(b) Write the balanced chemical equation in which the following change has been taken place (2 marks)
(i)
Change in color
Formation of precipitate
(Do not copy the example from the above question)
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B3. a) What is a chemical equation? What is the difference between the unbalanced reaction and balanced reaction? Explain with the 4 examples. The examples should be from the different type of the reaction. Name the reactant and product also.
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(a) Write the symbol of all the elements with valency from the periodic table. (1.5 marks)
(b) Which of these contains the greatest number of neutrons, the least number of electrons and the equal number of electrons and neutrons? (1.5 marks) (c) Write the electronic configuration of all the elements given in the above table.(2.5 marks)
(d) What are common in between R and 0? (1.5 marks)
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A9. The five elements P, 0, R, S, T atomic number and mass number are given below in the table.
Element Atomic Mass number number 3 7
0 16 32 R 8 16 S 9 19 T 35 80
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C4. Hydrogen iodide and oxygen reacts and form the products. If oxygen gas reacts at a rate of 0.0042 mol/L.s.
(a) Express the rate of reaction . (2 marks)
(b) What is the rate of formation of products and rate of disappearance of hydrogen iodide? (3 marks)
(c) The temperature of the reactant increases but the volume of the oxygen decreases and at the same time the concentration of the product decreases. What happens to the rate of reaction? Explain your answer. (2 marks)
D9. The atoms and ions with proton and neutron number are given below in the table.
Atom/ Ions
Number of protons Number of Heutrons
(a) Draw the electron dot diagram of the atoms and ions (lmark)
(b) Element E and G combine together to achieve the noble gas configuration. Now they achieve the noble gas configuration? Explain in detail. (3 marks) (c) Which atom or ion can form the chemical bond by combining itself? Explain the bonding in them.(3 marks)
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E4. Answer the following questions from the given solubility curve.
too so " 5so .. I 00 e 40 I30 10 00
10 10 30 40 00 00 70 Toreware CC)
00 00 400
(a) How much water is needed to dissolve 46.6 g of KCIO1 at 70°C? (1 mark)
(b) Explain the different types of solutions based on solubility.(Use K2Cr207as an example? (2 marks)
(c) Which solute would give a deposit of 40g if a saturated solution in 100g of water at 90°C was ecnipd to 50°C? (1 mark)
(d) What relationship exists between solubility and temperature in the ionic compound? Mention the exceptional ionic compound and explain the relationship of solubility and temperature in the exceptional ionic compound. (3 marks)