8.2. Group I properties
A subsection of Chemistry, 0620, through 8. The Periodic Table
Listing 10 of 36 questions
The Group I metals show trends in both their physical and chemical properties. How do their melting points vary down the Group? Which element in the Group has the highest density? All Group I metals react with cold water. Complete the following equation. Rb + H2O → + Lithium reacts with nitrogen to form the ionic compound, lithium nitride. State the formula of the lithium ion. …… Deduce the formula of the nitride ion. …… In all solid ionic compounds, the ions are held together in a lattice. Explain the term lattice. What is the ratio of lithium ions to nitride ions in the lattice of lithium nitride? Give a reason for your answer. lithium ions : nitride ions
0620_s12_qp_31
THEORY
2012
Paper 3, Variant 1
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The table below shows some properties of the Group I elements. metal density in g / cm3 melting point / °C boiling point / °C lithium 0.53 sodium 0.97 potassium 0.86 rubidium 1.53 caesium 1.88 Use the information in the table to explain why caesium is a liquid when the temperature is 34 °C. Suggest a value for the boiling point of potassium. °C Describe the general trend in density down the group. Which element does not follow this trend? State three physical properties of potassium, other than density, melting point and boiling point. Potassium reacts with water. The products are potassium hydroxide and hydrogen. Describe two observations when potassium reacts with water. Complete the symbol equation for this reaction. 2K + H2O → 2KOH +
0620_s13_qp_21
THEORY
2013
Paper 2, Variant 1
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Questions Discovered
36