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CHEMISTRY FORM 2


1. STRUCTURE OF THE ATOM, AND THE PERIODIC TABLE
2. CHEMICAL FAMILIES AND PATTERNS IN PROPERTIES
3. CHEMICAL BONDING AND STRUCTURE
4. SALTS
5. EFFECT OF AN ELECTRIC CURRENT ON SUBSTANCES
6. CARBON AND SOME OF ITS COMPOUNDS
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Carbon and some of its compounds: Chemical properties of carbon

6.0 Carbon and some of its compounds


6.2 Chemical properties of carbon


6.2.1 Reaction of carbon with oxygen (pure or in air)


Set-up

high school chemistry , Burning of carbon in oxygen

Figure 6.2.1 Burning of carbon in oxygen


Observe the videos showing the burning of carbon in oxygen.


(courtesy Youtube-Combustion of Carbon in Oxygen by revisionhelper helper)

(courtesy Youtube-9. Carbon burning in air - Air and its constituents by sangguru)

(courtesy Youtube-Burning coal in pure oxygen by Felix Letkemnn)

Questions 6.2.1

  1. With what colour of flame does carbon burn in pure oxygen? Check the position of carbon in the Periodic Table.

  2. To which Group of the Periodic Table does carbon belong?

  3. Why is carbon expected to be reactive?

  4. What is the normal valency of carbon?

  5. Oxygen is in Group VI. Write the formula of expected product when carbon burns in oxygen. How can we test the product?

  6. Write the chemical equation for the burning of carbon in oxygen.


    high school chemistry , Charcoal burnt in domestic charcoal burner

    Figure 6.2.1 Charcoal burnt in domestic charcoal burner


    Caution: Cutting down of trees and burning charcoal cause serious threats to the environment and climate. We should plant trees and use solar energy, biogas or electricity if available. Although burning biogas also produdces carbon (IV) oxide, it saves trees from use as firewood.

  7. Figure 6.2.1 shows the effect of burning charcoal, an amorphous carbon, in a domestic charcoal burner. What is the evidence (reason for believing) that charcoal is not pure carbon?

  8. Are the impurities likely to be compounds of metals or non-metals? Explain (Hint: structure and physical state).


Answers to Questions 6.2.1


6.2.2 Reaction of carbon with copper (II) oxide (and other metal oxides)


Set-up


Reaction of carbon with copper (II) oxide, high school chemistry ,Chemistry

Figure 6.2.2 Reaction of carbon with copper (II) oxide


Observe the reaction between carbon and copper (II) oxide below.


(courtesy Youtube-Carbon reduction of Copper Oxide by CLEAPSS)

Questions 6.2.2

  1. Describe the observations made when a mixture of carbon and copper (II) oxide is heated and the gaseous product bubbled through calcium hydroxide solution.

  2. Name the products of the reaction.

  3. Write the equation for the reaction.

  4. The order of reactivity of elements from the highest to lowest is: K, Na, Ca, Mg, Al, C, Zn, Fe, Pb, Cu. Name any two other metal oxides you would expect to react with carbon in a similar way. Explain your answer.

  5. Write equations for the reactions between carbon and each of the two other metal oxides you have named in 4.


Answers to Questions 6.2.2


6.2.3 Reaction of carbon with concentrated sulphuric acid and nitric acid


Observe the reaction between carbon and concentrated sulphuric acid.


(courtesy Youtube-Carbon reacting with sulphuric acid by Joseph Rabari)

Questions 6.2.3

  1. For the reaction between carbon and concentrated sulphuric acid, water, sulphur (IV) oxide and carbon (IV) oxide are the products. Write the equation for the reaction.

  2. How can we show that water is produced?

  3. For the reaction with concentrated nitric acid, water, nitrogen (IV) oxide and carbon (IV) oxide are produced. Write the equation for the reaction.


Answers to Questions 6.2.3