hydrogen gas Metals such as COPPER, SILVER & GOLD do not react with water . Non-metals do not react with water. Questions based on reaction of metals with Water: 1. 2Na + 2H20 -->2NaOH+ REACTIVITY SERIES/ACTIVITY SERIES he reactivity series is the arrangement of metals in the decreasing order of their activity
  4. Reactivity Series Potassium Sodium Calcium Magnesium Aluminium Zinc Iron Lead (Hydrogen) Copper Mercury Silver Gold Please Stop Calling Me Zebra Like Her Calling Me Smart Genius LSPLACEMENT CHON Displacement reaction is a reaction in which a more reactive METAL displaces a less reactive METAL from its salt solution.
  5. CTIVITY: REACTION OF IRON NAIL WITH COPPER SULPHATE SOLUTION Be fore en iron nails are kept dipped in copper sulphate solution for about 30 minutes, the blue colour of copper ulphate would slowly fade to become green and a brown deposition would be seen on the iron nails. y does this happen? t ha ens because iron is more reactive than co er so iron dis laces co er from co ersul hate solution.
  6. Fe + cuS04 FeS04 cu Blue Green . Give reason silver cannot displace magnesium from its salt solution. . What do you men by activity ser'es of metals? What do you observe when an iron nail is dipped in copper sulphate solution? Why isthere a change in colour 3. of the original solution. 4. Why does the color of copper sulphate change when an iron nail is kept in it? Justify your answer _ Complete the following equation 5. Ag + cusoa 6. zn + cusoa 7. zn + H2S04 8. Fe + cuso, 9. Al + ZnS04 10. cu+

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