8. The Periodic Table
A section of Chemistry, 0620
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This question is about elements in the Periodic Table. The table shows some properties of five elements, P, Q, R, S and T. element melting point / °C density in g / cm3 electrical conductivity of the solid atomic radius / nm P 0.86 very good 0.235 Q –7 3.12 does not conduct 0.114 R 1.54 very good 0.174 S 8.9 very good 0.126 T –157 0.0035 does not conduct 0.110 Use only the elements shown in the table to answer this question. State which two of the elements, P, Q, R, S and T, are covalent molecules. Give two reasons for your answer. elements and reason 1 reason 2  Describe how the metallic character of the elements depends on their position in the Periodic Table. Potassium is an element in GroupI of the Periodic Table. Cobalt is a transition element. Cobalt has a higher density than potassium. Give two other ways in which the properties of transition elements differ from the properties of GroupI elements.  State whether potassiumoxide is a basic oxide or an acidic oxide. Give a reason for your answer. The table compares the ease of reduction of four metal oxides when heated with carbon. metal oxide details of reduction chromium(oxide reduced at 1200 °C manganese(oxide reduced at 1400 °C potassium oxide not reduced at 1400 °C zinc oxide reduced at 850 °C Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Describe how aqueous sodiumhydroxide is used to test for chromium(ions, Cr3+. 
0620_s21_qp_32
THEORY
2021
Paper 3, Variant 2
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This question is about Group I and Group VII elements. Deduce the number of electrons, neutrons and protons in one atom of the isotope of potassium shown. 40K number of electrons number of neutrons number of protons  Complete the chemical equation for the reaction of potassium with water to form potassiumhydroxide and a gas which pops with a lighted splint. 2K + H2O → 2KOH +  The table shows some properties of four Group I elements. element melting point / °C boiling point / °C relative hardness lithium 5.0 sodium 0.7 potassium rubidium 0.2 Complete the table by predicting: ● the melting point of sodium ● the relative hardness of potassium. Predict the physical state of potassium at 100 °C. Give a reason for your answer. Aqueous bromine reacts with aqueous potassium iodide. Br2 + 2KI → 2KBr + I2 Explain how this equation shows that bromine is more reactive than iodine. State the colour of aqueous iodine. Bromine is a diatomic molecule. State the meaning of the term diatomic. Bromine liquid turns into a gas very easily at room temperature. Choose the word which best describes a substance that evaporates easily. Draw a circle around your chosen answer. conductor flammable malleable volatile 
0620_s22_qp_32
THEORY
2022
Paper 3, Variant 2
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This question is about GroupI and GroupVII elements. Deduce the number of electrons, neutrons and protons in one atom of the isotope of sodium shown. 23Na number of electrons number of neutrons number of protons  Sodium reacts with chlorine to produce sodium chloride. State the colour of chlorine gas. Chlorine is a diatomic molecule. State the meaning of the term diatomic. Complete the chemical equation for the reaction of sodium with chlorine. 2Na + → NaCl Sodium chloride is an ionic compound. Describe two physical properties of ionic compounds.  The table shows some properties of four GroupI elements. element melting point / °C boiling point / °C atomic radius / nm lithium 0.157 sodium potassium 0.235 rubidium 0.250 Complete the table by predicting: ● the melting point of potassium ● the atomic radius of sodium. Predict the physical state of rubidium at 700 °C. Give a reason for your answer. Give two physical properties of GroupI metals that are different from transition elements and state how they are different.  Aqueous chlorine reacts with aqueous sodium iodide. Cl 2 + 2NaI → 2NaCl + I2 Explain how this equation shows that chlorine is more reactive than iodine. 
0620_s22_qp_33
THEORY
2022
Paper 3, Variant 3
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