Groups 1 & 2 questions
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The document contains questions and answers related to chemistry concepts. Specifically, it discusses s-block elements, their properties like atomic radius and ionization energy, and their reactions. It also addresses concepts like conductivity, reduction potentials, diagonal relationships on the periodic table, and factors that govern crown ether ligand binding to metal ions.
Groups 1 & 2 questions
- 2. Why share questions? • There are many excellent open educational resources on the internet. • These include many videos of more-or-less traditional university lecturing. • These questions have been provided on a CC-BY basis to facilitate peer instruction.
- 3. Which is a true statement about K and Rb A. ΔH K(g) K+(g) + e- > ΔH Rb(g) Rb+(g) + e- B. Rb has more valence electrons than K C. The atomic radius of Sr is closer to Rb than K D. K has a larger atomic radius
- 4. Which is thermodynamically favourable? A. Li + e- Li- B. Li Li+ + e- C. Li- Li + e- D. Li- + e- Li2-
- 5. Which of the following components of air react with lithium metal? A. Argon B. Water Vapour C. Carbon Dioxide D. Oxygen E. Nitrogen Argon W aterVapourCarbon Dioxide Oxygen Nitrogen 0 0 000
- 6. Which of the following doesn’t conduct electricity A. NaCl (s) B. NaCl (l) C. NaCl (aq) D. Na (s) NaCl(s) NaCl(l) NaCl(aq) Na(s) 0% 0%0%0%
- 7. Given the following reduction potentials: Mg2+/Mg -2.34; Ca2+/Ca -2.87; Sr2+/Sr -2.89; Ba2+/Ba -2.90 how many of these metals will react with water ? A. 1 B. 2 C. 3 D. 4 0 000
- 8. Which pair of elements share a diagonal relationship? A. Magnesium and potassium B. Beryllium and aluminium C. Calcium and aluminium D. Lithium and sodium M agnesium and potassium Beryllium and alum inium Calcium and alum inium Lithium and sodium 0 000
- 9. What governs the strength of the binding between a crown ether ligand and a metal ion? A. Size alone B. Charge alone C. Size and charge D. Reduction potential Size alone Charge alone Size and chargeReduction potential 0 000