Structure & essay Questions (periodic table of element)

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Structure & essay Questions (periodic table of element)

  1. 1. PERIODIC TABLE OF ELEMENTStructure Question1 Diagram 2.1 shows the Periodic Table of elements. The letters P, Q and U do not represent the actual symbols of the elements. 1 2 13 14 15 16 17 181 P23 Q U456 FIGURE 2.1 (a) Table 2.2 shows one characteristic for each of elements R, S and T. Element Chracteristic R Located in Period 2 and has 6 valency electrons S Has electron arrangement 2.8.8.1 T Has a duplet in the only electron shell Table 2.2 Referring to Table 2.2, indicate the positions of R, S and T by writing the letters in the correct boxes of the above Periodic Table. [3 marks] (b) Which element among P, Q, R, S, T and U, exists as a monoatomic gas?. ……………………………………….. ....................................................................... [1 mark] (c) Both Q and S react with cold water to produce hydrogen gas. (i) Which element reacts more vigorously ? ……………………………………….......................................................................... [1 mark] (ii) Write the balanced chemical equation for the reaction in c(i). …………………………………………......................................................................
  2. 2. [1 mark]d) When U dissolves in water, it produces a mixture of two acids. (i) Write the formulae for these two acids. ……………………………………………………………………………………. [1 mark] (ii) Describe the observation obtained when a piece of litmus paper is immersed in the mixture of two acids? …………………………………………………………………………………….. [1 mark]e) P can react with R to produce a liquid. Name the liquid. ………………………………………………………………………………………... [1mark]f) Classify the elements P, Q, R, S, T and U into metals and non-metals. Type of element Elements Metal Non-metal [2 marks]
  3. 3. JAWAPAN1 (a) 1 2 1 1 1 1 1 1 3 4 5 6 7 8 1 P T 2 R 3 Q U 4 S 5 1+1+1 6 (b) T 1 1 (c)(i) S 1 (ii) 2Q + 2H2O  2QOH + H2 // 2S + 2H2O  2SOH + H2 1 2 (d)(i) HU dan HUO atau HCl dan HClO/HOCl 1 (ii) Warna kertas litmus dilunturkan/biru / merah menjadi putih 1 2 (e) Air 1 1 (f) Logam: Q, S Bukan logam: P, R, T, U Catatan : Semua betul – 2 markah Mana-mana 4 betul – 1 markah 2 JUMLAH 11
  4. 4. 2. Figure 1 show a part of the periodic table. 1 2 13 14 15 16 17 1812 P Q3 R S T456 Figure 1 Based on the Figure 1, answer the following questions. (a) What is the element represented by P? ............................................................................................ (1 marks) (b) On the figure above, mark X in the box for an alkali metal ........................................................................................... (1 marks) (c) State one characteristic of element U. .......................................................................................... (1 marks) (d) Write the electron arrangement for S. ......................................................................................... (1 marks) (e) (i) Which element is not chemically reactive? .................................................................................. (1 marks) (ii)State one application of the element in (e)(i) ................................................................................. (1 marks) (f) (i) Write the chemical equation for the reaction between R and Q ................................................................................. (1 marks) (ii)State briefly the transfer of electron which occur during the reaction between R and Q. .......................................................................................... ......................................................................................... (2 marks)JAWAPAN1 (a) Carbon 1 (b) (any box in column for group 1) 1 (c) Form coloured compounds 1 (d) 2.8.7 1 (e) (i) T 1 (ii) Fill electric bulb 1 (f) (i) 2R + Q2 2RQ 1 (ii) - R release two electrons to Q 1 - Q receive two electron from R 1 9
  5. 5. ESSAY QUESTION 1 (a) Figure below shows the positions of elements Na, P and Cl in the Periodic Table of Elements. 1 2 13 14 15 16 17 18123 Na P Cl456 i. Arrange the element, Na, P and Cl according to the size of the atoms that decrease. Explain your answer. (5 marks) ii. Arrange the elements Na, P and Cl following their increasing electronegativity. (4 marks) iii. State two chemical properties of sodium. Show the reaction involved. (7 marks) (b) “Iron is a transitional element.” State the properties that support the above statement. (4 marks)JAWAPAN1 (a) (i) - Na, P, Cl Decreasing in the size of the atom 1 - Every atom of the element Na, P and Cl have 3 shell with 1 electrons. - The nuclear positive charge increase as the period moves from left across to the right period. 1 - Therefore the pulling force of the nucleus on the electrons of the three shells become stronger from
  6. 6. Na, P and Cl. 1 - Because of this, the size of the atom decrease from Na, P to Cl. 1 (ii) - Na,P,Cl Increasing electronegativity 1 - The nuclear positive charge increase from Na to Cl. 1 - The sizeof the atom becomes smaller from Na to Cl. 1 - Because of its strength, the nucleus can attract more electrons by Na to Cl. 1 (iii) 1.Reaction with water - Sodium react actively with water and produces a loud pop sound. 1 - A solution which turns red litmus paper blue is produced. 1 - Equation of the reaction : 2Na + 2H2O  2NaOH + H 1 2. Reaction with oxygen - Sodium burns quickly with a bright yellow flame. 1 - A white solid is produced and dissolves in water. The solution turns red litmus blue. 1 - Equation of the reaction : 4Na + O2 2Na2O 1 Na2O + H2O  2NaOH 1(b) - Iron forms a coloured compound e.g. ferric(III) chloride, which is reddish brown in colour. 1 - Iron has different oxidation number. 1 Example: The oxidation number of iron in ferrous(II) chloride is +2 while in ferric(III) chloride is +3. 1 - Iron can form complex ions e.g. ion [Fe(CN)6]4- 1 20

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